Nortel Networks 553-3001-211 manual NTAK93 self-test, DTI/PRI local self-test

NTAK09 1.5 Mb DTI/PRI card Page 701 of 894

NTAK93 self-test

The NTAK93 DCHI daughterboard LED is the bottom LED on the faceplate of the NTAK09 DTI/PRI card.

The NTAK93 DCHI daughterboard does not perform a self-test when power is applied to it. When power is applied, it turns red and remain steadily lit, indicating the DCH is disabled. When the DCH is enabled, the LED turns green and remains steadily lit.

Self-tests of the NTAK93 daughterboard are invoked manually by commands in LD 96.

DTI/PRI local self-test

The local self-test, also called a local loopback test, checks speech path continuity, zero code suppression, remote alarm detection, and A & B bit signalling. This test is performed manually on a per-loop or per-channel basis. The local loopback test performs a local logical loopback and does not require any external loopback of the T1 signal.

Restrictions and limitations

The DCHI and DTI/PRI must be disabled before performing the self-test on the entire DTI/PRI card. Individual channels must be disabled before performing a self test on a particular channel.

Power requirements

The DTI/PRI obtains its power from the backplane, and draws less than 2 amps on +5 V, 50 mA on +12 V and 50 mA on –12 V.

Foreign and surge voltage protection

Lightning protectors must be installed between an external T1 carrier facility and the system. For public T1 facilities, this protection is provided by the local operating company. In a private T1 facility environment (a campus, for example), the NTAK92 protection assembly can be used.

Circuit Card Description and Installation