What's the function of the Cisco module

What's the function of the Cisco light module ?

Cisco module classification and description:

1 Cisco 1 × 9 package optical modules: welding type module, general speed is less than1000m, using SC interface.

2 SFF package, Cisco optical module: welding small package module, general speed is less than 1000m, using LC interface.

3 GBIC package, Cisco optical module: hot pluggable Gigabit interface module, using SC interface.

4 SFP package, Cisco optical module: hot plug small package module, the highest rate of up to 4G, use the LC interface.

5 XENPAK package, Cisco optical module: applications in Gigabit Ethernet, using the SC interface.

The optical module is connected to the module of a photoelectric conversion effect, which transmit the electric signal into optical signal, the optical fiber transmission, the receiving end ofthe optical signals are converted into electric signals. The optoelectronic devices, circuits andoptical interface and other components, optoelectronic devices including the transmitting and receiving two parts.

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