Why Do People Still Use Copper SFP Transceivers?


Electric sfp Introduction

In the age of fiber optics and lightning-fast data transfer, it might come as a surprise that copper SFP (Small Form-factor Pluggable) transceivers are still widely used. In this blog post, we will discuss why copper SFPs continue to hold their ground in the networking world, as well as their advantages and disadvantages compared to their optical counterparts. We will also help you understand how to choose the right copper SFP for your needs.

What is Copper SFP?

Copper SFPs are transceiver modules that support data transmission over copper cables, such as Cat5e or Cat6, using RJ45 connectors. They are commonly used in applications where short distances and lower costs are priorities, like data centers and local area networks (LANs). Two popular copper SFP options are SFP-10G-T (10 Gigabit Ethernet) and 1000BASE-T (1 Gigabit Ethernet), while other notable variants include SFP-10G-T-S, SFP-1G-T, and QSFPTEK transceivers.

SFP+ RJ45 copper

How Does the RJ45 SFP Transceiver Work?

An RJ45 SFP transceiver is a hot-swappable module that plugs into the SFP port of a network device, such as a switch or router. The transceiver receives electrical signals from the device and converts them into a format suitable for transmission over copper cables. On the receiving end, another transceiver converts the signals back into electrical form, allowing the data to be interpreted by the receiving device.

These transceivers support various data rates and standards, such as 1000BASE-T (1 Gigabit Ethernet) and 10GBASE-T (10 Gigabit Ethernet), and are compatible with a wide range of network devices. The use of copper cables with RJ45 connectors makes copper SFPs an attractive choice for short-range applications, as they are cost-effective and easy to install.

What is the Difference Between Optic SFP and Copper SFP?

Optical SFPs and copper SFPs both serve the same purpose: to facilitate data transmission between network devices. However, they differ in their underlying technology and the types of cables they use. Here are the main differences between the two:

  1. Transmission Medium: Optical SFPs use fiber optic cables for data transmission, while copper SFPs use copper cables.
  2. Distance: Optical SFPs can transmit data over much longer distances than copper SFPs, often spanning several kilometers, while copper SFPs are limited to shorter distances, typically around 100 meters.
  3. Data Rate: Both types of SFPs support a range of data rates, but optical SFPs generally offer higher speeds than copper SFPs.
  4. Cost: Copper SFPs and their associated cabling are typically less expensive than optical SFPs and fiber optic cables, making them more attractive for short-range applications.
  5. Signal Interference: Copper cables are more susceptible to electromagnetic interference (EMI) and signal degradation compared to fiber optic cables, which can lead to reduced performance over longer distances.

How to Choose Copper SFP and SFP+?

When choosing a copper SFP or SFP+ transceiver, consider the following factors:

  1. Compatibility: Ensure that the transceiver is compatible with your network devices and supports the desired data rate and Ethernet standard.
  2. Distance: Determine the maximum distance between your network devices and choose a copper SFP with a range that meets your requirements. Remember that copper SFPs are best suited for short-range applications.
  3. Data Rate: Select a copper SFP that supports the required data rate,such as 1 Gigabit Ethernet (1000BASE-T) or 10 Gigabit Ethernet (SFP-10G-T).
  1. Cable Type: Choose a copper SFP that is compatible with the type of copper cable you will be using, such as Cat5e or Cat6.
  2. Vendor: Opt for a reputable vendor, like QSFPTEK, that offers high-quality transceivers and provides good customer support.
  3. Budget: Copper SFPs are generally more cost-effective than optical SFPs, but prices can still vary. Consider your budget when selecting a copper SFP, but don’t compromise on quality for the sake of saving a few dollars.
  4. Power Consumption: Copper SFPs typically consume more power than optical SFPs, so factor in power consumption when making your choice.


Copper SFP transceivers continue to be popular due to their cost-effectiveness, ease of installation, and compatibility with a wide range of network devices. When choosing a copper SFP or SFP+, be sure to consider compatibility, distance, data rate, cable type, vendor, budget, and power consumption. By carefully weighing these factors and selecting the right copper SFP for your needs, you can build a reliable and cost-effective network solution that meets your requirements.




QSFPTEK is one of the top high-tech companies that provide innovative telecom services to its customers. QSFPTEK is a certified company that offers high-quality technical products that are well developed which have passed through multiple processes to ensure that they are well produced. QSFPTEK ensures it gives 100 % feedback to its customers and keeps constant contact with them with knowledgeable, highly skilled expertise. The dedicated team is in the progress of meeting the customer’s expectations. QSFPTEK delivers its services to customers worldwide through free shipping, and all of their telecom solutions have a warranty assurance. Through the help of our team, who works at our factory using the latest technologies and quality laboratory, we have successfully managed to satisfy thousands of our customers with the required optical products at an affordable price since we always put our customers to be the center of our focus.

QSFPTEK’s warehouse

Products that QSFPTEK offers

Having successfully looked at what is QSFPTEK lets us know some of the products that our QSFPTEK company offers to our customers. After looking at these products, we will then discuss some of the modules that QSFPTEK manufactures. QSFPTEK company offers media converters, mux, optic cables, demux, and fiber, ensuring that they fully meet your expectations by serving as your telecom solutions.

We produce media converters used in data centers, healthcare services, telecom places, and other sites. QSFPTEK media converters are of high quality and are made by skilled, dedicated expertise, and they ensure before delivering, they are tested; therefore, if you are looking for media best media converters to put together a network and you need product help, feel free and contact our QSFPTEK team or visit our website that I will earnestly provide at the end of this article.

The transceiver QSFPTEK offers

Modules that QSFPTEK company offers

Some of the modules that QSFPTEK produces are SFP, COPPER SFP,40G Transceiver, GBIC, SFP BIDII, XENPAK, neo photonics, WTD, and other 100 plus optical modules that are issued with a warranty of 3 years in case of any quality-related issue. Currently, at our factory, we have managed to produce QSFPTEK QT- SFP 10G-T module.

In this article, we will look at three modules: SFP, copper SFP, and the current module, the QT-SFP 10G-T module.


Before we briefly describe SFPs transceivers, let us first know what this acronym stands for. SFPs mean small form-factor, and these transceivers are network equipment’s break the confusion between SFP transceivers SFP module, it is worth noting that they are the same. To mention, their descriptions are small, have transmitters, and are hot-pluggable. One can use these transceivers from our QSFPTEK company for network applications either individually or in the industry. The power dissipation of these transceivers is low and can support various types of cables. These SFPs can be installed in the network system without a need of either shutting them down or restarting because of their nature of being hot-pluggable. To know which type of SFPs transceiver is the best for you, first, you have to know the different categories of these modules. They are categorized into the application, cable type, transfer rate, transmission range, and the reliable connection between any two devices.

Relative link: Are Modern Third-Party SFP 10g lr Transceivers As Good As Their OEM Counterparts?

Copper SFP

QSFPTEK manufactures copper SFP. Copper SFP in our industry is under the small form- pluggable. This copper SFP module can cover a max cable distance of about 100m. Therefore, these modules from Copper SFPs are best at short-range applications. However, Copper SFPs transceivers are costly. This module is used in hot plugging applications. Copper SFP from QSFPTEK company is produced in a way that contributes to high performance, has a compact design feature, and consumes low power. It is quite essential to note that QSFPTEK company produces copper SFP modules of different speed rates. If you have any inquiries concerning our Copper SFP modules, kindly contact us, and you will be given 100% feedback.


This is our latest series from our QSFPTEK company. This module is less costly and has made as to be highly competitive in this industry. The overview of this module is that it is delivered by our company in a branded white box only. Outside its box, you can discover some CE and FCC markings. At the back of the white branded box, you will see the factory where this module was manufactured. The modules come with nice labels that are easier to identify.

Why choose QSFPTEK company

As a way of conclusion, it is affirmatively to note why our QSFPTEK company is the best compared to others in this industry of high-tech solutions. One of the most competitive advantages that we as QSFPTEK are proud of is the availability of a large factory which has all necessities needed in this industry factory further has a modern laboratory that helps us to test all the products that we produce in a line of ensuring that they are of high quality. Besides this, our QSFPTEK company has knowledgeable, professionally skilled, and dedicated experts who have over ten years of experience in this industry and are well equipped with all the latest tools required to produce Telcom solutions. In this way, we have managed to meet the expectations of thousands of our customers globally.

We distribute our services through free shipping, and our products must first pass-through testing before we deliver. Upon delivery, we issue a three years warranty to our customers for product quality issues. QSFPTEK costs are lower because we have orders of high volume as well as mass production. Some of the resumes we get from our customers are good because we always make sure we serve them according to their will, which has made QSFPTEK company remain competitive and top-notch compared to others. These are why we should choose our company, and we will meet all your interest in Telcom solutions.

For more about our QSFPTEK, you can always contact us through sales@qsfptek.com, and we will give you direct and instant feedback.

Which Qsfp28 Transceiver Should You Choose And Why?


For any network engineer who wants to create a high-performance 100G network, the qsfp28 transceiver has become indispensable. The versatility of a 100g qsfp28 makes it a no-brainer because it complies with the 100Gbps ethernet standard as well as InfiniBand EDR specification. The qsfp 100g transceiver also works with devices from various manufacturers like Huawei, Cisco, and HPE. Let’s now break down the reasons why the 100g qsfp28 is now the go-to for people looking for low-powered, small-footprint transceivers.

Qsfp28 Transceiver Types And Supported Standards

There have been many challenges that have faced developers of high-speed 100G transceivers. This has led to many great devices gaining popularity and shortly afterward fading away because of the inability to meet certain industry requirements. However, the qsfp28 transceiver has become a constant feature of high-speed 100G networks. This is partly due to its numerous use cases, small form factor, and acceptable power requirements.

The 100g qsfp28 transceiver family is huge and one of the features that distinguish various iterations is transmission mode. There are broadly four categories including single-mode, multi-mode transceivers, active optical cable (AOC) and direct attach cable (DAC). Amongst the affordable connectivity options is multi-mode, Active Optical Cable, and DAC transceivers. However, this comes at a cost of transmission distance because they are only good up to 100 meters. Single-mode cables are costlier but can move data much further as can be seen in deployments using qsfp 100g er4 s.

There are as well many versions of the 100g qsfp28 transceiver module as we shall now find out.

The common types of qsfp28(including sr4,lr4,er4,zr4)
The common types of qsfp28

Short- to medium-haul qsfp28 transceiver types

Qsfp 100g sr4: Back To Basics

This is not a single brand but rather a networking standard developed by IEEE. The 100Ggbase sr4 transceiver makes use of 8 fibers in multi-mode configuration for transmitting data bi-directionally over the 850nm spectrum. The 100g qsfp28 sr4 can transmit data up to 70 meters over the OM3 interface and up to 100 meters OM4 when the selected interface is MTP. The ideal connectivity solution for these modules is 12-fiber OM3/4 cables using MTP.

Qsfp 100g lr4: Going The Distance

The distance challenge has always existed when it comes to networking capabilities. To improve over the previous transceiver model, the IEEE published the 100G qsfp28 lr4 standard. This iteration is primarily concerned with increasing the range of transmission beyond 100 meters and it is rated for up to a 10-kilometer transmission distance. It achieves this with the fiber optic link in single-mode. To achieve this the 100gbase lr4 uses four wavelengths in the 1310nm range to transmit data. It also uses WDM as well as a duplex LC interface to increase transmission efficiency.

Intermediate-range qsfp28 transceiver modules

Apart from the above-mentioned modules, there are several other transceivers ideal for short-distance deployments. One noteworthy module is the 100G qsfp28 DAC which is the most cost-effective option for deployments not exceeding 5 meters. This module has two main direct attach cables including qsfp28 to sfp28 DAC and qsfp28 to qsfp28 DAC.

For slightly longer transmission, the 100g qsfp28 psm4 can move data up to 500 meters with single-mode fiber using the MTP interface. The benefit of this module is that it is a lot more affordable compared to the 100G base lr4 module. For transferring data up to 2 kilometers, the 100g qsfp28 cwdm4 is ideal.

Long-haul Qsfp28 Transceiver Options

Many companies require to transmit data over very long distances. Two mainstream transceivers can fulfill these requirements. The first one is the qsfp28 er4 which uses single-mode fiber to transmit data up to 30 kilometers. When coupled with FEC it can send data over 40 km with normal LC connectors.

The second alternative is the very long-distance qsfp28 zr4 which uses single-mode fiber as well. This module is equipped with a duplex LC connector and transmits over the 1310 nm wavelength. Its transmission distance can reach to 80km.

ApplicationData CenterData CenterDCIDCI、Metro

Factors to consider when choosing qsfp28 transceiver

For a while now, the gold standard for 100-gigabit ethernet connectivity is the qsfp28 transceiver. However, several modules comply with this standard. So, which product should a network engineer use for their particular deployment? To answer that, several factors come into play as we shall now delve into.

Cabling Distance

When the transmission distance is short (below 5 meters), a network can be easily served with a passive direct attach cable. These include qsfp28 to 4xsfp28 as well as qsfp28-qsfp28 direct attach cables. Due to the short transmission distance, these DAC’s comfortably do the job of 100g optical modules without sacrificing performance. As an added benefit, the DAC option comes in cheaper than the optical 100g qsfp28 transceiver. The passive qsfp28 DAC cables are excellent for distances between 1 and 5 meters.

QSFP28 to SFP28 passive DAC | QSFPTEK
QSFP28 to SFP28 passive DAC | QSFPTEK

Multi-mode Cables Between Switches

For 100-gigabit ethernet networks using multi-mode fiber to connect switches, there are two possibilities. The first option is suitable for cables running between 3 and 20 meters and it is the qsfp28 active optical cable. The second possibility is the 100g qsfp28 sr4 optical module attached to a 12-pin patch cord with either OM3/4 interface. In this type of setup, data can be transmitted up to 100 meters.

Single-mode Cables Between Switches

Transmission distance is the single biggest differentiator between various 100g qsfp28 modules. The intermediate distance of between 100m and 2km is most relevant for large data centers. At this distance, cost-effectiveness is key and that is where the qsfp28 CRL4/CWDM4, as well as qsfp28 psm4 modules, come into play. Under 500 meters, the best option is the PSM4 when coupled with 8 single-mode cables in parallel. To reach two kilometers, the CRL4 coupled with single-mode optic cable strikes the perfect balance between performance and cost while maintaining high reliability.


Long-distance Single Mode Optic Fiber

To create even longer 100G connections, a more capable qsfp28 transceiver is required. According to IEEE standards, the ideal transceiver for the job is the 100gbase-lr4 module that has an LC interface. This setup is suitable for networks spanning up to 10 kilometers.

Despite the numerous types of transceiver modules for short- to long-haul Ethernet networks, optical fiber cables are indispensable. High-speed cables are ideal to save cost for shorter distances but optical cables reign supreme for longer distances. QSFPTEK can offer all the above types of 100g transceivers. If you have any questions about transceivers, you can always get in touch with QSFPTEK.Inc staff via sales@qsfptek.com.

All the things you should know about SFP Transceiver


SFP optical module is a short term for small form-factor pluggable, it is a small compact, a pluggable device that helps with the connection of and its interfaces between cable and networking equipment. It helps in customizing the user’s networking equipment since these are available with a specification to help the users meet their specific needs.

The development of optical modules
The development of optical modules

Why does SFP is also known as miniGBIC? The GBIC is the term for Gigabit Interface Converter, it was called miniGBIC, because GBIC is larger than SFP, so it was called miniGBIC. However, since GBIC is quite larger and bigger and still works with the same purpose, it was replaced by SFP in most applications today.

Remember that gigabit ethernet sfp comes with a lucent connector while GBIC comes with the standard connector, both of them are fiber-optic but they are differentiated based on their sizes.

According to the market, there are lots of SFP transceivers and SFP cables, so you should know what is best for you. You can choose if between single-mode or multi-mode, depending on the type that you need since, it helps in transmitting the data anywhere in the world. It provides a transfer rate of 500m as far as 70km to 80km, with a speed of 10 Mbps up to 40 Gbs. As you can see that’s efficient for the users who want to have a faster speed of connections.

The first thing that the users need to see is how far the distance is, considering it will make them choose if they need a Short Reach sfp fiber optics or the Long Reach sfp fiber optics.  If you want a cheaper option, you can probably choose SFP for shorter a distance. Always put in mind that before the users purchase the products, they should know what material do they need and be compatible with the equipment.

How do Single-Mode fiber optic cable and Multi-Mode fiber cable differ? They both have a core but differ in size and wavelength. Not just that, when it comes to fiber optic patches don’t, they have similar color, Single-mode cable has a yellow cord while the Multi-mode cable has an aqua green cord.

The SMF and MMF LC Duplex fiber cable
The SMF and MMF LC Duplex fiber cable

What are the things to consider in checking with SMF and MMF SFPs? First, ensure that both ends of the fiber patch cord have the same wavelength, with consistent color modules. Upon choosing the SFP module, make sure that you confirm the transmission distance and wavelength. Always remember that bending the fiber optic will result to increase attenuation. Lastly, keep on track with the prices check and verify correct cost as the cost for it keep increasing over overtime.

The achievable network speed today is 10G speed with the help of an SFP optic. Let’s look at some of the standard SFP optics in today’s world.

1000BASE-T SFP: It is the SFP transceiver which is the RJ-45 version. We also call the rj45 sfp module. It operates up to 100m distances, on standard CAT 5 UPT copper cable link length.

1000BASE-SX SFP: It works on multi-mode fiber and operates up to 100 to 550m, using a 770 to 860 nm wavelength.

1000 BASE-LX SPF: This type of transceiver is implemented using either multi-mode or single-mode fiber-optic cabling, it could reach up to a maximum of 10 KM.  

1000 BASE-EX SFP: This type of transceiver is similar to 1000 BASE -LX but achieves a greater running speed of 1310 nm wavelength and a longer distance of 40 KM over single-mode fiber. It is also known as LH (Long Haul) which is a non-standard industry-accepted optic.

1000 BASE-ZX SFP: It uses the speed of 1550 nm wavelength and runs with a distances speed of 70-80 KM in just a single-mode fiber.

CWDM SFP Transceivers: type of optical transceiver that involves technology. Similar to any CWDM or SFP, it is also a cost-effective solution for adopting Fiber Channel and Gigabit Ethernet in data-center, campuses, and metropolitan-area access networks. It can also be found with a variety of transmitter and receiver types, to allow the appropriate transceivers to have each link provide the required optical reach.

DWDM SFP Transceiver: A term for Dense Wavelength-Division Multiplexing. Transceivers are also part of DWDM optical networks rendering BW with high performance across all-optical fiber networks. It is also a multi-range interface that supports any protocol from 100Mbps up to 4.25 Gbps.

SPF PLUS: It is an upgraded version of the SFP transceiver with higher data rates up to 16 Gbps. It is also a 10G fiber optic transceiver which is used for 10G Ethernet and Optical Transport Network. It also has the same dimension as regular SFPs.

Steps in Installing an SFP Transceiver:

  1. Remove the SFP module from the packaging without removing the dust plug.
  2. Verify the SFP transceivers label on the body, to confirm the accurate model required for the network.
  3. Find the location of send and receive markings that identify the top side.
  4. Remove the plugs from the SFP’s optical bores.
  5. Connect or attach the network interface cable connector to the SFP transceiver.
  6. Connect the SFP transceiver to your device.
  7. Check the port status LED.

Third-party manufacturers like QSFPTEK assure compatibility with the help of MSA standards. It helps SFP transceiver modules to have an open market. They are the one who ensures that the competing manufacturers can create an SFP that is compatible with work across multiple brands. With the help of MSA (Multi-Source Agreement), all the elements of both electrical and mechanical are specified, so that the users can feel confident that SFPs modules sold by vendors are identical and with the same standards in form of performance and factor to OEM top brands.

How do lock practices work? To answer that manufacturers from large industry, participate in vendor lock-in practices. Through the detection and settings in hardware and firmware, it detects a third-party transceiver and blocked it so won’t continue from working the device. They have been able to sustain the compatibility, many third-party SFPs are now equipped with the latest innovation.

The OEM manufacturers are now prohibited from voiding equipment warranties by Anti-competitive laws, due to the use of third-party transceivers. Users without the concern of compatibility issues can now confidently purchase the SFP.

Leveraging 100G QSFP28 Transceivers for Efficient Data Center Interconnect – A Comprehensive Guide

In today’s fast-paced digital world, the exponential growth of data has been one of the most defining trends. Data centers, the vital hubs that store, manage, and distribute this vast amount of data, have had to evolve and adapt to handle the demands of today’s global, hyper-connected society. This adaptation involves scaling networks, improving reliability, and increasing bandwidth – tasks that require powerful technology like the 100G transceiver. The 100G QSFP28 transceiver is leading the charge, enabling next-generation high-speed data transmission. This article will delve into the role of 100G transceivers in Data Center Interconnect (DCI), their selection, and their application in various network architectures.

What Is Data Center Interconnect?

Data Center Interconnect refers to the networking of two or more different data centers to achieve business or IT objectives. This multi-site connectivity allows the exchange of data and workload mobility, enabling redundancy, load-balancing, and even disaster recovery capabilities. DCI technology has been widely adopted by large enterprises, cloud service providers, and network service providers to enhance their services, optimize resource utilization, and protect against site failures.

How to Choose 100GBASE QSFP28 in Data Center Applications

When it comes to choosing 100GBASE QSFP28 transceivers for data center applications, multiple factors must be carefully considered. The following parameters are vital in making the right choice that caters to the specific needs of a data center:

QSFP28-100G Transcevier

Transmission Distance: Depending on whether the data center interconnection is taking place over a short, medium, or long distance, different types of 100GBASE QSFP28 transceivers are required. For example, 100GBASE-SR4 transceivers are typically used for short distances up to 100 meters, while LR4 transceivers are designed for longer distances up to 10 kilometers. ER4 and ZR4 are used for very long distances, reaching up to 40 kilometers and beyond.

Capacity: As data centers grow in size and the amount of data they process, so does the capacity demand on the transceivers. The 100GBASE QSFP28 transceivers are designed to handle high capacities, making them ideal for large data center operations.

Data Rate: The ability to transmit data at high speeds is critical in a data center environment. The 100GBASE QSFP28 transceivers, with a data rate of 100 Gbps, offer a significant improvement over previous generations and can meet the high-speed requirements of modern data centers.

High-Density: The form factor of the transceiver plays a significant role when dealing with high-density applications. The compact size of the 100GBASE QSFP28 transceiver enables higher port density on the switches, which is crucial in high-performance computing environments where space is at a premium.

Power Consumption for Electricity and Cooling: Power efficiency is a major consideration in data center operations due to the implications for operational expenditure and environmental sustainability. The 100GBASE QSFP28 transceivers are designed to operate at a lower power consumption compared to older transceiver models. This reduces the electricity needed for operation and the cooling required to maintain optimum operating temperatures, resulting in significant energy and cost savings.

Cost of Transceivers: While performance is a key factor, the cost of the transceivers also plays a significant role. 100GBASE QSFP28 transceivers offer an optimal balance between cost and performance, providing high-speed data transmission at a relatively low cost. However, the total cost of ownership should also consider factors like power consumption and lifespan.

How to Apply 100G Transceivers in DCI

Spine-Leaf Network Architecture

The Spine-Leaf architecture is a two-layer network topology commonly used in data centers for its scalability and high-bandwidth capabilities. In this architecture, every leaf (access) switch is interconnected with every spine (aggregation) switch, ensuring a high level of redundancy and performance. The 100G QSFP28 transceivers play a pivotal role here, enabling high-speed interconnections between the spine and leaf switches and ensuring smooth data flow across the network.

Long-Haul Connection for Data Centers

For metro area networks or long-haul connections between data centers, the 100G transceivers are indispensable. They provide high-speed, reliable, and efficient data transport over long distances. The unique design and advanced technology of the 100G QSFP28 make it ideal for these applications, providing unparalleled performance and reliability.


In conclusion, 100G transceivers, and specifically the 100G QSFP28 modules, are crucial components in today’s data center networking environment. They are instrumental in facilitating high-speed, efficient, and reliable Data Center Interconnect. Whether in the Spine-Leaf network architecture or for long-haul data center connections, these powerful devices deliver top-notch performance that is vital for large enterprise applications, cloud service providers, and network service providers. QSFPTEK‘s 100G QSFP28 modules and S7600 series network switches are highly recommended for those looking to build or upgrade their data center infrastructure. These products offer exceptional quality, superior performance, and unmatched reliability. As the demands on data centers continue to escalate, QSFPTEK’s advanced solutions ensure that your data center is equipped to handle the data demands of the future

Overview of QSFP2 LR4 100G Transceiver

As data traffic continues to rise, efficient data transmission is becoming increasingly essential. Among the many technologies designed to facilitate this, QSFP28 LR4 100G transceivers stand out due to their high performance and reliability. This article aims to provide an overview of QSFP28 LR4, explaining what it is, how it works, and its advantages and applications, with a specific focus on the QSFPTEK QSFP28-100G-LR4-S Solution.

Definition of QSFP28 LR4

Quad Small Form-factor Pluggable 28 (QSFP28) Long Reach 4 (LR4) is a hot-swappable, compact transceiver used for data communications. As the name suggests, QSFP28 LR4 transceivers support a bandwidth of 100 gigabits per second (Gbps), thus meeting the demands of high-speed networks. They are designed to transmit data over a distance of up to 10 kilometers, using single-mode fiber (SMF), and are therefore primarily used in long-haul network applications.


Here is a table detailing the parameters of QSFP28-100G-LR4:

Data Rate100 Gbps
Wavelength1295~1310 nm
Max Distance10 km
Cable TypeSingle Mode Fiber (SMF)
Connector TypeLC Duplex
TX Power-4.3~4.5dBm
Receiver Sensitivity< -10.6dBm
Power ConsumptionMax 3.5W
Operating Temperature0 to 70°C
100G QSFP28 LR4 parameters

How Does 1000G LR4 Work?

The QSFP 100G LR4 transceiver works by converting electrical signals into optical signals and vice versa. It uses a 4-lane approach, where each lane operates at a data rate of 25 Gbps. The 4 lanes use Wavelength Division Multiplexing (WDM), enabling them to operate on four distinct wavelengths, effectively transmitting 100G of data in parallel. These signals are then transmitted over single-mode fiber (SMF) cables up to a distance of 10 km.

On the receiving end, the QSFP28 LR4 transceiver takes the incoming optical signals and converts them back into electrical signals, thereby completing the communication process.

QSFPTEK QSFP28-100G-LR4-S Solution

QSFPTEK offers a highly reliable and efficient solution – the QSFP28-100G-LR4-S transceiver. This module is designed for 100 Gigabit Ethernet links and offers a power-efficient and cost-effective solution for long-haul data transmission. It is fully compatible with the IEEE 802.3ba 100GBASE-LR4 standard, ensuring high interoperability and performance.

QSFP 100G LR4 Advantages

High Speed: With a data transmission rate of 100 Gbps, QSFP28 LR4 can handle high-speed network demands efficiently.

Long Distance: It supports transmission distances of up to 10 km, making it suitable for long-haul applications.

Efficiency: The WDM technology enables four data streams to be transmitted simultaneously, increasing data transmission efficiency.

Hot-swappable: QSFP28 LR4 transceivers can be swapped without turning off the network system, reducing downtime.

QSFP 100G LR4 Applications

100G to 100G Campus Network Connection

In campuses where high-speed data transmission is required across different buildings, QSFP 100GBASE-LR4 transceivers provide a robust solution due to their ability to cover long distances and handle large amounts of data.

100G-100G Interconnect in Data Center

With the surge in cloud computing, data centers require high-speed and reliable interconnections. QSFP28 LR4 transceivers enable efficient communication between servers and switches, helping to maintain fast and reliable data center operations.

100G Connect 100G Enterprise Core Layer

Enterprise core networks, the backbone of an enterprise’s communication infrastructure, can greatly benefit from the high-speed transmission offered by QSFP28 LR4 transceivers. They provide an efficient solution for connecting core switches and routers, thereby ensuring smooth data transmission within the enterprise network.

QSFP28-100G-LR4 FAQs

Q1: Can QSFP28-100G-LR4 transceivers be used in multimode fiber applications?

A1: No, QSFP 100G LR4 transceivers are designed for single-mode fiber applications. They operate at a wavelength of 1310 nm, which is typically used for long-haul transmission over single-mode fiber.

Q2: Are QSFP28-100G-LR4-S transceivers compatible with all devices?

A2: QSFP28 LR4 transceivers are typically compatible with devices that support the QSFP28 form factor and 100G Ethernet. However, it is always recommended to check the device’s compatibility list before purchasing.

Q3: How can I ensure the best performance of my QSFP LR4 100G transceiver?

A3: To ensure the best performance, it’s important to keep the transceiver and the fiber optic connectors clean. Any dust or dirt can affect the signal quality. Also, ensure that the operating conditions like temperature and humidity are within the specified range.

In conclusion, the QSFP28 LR4 100G transceiver is an effective solution for high-speed data transmission over long distances. Its compact form factor, high efficiency, and compatibility with the QSFP28 standard make it a suitable choice for a variety of network applications, including campus networks, data centers, and enterprise core networks.

The High-Performance L3+ Access Layer Switch: A Deep Dive into S5600-24T8X Features and Applications

What is an L3+ Network Switch?

To understand the intricacies of network infrastructures, it’s important to familiarize ourselves with the key components, one of which is the L3+ switch. A Layer 3 (L3) switch, also known as a multilayer switch, operates at both the data link layer (Layer 2) and the network layer (Layer 3) of the OSI model. This means it combines the functionalities of a regular switch and a router, providing hardware-based routing for ultra-low latency. The “+” in L3+ signifies additional features that enhance the switch’s capabilities, such as advanced security, quality of service (QoS), and support for IPv6 technology.

What is an Access Layer Network?

The access layer, often referred to as the network edge, is the first and foremost component of a tier 3 network. It’s the layer that interfaces directly with network devices like computers, printers, and IP phones. The essential function of an access layer switch is to provide a point of entry into the network. This includes controlling device connectivity, implementing policies for different types of network traffic, and managing how packets are forwarded to the network core. With the evolution of networking technology, access layer switches have evolved to support more advanced features, ensuring efficient, secure, and reliable connectivity.

S5600-24T8X: High-Performance L3+ Access Layer Switch

In the vast sea of network switches, the S5600-24T8X distinguishes itself as an exceptional L3+ access layer switch. This high-performance model is specially designed to offer efficient and reliable network services, keeping in tune with the advancing landscape of data transmission.

S5600-24T8X network switch

From its high-density Gigabit access to its high-speed 10G uplinks and impressive switching and forwarding rates, the S5600-24T8X is truly a testament to the power and reliability of modern network switches. This high-performance L3+ access layer switch is thus strategically engineered to not only meet today’s networking demands but also anticipate and adapt to the ever-evolving networking landscape.

Features of S5600-24T8X SFP+ Switch

When delving into the features of the S5600-24T8X SFP+ switch, there are a few remarkable functionalities that separate this model from others in its category. Notably, it supports RDMA (Remote Direct Memory Access), a valuable feature that enables high throughput and ultra-low latency, all while minimizing CPU overhead.

RDMA allows data to move directly from the memory of one computer into that of another without involving the processor, cache, or operating system of either system. This process significantly reduces latency, increases data transfer speed, and frees up resources, making it an invaluable feature for data-intensive applications.

Accompanying RDMA is the combination of PFC (Priority Flow Control) and ECN (Explicit Congestion Notification) functionalities. Once end-to-end network connectivity is established, enabling these two features ensures lossless transport for RDMA over Converged Ethernet (RoCE) traffic. PFC manages the flow of data by pausing specific types of traffic when the network is congested, while ECN alleviates network congestion without dropping packets, thus maintaining the integrity and efficiency of data transport.

In addition to these, the S5600-24T8X switch supports VXLAN (Virtual Extensible LAN), a network virtualization technology that addresses scalability issues in large cloud computing deployments. It also features MLAG (Multi-Chassis Link Aggregation), EVPN (Ethernet Virtual Private Network), VARP (Virtual ARP), and PFC, providing robust tools to handle complex networking scenarios.

Specifically, MLAG allows a switch to join multiple links to achieve higher bandwidth and redundancy, while EVPN facilitates network virtualization and segmentation. VARP, on the other hand, ensures load balancing and network reliability. These features combined render the S5600-24T8X an optimal choice for data centers where high performance, scalability, and reliability are key. 

Application of S5600-24T8X Ethernet Switch

The S5600-24T8X, as a 10G Ethernet switch, finds its application in a multitude of scenarios. It is ideal for SMBs, enterprise networks, and data centers where high performance, bandwidth, and reliability are paramount. Its superior feature set allows it to effortlessly manage complex, high-traffic networks, maintaining swift, secure, and stable connectivity. Moreover, the inclusion of 8*10GE uplink ports is a significant feature of the S5600-24T8X. These ports, equipped to use 10G SFP+ SR/LR modules, provide a robust, high-speed connection to the network backbone. The availability of these 10G uplinks facilitates faster data transfer speeds, ensuring that bottlenecks do not hinder network performance, especially in high-traffic environments. 


The QSFPTEK S5600-24T8X, with its blend of powerful features and high performance, stands as a testament to the advances in L3+ switch technology. Alongside, QSFPTEK’s S7600 series data center switches offer even more powerful options for those in need of greater network capacities. These switches not only meet current networking demands but are also designed with a vision for the future, supporting IPv6 and exhibiting robust data center features. The choice of these switches ultimately allows organizations to build a scalable, secure, and resilient network infrastructure that can evolve with their needs.

100Gbe QSFP Strength and Applications


In the rapidly evolving world of networking, the demand for higher data transfer speeds continues to grow. To meet this demand, the 100GbE QSFP28 (Quad Small Form-factor Pluggable) transceiver has emerged as a powerful solution. With its numerous advantages and wide range of applications, the 100GbE QSFP28 is revolutionizing the way data is transmitted across networks.

SFP to QSFP to QSFP28 – Transceiver Development

The development of transceivers has undergone a remarkable evolution, progressing from Small Form-factor Pluggable (SFP) to QSFP and ultimately to QSFP28. This transition has ushered in significant advancements in data transfer capabilities, empowering networks with higher speeds and increased bandwidth to meet the ever-growing demands of modern applications.

SFP (Small Form-factor Pluggable) transceivers were the initial standard for compact optical modules, primarily used for Gigabit Ethernet applications. These compact transceivers supported data rates of up to 1.25 Gbps and were suitable for short-distance transmissions over multimode fibers. SFP modules quickly gained popularity due to their flexibility, ease of installation, and hot-swappable design.

As the need for higher data transfer speeds emerged, the industry responded with the development of QSFP (Quad Small Form-factor Pluggable) transceivers. QSFP modules introduced a significant leap in performance, offering four times the data capacity of their SFP predecessors. They were capable of supporting data rates of up to 40 Gbps and provided compatibility with various Ethernet and Fibre Channel protocols. However, the demand for even higher speeds and greater bandwidth continued to escalate, leading to the emergence of QSFP28 transceivers. QSFP28 represents the latest standard in transceiver technology, supporting data rates of up to 100 Gbps. By doubling the data capacity of its predecessor, QSFP28 enables network operators to achieve greater efficiency and scalability in their data transmission.

100Gb QSFP28 – What are the Advantages?

100g qsfp28 transceiver

Low Cost per Gbps Traffic: The 100Gb QSFP28 offers a cost-effective solution for high-speed data transmission. With its ability to handle large volumes of traffic, it minimizes the cost per Gbps, making it an efficient choice for network scalability.

High Density: QSFP28’s compact form factor enables high port density, allowing network operators to maximize the utilization of their network infrastructure. This feature is particularly beneficial in data center environments where space is limited.

Fiber Cable Savings: By utilizing the 100Gb QSFP28 transceiver, network operators can save on fiber cabling costs. QSFP28 supports breakout cables, enabling the transmission of multiple lower-speed signals simultaneously over a single fiber, thereby reducing the number of cables required.

100GbE QSFP28 – How to Use It?

The 100GbE QSFP28 transceiver finds application in various network scenarios, including:

Multimode Optical Fiber Wiring between Switches (up to 100m): For short-range connections within data centers, the 100G SR4 variant of QSFP28 is used. It supports multimode fiber connections and is ideal for high-speed communication between switches within a short distance.

Single Mode Optical Fiber Wiring between Switches (100m-2km): When the distance between switches exceeds 100 meters but remains within 2 kilometers, the 100G CWDM4 variant is employed. It enables high-speed transmission over single-mode fiber and is commonly used for interconnecting switches in different sections of a data center.

Long-Range Single Mode Fiber (up to 10km): When the transmission distance extends up to 10 kilometers, the 100G LR4 variant of QSFP28 is utilized. This transceiver allows for reliable long-haul transmission over single-mode fiber, making it suitable for connecting switches across larger network infrastructures.

Long Haul (40km-80km): For even greater transmission distances, the 100G ER4 and 100G ZR4 variants of QSFP28 are deployed. These transceivers are designed to handle long-haul connections, such as those required for metropolitan and regional networks.

Where to Buy Cost-Effective 100G SFP?

When considering the purchase of cost-effective 100G SFP transceivers, QSFPTek offers a range of reliable and high-quality products. QSFPTek’s 100G QSFP series provides a cost-effective solution without compromising on compatibility or performance. With competitive prices and a commitment to customer satisfaction, QSFPTek is a trusted source for acquiring cost-effective 100G SFP transceivers.


The 100GbE QSFP28 transceiver has become an integral component of modern network infrastructure, offering significant advantages such as low cost per Gbps traffic, high port density, and fiber cable savings. Its versatility allows it to be deployed in various network applications, ranging from short-range data center connections to long-haul transmissions. As the demand for high-speed data transfer continues to rise, the 100GbE QSFP28 is poised to play a crucial role in meeting these requirements efficiently and effectively.

Evolution of 100G Transceivers: Empowering High-Speed Data Centers


In today’s fast-paced digital landscape, the demand for high-speed and reliable data transmission has soared, leading to the development of advanced networking technologies. One such breakthrough is the emergence of 100G transceivers, offering lightning-fast data transfer capabilities for a variety of applications. This article explores the different types of 100G transceivers and their significance in transforming data centers and core network infrastructure.

100G Transceiver Types

The evolution of 100G transceivers has witnessed the introduction of various form factors to accommodate diverse networking needs. The 100G CFP (C form-factor pluggable) paved the way for early high-speed transmission, followed by the more compact CFP2 and CFP4 modules. Additionally, the 100G CXP (Compact eXtensible Pluggable) and QSFP28 (Quad Small Form-Factor Pluggable 28) have gained prominence due to their enhanced density and improved power efficiency.

The evolution of 100G transceivers has witnessed the introduction of various form factors to accommodate diverse networking needs. Let’s explore two prominent form factors in detail: the 100G CFP and QSFP28.

100G CFP (C form-factor pluggable)

The 100G CFP transceiver played a pivotal role in enabling early high-speed transmission. It was designed to support 100Gbps data rates and offered a versatile solution for high-bandwidth applications. The CFP module features a larger form factor compared to its successors, allowing for robust optical and electrical interfaces. Its larger size also facilitated efficient heat dissipation, ensuring reliable performance in demanding environments.

The 100G CFP form factor underwent further advancements to enhance its compactness and power efficiency, leading to the introduction of the CFP2 and CFP4 modules.

100G CFP2

The 100G CFP2 module, as its name suggests, is the second-generation form factor of the CFP transceiver. It retains the 100Gbps data rate capability while reducing the physical size compared to the original CFP module. The CFP2 form factor provides a more compact and power-efficient solution, making it well-suited for high-density applications where space and power consumption are critical factors.

100G CFP4

The 100G CFP4 module represents the next step in the evolution of the CFP transceiver family. By further reducing the size, the CFP4 form factor offers even higher density and improved power efficiency compared to its predecessors. This compact form factor allows for more transceivers to be accommodated in a single line card or switch, enabling network operators to maximize port density and optimize their infrastructure.

QSFP28 (Quad Small Form-Factor Pluggable 28)

The QSFP28 transceiver has gained significant prominence in the 100G transceiver landscape, thanks to its enhanced density and improved power efficiency. The “quad” in QSFP28 signifies its capability to support four lanes of high-speed data transmission. Each lane operates at 25Gbps, summing up to the overall 100Gbps data rate.

The QSFP28 module is significantly smaller than the CFP series, making it an ideal choice for applications where space optimization is crucial, such as high-density switches and routers. Its compact form factor also contributes to improved power efficiency, reducing energy consumption and operational costs in data center deployments.

The QSFP28 transceiver supports a wide range of protocols and applications, including 100GBASE-SR4 and various single-mode options, making it a versatile solution for diverse networking requirements.

qsfp28 transceiver

100G QSFP28 and 100G Multimode Transmission

Among the 100G transceiver options, the 100GBASE-SR4 QSFP28 module is widely used for short-range multimode transmission. With its four parallel optical lanes, it delivers high-speed connectivity within data centers and serves as a crucial component in campus network core layers. The 100GBASE-SR4 enables efficient 100G uplinks and supports the ever-increasing bandwidth demands of modern enterprises.

The QSFP28-100G-SR4 transceiver is designed with a compact form factor, conforming to the QSFP28 standard. It incorporates four parallel optical lanes, each operating at 25Gbps, resulting in a total aggregated data rate of 100Gbps. The transceiver module employs Multi-Mode Fiber (MMF) as the transmission medium, which enables efficient data transfer over relatively shorter distances.

The optical interface of the 100G SR4 QSFP transceiver utilizes an MPO (Multi-Fiber Push-On) connector, facilitating the connection of the transceiver with the corresponding fiber optic cabling.

Applications of 100GBASE-SR4 QSFP28 Transceiver

The 100GBASE-SR4 QSFP28 transceiver is specifically designed for short-range multimode transmission within data centers and serves as a critical component in the core layers of campus networks. It offers several advantages in these scenarios:

Data Center Connectivity: 

In high-density data center environments, where rapid data processing and communication are essential, the 100GBASE-SR4 QSFP28 transceiver enables seamless and high-speed connectivity between switches, routers, and servers. Its ability to support 100G uplinks allows for efficient data transfer within the data center fabric, enhancing overall network performance and reducing latency.

Campus Network Core Layers:

The 100GBASE-SR4 QSFP28 transceiver plays a vital role in the core layers of campus networks, enabling fast and reliable communication between different buildings or departments within an organization. By providing high-speed connectivity, it ensures efficient data transfer for bandwidth-intensive applications, such as video streaming, cloud services, and large-scale data processing.

The 100GBASE-SR4 QSFP28 transceiver is well-suited for applications where the transmission distance is limited, typically ranging from a few hundred meters to a few kilometers, depending on the quality and type of multimode fiber used.

100G QSFP Single-Mode Transmission

For long-distance communication, single-mode transmission is essential. The QSFP28 transceiver series offers several options for single-mode applications. The QSFP28-100G-LR4(10km), QSFP28-100G-CWDM4(2km), QSFP28-100G-ER4(40km), and QSFP28-100G-ZR4(80km) modules are designed to deliver high-speed connectivity over extended distances, catering to the connectivity requirements of metropolitan networks, inter-data center connections, and long-haul deployments.

Conclusion: Unleashing the Power of QSFPtek 100G Transceivers

As the demand for high-speed Ethernet continues to grow, QSFPTEK stands at the forefront of 100G transceiver development, offering cutting-edge solutions that empower data centers and network infrastructure. Their 100G transceivers are built to deliver exceptional performance, reliability, and compatibility across a wide range of applications. By leveraging QSFPtek’s state-of-the-art technology, businesses can harness the full potential of 100G Ethernet, unlocking new possibilities in data-intensive environments.

What Are the Types of 100G QSFP28 Cables?

High-speed data transmission is crucial in today’s data-driven world. As the demand for efficient and fast networking solutions grows, 100G QSFP28 cables have become increasingly popular. These cables come in various types, including Direct Attach Copper (DAC) cables and Active Optical Cables (AOC), offering different benefits and applications. In this blog post, we will discuss the different types of 100G QSFP28 cables, their applications, and why you should consider purchasing optical modules at QSFPTEK.COM.

QSFP28 Cables Introduction

QSFP28 cables are designed to support high-speed data transmission at 100Gbps. They are commonly used in data centers, enterprise networks, and high-performance computing environments. QSFP28 cables are designed to support high-speed data transmission at 100Gbps, ensuring fast and efficient data transfer for various applications. They are commonly used in data centers, enterprise networks, and high-performance computing environments to provide a robust and reliable solution to meet the growing demands of today’s data-driven world.

qsfp28 cable types

There are three main types of 100G QSFP28 cables, each with unique features and benefits, catering to different connectivity requirements:

  1. 100G QSFP28 DAC (Direct Attach Copper) cables: These cables utilize copper as the transmission medium, providing a cost-effective solution for short-range, high-speed connections. DAC cables offer low power consumption, low latency, and are suitable for distances of up to 7 meters. They are ideal for data center interconnects, short-range connections within enterprise networks, and high-performance computing clusters.
  2. 100G QSFP28 AOC (Active Optical Cables): AOC cables employ optical fiber for data transmission, allowing for longer transmission distances compared to DAC cables. They support data rates of up to 100Gbps and can reach distances of up to 100 meters. Active Optical Cables use electrical-to-optical and optical-to-electrical converters, enabling higher flexibility, lower power consumption, and improved signal integrity over longer distances. They are ideal for medium-range connections in data centers, enterprise networks, and other high-speed networking applications where copper cables may not be suitable.
  3. MTP-12 Fiber cables with 100GBASE-SR4: These cables use MTP-12 connectors and multi-mode fiber to support high-speed data transmission over distances of up to 100 meters. The 100GBASE-SR4 standard utilizes parallel optics technology, transmitting data over 4 separate lanes, with each lane supporting 25Gbps. MTP-12 fiber cables with 100GBASE-SR4 are well-suited for data centers, high-performance computing environments, and enterprise networks that require high bandwidth and low latency connections.

When selecting the right 100G QSFP28 cable for your specific needs, it is essential to consider factors such as transmission distance, power consumption, latency, and cost. By understanding the unique features and benefits of each cable type, you can make an informed decision and ensure optimal performance and reliability for your network infrastructure.

Cable TypeMaterialDistanceSpeedApplications
100G QSFP28 DACCopperUp to 7 meters100GbpsData centers, short-range connections
100G QSFP28 AOCOptical fiberUp to 100 meters100GbpsData centers, medium-range connections
MTP-12 Fiber cable with 100GBASE-SR4Optical fiberUp to 100 meters100GbpsData centers, high-performance computing, enterprise networks
QSFP28 Cable parameters

Types of 100G Passive DAC

100G QSFP28 to 100G QSFP28 Passive DAC

The 100G QSFP28 to QSFP28 Passive DAC cable is designed for short-range, high-speed connections between QSFP28-enabled devices. These cables use copper as the transmission medium and support data rates of up to 100Gbps over distances up to 7 meters. They are ideal for cost-effective, low-latency connections in data centers and other networking environments.

100G QSFP28 to 4× 25G SFP28 Passive DAC Cable

The 100G QSFP28 to 4x 25G SFP28 Passive DAC cable is designed for high-speed connections between a single QSFP28 port and four separate SFP28 ports. This cable allows for the efficient use of 100G QSFP28 ports by splitting the bandwidth into four individual 25Gbps connections. These cables are ideal for data center interconnects and other high-speed networking applications where multiple 25G connections are required.

 Types of 100G AOC

100G QSFP28 to 100G QSFP28 AOC

The 100G QSFP28 to QSFP28 AOC cable uses active optical technology to transmit data over longer distances compared to passive DAC cables. These cables support data rates of up to 100Gbps and can reach distances up to 100 meters. AOC cables are ideal for data centers and other applications where medium-range connections with lower power consumption and higher flexibility are required.

100G DAC and 100G AOC Applications

100G DAC and 100G AOC cables are widely used in various applications, including:

  1. Data center interconnects: Both 100G DAC and 100G AOC cables are used to interconnect switches, routers, and servers within data centers, providing high-speed

connections for efficient data transmission.

  1. Enterprise networks: These cables are ideal for upgrading enterprise networks, offering increased bandwidth and faster data transfer rates to meet the growing demands of modern businesses.
  2. High-performance computing (HPC) clusters: In HPC clusters, low latency and high bandwidth are essential. Both 100G DAC and 100G AOC cables provide the high-speed connections required for optimal performance in these environments.
  3. Cloud service providers: 100G DAC and 100G AOC cables can be used to build high-speed connections between data centers and cloud service providers, ensuring efficient and reliable data transfers for cloud-based applications and services.


100G QSFP28 cables, including DAC and AOC cables, offer high-speed data transmission capabilities and cater to a wide range of applications, from data centers to enterprise networks and high-performance computing environments. Choosing the right cable type for your specific needs is crucial to ensure optimal performance and cost-effectiveness. We recommend purchasing optical modules and cables at QSFPTEK.COM, as they offer a wide selection of high-quality, cost-effective solutions, including 100G QSFP28 DAC and AOC cables. QSFPTEK is committed to providing excellent customer service, competitive pricing, and superior quality products, making them the perfect choice for all your optical module and cable needs. Upgrade your network infrastructure with QSFPTEK’s advanced and efficient 100G QSFP28 cables today.

QSFP28 and SFP28 Transceiver Modules – How to Use?

As the demand for higher network speeds and increased data capacity grows, so does the need for transceiver modules that can keep up. Two such modules that have gained significant popularity in recent years are QSFP28 and SFP28. In this blog post, we’ll discuss the different types of these modules, their applications, and how they can be used to boost network performance.

What is a 100G QSFP28 Module?

The QSFP28 (Quad Small Form-factor Pluggable 28) is a high-density, high-speed optical transceiver module designed for 100 Gigabit Ethernet (100GbE) connections. It is an evolution of the QSFP+ standard, offering four times the data rate per channel. With its compact size and low power consumption, QSFP28 is an ideal solution for data center applications, high-performance computing, and 5G front-haul networks.

100G QSFP28 Transceiver

100G QSFP optic module Types

There are several types of 100G-BASE QSFP modules available in the market, each with its own set of specifications and use cases. In this section, we’ll compare the parameters of QSFP28-100G-SR4, QSFP28-100G-LR4, and QSFP28-100G-ER4.

QSFP28-100G-SR4 is designed for short-range connections and is based on the 100GBASE-SR4 standard. It operates over multi-mode fiber (MMF) with a maximum reach of 100 meters using OM4 fiber.

QSFP28-100G-LR4, on the other hand, is designed for long-range connections and is based on the 100GBASE-LR4 standard. It operates over single-mode fiber (SMF) with a maximum reach of 10 kilometers.

QSFP28-100G-ER4 is intended for extended-range connections and is based on the 100GBASE-ER4 standard. It also operates over single-mode fiber (SMF) but has a maximum reach of 40 kilometers.

QSFP28 ModuleStandardFiber TypeMaximum Reach
QSFP28-100G-SR4100GBASE-SR4MMF100m (OM4)
100G Module types

What is an SFP28 Module?

The SFP28 (Small Form-factor Pluggable 28) module is an upgraded version of the SFP+ standard, offering higher data rates of up to 25 Gigabit Ethernet (25GbE). SFP28 maintains the same form factor as its predecessor, allowing for seamless integration into existing SFP+ infrastructures while providing significant improvements in speed and efficiency. This makes SFP28 an attractive choice for data center applications, core to distribution layer connections, and 5G front-haul networks.

25G SFP and 100G QSFP Application: Data Center and 5G Front-Haul

Both QSFP28 and SFP28 modules play critical roles in modern data centers and 5G front-haul networks. QSFP28 modules enable 100G connections, allowing data centers to handle increased traffic and improve overall performance. In addition, QSFP28 can be configured as 100G to 4x25G, providing flexibility in connecting high-speed devices.

SFP28 modules, with their 25G data rate, are perfect for core layer to distribution layer connections, facilitating faster data transfer between network devices. Furthermore, they can be used in QSFP28 to SFP28 breakout applications, enabling seamless integration of 25G and 100G devices.

In 5G front-haul networks, both 100GBASE QSFP and SFP28 modules support the high bandwidth and low latency requirements necessary for 5G applications. The combination of these modules helps operators build flexible, scalable, and efficient networks to meet the ever-growing demand for data.


In conclusion, QSFP28 and SFP28 transceiver modules have become essential components in modern networking infrastructures, especially for data centers and 5G front-haul networks. Their high-speed capabilities, combined with their compatibility with existing systems, make them invaluable tools for addressing the increasing demand for data capacity and faster network speeds. By understanding the different types of QSFP28 and SFP28 modules and their applications, network operators and data center managers can optimize their infrastructures and prepare for the future of connectivity.

SFP vs SFP+ vs QSFP+, what is the difference?

In the world of optical communications, several types of transceiver modules are widely used for different applications. Among them, SFP, SFP+, and QSFP+ are the most common. In this blog post, we will discuss the main differences between these transceiver modules and help you understand their applications better. Let’s dive in!

What is an SFP optic module?

SFP, or Small Form-factor Pluggable, is a compact, hot-pluggable transceiver module used for both telecommunication and data communications applications. It converts electrical signals to optical signals and vice versa, allowing devices such as switches, routers, and servers to connect to fiber optic or copper networking cables. SFP modules are designed to support a variety of data rates and protocols, including Gigabit Ethernet, Fibre Channel, and SONET.

SFP and SFP+, big upgrade

As data transmission demands increased, the need for higher capacity transceivers became evident. SFP+ (Small Form-factor Pluggable Plus) is an upgraded version of the SFP module, offering a significant improvement in data rate capability. While SFP supports data rates up to 4.25 Gbps, SFP+ can handle speeds up to 10 Gbps. This increase in performance makes SFP+ a popular choice for 10 Gigabit Ethernet and 8G Fibre Channel applications.

What is QSFP? QSFP+ transceiver overview

QSFP (Quad Small Form-factor Pluggable) is a high-density, high-performance optical transceiver module that can support data rates of up to 40 Gbps. QSFP+ is an enhanced version of QSFP, providing even higher data rates, up to 100 Gbps. These transceivers are primarily used in high-speed data center and telecommunications applications, where their high data rates and compact size make them an ideal solution.

QSFP+ transceiver

SFP+ vs QSFP+, Parameter comparison

To better understand the differences between SFP+ and QSFP+, let’s compare their key parameters:

Data RateUp to 10 Gbps    Up to 40 Gbps
Transmission DistanceUp to 80 km (depending on the module type)Up to 40 km (depending on the module type)
Form FactorSmaller, single-channelLarger, 4-channel
Connector TypeLC or SCMPO or MTP or LC
Applications10 Gigabit Ethernet, 8G Fibre Channel40G Ethernet, InfiniBand, 100G Ethernet

From the table above, we can see that QSFP+ modules offer significantly higher data rates than SFP+ modules, making them suitable for more demanding applications such as 40G Ethernet and 100G Ethernet. However, SFP+ modules are smaller and more versatile, making them a popular choice for lower-speed applications.

40G to 10G, what is it?

The transition from 10G to 40G networks is becoming increasingly common as businesses look for ways to enhance their network infrastructure and meet the growing demands of data centers and telecommunications. One popular way to achieve this is by using a 40G to 4x10G connection, which allows for seamless integration between access and aggregation layers in the network.

Using a QSFP-40G-SR4 transceiver at the aggregation layer and SFP-10G-SR transceivers at the access layer is a widely adopted method for this type of connection. The QSFP-40G-SR4 module supports 40G data rates and has an MPO/MTP connector, while the SFP-10G-SR module supports 10G data rates and uses an LC connector. To establish the connection, a breakout cable (also known as a fan-out or harness cable) is used, which has one MPO/MTP connector on one end and four LC connectors on the other end.

This configuration enables the QSFP-40G-SR4 module to transmit data to four separate SFP-10G-SR modules simultaneously, essentially breaking down the 40G link into four individual 10G links. This approach is particularly useful when you need to connect access layer devices with lower-speed requirements to high-speed aggregation switches, ensuring smooth data transmission and efficient use of resources.


In conclusion, SFP, SFP+, and QSFP+ are all essential optical transceiver modules that serve different applications based on their capabilities. SFP is widely used for Gigabit Ethernet, while SFP+ is ideal for 10 Gigabit Ethernet and 8G Fibre Channel applications. On the other hand, QSFP+ is perfect for high-speed data center and telecommunications applications that demand high data rates and high-density solutions.

 100G QSFP28 Choose Guide: 100GBASE-SR4 vs 100GBASE-LR4

In today’s ever-growing world of data, high-speed networks are a must. As businesses continue to rely on efficient data centers and networks, there is an increasing demand for faster and more powerful solutions. The 100G QSFP28 transceiver is one such solution that has become increasingly popular, offering the advantages of both QSFP+ and QSFP28 technologies. In this blog post, we will discuss the benefits of upgrading to QSFP28, the most popular QSFP28 module in 2023, and compare the 100G QSFP28 SR4 and 100G QSFP28 LR4 modules.

 QSFP+ Upgrade to QSFP28, What are the Advantages?

The 100G QSFP is an advanced version of the QSFP+ (Quad Small Form-factor Pluggable Plus) transceiver, offering a host of benefits over its predecessor. As we upgrade from QSFP+ to QSFP28, we can see the following advantages:

  1. Higher bandwidth: QSFP supports 100Gbps bandwidth, which is four times the capacity of QSFP+ (40Gbps). This enables faster data transmission and better performance in data centers and other high-speed applications.
  2. Increased port density: QSFP28 modules have the same physical size as QSFP+ modules, making it possible to fit more ports into the same space, leading to higher port density and improved space utilization.
  3. Enhanced energy efficiency: QSFP28 modules consume less power than QSFP+ modules, reducing energy costs and contributing to a greener environment.
  4. Backward compatibility: QSFP28 modules are backward compatible with QSFP+ ports, allowing for a seamless transition when upgrading your network infrastructure.

The Most Popular 100G QSFP Module in 2023

As of 2023, the 100G QSFP28 SR4 (100GBASE-SR4) module has emerged as the most popular QSFP28 transceiver in the market. The 100G QSFP28 SR4 is ideal for short-range, multi-mode fiber connections in data centers and enterprise networks, supporting link lengths of up to 100 meters over OM4 fiber. Its popularity can be attributed to its excellent performance, cost-effectiveness, and widespread compatibility with a variety of network equipment.

100G QSFP28

QSFP28-100G-SR4 vs 100GBASE-LR4, What is the Difference?

When comparing the QSFP28 100G SR4 and 100G LR4 modules, we can find several key differences:

  1. Transmission distance: The 100G QSFP28 SR4 module is designed for short-range applications, with a maximum transmission distance of 100 meters over OM4 fiber. In contrast, the 100G QSFP28 LR4 module supports longer-range connections, with a reach of up to 10 kilometers over single-mode fiber.
  2. Fiber type: The 100G QSFP28 SR4 module uses multi-mode fiber, while the 100G QSFP28 LR4 module employs single-mode fiber.
  3. Cost: The 100G QSFP28 SR4 module is generally more cost-effective than the 100G QSFP28 LR4 module due to its shorter transmission range and lower power consumption.

100GBASE-SR4 Application

The 100G QSFP28 SR4 module is ideally suited for various applications, including:

  1. Data center interconnects: The 100G SR4 module is perfect for high-speed, short-range connections between data center switches, routers, and servers.
  1. Enterprise networks: The QSFP28 SR4 module can be used to upgrade existing enterprise networks, providing faster data transmission and increased capacity to meet growing demands.
  2. High-performance computing (HPC) clusters: The high-speed data transfer capabilities of the 100G QSFP28 SR4 module make it ideal for HPC clusters, where low latency and high bandwidth are crucial.
  3. Cloud service providers: The 100Gbase- SR4 module can be used to build high-speed connections between data centers and cloud service providers, ensuring efficient and reliable data transfers.


In conclusion, the 100G QSFP28 transceiver is an excellent choice for businesses looking to upgrade their network infrastructure to meet the demands of today’s data-intensive world. The 100GBASE-SR4 module, in particular, has emerged as a popular and cost-effective solution for short-range, high-speed connections in various applications, including data centers, enterprise networks, and HPC clusters. If you are considering upgrading your network, we recommend purchasing optical modules at QSFPTEK.COM