How to Convert QSFP+ to SFP+ Port

In modern networking and data communication, conversion between various port types like Quad Small Form-Factor Pluggable Plus (QSFP+) and Small Form-Factor Pluggable Plus (SFP+) becomes necessary. Several methods enable this conversion, and each one brings unique characteristics to the table.

QSFP+ to SFP+: MTP to LC Breakout Cable

The MTP to LC breakout cable provides a smooth transition between QSFP+ and SFP+ connections. It uses an MTP connector on one end for the QSFP+ port and multiple LC connectors for the SFP+ end. Selection requires care in identifying compatible cables, considering the length and material for signal quality, and ensuring the devices support the conversion. Simply plug the MTP end into the QSFP+ port, connect the LC connectors to corresponding SFP+ ports, and align the settings on both devices.

40G QSFP+ to 10G SFP+ Breakout

QSFP+ to SFP+: QSFP+ to SFP+ DAC and AOC Cable

Direct Attach Cables (DAC) and Active Optical Cables (AOC) offer another straightforward way to achieve the QSFP+ to SFP+ conversion. For DAC, choose a cable that meets the specifications of both devices and connect the QSFP+ end to the QSFP+ port and the SFP+ end to the SFP+ port. AOC follows a similar process but can support longer connections. Always weigh the distance, price, and performance when selecting between DAC and AOC.



CVR-QSFP-SFP10G, known as QSA (QSFP to SFP Adapter), is a specially designed module that enables QSFP+ ports to utilize SFP+ transceivers. It’s a simple procedure involving the insertion of the QSA module into the QSFP+ port, plugging an SFP+ transceiver into the QSA, and connecting the suitable cable to the SFP+ transceiver. Check for compatibility and performance differences in this conversion, as not all devices and transceivers may work seamlessly with the QSA module.

How to Make the Best Choice to Convert QSFP+ to SFP+

Selecting the ideal method to convert QSFP+ to SFP+ is a multi-faceted decision that relies on understanding specific requirements. The key elements to consider in this decision-making process are the transmission distance, port density, and solution cost.

Transmission Distance

The transmission distance plays a pivotal role in choosing the conversion method. If shorter distances are needed, a flexible option like an MTP to LC breakout cable may be suitable, though it can experience signal loss over longer stretches. For those looking to connect devices closer together, DAC is an effective choice, whereas AOC is designed to accommodate longer connections without noticeable signal loss. If a variety of distances need to be supported, the QSA module offers flexibility, with the choice of SFP+ transceiver determining the possible transmission range.

Port Density

Consideration of port density is vital for network scalability and future growth. The use of an MTP to LC breakout cable may influence overall port density since it requires multiple LC connectors for each QSFP+ port. On the other hand, DAC and AOC provide a straightforward one-to-one connection between QSFP+ and SFP+ ports, generally without impacting port density. Those seeking adaptable solutions might opt for QSA modules, allowing for various port densities by fitting different types of SFP+ transceivers.

Solution Cost

The cost of the conversion solution is often a determining factor in selection. An MTP to LC breakout cable is typically more budget-friendly but may require additional components, leading to increased costs. DAC is a cost-effective choice for shorter distances, while AOC, though more expensive, is suitable for longer connections. For more complex or expanding networks, the QSA module, although a higher initial investment, can be a versatile and potentially cost-effective solution in the long run.


The process of converting QSFP+ to SFP+ offers multiple paths, each with unique considerations and applications. From MTP to LC breakout cables to DAC and AOC cables and QSA modules, the conversion can be performed effectively. Careful assessment of individual needs and constraints will guide the best choice, ensuring network performance and coherence in various system environments.

How Many Types of SFP Transceivers Do You Know?

What Is an SFP Module?

An SFP (Small Form-factor Pluggable) module is a compact and hot-pluggable optical transceiver used for both telecommunication and data communication applications. It interfaces between communication devices like switches and routers to a fiber optic or copper networking cable. SFP modules are designed to support several communication standards including Gigabit Ethernet, Fibre Channel, and SONET. They are available in various transmission ranges, covering short distances through multimode fiber to long distances via single mode fiber. SFPs are highly flexible, allowing network operators to choose the appropriate transceiver according to the required optical reach and type of optical fiber. This adaptability makes them a popular choice in diverse networking environments, enhancing connectivity and enabling seamless data transmission.

SFP transceiver cable type

Small Form-factor Pluggable (SFP) transceivers are divided into two main categories based on the type of optical cables they utilize: Multimode and Single Mode. Multimode SFPs work with optical cables identified as OM1, OM2, OM3, or OM4, while Single Mode SFPs operate with OS2 cables. The primary difference between these two is not only the cable type but also the working wavelength and fiber type. Here’s a simple summary:

TypeCableWavelengthFiber Type
Multimode SFPOM1/OM2/OM3/OM4850nm62.5/125µm or 50/125µm
Single Mode SFPOS21310 and 1550nm9/125µm core SMF
CWDM SFPOS21270~1610nm 9/125µm core SMF
DWDM SFPOS21528~1561nm9/125µm core SMF

SFP transceiver transmission range

The transmission range of SFP transceivers is dictated by their design and the wavelengths they utilize.

sfp module types

Copper SFP:The Copper SFP RJ45 transceiver is a unique variant of the Small Form-factor Pluggable (SFP) module that connects with copper cables instead of optical fibers. Utilizing an RJ45 connector, it allows for transmission over traditional Cat5e or Cat6 Ethernet cables. Typically used for Gigabit Ethernet applications, Copper SFP RJ45 transceivers are favored for shorter reach network connections, offering a cost-effective and easily deployable solution. Their compatibility with copper infrastructure makes them an attractive option for integrating various networking devices, including switches and routers.

SFP-1GBASE-T: Up to 100m

Multimode SFPs: Perfect for shorter distances, providing a cost-effective solution. Most commonly use an 850nm wavelength, allowing a reach of up to 550 meters. If a more extended multimode range is needed, a 1310nm wavelength can be used to achieve up to 2km.

850nm SX SFP: Up to 550m. Usually applied In rack 1Gbps connection.

Single Mode SFPs: These are suitable for long-distance communication, with a reach from 10km to a staggering 200km. 

Various types include:

Standard 1310nm LX SFP: Up to 10km. Applied between 2 buildings in an area.

Extended 1310nm EX SFP: Up to 40km. Applied between a town.

Standard 1550nm ZX SFP: Up to 80km. Applied between 2 cities.

Extended 1550nm ZX SFP: Up to 160km. Applied in long haul transmission. 

BiDi SFPs with wavelengths like 1310nm/1550nm, 1310nm/1490nm, and 1510nm/1590nm: 10 km to 160 km. Save half of fiber cable.

Utilizing DWDM/CWDM technology with EDFA  can extend the reach up to 200 km.

SFP module application

  • BiDi SFP: Offering data transmission and reception through a single optical fiber, these streamline cabling systems and cut costs.
  • CWDM/DWDM SFPs: Used for long-haul telecom systems, these allow simultaneous transmission of multiple signals on a single fiber.
  • PON SFPs: Installed at both ends of a fiber connection, in Central Offices and subscriber premises, these enable broadband communication.
  • Fibre Channel SFP: With speeds ranging from 1 to 128 Gbps, these primarily connect data storage to servers in data center environments.
  • SONET/SDH SFP: These are tailored to standards covering data rates from OC-3/STM-1 (155 Mbps) to OC-48/STM-16 (2488 Gbps), with options for different reach applications.

Where can I buy all types of sfp transceivers?

Various SFP transceivers like 1000base-t, 1g-sx, 1g-lx, 1g-ex, 1g-zx, 1g-ezx, 1g-cwdm, and 1g-dwdm are priced differently, reflecting their unique specifications. A comprehensive price list can be viewed at Here is a summarized chart:

TypePrice (check website)


SFP transceivers are vital in the modern world of communication, offering a variety of types, applications, and price ranges. From short-reach multimode connections to long-haul single mode networks, these devices provide flexibility and performance that cater to different needs. Whether it is HD video transmission, data center connectivity, or long-distance telecommunication, the diverse SFP modules ensure the optimal solution. Understanding their specifications, range, and costs enables professionals and businesses to make informed decisions, harnessing the power of these innovative tools to connect the world.

Data Center Cabling: SFP+ DAC Cables vs AOC Cables


The digital age we live in thrives on data, and data centers are the beating heart of this world. At the core of these data centers are the complex cabling systems, mainly involving Direct Attach Copper (DAC) cables VS Active Optical Cables (AOC). DAC VS AOC cables are the preferred cabling options for high-speed data center applications. They both perform the function of connecting switches to routers and servers, but they have significant differences in terms of construction, cost, power consumption, and distance limitations.

DAC vs AOC Basics and Types

Direct Attach Copper Cables (DAC)

Direct Attach Cables (DAC) are bifurcated into two categories: Passive DAC and Active DAC. The classification is based on their signal transmission functionality.

A Passive DAC cable, as the name suggests, lacks any form of signal conditioning or amplification. The distance of the passive dac is less than 7 meters. This means it transmits data without any adjustments or enhancements to the signal, hence termed “passive”. Owing to this lack of electronic components, passive DAC cables tend to be less expensive, making them an economical choice for data transfer applications within short distances.

Conversely, an Active DAC cable incorporates electronic components to enhance and amplify the signal during transmission. The distance of the passive dac is less than 15 meters. The transmitted signal is continuously compared with the original data, allowing the cable’s electronic circuitry to detect and correct any discrepancies or distortions in real time. This ensures a high-quality data transmission, especially beneficial for long-distance applications or scenarios where high-resolution audio is required.

Active Optical Cables (AOC)

On the other hand, AOC cables use fiber optic technology to transmit data over longer distances (up to 100 meters). They come with transceivers already attached, which convert electrical signals into optical signals and vice versa, making them a plug-and-play solution. While they offer a better performance over longer distances, they are more expensive and consume more power.

Comparison: DAC vs AOC

In the quest for efficient data center cabling, several factors need to be considered. Beyond distance, power consumption, and cost, factors such as cable weight, cable size, and bend radius also play a significant role in decision-making. Here’s a more detailed comparison between DAC and AOC cables:

DAC Cable(Active and passive)AOC Cable
Maximum Distance≦15m≦100m
Cable TypesTwinax copper cableMultimode OM3/OM4 Fiber Cable
Power Consumption≦0.5W≦1W
Cable WeightHeavierLighter
Cable Size4.2mm(30AWG)6.0mm(24AWG)Typical 3.0mm
Bend Radius24 AWG=38mm

Small Form-Factor Pluggable Plus (SFP+) DAC and AOC cables are typically used for 10G Ethernet networks. SFP+ DAC cables can reach up to 10 meters, making them suitable for close-range connections. They offer low power consumption, low latency, and are more cost-effective than their AOC counterparts.

AOC cables, on the other hand, provide an efficient solution for longer distances up to 100 meters or more. While they consume more power, AOC cables provide better signal quality over longer distances. They are also thinner and lighter, offering better airflow and easier cable management in dense networking environments.

AOC vs DAC Application Scenarios

Depending on the specific requirements of your data center, you might choose between DAC and AOC cables.

DAC cables are ideally suited for short-distance, high-speed interconnections between servers and switches within the same rack or adjacent racks. They provide a cost-effective solution for high-speed data transfers with low latency.

AOC cables are the preferred choice for longer inter-rack cabling, usually connecting devices across different racks or rows. They are immune to electromagnetic interference, providing more reliable performance for critical networking tasks. They are also favored in areas where weight and radius of cable bend could be an issue due to their light and flexible nature.

Choosing Between DAC and AOC

The choice between DAC and AOC depends on the specific requirements of your data center or networking environment. Here are some key considerations to help guide your decision-making:

DAC Cables:

DAC cables are a popular choice for high-performance computer systems, large-scale commercial operations, and storage applications due to their superior short-distance transmission capabilities. These cables consume very little power, making them highly energy-efficient and cost-effective. They offer low latency, ensuring fast and seamless data transmission, which is crucial in a high-performance computing environment.

DAC cables shine in scenarios where the connected devices, such as rack-mounted network servers and storage, are located in close proximity to top-of-rack switches. Given their maximum transmission distance of 10 meters, they are ideally suited for intra-rack connections or between adjacent racks. So, if your primary need is short-range, cost-effective, and power-efficient cabling with high performance, DAC cables would be the perfect fit.

AOC Cables:

Active optic cables, in contrast, are your go-to solution for long-distance transmission. These cables can transmit data up to 100 meters or more, making them suitable for interconnecting devices located across different racks or even rows. They offer ultra-high bandwidth, which ensures that high volumes of data can be transmitted simultaneously without any performance drop.

The physical attributes of AOC cables also make them an appealing choice. They are small, light, and flexible, which makes them easy to install and manage, especially in dense networking environments. In addition, AOC cables are immune to electrical interference, which ensures a more stable and reliable performance, particularly in environments with a high degree of electrical noise.


DAC vs AOC cables largely depends on the specific needs and architecture of your data center. Therefore, when choosing the appropriate cabling solution, consider factors such as distance, power consumption, cost, and the specific application scenario in your data center. By doing so, you can ensure you’re leveraging the right technology for the optimal operation of your data center.

SFP vs SFP+: How to Choose? A Complete Guide

What Is an SFP Module?

Small Form-factor Pluggable (SFP) is a compact, hot-pluggable transceiver used for both telecommunication and data communication applications. As the name suggests, its small form-factor allows for high port density, while it’s hot-pluggable characteristic means it can be plugged into a switch or router that is running without needing to power down the device.

These modules connect a network device motherboard (for a switch, router, media converter or similar device) to a fiber optic or copper networking cable. It is designed to support several communication standards such as gigabit Ethernet, Fibre Channel, synchronous optical networking (SONET) and more. Each SFP module has a specific type, divided by which network protocol it supports and what type of wiring it operates over.

Choose SFP Copper or Fiber Module?

When deciding between SFP copper or fiber modules, the decision largely comes down to the specific needs and distances of your network. SFP copper modules, or RJ45 SFPs, are typically used for short distances of up to 100 meters, and they use standard Category 5 Ethernet cable. They are a cost-effective solution for shorter range, in-building data communication. Currently, many data center switches lack RJ45 electrical ports, despite a strong demand for them from customers. This demand largely stems from the need to connect to access layer devices and terminal computers, among others. Copper SFP optical modules can address this requirement effectively. These modules allow for the integration of an electrical port module with the SFP optical port, facilitating connection with Category network cables. This approach has gained considerable popularity in recent times.

On the other hand, fiber SFP modules are more suitable for long-distance data transmission. They have a greater reach, capable of transmitting data over distances from 500 meters to 100 kilometers depending on the exact module type. However, they are more expensive compared to copper modules and require the use of fiber optic cables.

SFP or Advanced SFP+?

SFP and SFP+ modules are both widely used in data and telecommunication applications, but they have some crucial differences.

Data RateUp to 1Gbps, Backward 100MbpsUp to 10Gbps, Backward 1Gbps
DistanceUp to 150km (depending on type)Up to 100km (depending on type)
ApplicationGigabit Ethernet, Fibre Channel, SONET, etc.10 Gigabit Ethernet, 8G Fibre Channel, SONET, etc.

As shown, the main difference between SFP and SFP+ is the data rate. SFP supports speeds up to 1Gbps, while SFP+ supports up to 10Gbps, making SFP+ more suitable for data-intensive applications or larger networks.

SFP and SFP+ MSA Standards

SFP MSA Standard

The SFP MSA standard was first established by a consortium of companies, including Agilent Technologies and IBM, in 2000. The aim was to create a standard design for hot-pluggable transceivers to replace the older gigabit interface converter (GBIC) modules. The standard has been updated several times since its inception, with each new revision aimed at expanding the scope of the standard to new types of networking.

The SFP MSA standard covers modules that operate at a range of speeds, including Fast Ethernet, Gigabit Ethernet, and Fibre Channel. SFP transceivers have a standard physical size and shape, but can be differentiated based on the type of connection they support (copper or fiber), the wavelength for fiber optics, the data rate, and the maximum transmission distance.

SFP+ MSA Standard

The SFP+ MSA standard, an extension of the original SFP standard, was introduced to meet the demand for higher data rates in networking equipment. It supports data rates up to 10 Gbps, ten times faster than standard SFP modules.

While SFP+ modules share the same physical form factor as SFP modules, the primary difference lies in their support for higher bandwidth applications such as 10 Gigabit Ethernet, 8G Fibre Channel, and 10G Fibre Channel over Ethernet (FCoE). They also provide options for Direct Attach Cable (DAC) assemblies, active optical cables, and enhanced Small Form-factor Pluggable (SFP+).

By adopting the SFP+ MSA standard, manufacturers can create modules that are backward compatible with SFP ports. However, while you can plug an SFP module into an SFP+ port, an SFP+ module won’t work in an SFP port due to its higher power and signal rate requirements.

Can We use SFP module in SFP+ port?

Yes, you can generally use an SFP module in an SFP+ port. SFP+ is designed to be backwards compatible, so it will negotiate down to the speed of the SFP module. However, you cannot use an SFP+ module in an SFP port as the port won’t be able to support the higher speed of the SFP+ module.

While this compatibility exists, you should always refer to the documentation of your network device to ensure compatibility, as some manufacturers may limit functionality between different generations of devices.

OEM SFP or Third-party SFP?

Original Equipment Manufacturer (OEM) SFP modules are produced by the same manufacturers as your networking equipment. They guarantee compatibility and often come with comprehensive support and warranties. However, they tend to be more expensive than third-party SFPs.

Third-party SFP modules, on the other hand, are produced by independent manufacturers. They can offer the same functionality at a fraction of the cost of OEM modules. The key here is to ensure that the third-party manufacturer is reputable, and their modules are tested for compatibility with your specific network device.

In conclusion, the choice between OEM and third-party SFP modules largely comes down to cost, support, and personal preference. As long as the modules are compatible, either should work well in your network.

XFP vs SFP+: A Comparative Analysis in the Realm of Optical Transceiver Modules

The digital world is powered by data, and this data travels at incredible speeds across vast networks to bring the world closer together. One of the integral components that ensure efficient and reliable data transmission in networking devices are optical transceivers. In this blog post, we’re going to delve deep into two widely used types of transceiver modules – XFP vs SFP+ – comparing their standards, parameters, and application scenarios.

XFP vs SFP+: Standard

XFP, or 10 Gigabit Small Form Factor Pluggable, is a hot-pluggable transceiver used for high-speed computer network and telecommunication links that use optical fiber. It adheres to the standards of SONET OC-192, SDH STM-64, and 10 Gbit/s Optical Transport Network (OTN) OTU-2.

On the other hand, SFP +, or Small Form Factor Pluggable Plus, is an enhanced version of the SFP that supports data rates up to 16 Gbps. The SFP+ standards include SONET OC-192, SDH STM-64, OTN G.709, CPRI wireless, 16G Fibre Channel, and the emerging 32G Fibre Channel application.

XFP vs SFP+: Parameters Comparison

To offer a comprehensive understanding of XFP and SFP+, here is a tabular comparison of their key parameters.

Publish Time20022006
StandardSONET OC-192, SDH STM-64, 10 Gbit/s OTN OTU-2SONET OC-192, SDH STM-64, OTN G.709, CPRI wireless, 16G FC, 32G FC
Form Factor SizeLargerSmaller
Power ConsumptionHigher (3.5W)Lower (1W)
Data Rate10 Gbit/s10 Gbit/s, 16 Gbit/s, 32 Gbit/s

As can be inferred from the table, SFP+ comes out as the more advanced and efficient transceiver, with a higher data rate capacity, lower power consumption, and smaller size.

SFP+ vs XFP: Application Scenarios

Now that we’ve understood the basic differences between XFP and SFP+, let’s look at where these transceivers find their applications.

XFP is commonly used in 10 Gigabit Ethernet, 10 Gbit/s Fibre Channel, 10 Gbit/s SONET/SDH/OTN and CWDM/DWDM systems. It is designed for the larger form factor slots in network routers and switches.

SFP+, being a more advanced and compact version, finds broader applications. It is employed in 10G, 16G, and even 32G Fibre Channel systems. SFP+ is widely utilized in data center connections, high-performance computing (HPC) environments, enterprise wiring closets, large cloud service providers, and carrier-neutral internet exchanges.


Q: Can SFP+ modules be used in XFP slots?

A: No. The physical form factors are different, and hence, SFP+ modules cannot be used in XFP slots and vice versa.

Q: Can XFP and SFP+ modules interoperate?

A: Yes. XFP and SFP+ modules can interoperate with each other over a single link if they are operating at the same data rate.


Both XFP and SFP+ have made significant contributions to the development of the optical network. However, the SFP+ with its smaller size, lower power consumption, and higher data rates, seems to be the more favorable option in most modern networking environments.

Despite this, it’s essential to remember that the best choice between XFP and SFP+ greatly depends on the specific application scenario and the requirements of the network. Both transceiver types have their own merits and roles to play in the vast landscape of optical communication. Therefore, it is essential to make informed decisions based on individual networking needs and circumstances.

What is 100G QSFP28 CWDM4 transceiver?

The 100G QSFP28 CWDM4, a cutting-edge optical transceiver, is one of the significant advancements in the world of network infrastructure. It stands for Quad Small Form-factor Pluggable 28 Coarse Wavelength Division Multiplexing 4. In essence, this transceiver utilizes wavelength division multiplexing technology to increase the quantity of data sent over a single fiber optic cable, providing impressive speeds up to 100 gigabits per second (100G).

The “QSFP28” part of the name refers to the transceiver’s format, which can accommodate high-speed electrical interfaces for data rates up to 100G. “CWDM4” designates the device’s use of four channels, each using a different wavelength, to transmit and receive data. This particular technology allows for a total of 100G data transmission across a 2 km single-mode fiber, which greatly improves the efficiency of data center interconnections.

Work Principle for QSFP28 CWDM4

The operation of a QSFP28 CWDM4 transceiver is based on the principles of coarse wavelength division multiplexing (CWDM). The CWDM technology divides the total bandwidth into multiple channels, each assigned a unique wavelength. This allows simultaneous transmission of different data streams over a single fiber optic cable.

In the case of the QSFP28 CWDM4, there are four channels in use, each with its specific wavelength between 1270nm and 1330nm, spaced 20nm apart. These four wavelengths are multiplexed together and sent across a single fiber for both transmit and receive functions. This multiplexing action results in a quadrupling of the fiber optic cable’s data-carrying capacity, achieving data rates up to 100Gbps.


QSFPTEK CWDM4 Specification

Based on the specification provided at, the QSFPTEK CWDM4 comes with impressive features. Here is a summary:

Data Rate100Gbps
Wavelengths1270nm, 1290nm, 1310nm, 1330nm
Fiber TypeSingle-Mode Fiber (SMF)
Transceiver FormatQSFP28
Operating Temperature0°C to 70°C
Maximum Power Consumption3.5W
Optical ComponentsUncooled 4x25G DFB Laser
InterfaceDuplex LC Connector
Digital Diagnostic MonitoringYes, via I2C interface
ComplianceRoHS6, CE, FCC, CDRH, MSA
Housing MaterialCast Metal
Warranty3 years

This extended specification sheet should provide a more comprehensive understanding of the QSFPTEK CWDM4 transceiver’s capabilities and characteristics. From the power consumption to the interface and housing material, this information can help network engineers and administrators make informed decisions about the appropriateness of this transceiver for their specific networking needs.

The Application of 100G CWDM4

QSFP28 CWDM4 Advantages

The QSFP28 CWDM4 transceiver is especially useful in data center interconnects. It allows for efficient data transfer over a relatively long distance (up to 2km) without sacrificing speed, thus making it an ideal choice for large data centers or cloud service providers.

One of the key advantages of the QSFP28 CWDM4 is its ability to transmit multiple data streams simultaneously, which significantly improves the efficiency of data transmission. This characteristic can help organizations save on infrastructure costs, as fewer fibers are needed for the same data capacity.

Another advantage is its interoperability. The CWDM4 MSA standard is designed to enable compatibility between different manufacturers’ products, providing organizations with the flexibility to integrate devices from various vendors.

qsfp28 ir4 cwdm4


Q1. What is the primary application for the 100G QSFP28 CWDM4?

A1. The primary application for the 100G QSFP28 CWDM4 is in data center interconnects due to its high data transmission rate, long reach, and compatibility with single-mode fiber.

Q2. Can I use QSFP28 CWDM4 with multimode fiber?

A2. No, the QSFP28 CWDM4 is designed specifically for single-mode fiber use.

Q3. What is the maximum data transmission distance for the QSFP28 CWDM4?

A3. The QSFP28 CWDM4 can transmit data up to 2km.

Q4. What are the wavelengths used in the QSFP28 CWDM4?

A4. The QSFP28 CWDM4 uses four different wavelengths: 1270nm, 1290nm, 1310nm, and 1330nm.

Q5. What is the difference between CWDM4 and LR4?

A5. While both CWDM4 and LR4 are standards for 100Gbps optical links, they have distinct characteristics. The CWDM4, as detailed above, uses four channels each operating at 25Gbps over four different wavelengths for a total of 100Gbps on single-mode fiber up to 2km. The LR4, on the other hand, also operates at 100Gbps but can transmit up to 10km. However, LR4 uses more expensive components, such as cooled lasers, which makes CWDM4 a more cost-effective option for shorter distances.

Q6. Can CWDM4 and LR4 interoperate with each other?

A6. Unfortunately, no. While both CWDM4 and LR4 support 100Gbps over single-mode fiber, they operate at different wavelengths and have different reach, which makes them non-interoperable.

Q7. Why should I choose QSFP28 CWDM4 over QSFP28 LR4?

A7. QSFP28 CWDM4 is generally more cost-effective for shorter distances (up to 2km), making it ideal for data center interconnections. It offers similar performance to the LR4 at a lower cost due to its use of uncooled lasers and simpler module construction.

These FAQs should provide a clearer understanding of the 100G QSFP28 CWDM4 transceiver and its advantages over other options such as the LR4. As the demand for higher data rates continues to grow, the 100G QSFP28 CWDM4 is poised to be a go-to solution for organizations that want to optimize their network infrastructure while controlling costs.

100G QSFP28 ER4 Transceiver Introduction

The rapid advancement of network technology continues to push the boundaries of data transmission, with the 100G QSFP28 ER4 transceiver standing as a perfect example. This high-performance optical transceiver supports long-distance data communication up to 40km, serving as a vital component for large data centers, metro area networks, and other network applications that require high-speed, long-distance data transfer.

What is 100Gbase-ER4 Standard?

The 100GBASE-ER4 standard is part of the IEEE 802.3ba specification which defines Ethernet-based data communication over fiber optic cables. ER4 stands for “Extended Reach”, indicating its capacity to support data transmission distances up to 40km over single-mode fiber (SMF). This standard employs 4 wavelengths, each carrying a 25G data stream, to achieve the overall 100G data rate.

What is IEEE 802.3ba:

What Is QSFP28 ER4 Transceiver?

The QSFP28 ER4 transceiver is a high-performance optical module that operates according to the 100GBASE-ER4 standard. As the name QSFP28 (Quad Small Form-Factor Pluggable) suggests, it contains four independent optical transmitters and receivers, each capable of transmitting data at a rate of 25Gbps, contributing to the combined data rate of 100 Gbps.The 100G ER4 is operating at 4 WDM wavelength: 1295 nm, 1300nm, 1305 nm, 1310nm.

100g QSFP28 ER4

QSFP28-100G-ER4 transceivers are typically equipped with duplex LC connectors, and they incorporate advanced technologies such as SOA (Semiconductor Optical Amplifier) to support long-distance data transmission up to 40km.

The Working Principle of 100G QSFP28 ER4

The 100G QSFP28 ER4 transceiver operates by converting electrical signals into optical signals and vice versa. It consists of four channels, each transmitting data at a rate of 25Gbps. The electrical signals are first converted into laser light signals, which are then combined and sent over a single-mode fiber optic cable.

On the receiving end, the transceiver separates the combined light signal into individual wavelengths. An integrated SOA amplifier strengthens the signal before it’s converted back into an electrical signal, ready for processing by the receiving device. This way, a 100G QSFP28 ER4 transceiver can handle the transmission and reception of high-speed data over long distances without significant loss of signal quality.

QSFP28 ER4 Application

QSFP28 ER4 transceivers are commonly employed in various network applications that require long-distance, high-speed data transmission.

Metropolitan Direct Connection

In metropolitan area networks (MANs), QSFP28 ER4 transceivers serve to connect various local area networks (LANs) spread across a city or large campus. Their ability to support high-speed data transmission over distances up to 40km makes them ideal for such applications.

 Data Center Interconnect

Data center interconnect (DCI) is another prominent application area for QSFP28 ER4 transceivers. Data centers often require high-speed, reliable, and long-distance interconnections to ensure efficient data transfer and synchronization between different data centers.


FAQs related to QSFP28 ER4 often revolve around their compatibility, distance capabilities, and use cases. It’s important to note that while QSFP28 ER4 transceivers are designed for long-distance data transmission, their actual performance can depend on various factors, including the quality of the fiber optic cables used and the overall network configuration. They are compatible with devices that support the 100GBASE-ER4 standard, and their applications extend beyond metropolitan networks and data centers to include any situation that requires long-distance, high-speed data transmission.

Q: What distances can QSFP28 ER4 transceivers cover?

A: QSFP28 ER4 transceivers are designed to support distances up to 40km over single-mode fiber optic cables. However, actual distances can vary depending on the quality of the cables and other aspects of the network configuration.

Q: Can QSFP28 ER4 transceivers be used with multimode fiber?

A: No, QSFP28 ER4 transceivers are designed for use with single-mode fiber. Using them with multimode fiber would likely result in a significant reduction in transmission distance and data rate.

Q: What type of connector is used with QSFP28 ER4 transceivers?

A: QSFP28 ER4 transceivers typically use duplex LC connectors, which are widely used in fiber optic communication due to their compact size and reliable performance.

Q: Can QSFP28 ER4 transceivers work with other QSFP28 transceivers?

A: Yes, as long as the other QSFP28 transceiver supports the same data rate and the same or a compatible standard. However, it’s important to remember that the total transmission distance will be limited by the transceiver with the shortest reach.

In conclusion, the 100G QSFP28 ER4 transceiver is a robust solution for high-speed, long-distance data transmission in a variety of network scenarios. Its versatility, performance, and adherence to the 100GBASE-ER4 standard make it an excellent choice for applications ranging from metropolitan networks to data center interconnects. As network demands continue to grow, technologies like the QSFP28 ER4 will undoubtedly play a crucial role in meeting those needs.

The Power of QSFP28 PAM4: Revolutionizing Data Transmission

The growing demand for faster, more efficient data transmission has led to the development and adoption of innovative technologies like the QSFP28 PAM4. This technology, combined with 100G DWDM QSFP28 and 100G coherent transceivers, is setting new benchmarks in the data communication industry. This blog post will explore the concept of PAM4 technology, its application in 100G/400G environments, and the advantages it brings to the table.


What Is PAM4 Technology?

Pulse Amplitude Modulation with 4 levels, or PAM4, is a modulation technique that allows four different pulse amplitudes, effectively doubling the data rate transmitted over a given channel. Unlike traditional binary systems (PAM2) that utilize two levels to represent data, PAM4 employs four levels, thereby doubling the amount of information transmitted in a single operation.

How Does PAM4 QSFP28 Apply for 100G/400G Applications?

In a world where the volume of data transmission is constantly increasing, technologies like PAM4 QSFP28 play a crucial role in addressing the needs of high-speed networks, particularly in 100G and 400G applications.

Large Data Capacity

One of the significant advantages of QSFP28 PAM4 is its ability to carry large data capacities. By utilizing four amplitude levels in its data encoding process, PAM4 effectively doubles the data rate. This increase in data capacity is essential in data center interconnects (DCIs), where data needs to be transmitted and processed at incredibly high speeds.

Lower Power Consumption

Another major benefit of the PAM4 QSFP28 is its lower power consumption. Despite delivering higher performance levels and faster data rates, PAM4 technology consumes less power compared to traditional coherent technology. This feature makes it a more sustainable and cost-effective option for data centers and other large-scale network applications.

Cost Effective

The cost-effectiveness of PAM4 QSFP28 extends beyond its power consumption. PAM4-based transceivers, particularly the 100G PAM4, are cheaper than their 100G coherent counterparts, making them an ideal solution for organizations seeking to optimize their network capabilities while managing costs effectively.

100G DWDM DCI Solution

The combination of PAM4 QSFP28 with 100G DWDM provides a powerful solution for data center interconnects. The PAM4 modulation enhances the capacity and efficiency of the DWDM systems, ensuring seamless data transmission over long distances, which is a critical requirement in DCI applications. DCMs are used to correct the pulse spreading that occurs as light travels through the fiber, which can potentially impact the quality and speed of data transmission. EDFA line cards, on the other hand, amplify the optical signal to ensure that it remains strong and clear, even over long distances.

In light of the numerous benefits they offer, QSFP28 PAM4 DWDM modules have become an increasingly popular choice for a range of 100G and 400G applications. These include point-to-point data center interconnects (DCI), 100G Ethernet metro-access over DWDM, campus and enterprise links, and even 5G mobile access architecture.


QSFPTEK has emerged as a leader in providing high-quality, high-performance network solutions. QSFPTEK’s 100G DWDM QSFP28 PAM4 solution exemplifies this, offering a comprehensive solution for high-capacity data transmission needs.

80km DCI with DCM, EDFA Line Cards

QSFPTEK’s 100G DWDM QSFP28 PAM4 solution is designed to cover long distances, offering a reach of up to 80km. By leveraging Dispersion Compensation Modules (DCM) and Erbium-Doped Fiber Amplifier (EDFA) line cards, this solution ensures that data transmission remains reliable and efficient even over long distances. Embracing the advantages of embedded DWDM technology, the QSFP28 PAM4 DWDM transceivers are pluggable, allowing for direct insertion into suitable data center routers or switches. This eliminates the need for a separate DWDM converter platform, simplifying the deployment and maintenance process while also significantly reducing the overall cost.

These transceivers incorporate advanced PAM4 technology to ensure high-speed, reliable data transmission, making them a crucial element in today’s high-capacity data centers. Their compact and pluggable design facilitates efficient use of space and seamless integration with existing network equipment, thus providing considerable operational and economic advantages.

However, to fully leverage the capabilities of these PAM4 DWDM transceivers, certain additional considerations come into play, particularly when dealing with long-distance transmissions. Dispersion Compensation Modules (DCMs) and Erbium-Doped Fiber Amplifier (EDFA) line cards play a crucial role in ensuring optimum performance over longer distances.

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.