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CHAPTER 6 NDA-24300
Page 472
Issue 1
SYSTEM OPERATIONS
12.1.7 Manual System Changeover of PLO
To change over the system of Phase Lock Oscillator (PLO), use the key operations listed below.
Note:
Though the PLO belongs to the Switching Block as explained in Section 12.1.5, its ACT/STBY Switching
Network is separate from that of the Speech Path System. Therefore, the changeover of the PLO must
be independently performed.
STEP 1 Make sure the PLO system is active.
(1) When the PLO system is active, ACT or OPE lamp on the PLO card lights green. If the
LED is OFF, the system is STBY mode.
(2) Check the mate PLO’s STBY mode. Refer to Figure 6-54.
Figure 6-54 PLO in ACT/STBY Mode
Improper key operations may result in a system down. Operate the related keys, using extreme
care.
WARNING
The changeover of PLO system can be done only when the mate PLO is in STBY mode. Do
not attempt the changeover if the mate PLO is closed.
WARNING
PLO (Front View)
PLO: Active PLO: STBY
MB
PLO
green
MB
Legend
Lamp is ON
:
Lamp is OFF
:
ACT/OPE Note ACT/OPE Note
PH-CK16
PH-CK17
PH-CK16-A
PH-CK17-A
PLO
PH-CK16
PH-CK17
PH-CK16-A
PH-CK17-A
Note:
ACT lamp for PH-CK16/PH-CK17, OPE lamp for PH-CK16-A/PH-CK17-A.