Functions - Ericsson CME 20 R6.1 Reference Manual

Channel Distribution Function
RSL
Terrestrial Channel
Unoccupied Terrestrial Channel
35.3

Functions

The CDF (Channel Distribution Function) switches channels between
the entities connected to the switch. See figure below:
Transport network
interface
Figure 41
•
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.
218 (306)
Radio Signalling Link. Layer 2
communication link for traffic services on
A-bis.
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.
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.
Channel distribution
Channel distribution
Channel distribution function (CDF)
© Ericsson Radio Systems AB
— All Rights Reserved —
CF
TRX
Signalling
(OML/RSL)
Air timeslot
resource (traffic)
Concentrator
01_0297B
EN/LZT 123 2697 R5A
1998-08-13