Reference Manual

Channel Distribution Function
RSL Radio Signalling Link. Layer 2
communication link for traffical services
on A-bis.
Terrestrial Channel Terrestrial channels are physical channels
for communication with, for example, the
BSC over the Transport Network. There
are different types of terrestrial channels,
dependent on their use:
– Terrestrial Signalling channels
– Terrestrial Traffic channels
Terrestrial signalling channels are used for
LAPD signalling only.
Unoccupied Terrestrial Channel
An unoccupied terrestrial channel is a
physical channel which can be used as,
but is currently not used as, a terrestrial
signalling channel or as a terrestrial traffic
channel.
56.3 Functions
The CDF (Channel Distribution Function) switches channels between
the entities connected to the switch. See figure below:
Channel distribution
Channel distribution
Transport network
interface
01_0297B
TRU
Signalling
(OML/RSL)
Air timeslot
resource (traffic)
CF
Figure 144 Channel distribution function (CDF)
All connections through the switch are configured by A-bis commands
as described within the context of Functionality Administration. The
configuration commands consist of a number of connections between
timeslots in the Transport network, the Concentrator and the TRXs.
438 (485)
EN/LZT 720 0008 P2A
2001-11-28
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