Detailed explanation and correlation about GSM LAPD-PCM30

[southeastkid]

Hi seniors,I am a newbie in cellular communication.I'm now studying independently (wthout any formal teacher) on GSM functional architecture.I want to ask about the correlation about 64Kbps used in GSM and LAPD protocol with BSC functionality and mapping on TRAU.An simple analogy and reccomended Ebook will be great
thanks before

 

[tpetar]

GSM Interfaces and Protocols
**broken link removed**

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http://en.wikipedia.org/wiki/Base_station_subsystem

 

[southeastkid]

GSM Interfaces and Protocols
**broken link removed**

- - - Updated - - -

https://en.wikipedia.org/wiki/Base_station_subsystem

Thanks
but,how is user data from BTS multiplexed to BSC according PCM30,I mean the proccess

 

[southeastkid]

help .......