Channel Distribution Function
35.3.6
Remote OMT Link
The function is initiated during restart of CMRU.
The RBS searches for Remote OMT link establishment on PCM A
timeslot 23 whenever this timeslot is not used for either:
•
traffic functions
•
subchannels with bitrate other than 64 kbit/s
When the remote OMT Link is established it uses a protocol based on
LAPD. SAPI values in the range 20–30 is used. If the RBS is
configured for multidrop it uses the CF TEI for the remote OMT link.
Otherwise the TEI value 0 is used.
The remote OMT link will be disconnected if a new IS configuration
configures PCM A timeslot 23 for either:
•
traffic functions
•
subchannels with bitrate other than 64 kbit/s
35.4
Operational conditions
35.4.1
Operation and maintenance
Not applicable.
35.4.2
Capabilities
The maximum number of concentration groups is 12 and the
concentration ratios 1:1 to 12:1 are supported.
The maximum scanning capacity is 24 channels per 1–second interval.
Each TRX handles two links, one OML- and one RSL-link on a
common terrestrial signalling channel.
The CMRU handles one OML link, normally on a signalling channel
shared with a TRX.
When multidrop is used only one PCM path can be used for
communication towards the BSC.
A maximum of five RBSs can be connected in a linear cascade chain.
EN/LZT 123 2697
R5A
1998-08-13
227 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
