Tag Archives: BiDi SFP

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.

BiDi Optical Transceiver Overview

Many modern optical transceivers utilize two fibers to transmit data between switches, firewalls, servers, routers, etc. One fiber is dedicated to receiving data from networking equipment, and the other is to transmit data to the networking equipment. Nowadays, a new optical transceiver technology is available which allows transceivers to both transmit and receive data to/from interconnected equipment through a single optical fiber. This technology now has led to the development of Bi-Directional transceivers, or BiDi transceivers for short.

What Is BiDi Optical Transceiver?

BiDi optical transceiver is a compact optical transceiver module used in optical communications for both telecommunication and data bidirectional communications applications. It interfaces a network device mother board, like a switch, router or similar device, to a fiber optic or unshielded twisted pair networking cable. It is a popular industry format supported by several fiber optic component vendors. In the industry there are several synonyms for Bidi optics, such as: Bi-directional optics, BX-D/BX-U, WDM and so on. Specifically, the SFP-1G-BX-D and SFP-1G-BX-U are for the 1G. BIDI 1G optics are a small form factor pluggable module for single mode Fast Ethernet, Gigabit, Fiber Channel, SDH/SONET applications. BiDi SFP can be produced either with SC or LC simplex port, that is used both transmission and receiving. The most typical wavelength combination is 1310/1490, 1310/1550, 1490/1550 and 1510/1570. For a link you need 2 different optics, one that sends 1310nm and receives 1490nm and the other side of the fiber, which has a Bidi optic which sends 1490nm and receives 1310nm. In most cases these wavelengths are mentioned as Tx (transmitting) and Rx (receiving) on the label of the optic.

How Do BiDi Transceivers Work?

The primary difference between BiDi transceivers and traditional two-fiber fiber optic transceivers is that BiDi transceivers are fitted with wavelength division multiplexing (WDM) couplers, also known as diplexers, which combine and separate data transmitted over a single fiber based on the wavelengths of the light. For this reason, BiDi transceivers are also referred to as WDM transceivers. To work effectively, 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.

For example: If paired BiDi transceivers, like GLC-BX-U and GLC-BX-D branded by Cisco, are being used to connect Device A (Upstream) and Device B (Downstream), as shown in the picture below, then:

BIDI transceiver working principle

  • Transceiver A’s diplexer must have a receiving wavelength of 1490nm and a transmit wavelength of 1310nm
  • Transceiver B’s diplexer must have a receiving wavelength of 1310nm and a transmit wavelength of 1490nm
Why Choose BiDi Transceivers?

The obvious advantage of choosing BiDi transceivers, such as SFP+ BiDi or SFP BiDi transceivers, is the reduction in fiber cabling infrastructure costs by reducing the number of fiber patch panel ports, reducing the amount of tray space dedicated to fiber management, and requiring less fiber cable. While BiDi transceivers, or WDM transceivers, cost more to initially purchase than traditional two-fiber transceivers, they utilize half the amount of fiber per unit of distance. For many networks, the cost savings of utilizing less fiber is enough to more than offset the higher purchase price of BiDi transceivers.

Fiberstore offers a large selection of BiDi transceivers branded by many famous companies, like Cisco, Juniper, and HP. BiDi SFP transceivers in Fiberstore can be produced either with SC or LC simplex port. And the typical wavelength combinations, such as 1310/1490, 1310/1550 and 1490/1550, are all available. For example, J9142B and J9143B branded by HP are paired BiDi SFP transceivers, using 1310nm/1490nm transmitter and 1490nm/1310nm receiver.