5 The RA1 Function

08.203GPPRate Adaptation on the Base Station System - Mobile Service Switching Centre (BSS-MSC) InterfaceTS

For connections where only one channel is allowed used on the radio interface, the specification in 3GPP TS 04.21 for adaptation of synchronous data rates up to and including 9,6 kbit/s to intermediate rates 8 or 16 kbit/s shall apply.

For connection where more than one channel are used on the radio interface, rate adaptation shall apply on the corresponding substreams as specified in 3GPP TS 04.21 for AIUR of 4,8 kbit/s or 9,6 kbit/s.