Ericsson RBS 2106 Reference Manual page 299

TCH/F2.4
TCH/F2.4
TCH/F2.4
TCH/F2.4
Any transition between the following half rate Channel Modes/
GSM:08.58:4.2/ is supported:
TCH/H
TCH/HS
TCH/H4.8
TCH/H4.8
TCH/H2.4
TCH/H2.4
TCH/H2.4
TCH/H2.4
Mode change between full rate channels, half rate channels and
multislot channels is not accepted.
Mode change between secondary channels are supported.
The Mode Modify message has one optional element:
"Encryption information".
RBS checks the availability of the requested resources and
acknowledges the MODE_MODIFY message by sending a
MODE_MODIFY_ACKNOWLEDGE message /GSM:08.58:8.4.10./ or
a MODE_MODIFY_NEGATIVE_ACKNOWLEDGE message /
GSM:08.58:8.4.11./ to the BSC.
The MODE_MODIFY_ACKNOWLEDGE message to BSC is not
related to the Air Interface. That is, the acknowledgement will be sent
before the actual transmission is started.
If the Mode Modify procedure fails after the
MODE_MODIFY_ACKNOWLEDGE message has been sent, a
CONNECTION_FAILURE_INDICATION /GSM:08.58:8.4.4/ message
is sent to BSC and the channel mode is changed to the mode requested
in the MODE_MODIFY message.
If the MODE_MODIFY_NEGATIVE_ACKNOWLEDGE message is
sent to the BSC, the channel mode is left unchanged (same as before
the MODE_MODIFY message was received).
After the positive acknowledgement of the MODE_MODIFY message,
the active service is deactivated and the requested service is activated.
EN/LZT 720 0008 P2A
2001-11-28
Full rate data 2.4 kbit/s transparent,
Uni-directional
Full rate data 1.2 kbit/s transparent,
Uni-directional
Full rate data 1200/75 bit/s transparent,
Uni-directional
Full rate data 600 bit/s transparent,
Uni-directional
Signalling
Half rate speech
Half rate data 4.8 kbit/s non-transparent
Half rate data 4.8 kbit/s transparent
Half rate data 2.4 kbit/s transparent
Half rate data 1.2 kbit/s transparent
Half rate data 1200/75 kbit/s transparent
Half rate data 600 bit/s transparent
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Mode Modify
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