Category Archives: SFP Transceivers

Overview of 1000BASE-BX SFP Bidi Transceiver

In communication networks, many transmission lines need bidirectional transmission. This need leads to the development of Bidirectional (BiDi) transceivers, which can transmit and receive data to/from interconnected equipment through a single optical fiber. BiDi transceivers are fitted with wavelength division multiplexing (WDM) diplexers, which combine and separate data transmitted over a single fiber based on the wavelengths of the light. BiDi transceivers must be deployed in matched pairs, with their diplexers tuned to match the expected wavelength of the transmitter and receiver that they will be transmitting data from or to. In this post, a kind of BiDi transceiver, 1000BASE-BX SFP BiDi transceiver will be introduced.


1000BASE-BX is a part of the Gigabit Ethernet standard related to transmission over fiber optic cable. 1000BASE-BX SFP modules are compliant with SFP Multi-Source Agreement (MSA) specification and SFF-8472, and conform to the IEEE 802.3ah 1000BASE-BX10 standard. 1000BASE-BX SFP modules include 1000BASE-BX-U SFP module and 1000BASE-BX-D SFP module. These two SFP modules must be used in pairs to permit a bidirectional Gigabit Ethernet connection using a single strand of single mode fiber (SMF) cable. These transceivers transmit and receive signals on one fiber strand using two wavelengths in each direction. These hot pluggable optical transceivers consist of two sections: the transmitter section uses 1490nm DFB laser/1310nm Fabry-Perot laser, and the receiver section uses 1310nm/1490nm receiver accordingly. The 1000BASE-BX-D SFP operates at wavelengths of 1490nm TX/1310nm RX, and the 1000BASE-BX-U SFP operates at wavelengths of 1310nm TX/1490nm RX. These transceivers use standard simplex LC connectors for fiber cable connection and provide a long transmission distance of up to 10 km.

Key Features
  • Data rate up to 1.25 Gbps
  • Hot-pluggable SFP footprint
  • 1490 nm DFB Transmitter and 1310 nm PIN Receiver
  • 1310 nm FP Transmitter and 1490 nm PIN Receiver
  • Transmission distance up to 10 km
  • Simplex LC connector
  • Low power dissipation
  • Digital diagnostic monitor interface is compliant with SFF-8472
  • Compliant with SFP MSA Specification
  • Compliant with IEEE 802.3z Gigabit Standard
  • RoHS compliance

1000BASE-BX-D SFP supports link length of up to 10km point to point on single mode fiber (1490nm-TX/1310nm-RX wavelength) at 1Gbps bidirectional. This optic uses an LC connector. The picture below show a Cisco GLC-BX-D compatible 1000BASE-BX-D SFP 1490nm-TX/1310nm-RX transceiver. The GLC-BX-D is a small form factor pluggable module for Gigabit Ethernet 1000BASE-BX and Fiber Channel communications. The GLC-BX-D transceiver operates at 1490Tx/1310Rx wavelength. It is compatible with the IEEE 802.3ah 1000BASE-BX10-D standards. A 1000BASE-BX-D device is always connected to a 1000BASE-BX-U device with a single strand of standard SMF.

Cisco GLC-BX-D Compatible 1000BASE-BX-D SFP DOM Transceiver


1000BASE-BX-U SFP supports link length of up to 10km point to point on single mode fiber (1310nm-TX/1490nm-RX wavelength) at 1Gbps bidirectional. This optic uses an LC connector. The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices. 1000BASE-BX-D transmits a 1490nm channel and receives a 1310nm signal, whereas 1000BASE-BX-U transmits at a 1310nm wavelength and receives a 1490nm signal. A wavelength-division multiplexing (WDM) splitter integrated into the SFP to split the 1310nm and 1490nm light paths. The GLC-BX-D and GLC-BX-U SFPs also support digital optical monitoring (DOM) functions according to the industry-standard SFF-8472 multisource agreement (MSA). This feature gives the end user the ability to monitor real-time parameters of the SFP, such as optical output power, optical input power, temperature and transceiver supply voltage. The picture below show a Cisco GLC-BX-U compatible 1000BASE-BX-U SFP 1310nm-TX/1490nm-RX transceiver.

Cisco GLC-BX-U Compatible 1000BASE-BX-U SFP DOM Transceiver

  • Gigabit Ethernet
  • Fiber Channel Links
  • Switch to switch interface
  • Switched backplane applications
  • Pouter/Server Interface
  • Other optical transmission systems

New organizational applications, virtualization, and data center consolidation trends are pushing your server I/O requirements to meet higher needs than before. With new BiDi optical technology, SFP BiDi transceivers make it much easier for you to upgrade your networks.

DOM — A Fiber Tester Inside Your SFPs

When reading parameters of an SFP transceiver, you may see words like “DOM”. Do you know what’s the meaning of “DOM”? And why should an SFP transceiver be with DOM? In this post, some detailed information about DOM will be given.

What Is DOM?

DOM, short for digital optical monitoring, is used to monitor some parameters of the transceiver in real-time, helping to identify the location of the fiber link failure, simplify maintenance, and improve system reliability. DOM allows you to monitor the TX (transmit) and RX (receive) power of the module, temperature, and transceiver supply voltage. You can configure your device to monitor optical transceivers in the system, either globally or by specified port. When this feature is enabled, the system monitors the temperature and signal power levels for the optical transceivers in the specified ports. Console messages and syslog messages are sent when optical operating conditions fall below or rise above the SFP manufacturer’s recommended thresholds. With DOM, network administrators can check and ensure that the module is functioning correctly in an easy and convenient way. This is why most of modern optical SFP transceivers support DOM functions. The following image shows a Brocade E1MG-SX-OM compatible 1000BASE-SX SFP DOM transceiver. With DOM function, it is able to assist network designers in detecting and digitizing parameter signals on circuit board inside the SFP module.

Brocade E1MG-SX-OM compatible 1000BASE-SX SFP DOM Transceiver

How to Use DOM?

To ensure the DOM capability function well, both the device and the platform must support the feature. When the transceiver module is DOM-enabled, a minimum software version may be required to support the feature in each platform. There are some restrictions of using DOM. Ensure that your optical transceiver supports DOM; specifies the time interval for monitoring optical transceivers; in case of combo ports with SFP and RJ45 provision, when SFP is inserted in slot or port and media type is not configured to SFP, DOM is functional only if global transceiver monitoring is enabled.

SFP Transceivers with DOM

With the popularity of DOM function, there are many SFP transceivers are with DOM, like 1000BASE-LX SFP DOM transceiver, 1000BASE-SX SFP DOM transceiver, 1000BASE-LX SFP DOM transceiver, 1000BASE-EX SFP DOM transceiver, and 1000BASE-ZX SFP DOM transceiver. And there are many third-party optical transceiver include the DOM functionality. What should be mentioned here is that although optical transceivers with DOM are much popular than those without DOM, some user still use the older optical transceivers in consideration of the upgrading costs.


SFP transceivers with DOM help to ensure that the business can be proactive in preventative maintenance of the network and ensure business continuity. And it would easy to explain why modern transceivers are with DOM. It is an irresistible development trend of industry and technology. Fiberstore is a professional optical transceiver manufacturer and supplier, which offers a with varity of compatible SFP transceivers with DOM functionality with a low cost. For example, Allied Telesis AT-SPSX compatible 1000BASE-SX SFP DOM transceiver costs only $6.00, and NETGEAR AGM732F compatible 1000BASE-LX SFP DOM transceiver costs only $7.00.

Introduction to 10/100/1000BASE-T SFP Module

The SFP transceiver modules are hot-pluggable I/O devices that plug into module sockets. The transceiver connects the electrical circuitry of the module with the optical or copper network. There are many choices of SFP modules. You may see an SFP module labeled as 10/100/1000BASE-T SFP. As we know, 1000BASE-T is a standard for Gigabit Ethernet over copper wiring. How about 10/100/1000BASE-T SFP module? What is a 10/100/1000BASE-T SFP module? In this post, a brief introduction about 10/100/1000BASE-T SFP module will be given.


The 10/100/1000BASE-T SFP small form-factor pluggable (SFP) transceiver is based on the SFP Multi Source Agreement (MSA). It is a copper SFP supporting 10/100/1000BASE-T copper Ethernet standards. It is compatible with the Gigabit Ethernet and 1000BASE-T standards as specified in IEEE 802.3z and 802.3ab. 10/100/1000BASE-T electrical SFP transceivers use an integrated RJ-45 connector with transformer and PHY IC. The link length is up to 100m over four pair Category 5 UTP cabling. With the hot pluggability, the module offers a flexible and easy way to be installed into SFP MSA compliant ports at any time without the interruption of the host equipments operating online. Besides, this 10/100/1000Mbps SFP transceiver operates at wide temperature ranges and provides high performance. It is ideal for full-duplex Gigabit Ethernet connectivity to high-end workstations and wiring closets utilizing existing copper network infrastructure. And it provides a convenient way to add a copper connection to an SFP type switch that would typically be used for fiber SFPs. Picture below shows a Juniper EX-SFP-1GE-T SFP copper transceiver. It is a 10/100/1000BASE-T copper SFP, which is compliant with the Gigabit Ethernet standard as specified in IEEE STD 802.3 and can fully satisfy the 10/100/1000BASE-T application.

Juniper EX-SFP-1GE-T Compatible 10.100.1000BASE-T SFP Copper RJ-45 100m Transceiver

Key Features
  • Compliant with SFP Multi-Source Agreements standards (MSA)
  • 10/100/1000 Mbps Auto-Negotiation
  • Up to 1.25Gbps bidirectional data links
  • Hot-pluggable SFP footprint
  • Fully metallic enclosure for low EMI
  • Low power dissipation
  • Compact RJ-45 connector assembly
  • Access to physical layer IC via 2-wire serial bus
  • 10/100/1000 BASE-T operation in host systems with SGMII interface
  • Link length up to 100m with four pair UTP cabling

10/100/1000BASE-T SFP modules are extremely versatile, working with many equipment that support the SFP type of interface: Ethernet switches, routers and any other networking equipment. They support 10/100/1000 Mbps data-rate in excess of 100 meters and are ideally suited for implementing small form-factor Network Interface Cards (NICs) and uplinks. As such, it is highly appropriate for use in such high-density applications as LAN 10/100/1000BASE-T Fiber Channel, Gigabit Ethernet LAN switch applications, Gigabit Ethernet media converters, switch-to-switch interfaces, switch to switch SerDes interface, switch to switch SGMII interface, switched backplanes, gaming devices, router/server interfaces and other optical transmission systems.


Fiberstore offers a wide variety of SFP modules (T, TX, SX, LX, ZX, CWDM, DWDM and BiDi) to meet your requirements, for example, Meraki MA-SFP-1GB-TX compatible 1000BASE-TX SFP copper transceiver, and HP JD089B compatible 1000BASE-T SFP copper transceiver. Our SFP modules have been tested and guaranteed 100% compatible with various Ethernet switches from major manufacturers like Cisco, HP, Nortel, Extreme, or Netgear. Fiberstore optics are thoroughly tested and are subject to an extensive qualification process before being considered certified to work in modules and switches.

SFP Transceivers for Gigabit Ethernet Applications

SFP, small form-factor pluggable, a hot-swappable input/output device plugs into a Gigabit Ethernet port or slot. It is a popular industry format jointly developed and supported by many network component vendors. SFP transceivers have a wide variety of transmitter and receiver types, which allows users to select the appropriate transceiver for their link needs. Several different categories of SFP modules will be introduced in this article.

1000BASE-SX SFP for Multimode Fibers

The 1000BASE-SX SFP, compatible with the IEEE 802.3z 1000BASE-SX standard and SFP Multi-Source Agreement (MSA) standards, is a cost effective transceiver module with a wavelength of 850nm which supports data rates of up to 1.25 Gbps. It operates on 50/125μm multimode fiber links up to 550m and on 62.5/125μm multimode fiber links up to 300m. It also can support up to 1km over laser-optimized 50μm multimode fiber cable. Its electrical interface is compliant with SFF-8431. And it supports Digital Diagnostic Monitoring (DDM). The following is a picture of TRENDnet TEG-MGBSX compatible 1000BASE-SX SFP transceiver.

TRENDnet TEG-MGBSX Compatible 1000BASE-SX Transceiver

1000BASE-LX/LH SFP for Both Multimode and Singlemode Fibers

The 1000BASE-LX/LH SFP, compatible with the IEEE 802.3z 1000BASE-LX standard, is similar with the other SFP transceivers in basic working principle and size. 1000BASE-LX/LH SFP can be used for both single-mode and multi-mode. It is single-mode by design, but when it gets together with its friend “mode conditioning patch cable”, it can also be used for multi-mode application. It operates on standard singlemode fiber optic link spans of up to 10km and up to 550m on multimode fibers. 1000BASE-LX/LH SFP transceiver is a high performance 1310nm transceiver for singlemode fibers. It supports dual data-rate of 1.25 Gbps/1.0625 Gbps. 1000BASE-LX/LH SFP transceiver is commonly applied for Gigabit Ethernet links, Fiber Channel Switch Infrastructure and other optical transmission systems. The following picture shows a Cisco SFP-GE-L compatible 1000BASE-LX/LH SFP transceiver module.

Cisco SFP-GE-L Compatible 1000BASE-LXLH SFP Transceiver

1000BASE-EX SFP for Long-Reach Singlemode Fibers

The 1000BASE-EX SFP operates on standard single-mode fiber-optic link spans of up to 40 km in length. An inline optical attenuator should be inserted between the fiber optic cable and the receiving port on the SFP at each end of the link for back-to-back connectivity.

1000BASE-ZX SFP for Long-Reach Single-Mode Fibers

1000BASE-ZX SFP supports link length of up to 80km on single mode fiber at 1Gbps. The precise link span length depends on multiple factors such as fiber quality, number of splices, and connectors. This optic works at 1550nm wavelength and uses an LC connector.

1000BASE-T SFP for Copper Networks

1000Base-T is an extension of standard Ethernet technologies to gigabit-level network speeds. 1000BASE-T SFP operates on four pairs of the commonly installed category 5 unshielded twisted pair (UTP) cable or enhanced category 5 cabling version of UTP cabling of link lengths up to 100m. The following picture shows an HP JD089B compatible 1000BASE-T SFP transceiver.

HP JD089B Compatible 1000BASE-T SFP Copper RJ-45 100m Transceiver


SFP transceivers are designed to support SONET, gigabit Ethernet, Fibre Channel, and other communications standards. Each optical interface operates and is managed like a fixed port but gives the customer flexibility to hot-swap or interchange to different optical module types. There is a number of 1000 BASE SFP optics from Fiberstore that are available depending on the customer application and distance capability required. Each optical interface operates and is managed like a fixed port but gives the customer flexibility to hotswap or interchange to different optical module types. Fiberstore optics are thoroughly tested and are subject to an extensive qualification process.