Outline picture


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Related concepts

GBIC modules are divided into two categories: one is the GBIC module used in common cascade connection, which realizes the common connection with other switches; Redundant connection of the switch.

GBIC is basically replaced by SFP for the following reasons:

SFP (SmallForm-factor Plugables) can be simply understood as an upgraded version of GBIC.

SFP module (the volume is reduced by half compared to the GBIC module, and the number of ports can be more than doubled on the same panel.

Because the SFP module is basically the same as the GBIC in function, It is also called Mini-GBIC (Mini-GBIC) by some switch manufacturers.

The SFP module puts the CDR and electric dispersion compensation outside the module, which reduces the size and power consumption. Optical communication applications in telecommunications and data communications. SFP connects the motherboard and optical fiber or UTP cables of network equipment such as switches, routers and other equipment. SFP is an industrial specification supported by some optical fiber component providers.

SFP supports SONET , GigabitEthernet, Fiber Channel (FiberChannel) and some other communication standards. This standard is extended to SFP+, which can support 10.0Gbit/s transmission rate, including 8gigabit Fibre Channel and 10GbE. The SFP+ module version of optical fiber and copper core version is introduced, and the module Compared with the Xenpak, X2, or XFP version of the SFP+ module, the SFP+ module keeps some of the circuits on the motherboard instead of implementing it in the module. The SFP is designed according to the GBIC interface, allowing a greater port density (the number of transceivers per inch on the side of the motherboard) than GBIC, so SFP is also called "mini-GBIC". And The related small package transceiver (SFFtransceiver) is smaller in size than SFP, but SFF is soldered to the motherboard as a pin (asapinthrough-holedevice) instead of plugged into the side card slot. SFP main manufacturer

1, ATOPTechnology

2, HuaweiTechnology|Huawei Technology

3, CiscoSystems|Cisco System

4, Dongguan Yipu Optoelectronics Group

5, Xiamen Yagu Communication Technology Co., Ltd.

6, Shenzhen Yifeiyang Communication Technology Co., Ltd.

7, Shenzhen Guoyang Communication Co., Ltd.


9.CZT Wenzhou Yihua Connector Co., Ltd.


There are many different transmission and reception types of SFP transceivers. Users can select the appropriate transceiver for each link to provide the "optical performance" that can be achieved based on the available fiber types (such as multi-mode fiber or single-mode fiber). Available optical SFP modules are generally divided into the following categories: 850nm wavelength/550m distance MMF (SX), 1310nm wavelength/10km distance SMF (LX), 1 550nm wavelength/40km distance XD, 80km distance ZX, 120km distance EX or EZX, and DWDM. The SFP transceiver also provides a copper cable interface, so that host devices designed mainly for optical fiber communication can also communicate through UTP network cables. There are also wavelength division multiplexing (CWDM) and single-fiber "bidirectional" (1310/1490nm wavelength upstream/downstream) SFP.

Commercial SFP transceivers can provide speeds up to 4.25Gbps. Several packaging forms of 10Gbps transceivers are XFP, and a new variant "SFP+" which is basically the same as the SFP package.

Function description

Most optical SFP transceivers support SFF-8472 (industrial standard multilateral agreement). According to the SFF-8472 protocol, it must support digital diagnostic monitoring (DDM, DigitalDiagnosticMonitor) ) Function, this feature enables end users to detect SFP parameters in real time, such as the five basic monitoring variables: temperature (Temperature), transceiver supply voltage (Vcc), laser bias current (TxBiasCurrent), optical output power (TxPower), Input power (RxPower).

Information volume

SFPMSA defines a 256-byte memory map in EEPROM, standard interface, manufacturer and other information, which can be at the 8-bit address 10100000X( A0h)Visit

Advantages of upgrading

Many people don't know the difference between sfp and sfp+, so it sometimes brings unnecessary trouble. The 10G module has experienced the development from 300Pin, XENPAK, X2, XFP, and finally realized the transmission of 10G signals in the same size as SFP, which is SFP+. With its advantages of miniaturization and low cost, SFP has met the equipment's high-density requirements for optical modules. Since the implementation of the standard in 2002, it has replaced XFP and became the mainstream of the 10G market in 2010.

Advantages of SFP+ optical module:

1. SFP+ has a more compact form factor than X2 and XFP packages (the same size as SFP);

2. Directly connect with the same type of XFP, X2, XENPAK;

3, the cost is lower than XFP, X2, XENPAK products.

The difference between SFP+ and SFP:

1. The appearance and size of SFP and SFP+ are the same;

2, SFP protocol specification: IEEE802.3, SFF-8472;

The difference between SFP+ and XFP:

1, SFP+ and XFP are both 10G optical fiber modules, and can communicate with other types of 10G modules;

2 , SFP+ is smaller than XFP;

3, because of its smaller size, SFP+ combines signal modulation functions, serial/deserializer, MAC, clock and data recovery (CDR), and electronic dispersion compensation ( EDC) function moved from the module to the motherboard card;

4, XFP complies with the protocol: XFPMSA protocol;

5, SFP+ complies with the protocol: IEEE802.3ae, SFF-8431, SFF-8432;

6, SFP+ is a more mainstream design.

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