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CHAPTER 6 NDA-24300
Page 470
Issue 1
SYSTEM OPERATIONS
Note:
Because this 4-IMG uses multiple TSW and MUX cards, be sure to check all the circuit cards concerned,
which are in the same Switching Block. For example, if your system adopts the fully expanded system,
you must check a total of 4 TSW cards and a total of 16 MUX cards in this step.
STEP 2 Flip the MBR key on the active GT card. Refer to Figure 6-51.
Figure 6-51 Speech Path System Changeover via Active GT MBR Key
Note:
If the MBR and MB keys are turned ON (UP), the GT card is forcibly placed in a make-busy status.
Therefore, do not operate the MB key by mistake. Also, after the MBR key is flipped, be sure to return
the key to the original position (DOWN).
STEP 3 Confirm the changed lamp indications.
(1) To confirm the imposed Speech Path System changeover, check all the lamps on the cards
shown in Figure 6-52, which are in the relevant switching blocks.
Figure 6-52 LED Indications Before and After Speech Path System Changeover
Improper key operations may result in a system down. Operate the related keys, using extreme
care.
WARNING
After STEP 1 and STEP 1.5 are taken, set the MBR key
as shown below. The system changeover starts automatically.
1 2
GT (Active)
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required
MB
MBR
OPE/MB
Steady-green
Switching Block Formerly Active After Changeover
Switching Block Formerly STBY
TSW ACT
OPE/MB (DLKC)
MUX ACT
After Changeover
OFF
OFF
OFF
: Steady-ON (green)
: Steady-ON (green)
: Steady-ON (green)
TSW ACT
OPE/MB (DLKC)
MUX ACT
Steady-ON (green)
Steady-ON (green)
Steady-ON (green)
: OFF
: OFF
: OFF