QSFP-40G-SR-BD Transceiver: An Ideal Option for 40G Ethernet


The demands for higher bandwidth, larger capacity and greater performance in the network are still increasing fiercely. Hence, the migration from 10G to 40G has become a significant and inevitable option for network service providers. Well, this article will recommend an ideal option for you to get 40G Ethernet: QSFP-40G-SR-BD.

QSFP-40G-SR-BD Transceiver Overview

QSFP-40G-SR-BD transceiver, known as a type of QSFP 40-Gbps BiDi transceiver, is a standard QSFP+, MSA compliant optical transceiver. It is designed to work at the wavelength from 832 nm to 918 nm and has a duplex LC interface. What’s more, QSFP-40G-SR-BD transceiver supports the transmission distance of 100m and 150m over a laser-optimized OM3 or OM4 multi-mode fiber (MMF). So this module is commonly used for short-reach data communication.


Figure1: QSFP-40G-SR-BD

Operational Principle of QSFP-40G-SR-BD Transceiver

Bidirectional Optical Sub-Assembly (BOSA) technology is now available that allows components to both transmit and receive optical signals at the same time. By using BOSA, QSFP-40G-SR-BD transceiver can provide two different wavelengths on each fiber transmit 40Gbps data over the traditional 10G MMF cabling.

In the QSFP-40G-SR-BD transceiver, there are four 10Gbps signal channels which are converted to two bidirectional channels of 20Gbps signals. Each 20Gbps signals are transmitted over two different wavelengths (usually 850nm and 900nm). As shown in the following:

qsfp 40g sr bd using duplex LC MMF

Figure2: QSFP-40G-SR-BD using duplex LC MMF

Advantages of SFP-40G-SR-BD 40G Transceiver

  • Easier for upgrading to 40G -With QSFP-40G-SR-BD transceiver, it is easier to rescue existing 10G fiber infrastructure for higher speed 40G cable connections. And you don’t need to upgrade cabling or rewire your data center for larger capacity anymore.
  • Cost-saving – If you set up the 40G data center fabric by a traditional way, you may need much more fibers. Take the 40GBASE-SR4 transceiver as an example, it requires eight fibers for 40G Ethernet. While QSFP-40G-SR-BD transceiver just requires two fibers but can meet the 40GBASE-SR4 performance criteria. So with a QSFP-40G-SR-BD transceiver, there is no need for you to add more fibers.
  • Time saving – As what has been mentioned above, 10G Ethernet is too slow to meet the demand for great performance in the network. With QSFP-40G-SR-BD 40G transceiver, you can get 40G Ethernet, which is faster than before. That is to say, you can save more time to get what you need in the network.


QSFP-40G-SR-BD 40G Transceiver is an ideal and feasible option for 10G Ethernet to 40G Ethernet migration. By using the QSFP-40G-SR-BD 40G transceiver, it is unnecessary to update the fiber infrastructure with high-cost money and long time. FS provides various 40G QSFP BiDi transceivers with cheap price and reliable quality. If you have any needs, welcome to visit FS.COM.

Related Article: 40GE Data Center Cabling Options – Transceivers & Direct Attach Cables

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How Much Do You Know About PoE Powered Switch?

PoE (Power over Ethernet) technology allows network cable to provide both data and power for the PoE-enabled device. It can provide higher power and reduce a lot of power cables during network. And it has changed the current situation of the wireless network. Well, the PoE powered switch plays a crucial role in the PoE technology. So this article will give a clear explanation to PoE powered switch.

What Is PoE Powered Switch?

PoE powered switch is a fiber switch with PoE passthrough which has multiple Ethernet ports to connect network segments. It not only transmits network data but also supplies power via a length of Ethernet network cable, like Cat5 or Cat6. There are two standards for PoE powered ethernet switch. One is 802.3af which provides 15.4 watts of power. The other is 802.3at which provides 25.5 watts. What’s more, most PoE switches offered in the market can provide the speed of 10/100/1000Mbps. And the types of hubs can be classified into 8/12/24/48 port PoE network switch, or unmanaged and managed PoE network switch. Among the various port designs, the 24 port PoE switch is considered as a decent option for both business and home network.

managed 24 port PoE switch

Figure1: managed 24 port PoE switch

Why Use PoE Powered Switch?

PoE powered switch brings many advantages to an installation, so it has become an optimized choice for users. The following are some main advantages of PoE network switch:

  • Flexibility

The PoE network switch is powered through existing PoE network infrastructure and eliminates the demand for additional electrical wiring. Therefore, you can deploy it without an external power adapter. This gives you the flexibility to install the switch exactly wherever you need it.

  • Reliability

Since PoE power comes from a central source and separates from the data signal rather than a collection of distributed wall adapters. There is no interference of the PoE power transmission and data can be backed up by an uninterruptible power supply.

  • Safety

PoE network switch is intelligent and designed to protect network equipment from overload, underpowering, or incorrect installation. It also allows administrators visibility and control.

  • Cost-efficient

With PoE network switch, there is no need for users to purchase and deploy additional electrical wires and outlets. So it make significant savings on installation and maintenance costs.

What Is PoE Powered Switch Used for?

PoE network switch has many network applications. There are three key types of PoE networking architectures:

  • IP Cameras

PoE is now ubiquitous on networked surveillance cameras. It allows each camera to be controlled remotely from any point in the IP camera systems. Besides, it also enables fast deployment and easy repositioning.

  • VoIP Phones

VoIP phone is the most common and original PoE application with a single connection to a wall socket. It can be remotely powered down just like with the older analog systems. With PoE powered ethernet switch, only data network cable is required. PoE network switch has facilitated business communication and reduced deployment costs of VoIP.

  • Wireless Access Points (WAP)

The wireless network is greatly enhanced by the usage of PoE. Data network can be transmitted by running Cat5e or Cat6 network cable from the WAP to the nearest power. And power can be also provided over the same cable. In addition, Wifi, Bluetooth APs, and RFID readers are commonly PoE-compatible. So, these devices allow remote location away from AC outlets, and relocation following site surveys.

PoE powered switch solution

Figure2: PoE powered switch solution


PoE powered switch works as the heart of a PoE network. It saves both time and money for network deployment and maintenance. FS is a good place to go for the reliable and cheap PoE network switch. If you have any needs, welcome to visit FS.COM.

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Single Mode Fiber Comparison: G.652 vs G.655

Single mode fiber is designed as a carrier for the transmission of a single mode of light to propagate at a time. Its specifications are divided into two categories, One is the ITU-T G.65x series, and the other is IEC 60793-2-50 (published as BS EN 60793-2-50). Rather than referring to both ITU-T and IEC terminologies, we’ ll only focus on the simpler ITU-T G.65x in this article. There are 6 different single mode fiber types defined by the ITU-T: G.652, G.653, G.654, G.655, G.656, and G.657, among which G.652 and G.655 are two options commonly used. So what’ s the difference between G.652 and G.655?

Single mode fiber

What is G.652 Single Mode Fiber?

G.652 single mode fiber, also known as standard single fiber, is the most commonly deployed single mode fiber. It has G.652A, B, C and D four variants. The G.652.A and G.652.B are designed to have a zero-dispersion wavelength near 1310 nm, therefore they are optimized for operation in the 1310nm band. However, they are not suitable for applications in Wavelength Division Multiplexing (WDM) due to water peak. The more advanced variants G.652.C and G.652.D fibers are optimized with a reduced water peak for spectrum operation, which allows them to be utilized in the wavelength region between 1310 nm and 1550 nm to support Coarse Wavelength Division Multiplexed (CWDM) transmission.

What is G.655 Single Mode Fiber?

G.655 single mode fiber is also called non zero dispersion-shifted fiber (NZDSF) , because the dispersion at the wavelength of 1550 nm is close to zero but not zero. It contains 655 A, B and C three variants. G.655 fiber optic cable has a small, controlled amount of chromatic dispersion in the C-band (1530-1560 nm), where amplifiers work best, and has a larger core area than G.652 fiber. Besides, there are two types of NZDSF: (-D)NZDSF and (+D)NZDSF. They have respectively a negative and positive slope versus wavelength. The positive dispersion of G.655 can suppress four-wave mixing and other nonlinear effects. Hence G.655 single mode fiber distance is long and transmission capacity is high, it is suitable for DWDM transmission.

Difference between G.652 and G.655

G.652 vs G.655 Single Mode Fiber: What Is the Difference?

G.652 and G.655 differ in several specifications, for example, wavelength, dispersion, the parameter of attenuation and PMD, division and so on. Unlike G.652 which has a zero-dispersion wavelength at 1310 nm and reduced water peak to support CWDM, G.655 fiber is a non-zero dispersion-shifted fiber with the characteristics of elimination of FWM and low dispersion value,  applied to DWDM. When it comes to the fiber optic cable price, G.652 is lower than G.655. Besides, there are other detailed differences between G.652 and G.655 in the following table.

Single Mode Fiber Difference


This article gave an explanation of two categories of single mode fiber types and made a comparison between G.652 and G.655. If you need the transmission with not very high rate and long distance, G.652. D is recommended. If you need the DWDM system required much higher capacity and long distance, G655 can be the best choice regardless of much higher cost. For more detailed information about single mode fiber, you can contact fs.com.

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SFP-10G-SR vs X2-10G-SR: Which One to Choose?

The 10G transceiver is considered as the mainstream module in the market due to its mature technology and low price. There are various types of 10G transceiver modules like 10GBASE SR10GBASE LR, etc. SFP-10G-SR and X2-10G-SR are two very popular 10GBASE SR optical transceivers, which offer customers a wide variety of 10 Gigabit Ethernet connectivity options for data center, enterprise wiring closet, and service provider transport applications. Here, we will make a comparison between SFP-10G-SR and X2-10G-SR.

What is SFP-10G-SR?

SFP-10G-SR belongs to 10GBase SR SFP+ transceiver modules family. It has the industry’s smallest 10G form factor and the highest density of each chassis. As a hot-swappable module, it can be plugged into the Ethernet SFP+ port on a Cisco switch without the need to power down the host network system. Besides, it provides 10GBase SR throughput up to 300m over laser-optimized OM3 multi-mode fiber (MMF). This module has LC duplex connector operating over 850nm for short reach. In addition, minimum cabling distance for SR modules is 2m, according to the IEEE 802.3ae.


What is X2-10G-SR?

The X2-10G-SR is a highly integrated 10GBase SR module for high-speed 10Gbit/s data transmission applications. It is a hot-pluggable 70-pin connector with XAUI electrical interface. X2-10G-SR is Designed for 300m transmission distance over multi-mode fiber with a vertical cavity surface emitting laser(VCSEL). It has SC duplex connector operating over 850nm for short reach. The operating case temperature standard is from 0℃ to 70℃. What’s more, X2-10G-SR is compatible with X2 MSA Rev.2.0b and SFF-8724 Digital optical monitoring.


SFP-10G-SR vs X2-10G-SR

SFP-10G-SR and X2-10G-SR have many similarities, for instance, they support 10 Gigabit Ethernet, provide a link length of up to 300m on multi-mode fiber, deliver serialized data at a line rate of 10.3125 Gbit/s, have the same receiver sensitivity and TX power and so on. However, these two transciver modules still differ in some aspects.


Obviously, X2-10G-SR is paired with SC duplex connector interface with MMF while SFP-10G-SR has LC duplex connector with MMF. So it is a very important distinction for you to consider choosing the right transceiver modules. If you want to buy a 10G transceiver module with LC connector, SFP-10G-SR might be an ideal choice.


Although different vendors may make the different price of SFP-10G-SR and X2-10GB-SR transceivers. In general, the SFP-10G-SR price is lower than the X2-10GB-SR.


Both SFP-10G-SR and X2-10GB-SR are intended for 10 Gigabit Ethernet deployments in diverse networking environments. But the former can also be applied in 10GBASE-EW at 9.95Gbps, 1000 Base-LX Ethernet, 8x FC at 8.5Gbps, 4x FC at 4.25Gpbs, 2x FC at 2.125Gpbs and other optical links.

Module Type

SFP-10G-SR is with SFP+ transceiver package and are used in SFP compatible slots. While X2-10GB-SR is with X2 package and used in X2 compatible slots.


After the comparison of SFP-10G-SR vs X2-10GB-SR, we can see that each one has its own set of advantages and disadvantages. In fact, it totally depends on your actual needs. As a reliable and qualified fiber optics supplier, FS is your ideal choice for compatible transceivers. Kindly contact fs.com for more details if you are interested.

Related Article: A Comprehensively Understanding of Cisco 10G SFP+

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Understanding Ports on CWDM MUX/DEMUX

WDM (Wavelength Division Multiplexing) is a commonly used technology in optical communications. CWDM and DWDM MUX/DEMUX are two important components in WDM systems, which are often deployed to join multiple wavelengths onto a single fiber. There are some ports on CWDM and DWDM MUX/DEMUX like channel port, line port, monitor port, etc. This article will focus on discussing the functions of ports on CWDM MUX/DEMUX.

CWDM MUX ports


CWDM MUX/DEMUX (Coarse Wavelength Division Multiplexer/Demultiplexer) is a flexible, low-cost solution that enables the expansion of existing fiber capacity. CWDM multiplexer is for combining signals together, while demultiplexer is for splitting signals apart. The wavelengths used in CWDM implementations are defined by the ITU-T G.694.2, listing 18 wavelengths from 1270nm to 1610nm with a channel spacing of 20 nm. CWDM Multiplexer/Demultiplexer is designed to support a broad range of architectures, ranging from scalable point-to-point links to two fiber-protected rings.

Common Ports on CWDM MUX/DEMUX

For CWDM MUX/DEMUX, channel port and line port are the most common and necessary ports for normal operation of the CWDM Multiplexer/Demultiplexer.

Channel Port

A CWDM MUX/DEMUX usually has several channel ports on different wavelengths. Each channel port works for a specific wavelength. It  uses 18 wavelengths ranging from 1270nm to 1610nm with a channel space of 20nm. The number of channel ports on CWDM Multiplexer/Demultiplexer is usually ranging from 2 to 18.

Line Port

Line port of CWDM MUX/DEMUX can be divided into dual-fiber and single-fiber types. The wavelengths’ order and the applications of them are totally different. Dual-fiber line port is used for bidirectional transmission, which means the TX port and RX port of every duplex channel port supporting the same wavelength. The CWDM MUX/DEMUX with dual fiber line ports installed on the two ends of the network could be the same. However, single-fiber line port only supports one direction data flow, thus the transmit and receive port of the duplex channel will support different wavelengths. The wavelengths’ order of single-fiber CWDM Multiplexer/Demultiplexer should be reversed at both sides of the network.

Ports on CWDM MUX

Special Ports on CWDM MUX/DEMUX

Except for the common ports, some special ports can also be found on CWDM MUX/DEMUX for particular needs.

1310nm Port and 1550nm Port

1310nm and 1550nm ports are certain wavelength ports. The port can be used to combine an existing legacy 1310nm or 1550 nm network with CWDM channels, allowing the CWDM channels to be overlaid on the same fiber pair as the existing 1310nm or 1550 nm network. Besides, the wavelengths which are 0 to 40 nm higher or lower than 1310 nm or 1550 nm cannot be added to the device. Many optical transceivers, especially the CWDM SFP/SFP+ transceiver, use these two wavelengths for a long-haul network.

Expansion Port

Expansion port is used to add or expand more wavelengths or CWDM channels to the network.  It means that when a CWDM MUX/DEMUX cannot meet all the wavelength needs, it is convenient to use the expansion port to add different wavelengths by connecting to another CWDM Multiplexer/Demultiplexer line port. However, not every CWDM MUX/DEMUX has an expansion port.

Monitor Port

Monitor port is used for signal monitoring or testing. If you choose a single-fiber CWDM MUX/DEMUX, the monitor port should be a simplex fiber optic port. For a dual-fiber MUX/DEMUX, you can add a duplex or a simplex monitor port for the whole network monitoring.


The common ports and the special ports on CWDM MUX/DEMUX all have their own features and application. Certainly, CWDM Multiplexer/Demultiplexer is a popular technology which can provide cost-effective solutions for users to upgrade their network. FS.COM supplies various types of CWDM MUX/DEMUX, for instance, dual fiber, single fiber, and 4/8/9/18channels. All the above-mentioned ports especially the special ports can be customized for your preference. If you have any needs, welcome to visit FS.COM.

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How to Identify the Fiber Patch Cord Color Code?

Fiber patch cord, often called fiber patch cable or fiber jumper, is a fiber optic cable terminated with fiber optic connectors (LC, SC, MTRJ, ST etc.) at each end. Fiber patch cord can be classified into various types based on different standards, such as fiber cable mode, transmission mode, jacket type, connector type and polishing type. And fiber patch cord plays an important role in server rooms and data centers. Well, it is not unusual for us to mix up so many types of fiber patch cables. Fortunately, fiber patch cord color code could help us identify a fiber patch cable from its jacket, buffer, tube, connector, etc.

Fiber Patch Cord Color Code for Outer Jacket

Colored outer jackets or print might be used on premises fiber cables like fiber patch cord. And there is a color code standard: EIA/TIA-598, which defines the jacket color codes for different fiber types. The colors don’t only apply for the application though, they also are meant to be of use in determining a cables properties. The differences in colors are based on different levels of OM and OS fiber (Optical Multimode & Optical Singlemode). In addition, for optical fiber cable that contains only one type of fiber we can easily identify it by its jacket color. Unless otherwise specified, the outer jacket of premises cable containing more than one fiber type shall use a printed legend to identify the quantities and types of fibers within the cable. For example, “12 Fiber 8 x 50/125, 4 x 62.5/125.” Here are the jacket color codes for different fiber types:

Fiber Patch Cord Color Code for Outer Jacket

Fiber Patch Cord Color Code for Inner Cable Organization

Fiber patch cord is separated into strands, which are the individual fibers within the out jacket. According to EIA/TIA-598, inner fibers are color coded in a group of 12 fibers and they are counted in a clockwise direction. Up to 24 individual strands can be manufactured loosely, and after that point, they are usually sectioned into tubes containing 12 each. So there are two situations for multi-fiber patch cords:

  • For cables that consist of multiple buffer tubes each with 12 or fewer strands. Each tube will be numbered or colored following the same fiber color code.
  • For cables that have over 12 strands, the color code repeats itself. Each 12-strand group is identified in some other unique way such as adding a stripe or some other specific marks to the new group.
Fiber Patch Cord Color Code for Inner Cable Organization

Fiber Patch Cord Color Code for Connector

Connector color code is also a part of the fiber patch cord color code. Because there are different polish styles of fiber end-face, the connectors of the fiber patch cord are color coded for identification. LC fiber is one of the most commonly used fiber optic patch cords and the LC fiber connector is not hard to be color coded luckily. However, with the advent of metallic connectors like the FC and ST, connector color coding becomes difficult. Therefore, colored strain relief boots or shells are also used. The boot color may vary among manufacturers.

Fiber Patch Cord Color Code for Connector


Fiber patch cord color code assists us in distinguishing fiber patch cable types visibly from the colored fiber jacket, fiber connector, fiber boot, etc. What’s more, fiber color coding can be widely applied in identifying optical fiber types and is also practical for fiber optic engineering. FS.COM offers a broad range of standard fiber patch cord types. If you want to know more about fiber patch cord, kindly contact sales@fs.com for more details.

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Copper SFP vs Fiber SFP: Which One is Better?

The battle between copper and fiber has raged for many years. Copper has been used for a long time while fiber has already established a niche in the industry. Someone even held that fiber might replace copper. This competition of copper and fiber also exists in the field of transceiver module. Actually, there is a measurable distinction of copper SFP vs fiber SFP. This article will make a comparison of their strength and weaknesses.

What Is Fiber SFP?

Fiber SFP is a type of compact, hot-pluggable optical transceiver module, which is widely used for both telecommunication and data communications applications. Fiber SFP modules are commonly available in several different categories:

  • The 1000BASE-SX SFP, operates on legacy 50 μm multimode fiber links up to 550 m and on 62.5 μm multimode fibers up to 220 m. It can support up to 1km over laser-optimized 50 μm multimode fiber cable.
  • The 1000BASE-LX/LH SFP, operates on standard single-mode fiber-optic link spans of up to 10 km and up to 550 m on any multimode fibers.
  • The 1000BASE-EX SFP operates on standard single-mode fiber-optic link spans of up to 40 km in length.
  • The 1000BASE-ZX SFP operates on standard single-mode fiber-optic link spans of up to approximately 70 km in length.

Fiber SFP with LC or SC optical connectors is used in Fast Ethernet and Gigabit Ethernet. Fiber SFP can offer different wavelengths and optical power budgets to allow transmission distances from 550m to 120km. Besides, there are other SFP types like CWDM SFP and DWDM SFP, which are used to increase the bandwidth of the fiber network. CWDM SFP modules come in 8 wavelengths covering from 1470 nm to 1610 nm, while DWDM SFP is designed for a longer transmission distance, whose maximum wavelength is 1620 nm and the maximum transmission distance is 200 km.

fiber SFP of copper SFP vs fiber SFP

What Is Copper SFP?

Copper SFP is also a kind of SFP (small form-factor pluggable) or mini GBIC (gigabit interface converter) transceiver module. Copper SFP supports 1000Mbps over Cat5 cables with RJ45 connector interface, which allows communications over the Cat5 unshielded twisted-pair copper cable of link lengths up to 100 m. It supports the standard of 10/100BASE-T, 1000BASE-T, 10/100/1000BASE-T transceivers. Among them, 1000BASE-T is the most commonly used which allows a segment with a maximum length of 100 m and allows auto-negotiation between 100Mbps and 1000Mbps. It can be used in data centers for server switching, LANs, for uplinks or directly to the desktop for broadband application.

copper SFP

Copper SFP vs Fiber SFP

The difference between copper SFP vs fiber SFP will be described in the next part from the aspects of distance, operating temperature, security, interface, and cost.


Copper SFP supports the max cable distance of 100m, while the fiber SFP allows the transmission distance up to 120km, which demonstrates the high performance over longer distances. Generally, when the transmission distance is over 328 ft/100 m, fiber SFP must be considered instead of copper SFP, since 1000Mbps could only go as far as 100m over copper cabling.

Operating Temperature

Both copper SFP and fiber SFP support 0 to 70°C (32 to 158°F) case temperature as default. However, the power consumption and case surface will affect the temperature when copper SFP and fiber SFP operate in the specific applications. The typical power consumption of fiber SFP is 0.8W, the copper SFP is 1.05w. So copper SFP usually runs much hotter than the fiber SFP. Generally, the fiber SFP runs at 40°C (104°F) while the copper SFP should run around 52°C (126°F) in the same environment.


When it comes to the security in the connection between copper SFP vs fiber SFP, fiber SFP is worthier of being recommended than copper SFP. The reason is that fiber doesn’t conduct electricity, which makes it resistant to lightning strikes.


The SFP devices allow the switch to connect to cables of different types. Copper SFP connects an Ethernet copper cable with the RJ45 connector interface. While fiber SFP commonly connects a fiber optic cable with LC connector. In addition, for short-distance links on a Gigabit switch, it makes no difference if you use SFP ports or RJ45 ports to interconnect switches. The SFP port is mainly used to allow longer distance fiber connections. The enterprise-class switches usually include two or more SFP ports. However, in some case, the switch on one side does not have standard Ethernet ports but only with SFP slots, and the switch on the other side only has RJ45 ports which can’t be fitted with fiber ports. Under this condition, you have to insert a copper SFP module into the SFP slot on the switch, then use a Cat5 Ethernet cable to connect the copper SFP and the RJ45 gigabit port on the other switch.


In fact, copper SFP may be more expensive than fiber SFP transceiver within the same short distance. Copper SFP is popular for short-range backbone applications, as it’s easier and cheaper to use 1G copper SFPs and patch cables. However, with the boom of third-party vendors, fully compatible and trustworthy fiber SFP transceivers have been developed to support lower cost fiber runs. The price gap between 100m copper SFP and 40km 1000BASE-EX SFP fiber SFP is reduced. Thus, added choices are offered for customers to meet their specific demands.


Through copper SFP vs fiber SFP comparison, we can see that each one has its own set of advantages and disadvantages. Nowadays, the solution of mixing copper and fiber is the best practice to ensure the manageable data center. With the developing and unpredictable technology, we’d better think about all aspects of the product to meet our demands.

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Fast Ethernet vs Gigabit Ethernet

Ethernet is a group of networking technologies, which is used to connect multiple systems to develop a Local Area Network (LAN). Many types of Ethernet are there for use, but Fast Ethernet and Gigabit Ethernet are two main types which are more frequently used currently. This article will make a comparison between Fast Ethernet vs Gigabit Ethernet in detail.

Fast Ethernet vs Gigabit Ethernet

What Is Fast Ethernet?

Fast Ethernet (FE) is a term of Ethernet in computing networking, which stands for carrying on the traffic at the speed of 100 Mbps. It came into the market in 1995 with the IEEE 802.3u standard and the original version was at the rate of 10 Mbps. Fast Ethernet makes use of 100BASE-T, 10BASE-T, 100BASE-TX and so on. 100BASE-T is the most common Fast Ethernet, whose cable’s segment length is limited to 100m. 100BASE-TX is the predominant form of Fast Ethernet, and each network segment can have a maximum cabling distance of 100m. Besides, Fast Ethernet has different features such as several PHY layers, and both full duplex and half duplex modes are supported by it.

What Is Gigabit Ethernet?

Another type of Ethernet offers 1000Mbps in computing networking, therefore, got the name gigabit. Gigabit Ethernet (GE) was released only a few years after Fast Ethernet coming about, but was not widely used until the internet demands increased around 2010. It uses a frame format of 803.2 and also runs on half duplex and full duplex modes. The maximum length of this system can be up to 70km, therefore most universities and companies use it. GE has different versions such as 1, 10, 40 and 100 gigabits. There are several typical varieties of Gigabit Ethernet, for example, 1000BASE-CX is an initial standard for Gigabit Ethernet connections with maximum distances of 25m, 1000BASE-KX is part of the IEEE 802.3ap standard for Ethernet operation over Electrical Backplanes and its specified distance is 1m, 1000BASE-SX is an optical fiber Gigabit Ethernet standard for operation over multi-mode fiber using a 770 to 860 nanometer, near infrared (NIR) light wavelength.


Fast Ethernet vs Gigabit Ethernet: How They Differ From Each Other?

Both Fast Ethernet and Gigabit Ethernet are used for network connection. They can work with fiber switch, fiber optic cable, Ethernet cable and some similar devices. However, how they differ from each other? The following are some key differences between Fast Ethernet and Gigabit Ethernet.

  • The simplest difference between Fast Ethernet vs Gigabit Ethernet is their speed. Fast Ethernet runs at the maximum speed of 100 Mbps and Gigabit Ethernet offers up to 1 Gbps speed which is 10 times faster than Fast Ethernet.
  • Round-trip delay of Fast Ethernet is 100-500 bit times. As against, Gigabit Ethernet has the delay of 4000-bit times.
  • Configuration problems in Gigabit Ethernet are more complicated than Fast Ethernet. Sometimes Gigabit Ethernet needs high-compatibility fiber switch to work with, for instance, 10gbe switch.
  • The distance covered by Fast Ethernet is at most 10 km. However, the Gigabit Ethernet has the limit of 70 km.
  • Gigabit Ethernet is more expensive than Fast Ethernet. Upgrading of Fast Ethernet from Standard Ethernet is easy and cost-effective while upgrading of Gigabit Ethernet from Fast Ethernet is complex and expensive.
  •  Gigabit Ethernet requires specifically designed network devices that can support the standard 1000Mbps data rate like Gigabit Ethernet switch. Fast Ethernet requires no specific network devices.
Basis For Comparison
Fast Ethernet
Gigabit Ethernet
Offers 100 Mbps speed.
Provide 1 Gbps speed.
Generate more delay.
Less comparatively.
Complicated and create more errors.
Can cover distance up to 10 km.
Has the limit of 70 km.
Successor of 10-Base-T Ethernet.
A successor of fast Ethernet.
Round trip delay
100-500 bit times
4000 bit times


This article has looked upon and explained the two types of Ethernet: Fast Ethernet vs Gigabit Ethernet. Fast Ethernet is slower than Gigabit Ethernet, and provides maximum data speed up to 100 Mbps. And the latter has improved its speed at maximum to 1 Gbps by improving cabling technology, MAC layer, flow control protocols and quality of service.

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What Kind of RJ45 Patch Panel Should I choose?

RJ45 patch panels act as an important role in data centers, server rooms and other high-density cabling environments. In the market, varieties of RJ45 patch panels can be found today, for example, Cat5e patch panel, Cat6 patch panel, Cat6a patch panel, blank patch panel, etc. However, what kind of RJ45 patch panel should you choose? Here I’d like to give you some recommendations.

RJ45 patch panel

What Is RJ45 Patch Panel?

RJ45 patch panel, also called copper patch panel or Ethernet patch panel, is designed for both shielded and unshielded copper cables like Cat5e, Cat6, Cat6a and Cat7. This copper patch panel is commonly used in a local area network (LAN) as a mounted hardware assembly that consists of ports to connect and manage incoming and outgoing Ethernet cables. It is compliant with TIA/EIA 568 industry specifications and features both T-568A and T-568B wiring configurations. These patch panels can maximize the network performance and keep up with the growing changes in the network.

Why Choose RJ45 Patch Panel?

RJ45 patch panel offers people easy cable management, it has been acknowledged far and wide by more and more users. RJ45 patch panel is made from steel materials so that they can stand up even the most extreme conditions. And it contains user-friendly number coding and can be used with horizontal cable manager at the front or rear. Besides, RJ45 patch panel can also be your first choice in copper/Ethernet cabling system as it is cost-efficient and durable.

What Are RJ45 Patch Panel Types?

RJ45 patch panel can be categorized into the shielded or unshielded patch panel, flat or angled patch panel, etc. According to different connection cable types, some are recommended in the following part.

Cat5e Patch Panel

Cat5e patch panel is one of the RJ45 patch panel types, which is commonly used for high-speed LAN transmission. It meets the TIA/EIA 568 industry specifications and is available in 8, 12, 24, and 48-port versions. It’s convenient for identification with number labels. 12-port and 24-port are common patch panels, while high-density patch panels are available in flat and angled designs with 24 or 48 ports configurations. Compared to 48-port patch panel, the 24-port Cat5e patch panel is more popular in the market.

cat5e patch panel
Cat6 Patch Panel

Specially designed for Gigabit Ethernet applications, Cat6 Ethernet patch panel also meets and even exceeds TIA/EIA 568 industry specifications, and can match all kinds of Cat6 cables and accessories. In addition, Cat6 patch panel features high-density and offer the performance required for present and next generation data communications networks and applications. Cat6 patch panel is always designed with 12-port, 24-port, and 48-port configurations.

24-port cat6 patch panel
Cat6a Patch Panel

Cat6a patch panel supports all performance requirements of IEEE 802.3an (10GBase-T) and TIA Augmented Category 6 (Cat6) cabling specifications without requiring the use of individual jacks for the panel termination. This Ethernet patch panel can be utilized to future-proof your network connection for 10 Gigabit Ethernet. Moreover, it can be installed effortlessly in universal 19″ racks/cabinets, or 1U mount brackets.

cat6a patch panel


All in all, there are so many types of RJ45 patch panel in the market, and you can choose the appropriate one based on the function and performance you actually need. Of course, the reasonable price is also needed to be considered. Hope this article can help you make the right choice when you need to buy RJ45 patch panels.

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Overview of Commonly Used Multimode Fiber

In fiber optic cable market, the demand for single mode fiber and multimode fiber optic cable are increasing rapidly. Both of them are available for higher bandwidth and faster speed connections. Between them, multimode fiber is commonly used for shorter distance data transmission in LAN enterprise and data center applications. However, how much do you know about multimode fiber? Let’s have an overview of multimode fiber in this article.

What is Multimode Fiber

Multimode fiber (MMF) is a kind of optical fiber commonly used in communication for relatively short distances, for instance, inside buildings or corporate campuses. Multimode fiber optic cable has a larger core, typically 50 or 62.5 microns that enables multiple light rays or modes to be propagated simultaneously. However, the modes tend to disperse over longer lengths that the transmission distance of MMF is limited. The maximum transmission distance for MMF cable is around 550m at 10Git/s. Other typical transmission and distance limits are 2km at the speed of 100Mb/s and 1km at 100Mb/s.

Multimode Fiber

Multimode Fiber Types

Multimode fiber optic cables can be categorized into OM1, OM2, OM3, OM4 and OM5 fiber types by ISO 11801 standard. The next part will compare these fibers from the side of core size, bandwidth, data rate, distance, color and optical source in details.

Multimode Fiber Types
OM1 Fiber

Initially OM1 fiber typically comes with an orange jacket and has a core size of 62.5 micrometers (µm). It can support 10 Gigabit Ethernet at lengths of up to 33 meters. It is most commonly used for 100 Megabit Ethernet applications. This type is suited for using a LED light source.

OM2 Fiber

Conventional OM2 has a suggested jacket color of orange and works with LED based equipment as well as OM1. While it has a smaller core size of 50µm instead of 62.5µm. It supports up to 10 Gigabit Ethernet at lengths up to 82 meters, but is more commonly used for 1 Gigabit Ethernet applications.

OM3 Fiber

OM3 comes with an aqua color jacket. Like the OM2, its core size is 50µm, but the cable is optimized for laser based equipment. OM3 provides 10 Gigabit Ethernet at lengths up to 300 meters, which is its most common use. Moreover, this type enable its use with 40 Gigabit and 100 Gigabit Ethernet up to 100 meters.

OM4 Fiber

OM4 is completely a further improvement to OM3. They share the same distinctive aqua jacket, same core size of 50µm and both of them are optimized for laser based equipment. But OM4 supports 10 Gig/s at lengths up to 550 meters and it supports 100 Gigabit Ethernet at lengths up to 150 meters.

OM5 Fiber

OM5 fiber, also known as WBMMF (wideband multimode fiber), is backwards compatible with OM4. It has the same core size as OM2, OM3, and OM4. The official color of OM5 fiber jacket is lime green. It is designed and specified to carry at least four WDM channels at a minimum speed of 28Gbps per channel through the 850-953 nm window.

OM1 VS OM2 VS OM3 VS OM4 VS OM5:What’s the Difference

The primary difference between these types of multimode fibers depends on physical difference. Correspondingly, physical difference results in various transmission data rate and distance. The following part are their essential distinctions from physical and practical aspect.

Physical Difference

Physical difference mainly lies in diameter, jacket color, optical source and bandwidth, which is exposed in the following figure.

MMF Cable Type
Jacket Color
Optical Source
Lime Green
Practical Difference

The chart below illustrates the maximum reach of Ethernet variants over different types of multimode fiber.

MMF Category
Fast Ethernet

The Advantages of Multimode Fiber

Although multimode fiber has distance limits, it still has many significant advantages.

  • Multimode fiber can support multiple data transfer protocol, including Ethernet, Infiniband, and Internet protocols.
  • Multimode fiber carries multiple signals concurrently in the same line. Besides, the total power inside the signals carries almost no loss. Therefore, multimode fiber generally is utilized for backbone applications in buildings.
  • Last but not the least, MMF and components are cost effective and are easier to work with other optical components like fiber adapter and various fiber connectors, and multimode patch cords are less expensive to operate, install and maintain.


In general, multimode fiber cable continues to be the most cost-effective choice for enterprise and data center applications with 500-600 meter range. As for whether to choose a single mode fiber or multimode fiber, the applications that you need, transmission distance to be covered as well as the overall budget should be taken into consideration.

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