The Primary Rate Interface Module
80-14005000-01
2–9
2.5.3 Major Equipment Failure
The only ‘other’ error condition - this occurs when the watchdog timer on
the card expires indicating a major problem. Software restart will then
occur (as at power up).
2.6 Status LEDs
The status LED’s are illuminated under the following conditions:
LED
Colour
Conditions
Channel in
Use (1-30)
Green
When a call is up,
i.e. the relevant channel
is in use (including when a call attempt is in
progress)
Layer 2
Green
When ISDN Layer 2 is active
RAI/Yellow
Yellow
Received RAI
AIS/Blue
Yellow
Received AIS
Red
Red
Loss of Frame Alignment
Loss of Signal
Major Equipment Failure
Talkwire
Yellow
Not used (CBUPRI/E1 only)
Master
Green
Master clocking from the ISDN is supplied
by the module to the shelf system (SBUPRI-
23 and SBUPRI-30 only)
Alert
Red
When there are outstanding ALERTs on the
SBUPRI not yet received by the Shelf
Manager Module
Table 1 - SBUPRI Status LED Activation Conditions
2.7 ISDN Interface Connection
Both European and USA ISDN interfaces are accommodated by the
SBUPRI-23 and SBUPRI-30 modules which is characterised as E1 or T1
at the time of manufacture. (The CBUPRI/E1 can only support
European E1 interface).
