coMsat Multichannel PRA

Multichannel PRA
3 operator forbidden
An example follows:
Question: I want different GSM channels to log in to different GSM base stations.
For example channels 1-8 should log in to base station A, channels 9-
16 should log in to base station B. Are there any parameters to specify
the preferred cell ID?
Answer: The selection of the cell is in the responsibility of the GSM network. The
decision concerning handover procedures to other cells is made by
measurements performed by the mobile equipment which may be
manipulated to force the login to a pre-selected cell.
Anyway, this may result in poor signal quality and is no good style.
Such procedures are not supported by the Multichannel PRA.
8.3 ISDN
Instead, you should use different directional antennas (see there).
Question: How long can the connection cable between the PBX and the
Multichannel PRA be? What cable should I use?
Answer: Using CAT 5 cable you can have a length of 100 meter.
Refer to section “Connector Assignments” if you have to cross the cable
or your PBX does not have standard assignment.
Question: I connected the PRI Interface of my PBX to the Multichannel PRA but
the red LED “LOS” (Loss of signal) is on.
Answer: The pinout of the PRI lines of the Multichannel PRA is for use as TE
(1,2=Rx, 4,5=Tx).
When the PBX does use the same pinout you have to use a cross cable
(1,2 crossed to 4,5 and vice versa).
There are also devices on the market that use a pinout similar to the
ISDN S0 (3,6/4,5).
Check the pinout of the PBX and refer to section “Connector
assignments”.
Question: The PRI port of the Multichannel PRA is connected and the green LED
“SYNC” indicates that the signal is present and the synchronization
works.
Nevertheless the interface does not works properly. There seem to be
problems in layer 2.
date: page: file:
15.02.2008 10:32 94 Manual coMsat Multichannel PRA 3-3 eng.doc
Note Protection Mark according to DIN 34!