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NDA-24300 CHAPTER 6
Page 461
Issue 1
SYSTEM OPERATIONS
12.1.2 How to Control CPU Block
The CPU, when it is provided in a dual configuration, can be switched over by
one of the operations shown in Table 6-8. If the system of CPU is changed over,
the ACT/STBY of GT (in TSWM) also changes over.
Note 1:
While changeover of the CPU is in progress, any call attempt is rejected. Already established calls,
however, will not be affected.
Note 2:
When the forced changeover is executed, the entire system is initialized. For this reason, do not use
this operation except in unavoidable circumstances.
Figure 6-42 shows a system block diagram centering upon the CPU and its controlling GT. Though the
two sides have a complicated cable connection, the controlling route of CPU 0 directly goes to GT 0,
and that of CPU 1 to GT 1. Therefore, if the system of CPU is changed over, the ACT/STBY of GT
also changes over.
Because the ACT/STBY changeover of CPU also affects the GT status, the MBR key on the GT card
is not used for GT system changeover. The key is used to switch over the Speech Path System, involv-
ing the TSW, DLKC, and MUX circuit cards. Refer to Section 12.1.6, Manual System Changeover of
Speech Path System.
Table 6-8 Changeover of CPU Block
TYPE OPERATIONS REMARKS
Changeover by
CMOD
Note 1
Use the CMOD command.
See Chapter 8.
CPU OPE lamp
lights steady green
on the DSP of the
CPU, which is
placed into act-mode
by this operation.
OPE/MB lamp of
GT (PH-GT09)
card, which is in the
controlling route,
lights green.
Changeover by key
operation
Note 1
Turn ON the MBR key on the active DSP of the active CPU. After a few
seconds, return the MBR key to the previous position.
See Section 12.1.3, Manual System Changeover of CPU.
Forced Changeover
Note 2
ACT/STBY mode of CPU can be controlled by CPU SEL key operation on the
EMA (PH-PC40) card.
UP: No. 0 system (ACT)
DOWN: No. 1 system (ACT)
Normally, this key must be placed in the center position when the CPU is
provided in a dual configuration.
See Section 12.1.4, Forced Changeover of CPU.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required