2016年12月25日星期日

What Is XFP Transceiver?


XFP Transceivers, short for 10 Gigabit small form factor pluggable is a standard of transceivers for high-speed computer network and telecommunication links that use optical fiber. The XFP standard was defined by an industry group in 2002, along with its interface to other electrical components which is called XFI. The 10-Gigabit XFP transceiver module is a hot-swappable I/O device that plugs into 10-Gigabit ports. The XFP transceiver module connects the electrical circuitry of the system with the optical network.

The XFP packaging was smaller than the XENPAK form-factor and X2 which had been published earlier but are slightly larger than the original small form-factor pluggable transceiver (SFP). As the following picture shown, XFP Structure includes the basic six parts:

① Transmit optical bore
② Receive optical bore
③ Bail clasp
④ Dust plug
⑤ Transceiver socket connector

XFI Electrical Interface Specification
The XFI electrical interface specification was a 10 gigabit per second chip-to-chip electrical interface specification defined as part of the XFP multi-source agreement. It was also developed by the XFP MSA group. XFI provides a single lane running at 10.3125 Gbit/s when using a 64B/66B encoding scheme. A serializer/deserializer is often used to convert from a wider interface such as XAUI that has four lanes running at 3.125 Gbit/s using 8B/10B encoding. XFI is sometimes pronounced as "X" "F" "I" and other times as "ziffie".

Types of XFP Transceiver Modules
XFP are available with a variety of transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required optical reach over the available optical fiber type (e.g. multi-mode fiber or single-mode fiber). XFP modules are commonly available in several different categories:
1.SR - 850 nm, for a maximum of 300 m
2.LR - 1310 nm, for distances up to 10 km
3.ER - 1550 nm, for distances up to 40 km
4.ZR - 1550 nm, for distances up to 80 km

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