Which unit is the BSC perform the LAPD signalling and Inband signalling(64kpbs).（）A、GSB、SRSC、TRHD、TRAU
Which unit is the BSC perform the LAPD signalling and Inband signalling(64kpbs).（）
- A、GS
- B、SRS
- C、TRH
- D、TRAU
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