Reference Manual

Speech and Data Services
The TRAU frames exchanged between RBS and RTC during an active
call can be of the following types:
•
Data
• Data, containing Idle Data
The arrival of data blocks from the air interface is supervised by the
RBS.
If no data block is received, it is replaced by an idle data block.
Half Rate Data is either terminated by the RF Channel Release
function, or the Mode Modify function when Speech or Signalling
services are requested.
18.4 Operational Conditions
18.4.1 Full Rate Speech
The round-trip delay for a full rate speech channel, introduced by the
BTS, is less than 68 ms.
The values are including additional delay due to the measuring method
as described in /GSM 11.20:7.2.6, table 7–2b/.
18.4.2 Full Rate Data
Transparent data services supported:
•
14.4 kbits/s
•
9.6 kbits/s
• 4.8 kbits/s
• 2.4 kbits/s
• 1.2 kbits/s
•
1200/75 bits/s
• 600 bits/s
Non-transparent data services supported:
• 14.4 kbits/s
• 9.6 kbits/s
The round-trip delay for a full rate data channel, introduced by the RBS
is:
• Less than 89 ms for TCH/F2.4 (this includes TCH/F1.2, TCH/
F1.2/75 and TCH/F0.6 as well)
• Less than 160 ms for TCH/F4.8, TCH/F9.6
• Less than 175 ms for TCH/F9.6NT
The values are including additional delay due to the measuring method
as described in /GSM 11.20:7.2.6, table 7–2b/.
184 (421)
EN/LZT 720 0008 R1A
2001-06-26
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