Nortel Communication Server 1000M, Installation And Configuration Manual

Page: 61 / 122

Configuring ISDN BRI hardware Page 61 of 120
ISDN Basic Rate Interface Installation and Configuration
3 Insert the MISP into the selected card slot and lock it in place.
4 Observe the behavior of the LED on the faceplate of the MISP to
determine its status:
• The LED lights, flashes three times and then stays lit – the MISP is
operating correctly but is not configured and enabled.
• The LED lights, flashes three times and then turns off – indicates the
MISP is operating correctly and is configured and enabled.
• Any other LED behavior indicates a defective MISP circuit card.
Note: The Flash ROM can become corrupted if loss of power occurs
during programming of the Flash ROM. If this occurs, the Flash ROM
automatically re-initializes when the MISP is installed and powered up.
The automatic re-initialization delays the completion of the self-test, and
it takes five minutes for the LED to flash three times.
5 Repeat the steps for each MISP.
End of Procedure
Procedure 15
Removing the MISP
1 Hold the MISP by its card-locking devices. Squeeze the tabs to unlatch
the card-locking devices and lift the tabs out and away from the card.
2 Carefully remove the MISP from its card slot.
End of Procedure
Installing the clock controller on the MISP (for trunking
applications)
A clock controller is only required for ISDN BRI trunk applications. The system
supports a single active clock controller. This clock controller can support a
primary and a secondary reference clock. These reference clock sources are
derived from BRI spans or DSLs (DSL 0 and/or DSL 1).
A clock controller is required in every cabinet or MG 1000S that contains a
digital trunk.
The line cards associated with BRI DSLs used as clock references are
installed in the Small System main cabinet or Media Gateway.