NEC Neax 2400 Imx System Operations And Maintenance Manual

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(2) Check the mate CPU’s STBY mode. Also check the mate GT’s STBY mode. Refer to Fig-
ure 6-43 and Figure 6-44.
STEP 2 Flip the MBR key on the DSP of the active CPU. Refer to Figure 6-45.
Figure 6-45   CPU Changeover via MBR Key 
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...

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12.1.4 Forced Changeover of CPU
Figure 6-47 shows how to perform the forced changeover of CPU by key oper-
ation on the EMA (PH-PC40) card. Because the key operation will cause the en-
tire system to initialize, do not rely on this method except as a last resort.
Figure 6-47   Forced CPU Changeover
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
12
34
567
8
OFF
12
34
567
8
OFF
12
34
OFF
MBR
FDD ON
OFF
ON
OFF OUT PWR
IN PWR5AHDD...

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12.1.5 How to Control Switching Block
The Switching Block denoted here includes the following system equipment:
 TSW (PH-SW12)
 MUX (PH-PC36)
 DLKC (PH-PC20)
 PLO (PH-CK16/17/16-A/17-A)
Perform the required system changeover by using the CMOD command or by operating the relevant
key on the GT/PLO card. Refer to Table 6-9.
Note:These operations cause a momentary interruption in speech paths. Since the interruption is momentary,
it can be...

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12.1.6 Manual System Changeover of Speech Path System
To changeover the ACT/STBY of Speech Path System, the CMOD command is normally used. How-
ever, if for some reason the command cannot be used, use the key operations listed below.
Note 1:As explained in this section, the ACT/STBY of the Speech Path System can be changed over via the
MBR key on the GT (PH-GT09) card. Because each GT (GT0 and GT1) can control both the Speech
Path System #0 an...

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Figure 6-48   System Block Diagram (Switching Network for Speech Path System)
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
ISAGT
LANILANI
ISAGT
LANILANI
ISAGT: PZ-GT13 LANI:  PZ-PC19 GT:   PH-GT09 TSW: PH-SW12 MUX:  PH-PC36
DLKC:  PH-PC20 PLO:  PH-CK16/17/16-A/17-A
CPU 0
PCM HWPM BUSPCM HWPM BUSPCM HWPM BUSPCM HWPM BUS
MUXMUXMUXMUX Line/Trunk PMIMG1
PCM...

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STEP 1 Make sure the active Speech Path System.
(1) Check all the lamp indications in Figure 6-49, which are in the same switching block.
Figure 6-49   TSW/DLKC/MUX in ACT Mode
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...

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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...

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(2) If the system uses PH-CK16 or PH-CK17 as the PLO, make sure the active PLO and the
newly activated TSW systems are in the same Switching Block. Refer to Figure 6-53.
Because this card’s MUSIC ROM supplies hold tones only to the TSW cards that are in
the same Switching Block, be sure to check the active PLO and the newly activated TSW
systems are all in the same Switching Block. If not, perform the PLO changeover, referring
to Section 12.1.7,...

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12.1.7 Manual System Changeover of PLO
To change over the system of Phase Lock Oscillator (PLO), use the key operations listed below.
Note:Though the PLO belongs to the Switching Block as explained in Section 12.1.5, its ACT/STBY Switching
Network is separate from that of the Speech Path System. Therefore, the changeover of the PLO must
be independently performed.
STEP 1 Make sure the PLO system is active.
(1) When the PLO system is active, ACT...

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STEP 2 Flip the MB key on the PLO card. Refer to Figure 6-55.
Figure 6-55   PLO Changeover via MB Key 
Note:
If the MB key remains in the UP position, the PLO system also stays in its make-busy status. Be sure to
return the key DOWN except in the case of a special purpose.
STEP 3 Confirm the changed lamp indications.
(1) To confirm the imposed PLO changeover, check the following lamps on both PLO cards.
The LED indications must change as shown...