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NDA-24300 CHAPTER 4
Page 279
Issue 1
UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
2.3.4 PLO Card Replacement Procedure
The PLO (PH-CK16/17/16-A/17-A) card is located in Slot No. 21 or 23 within the TSWM. Used to-
gether with a different direct digital interface circuit card, the card’s main function is to set up the clock
synchronization on the network. In addition, the MUSIC ROM supplies the hold tone to each station
line via the TSW circuit card. Use the procedures below to replace the PLO card with a spare.
Note:
The ACT/STBY of PLO can be changed over via a single MB key operation on the circuit card. Though
its circuit is controlled by the GT (PH-GT09) card via TSW I/O bus, the switching system of PLO is not
affected by the speech path system changeover, differing from other echelons such as TSW, MUX,
DLKC. Refer to Section 12, System Control Procedures, in Chapter 6.
Replacement Procedure
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
• PLO system is changed over from
ACT to STBY mode.
• OPE lamp on the PLO card goes
OFF.
Check the mate PLO card's following
lamp indication:
• OPE = Steady-green
A
START
Extract the PLO card to be replaced
from the TSWM.
Check the mate PLO's ACT mode.
On the PLO (PH-CK16/17/16-A/17-A) card to be
replaced, set the MB key UP.
Set the keys on the new card according to
the card replaced.