Nortel Networks NN43001-318 User Manual

Configuring ISDN BRI hardware

•

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.

Repeat the steps for each MISP.

—End—

Procedure 16

Removing the MISP

Step

Action

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.

Carefully remove the MISP from its card slot.

—End—

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.

Use the following guidelines when installing the clock controller on the MISP:

•

If the primary reference clock source comes from a PRI or DTI, then the
clock controller is a daughterboard on the DTI/PRI card.

Nortel Communication Server 1000

ISDN Basic Rate Interface Installation and Commissioning

NN43001-318

01.02

Standard

Release 5.0

20 June 2007