What Is The Difference Between Cat5, Cat5e, and Cat6 Cable?

00ftWhen it comes to network cabling, there are always a variety of choices. And there is no doubt that people prefer the cable with high performance and low price. In this article, we will discuss three different copper cable options—Cat5, Cat5e, Cat6. After reading, you will be much more acquainted with these cable specifications and have a better idea of what you would like to use in your network.

Overview of Cat5, Cat5e, and Cat6

First, let’s come to the overview of Cat5, Cat5e and Cat6 cables. Cat5, or Category 5, is an Ethernet network cable standard defined by the Electronic Industries Association and Telecommunications Industry Association (commonly known as EIA/TIA). Cat5 cable uses the fifth generation of twisted pair Ethernet technology and contains four pairs of copper wire supporting Fast Ethernet. Cat5e, or Cat5 enhanced, is designed to better support Gigabit Ethernet by utilizing all four wire pairs. And Cat5e cable additionally preserves backward compatibility with Fast Ethernet equipment. As the sixth generation of twisted pair Ethernet cable, Cat6 contains four pairs of copper wire and utilizes all of these pairs for signaling in order to obtain the higher level of performance—supporting 10G Ethernet. Here is a figure of the inner structure of Cat5, Cat5e and Cat6.

Inner Structure of Cat5, Cat5e and Cat6

Differences Between Cat5, Cat5e, and Cat6

This part will discuss the differences between Cat5, Cat5e and Cat6 from four aspects: speed, length, cost and application.

Speed

Data speed is important for cable selections. You have to choose the cable that is equivalent to what is running on it. As for Cat5 cable, it can handle 10/100 Mbps speed (Fast Ethernet) with bandwidth up to 100 MHz; for Cat5e cable, it can support 1 Gigabit Ethernet with bandwidth up to 100MHz; while Cat6 can support higher data rate of 10 Gigabit Ethernet with bandwidth up to 250 MHz.

Length

The common ground for Cat5, Cat5e and Cat6 cable is that they are all designed for short distance data transmission, because they are made of copper wires. Their cable runs are limited to a maximum recommended length of 100 meters (328 feet) for their nominal connection speeds—Fast Ethernet speed for Cat5, 1 Gigabit Ethernet speed for Cat5e and Cat6. At present, Cat5 cable 1000ft (305m), Cat5e cable 1000ft (305m) and Cat6 cable 1000ft (305m) are available on the market, and both of them can support 1000Mbps maximum data rate with 100MHz bandwidth.

Cost

Compared with Cat5e cables, the cost of Cat6 cables is typically 10 to 20% more expensive because of higher transmission speed. However, the cost of these cables are comparatively low, which only takes up a very small portion of the total budget once you consider all the other equipment (racks, servers, switches, routers, etc). For the consideration of your application, Cat6 might be a better choice if higher data rate is required. The additional cost can save you more money in the long run.

Application

Cat5 is often connected to patch panels, switches, routers, desktops, IP phones and many other networks and network devices that utilize the internet. And traditionally, Cat 5e cable is run for the business telephones. Cat 6 is suited for broadband video and digital video applications because of the lower signal losses and better transmission performance at higher frequency.

Conclusion

Be sure to make clear of these three types of Ethernet cables and select the suitable one for your home or business project. I hope the information in this article could be helpful or a guide for you when you are confused about which Ethernet cable to choose.

Practical Knowledge About Optical Module

With the rapid development of fiber optical technology, various optical communication products are available on the market. Optical module is a small size but important optical component in telecommunication and data communication applications. Being able to realize the photoelectric conversion, it is popular among network users and vendors. To avoid unnecessary loss when using optical modules, it is necessary to master the skill of selecting patch cable for an optical module as well as installing or removing an optical module. This passage is going to guide you how to select patch cable for optical module and install or remove optical module.

Overview of Optical Modules and Patch Cables

Before we come to the practical content, let’s learn something basic about optical modules and patch cable. Optical module is a self-contained component that can both transmit and receive signals. Usually, it is inserted in devices such as switches, routers or network interface cards which provide one or more transceiver module slot. There are many optical module types (shown in the figure below), such as SFP, X2, XENPAK, XFP, SFP+, QSFP+, CFP and so on.

Optical Modules

A patch cable is a electric or optical cable terminated with connectors on both ends. It is used to connect one electronic or optical device to another for signal routing. Optical patch cables are now widely used in data centers for data transmission. They have different connector types (shown in the figure below), like LC, SC, ST and FC, etc. They also have different fiber types, like single-mode patch cable, multimode patch cable, simplex patch cable, duplex patch cable and so on.

Optical Connectors

Selecting Patch Cable for Optical Module

There are three basic aspects that you have to consider when selecting patch cable for optical module—transmission media, transmission distance and rate as well as module interface. Transmission media can be optical fiber or copper; transmission rate will decrease as the transmission distance increases in the fiber optic cables; duplex SC and LC interfaces are usually employed, and some optical modules often use MPO/MTP interfaces. Let’s take Cisco GLC-LH-SM Compatible 1000BASE-LX/LH SFP Transceiver for example, and its detailed information is shown in the table below. From the table, we can easily find that this GLC-LH-SM 1000BASE-LX/LH SFP Transceiver can transmit and receiver data signals over SMF with LC duplex connector and operating at 1310nm wavelength. So when connecting two transceivers of this type, we are supposed to use a single-mode patch cable with LC-LC connector.

Detailed Information of Cisco GLC-LH-SM Compatible 1000BASE-LX/LH SFP Transceiver

Installing or Removing Optical Module

After knowing how to select patch cable for your optical module, let’s move on to how to install or remove optical module effectively. First, there are several warming tips about installing or removing optical module:

  • To prevent the cables, connectors and the optical interfaces from damages, you must disconnect all cables before installing or removing an optical module.
  • Remember to protect the optical modules by inserting clean dust plugs into them after the cables are removed. Avoid getting dust and other contaminants into the optical ports of your optical modules.
  • Frequently remove and install an optical module can shorten its useful life. Thus, you should remove or insert it unless it is necessary.
  • Optical modules are sensitive to static, so be sure to use an ESD wrist strap or comparable grounding device during both installation and removal.
Installing Procedure

Step 1. Attach an ESD (electric-static discharge) preventive wrist strap to your wrist and to the ESD ground connector or a bare metal surface on your chassis.
Step 2. Remove the optical module from its protective packaging.
Step 3. Check the label on the module body to verify that you have the correct module for your network.
Step 4. Align the optical module in front of the socket opening.
Step 5. Insert the optical module into the socket until the module makes contact with the socket connector.

Removing Procedure

Step 1. Attach an ESD-preventive wrist strap to your wrist and to the ESD ground connector or a bare metal surface on your chassis.
Step 2. Disconnect and remove interface cable from optical module.
Step 3. Immediately install the dust plug into the module’s optical bore.
Step 4. Slide the optical module out of the socket connector.
Step 5. Place the removed optical module into an antistatic bag.

In fact, different types of optical modules have different structures, so remember to follow the instruction when inserting them into the socket or removing then out of the socket connector.

Conclusion

Optical module, essentially completing the conversion of data signals between different media, can realize the connection between two switches or other devices. It has become the key component in today’s transmission network. Therefore, it is helpful to learn how to select patch cable for an optical module as well as install and remove an optical module, even though you are not a professional telecom engineer. I hope this passage can help you during the operation.

40G QSFP+ – A Cost-effective Transceiver Solution

Data transmission with higher density and bandwidth has become the trend under today’s networking environment. And for better network performance, the existing bandwidth has been generated to 40Gbps. Among various network devices designed for 40 Gigabit Ethernet (GbE) links, 40G QSFP+ transceivers play an important role in driving the bandwidth to a mounting point. This passage is going to focus on this cost-effective transceiver. First, let’s move on to the overview of 40G QSFP+.

Overview of 40G QSFP+ Transceiver

The 40G QSFP+ (Quad Small Form-Factor Pluggable Plus) transceiver is a compact, hot-pluggable, parallel fiber optical transceiver with four independent optical transmit and four receive channels. Each channel is able to transfer data at 10Gbps. Thus, a QSFP+ transceiver with Four high-speed channels can support data rates up to 40Gbps and it supports Ethernet, Fibre Channel, InfiniBand and SONET/SDH standards. In addition, 40G QSFP+ is primarily used in switches, routers, and data center equipment where it provides higher density than SFP+ transceiver.

Three types of 40G QSFP+ Transceiver

With the development of the SFF-8436 Multi Source Agreement, many vendors are now offering a variety of IEEE- and MSA-compliant QSFP+ devices for fiber networks. And there are three basic 40G QSFP+ transceivers for this standard: 40G LR4 QSFP+ transceiver, 40G SR4 QSFP+ transceiver and 40G LR4 parallel single mode (PSM) transceiver.

40G LR4 QSFP+ Transceiver

The 40G LR4 QSFP+ Transceiver converts 4 inputs channels of 10Gbps electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40Gbps optical transmission. Together with duplex LC connectors, 40G LR4 QSFP+ transceiver can support an optical link length up to 10 kilometers over the single mode fiber.

We can easily understand the working principle of 40G LR4 QSFP+ transceiver from the figure below. In the transmit side, four 10Gbps serial data streams at different wavelengths are passed to laser drivers. Then four data streams are optically multiplexed to a single mode fiber through LC connector. In the receive side, four 10Gbps optical data streams are de-multiplexed into four individual data streams by the optical de-multiplexer. And each data stream is collected by a PIN photodiode /TIA array and passed to an output driver.

Working Principle of 40G LR4 QSFP+ Transceiver

40G SR4 QSFP+ Transceiver

The 40G SR4 QSFP+ Transceiver provides a high-bandwidth 40G optical connection over fiber ribbon terminated with MPO/MTP connectors. Unlike the 40G LR4 QSFP+ transceiver, this kind of transceiveris used together with multi-mode fiber, supporting with a link length up to 100 meters on OM3 cable and 150 meters on OM4 cable.

We can easily understand the working principle of 40G SR4 QSFP+ transceiver from the figure below. The transmitter converts parallel electrical input signals into parallel optical signals through the use of a laser array. Then the parallel optical signals are transmitted parallelly through the multi-mode fiber ribbon. Reversely, the receiver converts parallel optical input signals via a photo detector array into parallel electrical output signals.

Working Principle of 40G SR4 QSFP+ Transceiver

40G LR4 Parallel Single Mode (PSM) Transceiver

The 40G LR4 PSM transceiver is designed with QSFP+ form factor, optical/electrical connection and digital diagnostic interface according to the QSFP+ MSA. As a highly integrated 4-channel optical module, this kind of transceiver can provide increased port density and total system cost savings. 40G LR4 PSM transceiver supports up to 10 kilometers over single mode fiber through MPO/MTP fiber ribbon connectors.

From the figure below, we can easily understand the working principle of 40G LR4 PSM transceiver which is nearly the same as that of 40G SR4 QSFP+ transceiver. The transmitter converts parallel electrical input signals into parallel optical signals and the receiver converts parallel optical input signals via a photo detector array into parallel electrical output signals. The difference is that the cable used in this link is single mode ribbon fiber cable. That’s to say, the parallel optical signals are transmitted parallelly through 8 single mode fibers.

When reading this, you may have found that both 40G LR4 QSFP+ transceiver and 40G QSFP+ PSM transceiver can support the maximum transmission distance of 10km. The obvious difference between these two transceivers is that the former establishes 40G links over 2 optical SMFs with a duplex LC connector, while the latter achieves 40G links via 8 optical SMFs with a MTP/MPO fiber ribbon connector. And we can easily find that 40G LR4 PSM transceiver costs more than 40G LR4 transceiver which uses only 2 single mode fibers to support an optical link. Besides, in the data center fiber infrastructure, the patch panel has to be changed to accommodate MTP cables, which would cost more than LC connectors and regular SMF cables.

Working Principle of 40G LR4 PSM Transceiver

Conclusion

From the introduction above, 40G SR4 QSFP+ transceiver is suitable for short-distance transmissions. So it is often used in data centers to interconnect two Ethernet switches with 12 lane ribbon OM3/OM4 cables. While 40G LR4 QSFP+ transceiver and 40G LR4 PSM transceiver are often used in long-distance transmission applications. I hope this passage can help you know more about 40G QSFP+ and choose a suitable optical transceiver module according to your need.

Learn More About SFP+ Modules

With the rapid development of network, 10 Gigabit Ethernet has been widely used in various fields. Therefore, SFP+, a kind of optical communication product which can support 10 Gigabit Ethernet, has gained much attention among data network users and vendors. Take Finisar 10G SFP+ as an example. Finisar is one of the world’s largest telecom suppliers and wins large market share with its SFP+ transceivers. The Finisar Compatible 10GBASE-SR SFP+ with 850nm wavelength and LC duplex can transmit at the data rate up to 10 Gbps. It is obvious that this kind of product meets the requirement of high transmission data rate in application. Is this the only reason why SFP+ becomes popular? The answer is “Definitely not”. This passage will guide you to learn more about SFP+ modules.

Overview of SFP+ Module

SFP+ module, or SFP Plus, is a hot-pluggable, small-footprint optical transceiver that supports data rate up to 10 Gbit/s. It also supports 8 Gbit/s Fibre Channel, 10 Gigabit Ethernet and Optical Transport Network standard OTU2. In addition, as an enhanced version of SFP module, SFP+ module is interchangeable with SFP module and can be used in the same cages as SFP module, allowing the equipment manufacturer to reuse existing physical designs for high-density port switches and modular line cards. Here is a picture of SFP+ module.

SFP Plus

Features

Besides being able to transmit at data rate up to 10Gbps, SFP+ is also characterized by other features, such as smaller in size, lower in cost and more efficient in the application.

Smaller

SFP+ modules leave more circuitry to be implemented on the host board instead of inside the module. For example, SFP+ module significantly simplifies the functionality of the 10G optical module by moving such functions as clock and data recovery (CDR), electronic dispersion compensation (EDC), 10G SERDES, and signal conditioning that traditionally resided inside the XAUI-based module into 10GbE PHY devices and line cards. As a result, the modules are smaller. The figure and table below shows the comparison between X2, XFP and SFP+.

Comparison Between X2, XFP and SFP+

Comparison Between X2, XFP and SFP+ Shown in the Table

Cheaper

From the figure and table above, we can easily find that SFP+ module form factor is 30% smaller in comparison to X2 or XFP modules. In addition, it uses less power, requires fewer components, and is less expensive than the 10-Gigabit small form-factor pluggable module (XFP) form factor, which was already smaller and used less power than the XAUI-based XENPAK and X2 form factors. Here is a table showing the price of Cisco 10Gbit/s X2, XFP, XENPAK and SFP+.

The Price of Cisco 10Gbit/s X2, XFP, XENPAK and SFP+

More Efficient

Each SFP+ module houses an optical transmitter and receiver. One end of the module is an SERDES framer interface (SFI) serial interconnect, which handles differential signals up to 10 Gbps; while the other end is an optical connection that complies with the 10GbE and 8GFC standards. SFP+ modules do only optical to electrical conversion, no clock and data recovery, putting a higher burden on the host’s channel equalization. And it has become the most popular module on 10GE systems for allowing higher port density.

Application

From the beginning of the passage, we have known that SFP+ is widely used in 10 Gigabit Ethernet applications. In fact, SFP+ module has different types to meet different requirements in the application. For example, SFP-10G-SR (shown in the figure below) uses 850 nm lasers ad it is suitable for short reach links in high-speed interconnect application. Using 2000 MHz*km MMF (OM3), it is possible to reach up to 300m link lengths; while using 4700 MHz*km MMF (OM4), it is possible to reach up to 400m link lengths. Besides SFP-10G-SR, there are many other SFP+ module types, such as SFP-10G-USR, SFP-10G-LR, SFP-10G-ER and so on. By using different wavelengths, they are separately suitable for the ultra short reach, long reach, extended reach links in applications.

SFP-10G-SR

SFP+ can also be applied to Direct Attach Cable. As a cost-effective solution for short reach 10 Gigabit Ethernet application, SFP+ Direct Attach Copper Cable, a high speed copper directly connected with two SFP+ housings on either end, is widely used in high-speed interconnect applications such as high-performance computing (HPC), enterprise networking including top-of-rack switching and network storage markets.

Conclusion

As a new generation of small-factor form, hot-pluggable optic transceiver, SFP+ has been optimized in several aspects and can meet the requirement for high transmission data rate in the applications of telecommunication equipment, data center cabling infrastructure. I hope after reading this passage, you can have a thorough understanding of SFP+ module.

Things You Must Know About DAC Cable

Fiber optic patch cable, also known as fiber jumper, is a fiber optic cable terminated with fiber optic connectors on both ends. And it is widely used in the connections between network equipment. In recent years, a kind of fiber optic patch cable which can transmit data at a high data rate with low cost is popular with data center users. That’s DAC cable or Direct Attach Cable, and this passage will focus on DAC cable’s overview, type and feature.

Overview of DAC Cable

Direct attach cable is a form of high speed cable with two connectors on either end which are in the form of optical transceiver module, such as SFP+, QSFP+ and so on, but they not real optical transceiver modules. Direct attach cable can support Ethernet, Infiniband, Fibre Channel and other protocols. And it is mainly used for the connection between switches, servers, routers in the interconnection application of racks. As a cost-effective solution in short reach applications, DAC is usually used in equipment distribution area (shown as the figure below).

Application of DAC Cable in Equipment Distribution Areas

Types of DAC Cable

Seen from the material of the cable, DAC can be classified into direct attach copper cable and active optical cable (AOC). Direct attach copper cable can either be passive or active, while AOC cable is always active. The following part will separately give an overview of passive direct attach copper cable, active direct attach cable and active optical cable.

Passive Direct Attach Copper Cable

Shown as the figure below, the connectors of passive direct attach copper cable contain no active components. The passive direct attach copper cable provides a direct electrical connection between corresponding cable ends and it can reach the transmission distance of 7m at a data rate of 10 Gbps or 40 Gbps with low power consumption.

Passive Direct Attach Copper Cable

Active Direct Attach Copper Cable

Compared with passive direct attach copper cable, the connectors of active direct attach copper cable contain active components, such as cable drive, to transmit and receive electric signals. Therefore, the active direct attach copper cable consumes more power. While these active components help to improve signal quality and provide a longer cable distance. For example, the active direct attach copper cable can reach the transmission distance of 15m at a data rate of 10 Gbps or 40 Gbps.

Active Direct Attach Copper Cable

Active Optical Cable

The material of AOC’s cable is fiber optic cable and the connectors of active optical cable contain active components, such as rear stage magnifying glass, laser driver and so on. As a result, the transmission distance of active optical cable is much longer than passive direct attach copper cable and active direct attach copper cable’s. Usually, the active optical cable can transmit signals up to 100m.

Active Optical Cable

Feature

From the content above, we can easily find that with different components inside connectors, different types of direct attach cables have different features. This part will give a detailed introduction about direct attach copper cable and active optical cable’s features.

For direct attach copper cable:

It supports higher data rates than traditional copper interfaces from 4 Gbps to 10 Gbps per channel.

It is interchangeable and hot swappable with fiber optical modules.

It is a cost-effective solution over optical transceivers and cables or short reach applications.

It supports multiple protocols, such as Gigabit & 10G Ethernet, 8G FC, FCoE, InfiniBand SDR, DDR & QDR.

For active optical cable:

It is an alternative to optical transceivers which eliminates the separable interface between transceiver module and optical cable.

Needing no equipment upgrades, it has a throughput of up to 40 Gbps with QSFP+; it weighs less than a comparable direct attach copper cable.

It is immune to electromagnetic energy because the optical fiber is a kind of dielectric (not able to conduct electric current).

Conclusion

DAC cable is a cost-effective, proven solution for interconnecting networking applications. It uses the same port as an optical transceiver, but with significant cost savings and power savings advantages in short reach applications. What’s more, the product is continuing to evolve to meet industry needs of higher data rates and densities with low power consumption.

Introduction to BiDi SFP

SFP, a compact and hot-pluggable transceiver, is popular in telecommunication and data communication. As we know, most SFP transceivers utilize two fibers to achieve the data transmission. Nowadays, more and more people realize that the cost of fiber counts accounts for a large proportion, so it is necessary to find a cost-effective solution in the communication field. As an optimized version of SFP transceiver, BiDi SFP may be a good option. The following passage will focus on the overview, connection method and application of BiDi SFP.

Overview of BiDi SFP

BiDi SFP is a compact transceiver module which utilizes WDM (Wavelength Division Multiplexing) technology. The technology is increasingly popular among telecommunication and service operators because it can mix and transmit multiple wavelengths simultaneously over same unique fiber strand. With the use of this technology, BiDi SFP is specially designed for the high performance integrated duplex data link over a single optical fiber. BiDi SFP is compliant with the SFP multi-source agreement (MSA), and it interfaces a network device motherboard (for a switch, router, media converter or similar device) to a fiber optic or copper networking cable. Here is a figure of BiDi SFP, and it can help you get a general understanding of BiDi SFP’s connection method before we move on.

Structure of BiDi SFP Transceiver

Connection Method

BiDi SFP uses only one port fitted with an integral WDM coupler, also known as diplexer. The WDM coupler can combine and separate data transmitted over a single fiber based on different wavelengths of the light. For this reason, BiDi transceivers are also referred as WDM transceivers. To work effectively, BiDi SFP must be deployed in matched pairs with the opposite wavelength together. Here is a figure to help you get intuitive understanding of this. If paired BiDi transceivers are being used to connect Device A (Upstream) and Device B (Downstream), then Transceiver A’s diplexer must have a receiving wavelength of 1550nm and a transmit wavelength of 1310nm; Transceiver B’s diplexer must have a receiving wavelength of 1310nm and a transmit wavelength of 1550nm.

BiDi SFP Connection Method

Application

At present, the BiDi SFP is usually used in FTTx deployment P2P (point to point) connection. In a FTTH deployment, optical fibers are used directly to connect the central office and the customer premises equipment. But because the use of P2P structure, the customer premises equipment has to be connected to the central office on a dedicated fiber. BiDi SFP can realize a bi-directional communication on a single fiber by using WDM. This makes the connection between central office and customer premises equipment become more simple. In addition, BiDi SFP can be also applied in WDM fast Ethernet links, metropolitan area network, and inter-system communication between servers, switches, routers, OADM, etc.

Conclusion

With the increasing demand of high density and reliability of data transmission over long distance, more and more optical communication products appear on the market. The deployment of BiDi SFP instantly doubles the bandwidth capacity of the existing optical fiber infrastructure which can be a cost-effective solution in the applications. BiDi SFP is a popular industry format jointly developed and supported by many network component vendors mainly because it saves the cost of fiber. It is certain to be the first option when choosing fiber optic transceiver applied to large data rate and long distance data transmission.

How Much Do You Know About CWDM SFP?

Have you noticed that there are some SFP modules with colorful markings on the market? For SFP, we are not unfamiliar. SFP (Small Form-Factor Pluggable) is a compact, hot-pluggable transceiver used for both telecommunication and data communication applications. But do you know why they are designed with different colors?

CWDM SFPs

These colorful SFP modules are called WDM (Wavelength Division Multiplexing) SFPs. WDM is a technology which combines two or more kinds of optical signals at different wavelengths and transmits them on a single optical fiber. By using WDM technology, SFP module can transmit signals at different wavelengths, which are identified by different colors. WDM SFPs can be divided into two basic types. One is CWDM (Coarse Wavelength Division Multiplexing) SFP, and the other one is DWDM (Dense Wavelength Division Multiplexing) SFP. The following passage is mainly about CWDM SFP.

Overview of CWDM SFP

CWDM SFP is a kind of optical transceiver which uses CWDM technology. Similar with traditional SFP module, CWDM SFP is also a hot-pluggable transceiver that interfaces a network device port (of a switch, router, media converter or similar device) to a fiber optic networking cable.

Generally speaking, CWDM SFP modules come in 8 wavelengths that range from 1470 nm to 1610 nm. Through the color markings on the devices, it is easy to identify the wavelength to which the Gigabit Ethernet channel is mapped. That is why SFP modules are designed with different colors. The following table lists the CWDM SFP modules with their wavelengths and color codes.

CWDM SFPs with with their wavelengths and color codes

In addition, CWDM SFP is a compatible transceiver which provides data rates from 100 Mbps up to 4 Gbps, and reach a transmission distance at 20 to 40km, 40 to 80km and 80 to 120km. CWDM SFP modules also feature digital diagnostics, also known as digital optical monitoring (DOM), which is supported by the majority of switch and router OEMs in their operating system software.

Application

CWDM SFP is a MSA standard build and it is designed for operations in Metro Access Rings and Point-to-Point networks using Synchronous Optical Network (SONET), SDH (Synchronous Digital Hierarchy), Gigabit Ethernet and Fiber Channel networking equipment. For it is low in cost, CWDM SFP can be regarded as a convenient and cost-effective solution for the adoption of Gigabit Ethernet and Fibre Channel (FC) in campus, data-center, and metropolitan-area access networks.

Comparison With DWDM SFP

DWDM (Dense Wavelength-Division Multiplexing) SFP transceivers are used as part of a DWDM optical network to provide high-capacity bandwidth across an optical fiber network, which is a high performance, cost effective module for serial optical data communication applications up to 4.25Gb/s. From a low cost point of view, CWDM SFP module is inexpensive than DWDM SFP. For other aspects, the key in selecting CWDM or DWDM SFP lies in the difference between CWDM and DWDM. They refer to different methods of splitting up the light. For example, CWDM uses broader spacing between channels, allowing for inexpensive SFPs, while DWDM uses denser channel spacing, which allows for more wavelengths to be used on a single fiber. DWDM is typically used in large optical networks over longer distance. Therefore, DWDM SFP module is the ideal choice for SFP modules over long distance and with better scalability.

Conclusion

Data communication and fiber optical network develop rapidly. During the process, some problems occur which push forward the improvement of the products. SFP modules, essentially just completed the converted of data between different media, can realize the connection between two switches or computers within a long distance. CWDM technology is an effective way to meet the rapidly increasing demand of bandwidth in transmission network, and it can provide a cost-effective solution for high capacity in metropolitan area network and local area network. As a functional and economical optical communication product, CWDM SFP, combined with the advantages of them, becomes more and more popular with users and applied to various fields.