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CHAPTER 6 NDA-24300
Page 466
Issue 1
SYSTEM OPERATIONS
12.1.5 How to Control Switching Block
The Switching Block denoted here includes the following system equipment:
• TSW (PH-SW12)
• MUX (PH-PC36)
• DLKC (PH-PC20)
• PLO (PH-CK16/17/16-A/17-A)
Perform the required system changeover by using the CMOD command or by operating the relevant
key on the GT/PLO card. Refer to Table 6-9.
Note:
These operations cause a momentary interruption in speech paths. Since the interruption is momentary,
it can be ignored as far as ordinary telephone calls are concerned. However, care should be take when
data communications are involved, as the interruption might cause bit errors.
Table 6-9 Changeover of Switching Block
Type Operations Remarks
Speech Path Changeover by the
CMOD command
Note
Use CMOD command.
See Chapter 8.
All OPE or ACT lamps on the
Speech Path System, which were
formerly active, go OFF.
All OPE or ACT lamps on the
Speech Path System, which were
formerly STBY, light steady-
green.
Speech Path System Changeover by
Key Operation on the active GT card
Note
On active GT card, turn MBR key UP.
Return MBR key to original position (DOWN)
after OPE/MB lamp goes OFF on GT card.
See Section 12.1.6, Manual System Changeover
of Speech Path System.
All OPE or ACT lamps on the
Speech Path System, which were
formerly active, go OFF.
All OPE or ACT lamps on the
other side Speech Path System,
light steady-green.
PLO Changeover by Key Operation
Note
On active PLO card, turn MBR key UP.
Return MB key to original position (DOWN)
after ACT lamp goes OFF on PLO card.
See Section 12.1.7, Manual System Changeover
of PLO.
ACT lamp on the PLO card, which
was formerly active, goes OFF.
ACT lamp on the PLO card, which
was formerly STBY, goes steady-
green.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required