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NDA-24300 CHAPTER 6
Page 455
Issue 1
SYSTEM OPERATIONS
12. SYSTEM CONTROL PROCEDURES
Although the system is remarkably maintenance free, maintenance technicians occasionally may confront a
situation in which they have to manually control the system. This chapter describes system control procedures
focusing on the following four items.
• Changeover/Make-busy/Make-busy Cancel of Equipment
• Initialization
• How to Turn On/Off the Whole System
• System Start-up
Note:
Changeover of equipment is available for common control equipment, which is provided in a dual con-
figuration.
12.1 Changeover/Make-Busy/Make-Busy Cancel of Equipment
12.1.1 General
This section explains system operations which are necessary for Changeover/Make-Busy/Make-Busy
Cancel of equipment dividing them into the following two blocks.
• CPU Block
• Switching Block (TSW, PLO)
Prior to performing these operations, see Figure 6-37 through Figure 6-47 to obtain general under-
standing on the system configuration.
Figure 6-37 shows a general block diagram of a dual-configuration system. Referring to the diagram,
confirm the routes to be affected by any of the following operations:
CPU Changeover: The ACT/STBY of CPU can be changed over by using the CMOD com-
mand or operating the MBR key on the CPU front panel. If the system of
CPU is changed over, the ACT/STBY of GT (in TSWM), as well as of the
belonging ISAGT and LANI, are also changed over.
Note:
The changeover of CPU can be performed by operating the CPU SEL key on the EMA (PH-PC40) card.
However, this method is not normally used except in cases of unavoidable circumstances. Refer to Sec-
tion 12.1.2, How to Control CPU Block.
Speech Path Changeover: The ACT/STBY of Speech Path System can be changed over by using the
CMOD command or operating the MBR key on the active GT circuit card.
If the system of Speech Path is once changeover, all the TSW, DLKC, and
MUX in the same switching block are also totally changed over.