The Quad Basic Rate Module
80-14004000-01
1–7
Should problems be found with long lengths of ISDN cable, the jumpers
can be put IN to enable the 120R termination resistors for each port
individually.
1.5 CBUQBR Status LEDs
The status LED’s are illuminated under the following conditions:
LED
Colour
Conditions
Channel in
Use
(B1/B2)
Green
When a call is active,
i.e. the relevant ‘B’
channel is in use (including in use for a
Talkwire call)
L 1
Green
When ISDN Layer 1 (physical activation) is
active
L 2
Green
When ISDN Layer 2 (LAPD) is active
ALERT
Red
When an ALERT is being sent to the CBUGSM
1.6 Management and Control
The CBUQBR operates in conjunction with a CBUGSM for configuration
purposes so there is no directly connected command port. Under normal
conditions the majority of commands are initiated by other application
cards so only a limited set of commands are available directly to the
user.
Please see the manual on the Shelf Systems for details of how to use
the CBUGSM.
