CPRI Cable Function and Details in Telecom

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a) What is CPRI cable?

b) Use of CPRI cable in telecom

c) Interconnection of CPRI cable in BBU and RRU

d) CPRI connector details or Fiber connector types

CPRI stands for Common Public Radio Interface.

CPRI is the world standard interface defined for Radio Equipment Controllers(REC). REC are basically Base Band Unit(BBU), Remote Radio Unit(RRU) in telecom industry. CPRI standard is followed by top leading telecom equipment manufacturer like Huawei,, Ericsson,Nokia,NEC,etc.

CPRI Functions :

CPRI is optical fiber that carry signals whether it is control or message. Control signals are the controlling signal that carry information of the status of the equipment installed in the BTS and other various traffic related control signals. Message signals is the information related to user communication. 

CPRI supports multi mode communication and doesn't support single mode communication. In optical fiber, single mode communication is that where single light is transmitted between two radio equipment for communication and data transfers whereas multi-mode supports more than one light to be transmitted through the same single optical fiber link at a time. Thus multi-mode is used for communication in very short distance whereas single mode is used for long distance communication because of low loss in single mode fiber.

Pic: SFP for Optical Fiber(CPRI) connection 

Below is the chart of the Optical fiber connector types: (source:Alibaba)

Among most of the connector types, LC-Duplex is very common in Telecom Industry for connecting BBU and RRU. 

LC-(Simplex and Duplex) is a push on,pull-off, multimode or singlemode fiber type of connector containing a standard RJ 45 telephone plug housing with a ceramic ferrule in a simplex or duplex plastic housing; SFF(Small Form Factor)and SFP(Small Form Pluggable) designs are suitable for high density interconnection and also useful for instrumentation and test equipment interconnections. It have insertion loss of  0.1 to 0.5 dB. 

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