Digital Cellular Telecommunications System (Phase 2+); Rate Adaption on the Base Station System - Mobile-Services Switching Centre (BSC - MSC) Interface (GSM 08.20 Version 7.0.1 Release 1998)
The present document defines rate adaptation functions to be used in GSM PLMN Base Station Systems (BSS) transcoders and IWF for adapting radio interface data rates to the 64 kbit/s used at the A-interface in accordance with GSM03.10. The number of Base Station System - Mobile-services Switching Centre (BSS - MSC) traffic channels supporting data rate adaptation may be limited. In this case some channels may not support data rate adaptation. Those that do@ must conform to the present document. NOTE: The present document should be considered together with GSM 04.21 to give a complete description of PLMN rate adaptation.