Posted in Modules

Cisco 40G QSFP Datasheet

As a worldwide leader in networking, Cisco is noted for its networking hardware and telecommunication equipment. With the uprising of 40 Gigabit Ethernet network, 40G optics would be large in demand. This article would comprehensively present the Cisco QSFP Datasheet.

Overview on Cisco 40G QSFP Modules

As the definition of 40G QSFP modules is known to most of the people, so we would mainly introduce distinctive features of the Cisco 40G QSFP modules. They are interoperable with other IEEE-compliant 40GBASE interfaces where applicable. And the high-speed electrical interface compliant to the IEEE 802.3ba standard. All the Cisco 40G QSFP+ modules were certified and tested for superior performance, quality, and reliability. So the customers could rest assured to plug these hot-swappable input or output device into the 40 Gigabit Ethernet ports.

40G QSFP modules

Nowadays, they have been widely applied to data center, high-performance computing networks, enterprise core and distribution layers, and service provider applications. Basically, there are totally 7 form factors of Cisco 40G QSFP modules. Owing to time and space limitation, we would briefly introduce QSFP-40G-SR4, QSFP-40G-LR4, QSFP-40G-ER4, QSFP-40G-PLRL4, and QSFP-40G-CSR4.

Cisco QSFP-40G-SR4 Datasheet

The Cisco 40GBASE-SR4 QSFP modules enable high-bandwidth 40G optical links over 12fiber parallel fiber terminated with MPO/MTP multifiber female connectors. They support link lengths of 100 m and 150 m by using OM3 and OM4 multimode fibers respectively. The Cisco QSFP-40G-SR4 datasheet is shown as below:

Cisco QSFP-40G-SR4 Datasheet

Cisco QSFP-40G-LR4 Datasheet

The Cisco 40GBASE-LR4 QSFP module supports link lengths of up to 10 km over singlemode fiber with duplex LC connectors. The Cisco QSFP-40G-LR4 datasheet is shown as below:

Cisco QSFP-40G-LR4 Datasheet

Cisco QSFP-40G-ER4 Datasheet

The Cisco 40GBASE-ER4 QSFP module supports link lengths up to 40 km over singlemode fiber with duplex LC connectors. The Cisco QSFP-40G-ER4 datasheet is shown as below:

Cisco QSFP-40G-ER4 Datasheet

Cisco QSFP-40G-PLRL4 Datasheet

The Cisco 40GBASE-ER4 QSFP module supports link lengths up to 1.4 km over singlemode fiber with MPO/MTP connectors. The QSFP-40G-PLRL4 datasheet is shown as below:

Cisco QSFP-40G-PLRL4 Datasheet

Cisco QSFP-40G-CSR4 Datasheet

The Cisco 40GBASE-ER4 QSFP module supports link lengths up to 400 m over OM4 multimode fiber with MPO/MTP connectors. The Cisco QSFP-40G-CSR4 datasheet is shown as below:

Cisco QSFP-40G-CSR4 Datasheet


40G optical transceivers account for a large share on 40G Ethernet optics’ market, which are paramount for data centers, enterprises and etc. For the Cisco 40G optical modules, FS.COM will be a good choice with good compatibility, support offerings and great reputation. All of our optical modules are strictly tested to ensure 100% compatible with the Cisco, Juniper, HP and other major brands. For more details, please visit our website


Posted in Modules

Why MSA Standard Is So Important for QSFP Transceiver?

When we are selecting some optics for our switches and servers, the MSA (Multi-Source Agreement) standard always come first in our mind. No matter the optical transceiver are made by some major brands, such as Cisco, Juniper, Brocade, HP, or by third-party manufacturers, they all emphasis MSA compatibility. With the upgrading of Ethernet network, more and more Ethernet users turn their eye on 40G optics, 40G optical transceivers in particular. So why MSA standard is so important for QSFP transceiver? This article would provide a satisfied answer for you.

About MSA standard

MSA is a standard to normalize the networking equipment among competing industry manufacturers, such as Ethernet switches, routers, servers and etc. All optic transceivers are manufactured to comply with MSA standards. All elements of fiber optic transceivers are specified by a MSA agreement, including the mechanical and electrical interface.

MSA standard

40G QSFP Specification

There are many common types of 40G QSFP transceiver, such as 40G QSFP SR4, LR4, PRLR4, CSR4, and etc. We would choose 40GBASE-SR Bi-Directional QSFP transceiver to illustrate. It is a Four-Channel,Pluggable, LC Duplex, Fiber-Optic QSFP+ Transceiver for 40 Gigabit Ethernet Applications. This transceiver is a high performance module for short-range duplex data communication and interconnect applications. It integrates four electrical data lanes in each direction into transmission over a single LC duplex fiber optic cable. Each electrical lane operates at 10.3125 Gbps and conforms to the 40GE XLPPI interface. It conforms to the QSFP MSA standards. The following figure is serveral types of 40G QSFP transceiver.

40G QSFP transceivers

Why MSA Standard Is So Important for QSFP Transceiver?

For this question, we would clarify it from four aspects—cost, security and issurance as well as wide selection.


MSA standards brought great changes to optical transceiver market, it is no more monopolized by some certain major manufactures. In this way, customers have more choices for their optics over the competitive price. Moreover, customers could save more costs by purchasing their ideal optical transceivers with high quality but low costs.

—Security and Issurance

The QSFP MSA standards guarantee that QSFP modules are identical in form factor and functionality to the equivalent Cisco QSFP modules and meet the requirements of all networking equipment brands that follow the MSA standards.

—Wide selection

Using third-party, MSA compliant QSFP optical transceivers offer all the benefits of the name-brand product, but offer more selection and competitive pricing. This means that you can find a supplier who focuses on having the right product available at all times and at a fair price. Sounds like a win-win right?


Through this article, we cleared at MSA standard, 40G QSFP transceiver specification, and reasons of the importance of MSA standards to QSFP transceivers. Remember to select MSA certified products when looking to replace QSFPs to avoid losing valuable warranty coverage. Besides, if you are looking for some QSFP transceivers specified by MSA, you can take FS.COM into consideration. All of our optical transceivers are 100% ensured to apply to MSA standards, you can rest assured to use them. For more details, please visit our website.


Posted in Modules

Zero Cost—40G Migration with QSFP BiDi Transceiver

As the fast development of Gigabit Ethernet, 10Gbps cannot satisfy the users anymore, especially for some medium and large enterprises. Traditionally, it would cost a lot to update your network. It refers to a large range of things—cables, transceivers, switches and etc. But now, it would not be a problem with innovative 40Gbps Quad Small Form-Factor Pluggable (QSFP) bidirectional (BiDi) technology. That allows reuse of reuse of existing 10Gbps fiber infrastructure for 40Gbps connections. We would give further explanation and demonstration in the following passage.

40G QSFP transceiver with Cisco switch

Figure1: 40G QSFP BiDi transceiver in Cisco Switch

Why Standard QSFP Transceivers Are Not Good Options?

We would basically clarify this part from the aspect of connectors and fiber strands.


10G SR SFP+ and 40G QSFP SR transceivers use basically different connectivity formats. 10GBASE SR transceivers transmit data over mutimode fiber with LC connectors while 40GBASE SR4 transceivers over ribbon mutimode fiber with MPO connectors. As a consequence, 40G MPO-based SR4 transceivers cannot reuse aggregation fiber infrastructure built for 10G connectivity. That means we need to redesign and replace the fiber cabling infrastructure.

—Fiber strands

10GBASE SR transceivers require 2 fiber strands per 10Gbps link while 40GBASE SR4 transceivers require at least of 8 fiber strands, and often 12 fiber strands in practice. The reason for this requirement is that 40G SR4 use 4 parallel fiber pairs (8 fiber strands) at 10Gbps each for a total of 40Gbps full duplex, as shown in Figure 2. The 40G transceivers use MPO-12 connectors terminated with 12-fiber ribbons. In this way, 4 fiber strands in each connection are unused and wasted.

Principles of 40G QSFP transceiver

Figure2: Principles of 40G QSFP transceiver

Why Use QSFP BiDi Transceiver for 40G migration?

The 40G QSFP BiDi transceiver is a pluggable optical transceiver with a duplex LC connector interface for transmission within short distance over multimode fiber. It transmits fully duplex 40G data via OM3 or OM4 multimode fiber cable with one duplex LC connector. This makes it easier to reuse 10G fiber infastructure to migrate 10G to 40G network. In this way, the data center operators could make 10G to 40G migration without making ant changes to the previous 10G fiber cable plant. It offers a compelling solution that enables reuse of their existing 10G duplex multimode infrastructure for migration to 40G Ethernet connectivity.

Principles of 40G QSFP BiDi transceiver

Figure3: Principles of 40G QSFP BiDi transceiver

The 40G QSFP BiDi transceiver consists of two 20G transmit and receive channels in the 832-918 nanometer wavelength range, each transmitted and received simultaneously over two wavelengths on a single multimode fiber strand. As a consequence, an aggregated duplex 40-Gbps link can be achieved over a multimode duplex LC-terminated fiber cable. The link lengths of 40G QSFP+ transceiver can be up to 100 and 150 meters respectively on laser-optimized OM3 and OM4 multimode fiber.

>How Money Saved with 40G QSFP BiDi Transceiver for 40G Upgrading?

In the following part, we would take Cisco QSFP BiDi transceiver as an example to demonstrate costs saved by using the module in data center networks. We would show you how the cost saved by the BiDi transceiver for migrating 10G to 40G network.

As is known to all, networking devices can be directly connected with fiber cables. This direct connection design can be used to connect devices within short distance in an unstructured cabling system. Direct connection between two 40G transceivers can be provided by multimode cables with either QSFP SR4 or QSFP BiDi transceivers at two ends, just shown as the following figure.

40G direct connection

Figure4: 40G direct connection

The Cisco QSFP BiDi transceiver uses LC connectors while QSFP SR4 uses MPO-12 fiber connectors. None of the existing 10G multimode cables can be reused with QSFP SR4 transceivers, because the two connectors are completely not matched at all. With Cisco QSFP BiDi transceiver, the cable can be reused for the same type of connectors. As a result, it would bring zero-cost cabling migration from direct 10Gbps connections to direct 40Gbps connections. Therefore, in comparison to QSFP SR4 transceivers, Cisco QSFP BiDi transceivers reduce costs by 100 percent.


40G QSFP BiDi transceiver provides the most cost-effective solution for 10G to 40G network migration. By transmitting full-duplex 40 Gigabit Ethernet over a duplex multimode fiber, it helps enable seamless 10 to 40 Gigabit Ethernet migration over your 10 Gigabit Ethernet fiber infrastructure in a zero cost cabling. If you need 40G QSFP transceivers, you can take FS a try. We offer not only the mentioned QSFP SR4, QSFP BiDi transceivers, but the many other standard 40G QSFP transceivers with high quality but low cost. For more details, please visit our website.

Posted in Modules

Choosing the Right Cisco Compatible SFP Transceivers for Your Network

Choosing a right compatible optical transceiver just like choosing a specific wand by a wizard in Harry Potter—the consequences of using the wrong one can result in some serious irreparable loss. Thus, it is paramount to choose a right compatible optical transceiver for your network switch. Selecting the right optical module can save you more time and money to plan out your network’s future. This article would provide a solution about how to choose the right Cisco compatible SFP transceivers for your network.

About Cisco Compatible SFP Transceivers

A complete network system includes many components, such as servers, racks, cabinets, etc, the small form-factor pluggable (SFP) optical transceiver is indispensable in the whole network setup. SFP transceivers are hot-swappable and have the capability to allow design modification until the final stages of manufacturing. This makes it easier to accommodate different connector interfaces. SFP transceivers also have a higher optical reliability and will permit higher soldering temperatures. They are recommended by fiber optic component providers to ensure proper data transmission.


As a worldwide leader in IT and networking, the Cisco SFP optical transceivers are really costly, which brought much trouble when you budget your money on network deployment. Fortunately, there is an alternative: Cisco compatible SFPs. The Cisco compatible SFP transceivers can be used in campuses, data centers and metropolitan area access networks for Gigabit Ethernet and Fiber Channels as it is a commendable and cost-effective option.

Two Major Things to Consider When Looking at Cisco Compatible SFPs:

Before you start searching for a Cisco compatible SFPs, you should ask yourself, “What type of SFP transceivers do I need?” In this occasion, you should take your existing network equipment into consideration, the crucial thing is that the parameters of your switch port, which refers to number, type, density and etc. If you intend to improve and upgrade your network efficiency but have no idea about the detailed approach, you can ask advice from a trusted networking vendor.


Although the form factor isn’t that large, the role it plays cannot be ignored—SFPs are the workhorses of a network system, and you can find one for every job. Because they provide a wide range of inputs beyond those provided by a switch on its own. The main advantage of a Cisco compatible SFP lies in its scalability, which reduce needless bother for a full-on upgrading of your network switch. In this way, a lot of money can be saved for your network deployment.

—A trusted vendor

Over the years, the third-party vendors of optics just emerge as the pouring water. A trusted and reliable vendor seems hard to find facing so many optic’ vendors on the market. So how do you find a trusted vendor?


First off, you want to ensure that any Cisco compatible SFPs you purchase will actually be compatible and are made with quality raw materials. Secondly, you need to investigate the most optimal third-party vendor for yourself. The approaches vary: you can submit your question to several professional forums about networking, such as Cisco support community, SNB forums, network engineering stack exchange…You could receive professional replies and solutions from there. After that, you need to compare price of the several third-party vendors with a purpose to select a most appropriate one for yourself. Last but not least, when you make up your mind the final optics vendor to go, the final factor you should consider is product warranty. A good vendor is willing to provide you with a guaranteed long-term warranty. Bad quality products typically have short-term warranties because a vendor knows they won’t last as long.

FS.COM’s Compatible Cisco SFPs

According the last paragraph, we clearly know the importance of selecting a reputable third-party vendors. It is true that there is a certain amount of such vendors on the market, but it is not so easy to find products from such an optics’ vendor with much preference in terms of cost. FS.COM (Fiberstore) is a leading manufacturer and supplier of fiber optic subsystems, components and solutions. All of our optical transceivers are tested and 100% compatible to switches of many major brands, like Cisco, Juniper, Brocade, Arista, etc. You can rest assured to buy our products. If you are interested in any of our products, please feel free to contact us.

Posted in Modules, MTP/MPO cable

Cable Specifications&Deployment for QSFP28 Transceivers

100G QSFP28 transceivers have currently been highly favored by Ethernet users and been widely applied to the data centers. The QSFP28 transceivers that are supported on Ethernet network devices use fiber optic cables and connectors. The type of connector and the type of fiber depend on the transceiver type. To make sure right connectivity, it is of necessity to know the appropriate patch cable and connectors for QSFP28 transceivers. This article would introduce the cable and connector specifications and deployment as well as some precautions for QSFP28 transceivers.

100G Switch

Cable Specifications for 100G QSFP28 Transceivers

12-Ribbon patch cable with MPO connectors and LC duplex patch cable are two common fiber optic patch cables connected with 100G QSFP28 transceivers to achieve 100G Ethernet network connectivity. A 12-fiber ribbon cable can be used in outside plant applications or inside buildings when covered with flame-retardant outer jackets. LC duplex patch cable uses for specific 100G transceivers, such as 100GBASE LR4, 100GBASE CWDM4 and etc. The 100GBASE SR4 transceiver supports maximum data links up to 100 m through MTP-12 patch cables. By using LC duplex patch cable, the transmission distance of 100GBASE-LR4 can arrive 10 km.

Deployment for 100G QSFP28 Transceivers

You can use 12-Ribbon Patch cable with MPO connectors to connect two transceivers of the same type—for example, 100GBASE-SR4-to-100GBASE-SR4 or 100GBASE-PSM4-to-100GBASE-PSM4. That is to say, you can choose a MTP trunk cable together with the 100GBASE-SR4 QSFP28 module for direct 100G connection. The following picture shows two 100GBASE-SR4 QSFP+ transceivers connected by a multimode 12-fiber MTP trunk cable.

100G Dirct Connection(1)

As we mentioned above, you can also use SMF patch cables with LC duplex connectors to connect two supported transceivers of the same type—for example, 40GBASE-LR4-to-40GBASE-LR4 or 100GBASE-LR4-to-100GBASE-LR4. The SMF patch cable is one fiber pair with two LC duplex connectors at opposite ends. You can simply plug the LC duplex connectors into the corresponding duplex ports of 100GBASE-LR4, 100GBASE-CWDM4 and etc. 100G direct connection is just achieved by LC duplex patch cable connected with two same 100GBASE-LR4 transceivers, presented in the below figure.

100G Direct Connection(2)

Notes And Cautions:

1.Ensure that you order cables with correct polarity. The multifiber push-on (MPO) connectors on the 12-ribbon cables must be key-up (sometimes referred to as latch up, Type B, or Method B). If you are using patch panels between two QSFP28 transceivers, ensure that the proper polarity is maintained through the cable plant.

Cautions and Warnings

2. Ensure that the fiber end in the connector is finished correctly. Physical contact (PC) refers to fiber that has been polished flat. Angled physical contact (APC) refers to fiber that has been polished at an angle.

3. Caution: Use only a properly constructed, shield cable to ensure correct connectivity.


100G QSFP28 modules is an inevitable choice for Ethernet connectivity with a purpose to suit the future Ethernet network upgrading and higher bandwidth. 12-fiber MTP patch cable and LC duplex patch cable are used for connecting different 100G transceivers with different ports respectively. Moreover, there are something you need to keep in mind in case of causing unnecessary losses and incidents. If you intend to upgrade your network to 100G network, you can take FS.COM for a try. Here, we provide the above optical transceivers and fiber optic patch cables with high quality but low costs. If you need any of our products, please feel free to contact us.

Posted in Modules, Switch

AgilePorts—An Unique Design for Connection on Arista 7150S-64 Switch

In order to meet the requirements of demanding environments such as ultra low latency financial ECNs, HPC clusters and cloud data centers, Arista launched a series of switch—Asita 7150S, including 7150S-24, 7510S-52 and 7510S-64. The Arista 7150S series represents the industry’s leading ultra low latency 1RU 1/10/40GbE layer 2/3/4 wire speed switch family. As one member of the Arista 7150S family, Arista 7150S-64 switch has both SFP+ and QSFP+ ports while the another two haven’t QSFP+ ports. This article would provide the basic information about Arista 7150S-64 switch and its network migration with Agile ports.

An overview on AgilePorts

The most distinctive feature of Arista 7150S switch is the design of AgilePorts on the switch which enables flexible deployment. AgilePorts deliver complete flexibility in connectivity—each SFP+ interface is capable of supporting 100M-10G over a variety of media, including DWDM with distances up to 80 km. The AgilePorts feature also enables groups of adjacent SFP+ ports to be configured for 40Gb operation using 10G transceivers and cables providing maximum port flexibility and a seamless migration from 10Gb to 40Gb.

Information About Arista 7150S-64

The Arista 7150S-64 has 48 SFP+ and 4 QSFP+ ports, you can see the detailed information in the below table. Different from the other two 7150S switches, 7150S-64 has the largest number port and it is the only one has QSFP+ ports. The SFP+ ports can support 1G and 10G operation and also 100Mb support with 100/1000-TX transceivers. On this 7150S-64 switch with QSFP+ ports, you can split the 40G interfaces into 4×10G. The 7150S-64 switch can provide 16×40G interfaces including 4 QSFP+ ports and 12×40G ports (48 SFP+ ports grouped into 12×40G) (see figure1).

Arista 7150S-64 Switch
Description 7150 Switch 48-Port SFP+ 4 QSFP+
Total Ports 64
SFP+ Ports 48
L2/3 Throughput 1.28 Tbps
L2/3 PPS 960 Mpps
Latency 380ns
Typical Power Draw 224 W

Table1: Information about Arista 7150S-64 Switch

7150s-64 switch

Figure1: Rear view on Arista 7150S-64 Switch

Compatible Optical Modules for Arista 7150S-64 Switch

There are many compatible 10GbE SFP+ transceivers for 7150S-64, such as 10GBASE-SR, 10GBASE-LRL, 10GBASE-CR, and so on. You can just plug these SFP+ transceivers into the SFP+ port on the switch. For the QSFP+ ports, there is a wide range of choices as well, including 40GBASE-CR4, 40GBASE-SR4, 40G-PLRL4, 40GBASE-LR4 and etc. The distances can be supported from 100 m over OM3 to 10 km over single-mode fiber on the 7150S-64 switch.

Two Different Connection Solutions

We would mainly compare the common practice of connection with connection with AgilePorts to highlight the key distinction of connection with AgilePorts.

General Connection From 10G to 40G Network

For any network migration, optical transceivers play an essential role. So does the 10G to 40G network migration—you must take 40G QSFP+ transceiver into consideration. If you use the general switches to migrate 10G to 40G network, you can take the following connection solution as a reference. Just as we see in the below picture, an MPO/MTP LGX cassette connects four 10G SFP+ links. And then a Type-B female MPO/MTP trunk cable is used to connect the cassette and 40G QSFP+ Transceiver.


Figure2: 10G to 40G solution (1)

Connection With AgilePorts on Arista 7150S-64

Like we described before, the Arista 7150S switch’s AgilePosts is designed to address device and cabling life cycles, you can upgrade from 10GbE to 40GbE only with just 10G SFP+ transceivers and cables. It provides maximum port flexibility and a seamless migration. Under this situation, 40G QSFP transceiver is unnecessary. 40G connection is achieved by connecting four 10GBASE-SR SFP+ transceivers with LC duplex fiber patch cables. In this way, time and space are saved through this kind of connection.


Figure3: 10G to 40G solution (2)


The Arista 7150S-64 is a 10/40G Ethernet switch, the distinctive design of AgilePorts on the switch plays a prominent role on the network data rate migration from 10G to 40G. If you need 40G optical transceiver for 10G to 40G migration, FS.COM is a good choice. Recently, we have a slump on 40G QSFP SR4 and 100G QSFP28 SR4, buy a 40G QSFP SR4 transceiver only needs $49 at FS.COM. If you choose to use the Arista 7150S-64 with AgilePorts to connect, we also offer large and in-stock Arista compatible 10G SFP+ transceivers. If you need any of our products, please feel free to contact us.


Posted in Modules

How to Install a QSFP28 Transceiver

In recent years, QSFP28 transceivers have been highly favored by many Ethernet users. The modules are hot-swappable input/output (I/O) device that connect the system’s module port electrical circuity with either a copper or a fiber-optic network. Transceiver installation attaches great importance to the whole Ethernet connectivity. This article provides the installation tips of 100 Gigabit QSFP28 optical transceivers.

Information About QSFP28 Transceiver

100 Gigabit (QSFP28) transceiver module is a hot-swappable, parallel fiber-optical module. The interconnect offers four channels of high-speed differential signals with data rates ranging from 25 Gbps up to potentially 40 Gbps, and will meet 100 Gbps Ethernet (4×25 Gbps) and 100 Gbps 4X InfiniBand Enhanced Data Rate (EDR) requirements. These channels can terminate in another 40G QSFP+ transceiver. The QSFP+ transceiver connects the electrical circuity of the system with an optical external network.

The following figure shows the 100G QSFP28 SR4 transceiver. The transceiver is used primarily in short reach applications in switches, routers and data center equipment where it provides higher density than SFP+ modules.


Figure1: 100G QSFP28 SR4 transceiver

Required Tools and Equipment

To install the 100G QSFP28 transceiver, you need the following tools :

    • Wrist strap or other personal grounding device to prevent ESD occurrences.
    • Antistatic mat or Antistatic foam to set the transceiver on.
    • Fiber-optic end-face cleaning tools and inspection equipment.
Installing 100G QSFP28 Transceiver

The QSFP28 transceiver can have either a bail-clasp latch or a pull-tab latch. Installation procedures for both types of latches are provided.

Caution: The QSFP28 transceiver is a static-sensitive device. Always use an ESD wrist strap or similar individual grounding device when handling QSFP28 transceivers or coming into contact with system modules.

Installation Steps:

Step1: Attach an ESD wrist strap to yourself and a properly grounded point on the chassis or the rack.

Step2: Remove the QSFP28 transceiver from its protective packaging.

Step3: Check the label on the QSFP28 transceiver body to verify that you have the correct model for your network.

Step 4: For QSFP28 transceiver, remove the optical bore dust plug and set it aside.

Step 5: For QSFP28 transceiver equipped with a pull-tab, hold the transceiver so that the identifier label is on the top.

Step 6: For QSFP28 transceiver equipped with a bail-clasp latch, keep the bail-clasp aligned in a vertical position.

Step 7: Align the QSFP28 transceiver in front of the transceiver’s socket opening and carefully slide the QSFP28 transceiver into the socket until the transceiver makes contact with the socket electrical connector (see the figure below).

Installing QSFP28 Transceiver Module

Figure2: Installing QSFP28 Transceiver Module (Optical Transceiver Equipped with a Bail-Clasp Latch Shown)

Step8: Press firmly on the front of the QSFP28 transceiver with your thumb to fully seat the transceiver in the module’s transceiver socket (see the below figure).

Caution: If the latch is not fully engaged, you might accidentally disconnect the QSFP28 transceiver.

Seating the 100G QSFP28 transceiver module

Figure3: Seating the 100G QSFP28 transceiver module (Optical Transceiver Equipped with a Bail-Clasp Latch Shown)

Step9: For optical QSFP28 transceiver, reinstall the dust plug into the QSFP28 transceivers optical bore until you are ready to attach the network interface cable. Do not remove the dust plug until you are ready to attach the network interface cable.


Through this passage, we are clear the basic installation procedures of 100G QSFP28 transceivers and please keep the cautions and tips in mind in case of accident. If you need any of 100G QSFP28 transceiver, FS.COM is a good choice. Here, we provide large and in-stock 100G QSFP28 transceivers with low cost but high quality. Besides, our products can be shipped free right now to USA, Canada and Mexico. If you are interested with our products, please feel free to contact us.

Posted in DAC/AOC cable, Modules, Switch

How to Connect Optics for Arista 7250QX-64 Switch

In the previous post “Compatible Optics for Arista 7250QX-64“, we are clear that the features and compatible direct attach cables and optical modules of the Arista 7250QX-64 switch. But how to make the right connection? Is there anything to notice before and in the process of installation? This article would provide a satisfying solution for you.

Connecting a QSFP+ DAC Cable to Arista 7250QX-64

The proper connectivity procedures and some installation notes are very essential for connection between DAC cable and the switch. The detailed information are just below.

The connectivity steps:

1. If the QSFP+ DAC cable connector is covered with a rubber safety cap, remove the cap. Save the cap.

2. Check the port on the switch and make sure the right connectivity. If you choose 40G QSFP+ to QSFP+ DAC cable for connectivity, please make sure that is a 40G port.

3. Insert the cable connector into the switch port.

DAC cable to switch-connection

Figure1: Connecting a DAC cable to a switch

4. Secure the cables so that they do not support their own weight. Place excess cable out of the way in a neatly coiled loop. Placing fasteners on a loop helps cables maintain their shape.

Warnings and Cautions

1. Before you begin connecting the QSFP+ DAC cables to the switch, ensure that you have taken the necessary precautions for safe handling of lasers.

2. Do not bend the QSFP+ DAC cables beyond their minimum bend radius. An arc smaller than a few inches in diameter can damage the cables and cause problems that are difficult to diagnose.

3. Do not let the DAC cables hang free from the connector.

4. Do not allow fastened loops of cables to dangle, which stress the cables at the fastening point.

Installing a QSFP+ transceiver in Arista 7250QX-64

There are many QSFP+ transceiver types supporting Arista 7250QX-64, including QSFP-40G-SR4, QSFP-40G-XSR4, QSFP-40G-PLRL4, QSFP-40G-LRL4, QSFP-40G-PLR4, QSFP-40G-LR4, and QSFP-40G-ER4. Before you begin installing one QSFP+ transceiver in an Arista 7250QX-64 switch, ensure that you have a rubber safety cap available to cover the transceiver. And to prevent electrostatic discharge (ESD) damage to the transceiver, do not touch the connector pins at the ends the transceiver. Figure 2 shows how to install a QSFP+ transceiver.

Optical transceiver-switch connection

Figure 2: installing a QSFP+ transceiver in a switch

Installation steps:

1. Remove the transceiver from its bag.

2. Check to see whether the transceiver is covered with a rubber safety cap. If it is not, cover the transceiver with a rubber safety cap.

Warning: Do not leave a QSFP+ transceiver uncovered except when inserting or removing a cable. The rubber safety cap keeps the port clean and prevents accidental exposure to laser light.

3. If the port in which you want to install the transceiver is covered with a dust cover, remove the dust cover and save it in case you need to cover the port later. If you are hot-swapping a transceiver, wait for at least 10 seconds after removing the transceiver from the port before installing a new transceiver.

4. Using both hands, carefully place the transceiver in the empty port. The connectors must face the switch chassis.

Caution: Before you slide the transceiver into the port, ensure that the transceiver us aligned correctly. Misalignment might cause the pins to bend, making the transceiver unusable.

5. Slide the transceiver in gently until it is fully seated.

6. Remove the rubber safety cap when you are ready to connect the cable to the transceiver.


From the above passage, we may observe that it is not difficult to connect QSFP+ DAC cables or QSFP+ transceiver to the Arista 7250QX-64 switch. Whether you are using DAC cables or QSFP+ transceivers to make connectivity, please remember that do not look directly into a optical transceiver or into the ends of the DAC cables, the laser light may damage your eyes. FS.COM offers large and in-stock Arista 40G QSFP+ DAC cables as well as 40G QSFP+ optical transceivers. If you need any of our products, please feel free to contact us.

Posted in DAC/AOC cable, Modules, Switch

Compatible Optics for Arista 7250QX-64

In order to meet the ever-growing need for dense 10 and 40 Gigabit Ethernet switching, Arista launches the 7250X Series switches to support a flexible combination of 10G and 40G in a compact form factor to accommodate both east-west traffic patterns and support the requirement for low latency and power efficiency in dense servers farms. Among the 7250X Series, the Arista 7250QX-64 switch has been highly favored by many Ethernet users due to its low latency, high power efficiency and high performance. The detailed information about the Arista 7250QX-64 switch and its compatible optics will be mainly covered in the following passage.

Features of Arista 7250QX-64

The Arista 7250QX-64 combines low latency, and a shared packet buffer pool of 12MB per group of ports that is allocated dynamically to ports that are congested. With 64 QSFP+ ports the 7250QX-64 is a dense 40GbE or 256 × 10GbE of wire speed performance in a 2RU system. Here are some highlights of this switch:

  • Built-in storage.
  • Resilient control plane.
  • Cloud networking ready.
  • Data center optimized design.

Arista 7250QX-64

The above figure shows Arista 7250QX-64 switch’s 64 QSFP+ ports supporting 64 × 40GbE or 256 × 10GbE.

Compatible Optics for Arista 7250QX-64 at FS.COM

The Arista 7250QX-64 supports a full rang of 10 and 40 Gigabit Ethernet connectivity options. Those 10G/40G ports support installation of SFP+ and QSFP+ modules. FS.COM provides many high-quality compatible 40G QSFP+ DAC cables and 40G QSFP+ modules for Arista 7250QX-64. You can see it clearly in the following tables.

40G QSFP+ Direct Attach Cables

Description of 40G QSFP+ DAC

From the above statement, we are clear that the Arista 7250QX-64 switch has 64 QSFP+ ports, so you can directly connect “transceivers” on the two ends of the DAC cables to the corresponding port on the switch. For transmission distance over short distance, you can choose 40G QSFP+ DAC cables to make network connectivity. By using 40G breakout cable, you can just plug the one end of 40G QSFP+ copper direct attach cable into the 40G QSFP+ ports and plug the other ends of the DAC cable into four 10G SFP+ ports. Besides, you can also connect the two ends of 40G QSFP+ DAC cable with the 40G QSFP+ ports directly to make connectivity on the Arista 7250QX-64 switch. When the transmission distance is longer, 40G QSFP+ AOC cable is a good option to transfer data. Like the 40G QSFP+ DAC cable, you can plug the two ends of 40G QSFP+ AOC cable into the QSFP+ ports on the Arista 7250QX-64 switch. Those 40G QSFP+ DAC and AOC cables are suitable for short distance and ideal for high cost-effective connectivity to your Arista 7250QX-64 switch.

40G QSFP+ Optical Transceivers

As we can see from the above figure, there are many 40G QSFP+ modules available to the Arista 7250QX-64 switch. By using 40GBASE-SR4 QSFP+ transceiver, the maximum distance can be up to 40 km via single-mode fiber on the switch. Through 40GBASE-XSR4 QSFP+ module, link lengths on 7250QX-64 switch can arrive 300 m and 400 m, respectively, on laser-optimized OM3 and OM4 multimode fibers. FS.COM offers the above 40G QSFP+ optical transceivers, which is of compatibility and performance. In addition, all of FS.COM’s optical transceiver are tested for 100% functionality and guaranteed compatible for outstanding network performance.


The Arista 7250QX-64 is designed for high availability, low latency and high power efficiency, which provides a better solution for 10G/40G Ethernet network connectivity. FS.COM offers large and in-stock Arista 40G QSFP+ DAC cables as well as 40G QSFP+ optical transceivers with low cost but high quality. Besides, our products are free shopping right now in USA, Canada and Mexico. If you need any of our products, please feel free to contact us.