Cisco System, Inc. established in 1984, is an international reputable company providing internet solutions, equipment and software products, whose products are mainly used to connect a computer network system, Cisco routers, switches and other equipment carries 80% of global Internet communications, of the new economy in the Silicon Valley legend. Over the past 20 years, Cisco has almost become synonymous with the Internet, network applications, productivity, Cisco have become the market leader in every area of its entry. The company is also specialized in producing transceiver modules include a well advanced and useful type of transceiver namely mini GBIC or SFP module.
SFP is the abbreviation of Small Form Factor Pluggable referring to a compact small and hot-pluggable transceiver. Cisco SFP modules are designed to change the series electric signals to the serial optical signals for either telecommunication or data communication fields. The transceiver is usually working with a network device a switch or a router to connect to a copper networking cable or fiber optic. SFP is a recognized industry standard thus is supported by almost every leading vendors such as H3C, HP, Huawei. It is designed to support communication in standards such as Gigabit Ethernet, SONET, Fibre Channel and many others.
The Main Parameters of the SFP Module
Average transmit optical power (TxLOP: Optical Average Power) average transmit optical power refers to the signal logic 1 when the optical power and for 0:00 the arithmetic mean of the optical power. P0 + the P1 PAVG = 2 (dBm)
Consumers light ratio (ER: ExtinctiRatio) signal logic to 1, the optical power and is 0 when the light power size ratio. The calculation formula for: P1ER = 10log P0 (dB) ER extinction ratio, the unit is dB, P1 and P0 represents the logic 1 and 0 when the optical power.
The minimum average light reception sensitivity (Receiver Sensitivity) measure the receiving end of a certain bit error rate (1 × 10exp (-12)) To ensure the desired reception power, in units of dBm. BER is within a longer period of time, after received after the receiving side of the photoelectric conversion error output terminal of the number of symbols with the BER tester gives the ratio of the number of symbols.
Loss indicative signal (LOS Assert) restore instruction (LOS Dessert) receiver output an electric signal, and the signal is lost and the potential level of the adequacy reflects the intensity of the optical signal received by the receiver, to determine by comparing the potential of the preset potentiometer light whether the signal is lost. Potential has a certain effect hysteresis comparator to achieve, usually default electrical signal corresponding to the optical power as an indication, in dBm
Eye mask margin (EMM: Eye Mask Margin) eye opening, refers to the degree of “open” in the best sampling point eye amplitude distortion-free opening of the eye diagram should be 100 [%]. Eye diagram template tolerance eye mask expansion, until the eye diagram of the sampling points into the template of the biggest expansion of the expansion area percentage.
Cisco SFP is flexible in its extensive set of items including Cisco GLC-T, Cisco GLC-SX-MM, Cisco GLC-LH-SM, Cisco CWDM SFP, which can be used with the union of 1000BASE-T, 1000BASE-SX, 1000BASE- LX/LH, 1000BASE-EX, 1000BASE-ZX, or 1000BASE-BX10-D/U in a port-by-port basis.