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SFP Tranceivers Functional Specifications

GBIC is an interface device that converts gigabit signals into optical signals.The GBIC design can be used for hot-plugging.GBIC is an interchangeable product that meets international standards.Gigabit switches, designed with GBIC interface, have a large market share in the market due to their flexibility.SFP can be simply understood as an updated version of the GBIC.

The GBIC module is divided into two categories: one is the GBIC module used by the common level federation, and the common connection with other switches is realized.The second is the stackable GBIC module to realize redundant connections with other switches.

GBIC is basically replaced by SFP for the following reasons:

SFP can be simply understood as an updated version of the GBIC.

SFP module (less than half the volume of the GBIC module), can be configured on the same panel more than twice the number of ports.

Since the SFP module is functionally consistent with GBIC, it is also known as a miniaturized GBIC.

The SFP module, by placing the CDR and the electro-dispersion compensation outside the module, compresses the size and power consumption.Application of optical communication in telecommunication and data communication.The SFP joins network equipment such as switch, router and other equipment main board and fiber or UTP cable.SFP is the industry specification supported by some fiber optic device providers.

SFP supports SONET, Gigabit Ethernet, Fiber Channel, and some other communication standards.This standard extends to SFP +, which can support 10.0 Gbit/s transmission rate, including 8 gigabit fiber channel and 10GbE.The SFP + module version of the optical fiber and copper core version is introduced, and compared with the module's Xenpak, X2 or XFP version, the SFP + module will leave some circuits in the motherboard implementation rather than in the module

SFP transceivers have many different kinds of sending and receiving, users can choose appropriate transceivers for each link, to provide based on the available optical fiber type (such as multimode fiber or single-mode fiber) can achieve "optical performance".Available optical SFP modules in general can be divided into the following categories: 850 nm wavelength / 550 m distance of MMF (SX), 1310 nm wavelength / 10 km distance SMF (LX), 1550 nm wavelength XD / 40 km distance 80 km, 80 km from ZX, distance of the EX or EZX, and DWDM.The SFP transceiver also provides the copper cable interface, so that the host equipment that is mainly designed for optical fiber communication can also communicate through UTP network cable.There is also the SFP of wavelength division multiplexing (CWDM) and single-fiber "bidirectional" (1310/1490 nm).

The commercial SFP transceiver can provide a speed of 4.25 G BPS.The packages of 10 Gbps transceivers are XFP, and the new variant "SFP +" that is basically consistent with SFP packaging.

Function description, most of the optical SFP transceivers support SFF - 8472 (industrial standard multilateral agreements), according to SFF - 8472 agreement, must support Digital Diagnostic monitoring (DDM, Digital Diagnostic Monitor) function, this feature enables the end user to real-time detection of SFP parameters, such as the five monitoring: basic Temperature (Temperature), transceiver Power supply voltage (Vcc), laser Bias Current (Tx Bias Current), light output Power (Tx Power), the input Power (Rx Power)


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