NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 6
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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 1:LED indications cited in Figure 6-40 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 6-44.
Figure 6-40   How to Check the...

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To perform ACT/STBY system changeover, check the lamp indicators shown in Figure 6-41, and then
operate the related key.
Note:LED indications cited in Figure 6-41 are only an example. The indicating pattern (ON/Flash/OFF) can
differ, depending on each system setting.
Figure 6-41   How to Check the 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)
MUX(PH-PC36)...

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To perform the ACT/STBY system changeover, check the lamp indicators shown in Figure 6-42, and
then operate the related key. 
Note:LED indications cited in Figure 6-42 are only an example. The indicating pattern (ON/Flash/OFF) can
differ, depending on each system setting.
Figure 6-42   How to Check LEDs and SW Keys for System Changeover (IMG2)
13 14
MUX(PH-PC36) MUX(PH-PC36)
13 14
MUX(PH-PC36)
MUX(PH-PC36)
13 14
MUX(PH-PC36) MUX(PH-PC36)...

CHAPTER 6 NDA-24307
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To perform the ACT/STBY system changeover, check the lamp indicators shown in Figure 6-43, and
then operate the related key.
Note:LED indications cited in Figure 6-43 are only an example. The indicating pattern (ON/Flash/OFF) can
differ, depending on each system setting.
Figure 6-43   How to Check LEDs and SW Keys for System Changeover (IMG3)
13 14
MUX(PH-PC36) MUX(PH-PC36)
13 14
MUX(PH-PC36)
MUX(PH-PC36)
13 14
MUX(PH-PC36) MUX(PH-PC36)
MUX(PH-PC36)...

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How to check the STATUS 7-seg. LEDs
The ACT/STBY status of CPU can be confirmed by viewing the STATUS 7-seg. 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 the active CPU...

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12.1.2 How to Control CPU Block
The ACT/STBY of 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
in the LN is changed over, the ACT/STBY of GT (in TSWM) also changes over.
See Figure 6-45.
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...

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Figure 6-45   System Block Diagram in LN (Switching Network Between CPU and GT)
ISAGT:  PZ-GT13/PZ-GT20 LANI:  PZ-PC19  GT   :  PH-GT09 TSW:  PH-SW12 MUX:  PH-PC36 
DLKC :  PH-PC20 PLO :  PH-CK16-A/17-A CLK :  PH-CK18 EMA:  PH-PC40 IOC  :  PH-IO24
TSW 00TSW 10TSW 01TSW 11TSW 02TSW 12TSW 03TSW 13
DLKC 0
IMG 0/2 IMG 1/3To/From TSW of ISWM
MUXMUXMUXMUXMUXMUXMUXMUXMUXMUXMUXMUXMUXMUXMUXMUX
TSW I/O BUS
TSW I/O BUS
DLKC 1
LANILANI
ISAGT
CPU 0
GT 1
EMAIOC/...

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12.1.3 Manual System Changeover of CPU
To change over the CPU system, the CMODI/CMOD command is normally used. However, if the com-
mand cannot be used for some reason, use the key operations listed below:
Note:For system changeover via the command, see Chapter 8.
Changeover Procedure for CPU of ISW
STEP 1 Determine which CPU is active.
(1) Check the lamp indications on the CPU Display Panel (DSP).
Figure 6-46   CPU in ACT/STBY Mode (ISW)
(2) Check...

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STEP 2 Flip the MBR key on the DSP of the active CPU.
Figure 6-47   CPU Changeover via MBR Key (ISW)
Note:
If the MBR key remains in the UP position, the CPU stays in its make-busy status. Be sure to return the
key to the DOWN position except in the case of a special purpose.
STEP 3 Confirm the changed lamp indications.
To confirm the CPU changeover, check the lamps on both DSPs. LED indications must change
as shown when the CPU system has been...

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Changeover Procedure for CPU of LN
STEP 1 Determine which CPU is active.
(1) Check the lamp indications on the CPU Display Panel (DSP).
Figure 6-49   CPU in ACT/STBY Mode (LN)
The CPU changeover also affects the ACT/ST-BY of GT(s) in the TSWM(0/1). Referring to
Figure 6-50, check the lamp indications on the GT (PH-GT09) card(s).
Figure 6-50   GT in ACT / STBY Mode (LN)
Legend
Lamp is ON
:Lamp is OFF: Lamp is Flashing: Active
IMG1 IMG2
STATUSSTATUS...