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100BASE SFP Module

The 100BASE Small Form-Factor Pluggable (SFP) interface is a hot-swappable input/output device that connects a switch or router's Fast Ethernet, dual-rate Fast/Gigabit Ethernet, or Gigabit Ethernet ports to the fiber cabling network. Fast Ethernet (100BASE SFP), first implemented in 1995 as the IEEE 802.3u standard, was the fastest variant of Ethernet for three years before Gigabit Ethernet was introduced. Devices that support any of these existing requirements are often referred to as "GE/FE" in the industry. The main features of the 100BASE SFP module include:

  •   ● When deployed, we need not reboot the switch or router because it is hot-swappable.
  •   ● Supports the “pay-as-you-populate” corporate calculation
  •   ● Other 100BASE SFP modules on the same line card may get swapped out.
  •  ● Supports the rating ID option, which allows the switch or router to determine whether the SFP is qualified.
  •   ● On the same connection, optically interoperable with respective 100BASE Ethernet interfaces

Types of 100BASE SFP Modules

Your switches and routers are connected to the network using the industry-standard Small Form-Factor Pluggable Gigabit Interface Converter. Ethernet switches, routers, firewalls, and network interface cards are all equipped with SFP sockets.

It connects a network system motherboard to a fiber optic or copper networking cable (for a switch, firewall, media converter, or related device). Since SFP ports have mostly replaced older GBIC transceivers, they are often referred to as mini-Gigabit interface converter (GBIC) modules.


A lot of the Fast Ethernet standards developed for twisted pair cables, such as 100BASE-TX (100 Mbit/second over a 2-pair Cat5 or better cable), 100BASE-T4 (100 Mbit/second over 4-pair Cat3 or better cable, defunct), and 100BASE-T2 (100 Mbit/second over 2-pair Cat3 or better cable, also defunct), are specified as 100BASE-T. A 100BASE-T cable's section length is limited to 100 meters (328 feet) (the same limit as 10BASE-T and Gigabit Ethernet). Many of these are, or were, IEEE 802.3 standards (approved 1995). Almost all 100BASE-T installations use 100BASE-TX.

100BASE-FX SFP Transceiver Module

The most common form of Fast Ethernet is 100BASE-FX, which uses two wire pairs within a category-5 or higher cable setup. The maximum cable span for each network section is 100 meters (328 feet). For each direction, one pair is used, resulting in full-duplex processing with 100 Mbit/second throughput in each direction.

The active pairs in a regular connection are terminated on pins 1, 2, 3, and 6, much as in 10BASE-T. Since a standard category-5 cable has four pairs, it can accommodate two 100BASE-FX connections with the use of a wiring adaptor. Cabling is usually terminated according to the TIA/EIA-568-B standard, either T568A or T568B. The active pairs will be put on the orange and green pairs due to this (i.e., the canonical second and third pairs).

The 100BASE-TX networks are somewhat similar to the 10BASE-T networks in terms of configuration. When creating a local area network, the network's machines (such as computers and printers) are usually linked to a hub or switch, forming a star network. A crossover cable, on the other side, can be used to link two devices directly. Crossover cables are rarely necessary for today's equipment requirements since most equipment supports auto-negotiation as well as auto MDI-X to pick and set the match speed, duplex, and pairing.

The raw bits, presented in 4 bits wide at 25 MHz at the MII, go through the 4B5B binary encoding mechanism to produce a sequence of 0 and 1 symbols clocked at a 125 MHz symbol rate with 100BASE-TX hardware. The 4B5B encoding will provide DC equalization and spectrum shaping. The bits are then moved to the actual medium connection layer using NRZI encoding, much as in 100BASE-FX. 100BASE-TX, on the other hand, adds a medium-dependent sublayer that uses MLT-3 as the data stream's final encoding before transmission. The maximum fundamental frequency is 31.25 MHz as a result of this.