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CHAPTER 4 NDA-24300
Page 286
Issue 1
UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
3.3.2 MUX 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
Apply extreme care when operating the keys on the circuit cards.
WARNING
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 4-16 and
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.
A
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.