NEC Neax 2400 Imx System Operations And Maintenance Manual

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b6 — Call Forwarding Data Clear (See Index 232)
0/1 = No/Yes
INDEX90 b1 — Backup Call Forwarding, Individual Speed Data and Name Display Data to
HDD (see Index 304)
0/1 = No/Yes
b3 — Residual Link Detection
0/1 = No/Yes
INDEX304 b0 — Individual Speed Calling Data Saving
0/1 = Out/In Service (This data is valid when SYS1, INDEX90, b1=1)
b1 — Call Forwarding Data Saving
0/1 = Out/In Service (This data is valid when SYS1, INDEX90, b1=1)
b3 — Name...

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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...

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PLO Changeover: Though PLO is included in the switching block together with the TDSW,
MUX, and DLKC, its ACT/STBY changeover should be performed inde-
pendently by operating the MB key on the card. The changeover of PLO
does not affect any other systems.
Figure 6-37   Switching Network General Block Diagram
IMG0
TSW I/O BUS
TSW I/O BUS
CPR 0CPR 1
TSW 00
GT 0
GT 1
CPU 1
TSW 10
TSW 01
TSW 11
TSW 02
TSW 12
TSW 03
TSW 13
DLKC 1DLKC 0PLO 1
PLO 0...

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To perform the ACT/STBY system changeover, check the lamp indicators shown in Figure 6-38, and
then operate the related key.
Note 1:LED indications cited in Figure 6-38 are only an example. The indicating pattern (ON/Flash/OFF)
can differ, depending on each system setting.
Note 2:STATUS 7-seg. LED provides information on ACT/STBY status of the belonging CPU. For details on
the LED’s checking method, refer Figure 6-41.
Figure 6-38   How to Check...

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To perform ACT/STBY system changeover, check the lamp indicators shown in Figure 6-39, and then
operate the related key.
Note:LED indications cited in Figure 6-39 are only an example. The indicating patterns (ON/Flash/OFF)
can differ, depending on each system setting.
Figure 6-39   How to Check LEDs and SW Keys for System Changeover (IMG1)
13 14
MUX(PH-PC36) MUX(PH-PC36)
13 14
MUX(PH-PC36)
MUX(PH-PC36)
13 14
MUX(PH-PC36) MUX(PH-PC36)...

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To perform the ACT/STBY system changeover, check the lamp indicators shown in Figure 6-40, and
then operate the related key.
Note:LED indications cited in Figure 6-40 are only an example. The indicating pattern (ON/Flash/OFF) can
differ, depending on each system setting.
Figure 6-40   How to Check LEDs and SW Keys for System Changeover (IMG2/3)
13 14
MUX(PH-PC36) MUX(PH-PC36)
13 14
MUX(PH-PC36)
MUX(PH-PC36)
13 14
MUX(PH-PC36) MUX(PH-PC36)...

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 How to check the STATUS 7-segment LEDs
The ACT/STBY status of CPU can be confirmed by viewing the STATUS 7-segment LEDs. 
Visually check the LED indications and confirm which CPU is active in your system.
When the STATUS LEDs display any of the two-digit numbers (00 - 99), the belonging CPU is
active. If the LEDs display the three letters (S, B and Y) in rotation, the CPU system is in STBY
mode. Note that the numbers (00 - 99), displayed on...

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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...

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Figure 6-42   System Block Diagram (Switching Network Between CPU and GT)
IMG0 IMG1 IMG2 IMG3
TSW I/O BUS
TSW I/O BUS
CPR 0CPR 1
MISC BUS
IOP0
Backboard Backboard Bus
T
External Cable
TSW 00
GT 0
GT 1
CPU 1
MUXMUXMUXMUX
TSW 10
TSW 01
MUXMUXMUXMUX
TSW 11
TSW 02
MUXMUXMUXMUX
TSW 12
TSW 03
MUXMUXMUXMUX
TSW 13
DLKC 1DLKC 0PLO 1
PLO 0
ISAGT
LANILANI
ISAGT
LANILANI
IOC/
MISCEMA
CPU 0
CPU
ISAGT0
GT 1GT 0
Note:The connection between ISAGT and GT is...

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12.1.3 Manual System Changeover of CPU
To change over the CPU system, the CMOD command is normally used. However, if the command
cannot be used for some reason, use the key operations listed below:
Note:For system changeover via the command, see Chapter 8.
STEP 1 Determine which CPU is active.
(1) Check the lamp indications. Refer to Figure 6-43 and Table 6-8.
Figure 6-43   CPU in ACT/STBY Mode
The CPU changeover also affects the ACT/STBY of GT...