Speech And Data Services - Ericsson CME 20 R6.1 Reference Manual

37

Speech and Data Services

This chapter covers speech and data services, as well as the handling of
the link between the RBS and the RTC (Remote TransCoder) when
neither speech nor data is present.
37.1 References
/GSM:03.05/
/GSM:08.20/
/GSM:08.54/
/GSM:08.58/
/GSM:08.60/
/GSM:08.61/
/GSM:11.20/
Whenever a reference is made to a function described in another chapter,
please refer to the table of contents to find the appropriate chapter.
37.2 Concepts
Air Timeslot Resource
Terrestrial Traffic Channel
RTC
TRAU Frame
EN/LZT 123 2697 R5A
1998-08-13
GSM 03.05 Phase 2 Ver 4.0.0
GSM 08.20 Phase 2 Ver 4.1.0
GSM 08.54 Phase 2 Ver 4.0.0
GSM 08.58 Phase 2 Ver 4.2.0
GSM 08.60 Phase 2 Ver 4.1.0
GSM 08.61 Phase 2 Ver 4.1.0
GSM 11.20 Phase 1 Ver 3.11.0
The functional entity responsible for all
Air interface functions for one Air
timeslot. The Air timeslot resource can be
seen as 1/8 of a TRX.
Physical channel used for communication
with remote transcoder/rate adapter.
When the transcoders/rate adapters are
positioned remote from the RBS, they are
called RTCs. In this document, the RTC
is a part of BSC but is controlled by the
RBS.
To control the RTC from the RBS, control
information is added to the coded speech
information (or data information). This
results in a data block called a TRAU
(Transcoder Rate Adapter Unit) frame
which is transferred between the RBS and
RTC as described in /GSM:08.60/. The
size of the TRAU frame for full rate
speech/data/idle speech is 320 bits.
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