2.4 Trunk (COT, TLT, DTI) Fault

Note 1: If a circuit card is replaced because only one line is faulty, any other lines in that circuit card cannot be used until the replacement is complete.

Note 2: If the polarities of the external line is reversed, it is detected in the form of Trunk Ineffective Hold.

START

FAULT REPAIR PROCEDURES

ATTENTION

Contents

Static Sensitive

Handling

Precautions Required

When OPE lamp on the trunk circuit card does not illuminate

When BL lamp is flashing or illuminating on the trunk circuit card

A

Confirm that MB switch of the trunk circuit card is in ON position (UP side).

Confirm that trunk data (ATRK command) in the trunk circuit card is assigned.

Replace trunk circuit card with a spare.

Confirm that MB switch of trunk circuit card is in ON position (UP side).

Use MBTK command to confirm that trunk circuit card has not been placed into make- busy state.

Check trunk data (ATRK command) assignment.

Replace trunk circuit card with a spare.

NDA-24300CHAPTER 5

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Issue 1

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NEC NDA-24300 manual Trunk COT, TLT, DTI Fault