NEC NDA-24300 manual MUX Card Replacement Procedure

UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE

3.3.2MUX Card Replacement Procedure

The MUX (PH-PC36) card is mounted in Slot No. 13 and/or 14 of each Port Interface Module (PIM). The card’s main function is to provide an interface between the CPR and Port Microprocessor (PM) of the line/trunk circuit, and also to provide an interface for multiplexing/de-multiplexing of voice Pulse Code Modulation (PCM) information and digital data information. Use the procedures below to re- place the MUX card with a spare:

Note: Execute the system changeover of MUX by using the MBR key operation on the active GT (PH-GT09) card or by using the CMOD command. Before starting this task, be sure to confirm the system block diagram shown in Figure 4-16, or Section 12, System Control Procedures, in Chapter 6.

MUX Card Replacement Procedure

WARNING Apply extreme care when operating the keys on the circuit cards.

START

On the active GT (PH-GT09) card, set the MBR key UP. Then, return the key DOWN.

Check the mate GT block's ACT mode.

On the MUX (PH-PC36) card to

be replaced, Set the MB switch UP.

A

ATTENTION

Contents

Static Sensitive

Handling

Precautions Required

System Changeover

Check the following lamp indications on the circuit cards to be affected and ensure that they are all OFF:

•TSW ACT (TSW cards)

•OPE/MB (DLKC card) Note

•MUX ACT (MUX cards)

Note: If the MUX card to be replaced represents system status #0, all circuit cards with #0 status are totally affected. Check the cited cards’ lamp indications. Refer to Figure 4-16and Figure 4-17.

Check the following lamp indications on the mate Speech Path Block and en- sure that they are all steady-green:

•TSW ACT (TSW cards)

•OPE/MB (DLKC card)

•MUX ACT (MUX cards)

MUX/ACT lamp on the DLKC card is red.

CHAPTER 4 NDA-24300

Page 286

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