SFP package - hot-swappable small package module, the current maximum rate can reach 10G, mostly using LC interface. SFP is SMALL FORM PLUGGABLE English abbreviation, can be simply understood as an upgraded version of GBIC. SFP volume is reduced by half compared to GBIC optical modules, SFP and more than double the number of ports can be configured on the same panel. Other features, SFP basic and GBIC consistent. So some switch manufacturers to SFP called miniaturized GBIC (ie MINI-GBIC)
SFP consists of:
Lasers: including transmitter TOSA and receiver ROSA
Circuit board IC,
External accessories are: shell, base, PCBA, pull ring, buckle, unlock pieces, rubber plug composition,
Also in order to identify the convenience, SFP generally to pull the ring color to identify the module's parameter type. For example: the black pull ring for the multi-mode, SFP the wavelength is 850nm; blue is the wavelength of 1310nm module; yellow is the wavelength of 1550nm module; purple is the wavelength of 1490nm module.
1, in accordance with the rate of 155M / 622M / 1.25G / 2.125G / 4.25G / 8G / 10G, 155M and 1.25G currently on the market with more, 10G technology is gradually mature, demand is rising attitude , SFP But also the future of the main optical module products. In the case of
2, according to the wavelength of 850nm / 1310nm / 1550nm / 1490nm / 1530nm / 1610nm, the wavelength of 850nm for the SFP multi-mode, transmission distance of 2KM or less, common like Cisco's GLC-SX-MM; wavelength of 1310 / 1550nm Single-mode, transmission distance of 2KM or more, relatively speaking, the price of these three wavelengths cheaper than the other three.
Bare module if there is no logo is easy to confuse, SFP the general manufacturers will distinguish the color of the ring, such as: black pull ring for the multi-mode, the wavelength is 850nm; blue is the wavelength of 1310nm module; yellow is the wavelength of 1550nm module ; SFP Purple is the wavelength of 1490nm modules.
1, SFP + has a more compact form factor (same size as SFP) than X2 and XFP packages;
2, and the same type of XFP, X2, XENPAK direct connection;
3, the cost is lower than XFP, X2, XENPAK products.