NEC Neax 2400 Ipx System Operations And Maintenance Manual

							NDA-24307 CHAPTER 6
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SYSTEM OPERATIONS
(2) Check the mate CPU’s STBY mode. Also check the mate GT’s STBY mode. Refer to
Figure 6-50. 
STEP 2 Flip the MBR key on the DSP of the active CPU.
Figure 6-51   CPU Changeover via MBR Key (LN)
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 correctly changed over.
Figure 6-52   LED Indications Before and After CPU Changeover (LN)
STEP 4 Analyze the displayed system messages.
After STEPs 1 through 3 are performed, the system messages [7-C] and [7-D] automatically
display. Confirm that no errors occurred during the CPU changeover process.
Note:When the CPU mode change executes, the MAT (TCP/IP) is once disconnected. Then, log in to the
system again.The system changeover of CPU can be done only when the mate CPU is in STBY mode. Do
not attempt the changeover if the mate CPU is closed.
WAR NI NG
After the above steps, set the MBR key as shown below.
The system changeover starts automatically.
12
34
567
8
OFF
12
34
567
8
OFF
12
34
OFF
4C026AE
12
DSP (Active)
STATUS 
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
CPU Formerly Active After Changeover
CPU Formerly in STBY ModeCPU OPE
IMG0
IMG1-3
MB/OPE (GT Card)   
After ChangeoverOFF
Flash (green)
OFF
OFF : Steady-ON (green)
: Flash (green)
: Flash (green)
: Steady-ON (green)
CPU OPE
IMG0
IMG1-3
MB/OPE (GT Card)   Steady-ON (green)
Steady-ON (green)
Flash (green)
Steady-ON (green) : OFF
: Flash (green)
: OFF
: OFF 
						

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SYSTEM OPERATIONS
12.1.4 Forced Changeover of CPU
Figure 6-53 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. The
LPM is mounted in the LN as as example.
Figure 6-53   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 SW
MB
SYSTEM SELECT0
SENSE SYSTEM SELECT1
SYSTEM SELECT2
CPURST
SLOT No.    0 1 2 3 4 5 6 STATUS IMG1 IMG2 IMG3 CPUOPE
WDTIMG0
ON
ON
ON4C026AE
12
34
567
8
OFF
12
34
567
8
OFF
12
34
OFF
MBR
FDD ON
OFF
ON
OFF OUT PWR
IN PWR5AHDD SW
MB
SYSTEM SELECT0
SENSE SYSTEM SELECT1
SYSTEM SELECT2
CPURST
SLOT No.    0 1 2 3 4 5 6 STATUS IMG1 IMG2 IMG3 CPUOPE
WDTIMG0
ON
ON
ON4C026AE
00 01 02 03 04
MISC MISC/IOC IOC(PH-IO24) EMA(PH-PC40)MISC
LPM
CPR
LANI(PZ-PC19)ISAGT(PZ-GT13)
For the forced system changeover, set the CPU-SEL
switch from middle to Up or Down. Note this operation
also leads to system initialization.
1) UP
2) MIDDLE
3) DOWN
For more information, see the Circuit Card Manual.: The CPU#1 is placed into the ACT-side.
: Normal setting for dual CPU configuration.
: The CPU#0 is placed into the ACT-side.
  (This setting is mandatory for single CPU
   system.)
UP
MIDDLE
DOWN
CPU-SEL KeySW A0
SW92 SW73
SW70SW62
SW65
OPE/MB
      MB
ACT1
CKERR1
ACT0
CKERR0
EMASUP
EMASUP
CPU SEL
NMI SELCPU-SEL
EMA(PH-PC40) FACE LAYOUT
ISAGT(PZ-GT20)PZ-PW92PZ-IO27
Note 2
Note 1
Note 1:PZ-GT20 card is mounted in the CPR of LN only.
Note 2:In place of PZ-IO27, the CPR may be quipped with PZ-IO28, which does not have the MB key. 
						

							NDA-24307 CHAPTER 6
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SYSTEM OPERATIONS
12.1.5 How to Control Switching Block
The Switching Block denoted here includes the following system equipment:
In LN In ISW
TSW (PH-SW12) IOGT (PH-GT10)
MUX (PH-PC36) TSW (PU-SW00)
DLKC (PH-PC20) HSW (PU-SW01)
PLO (PH-CK16-A) PLO (PH-CK16-A/17-A)
CLK (PH-CK18)
GT (PH-GT09)
Perform the required system changeover by using the CMODI/CMOD command or by operating the
relevant key on the IOGT/PLO card. Refer to Table 6-9.
Note:The changeover of IOGT completely affects the whole system denoted in this section, except for the GT,
PLO, and CLK. If the Speech Path System is changed over, be sure to make a follow-up check to see if
the whole related systems (TSW, HSW, MUX, DLKC) are securely changed over. (The check can be
made by a simple glimpse at the OPE or ACT lamps on each circuit card)
Table 6-9  Changeover of Switching Block 
Type Operations Remarks
Speech Path Changeover by the 
CMODI command
Note 1Use the CMODI command (for the changeover 
on both system/node basis by logging in to ISW)
or
Use CMOD (for the changeover only on a node 
basis)
See Chapter 8.All the OPE or ACT lamps on the 
Speech Path System, except the 
GT, PLO and CLK cards, which 
were formerly active, go OFF.
All the OPE or ACT lamps on the 
Speech Path System, except the 
GT, PLO and CLK cards, which 
were formerly STBY, light steady-
green.
Speech Path System Changeover 
by Key Operation on the active 
IOGT card
Note 1On the active IOGT card, turn the MBR key UP.
Note 2
Return the MBR key to the original position 
(DOWN) after the TSW ACT lamp goes OFF on 
the IOGT card.
See Section 12.1.6, Manual System Changeover 
of Speech Path System.All the OPE or ACT lamps on the 
Speech Path system, except GT, 
PLO and CLK cards, which were 
formerly active, go OFF.
All the OPE or ACT lamps on the 
other side Speech Path System, 
except the GT, PLO and CLK 
cards light steady-green.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required 
						

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SYSTEM OPERATIONS
Note 1:
These operations cause a momentary interruption in speech paths. It can be ignored as far as ordinary
telephone calls are concerned. Since interruption might cause bit errors, care should be take when
data communications are involved.
Note 2:When changing over the Speech Path System on a node basis, flip the MBR key on that node’s GT (PH-
GT09) card. Refer to Figure 6-38.
PLO and CLK Changeover in the 
ISW/LN by Key Operation
Note 1
On the active PLO card in ISW/LN, turn the 
MBR key UP.
Return the MB key to the original position 
(DOWN) after the OPE lamp goes OFF on the 
PLO card.
See Section 12.1.7, Manual System Changeover 
of PLO/CLK.The OPE lamp on the PLO/CLK 
card, which was formerly active, 
goes OFF.
The OPE lamp on the PLO/CLK 
card, which was formerly STBY, 
goes steady-green. Table 6-9  Changeover of Switching Block  (Continued)
Type Operations Remarks 
						

							NDA-24307 CHAPTER 6
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SYSTEM OPERATIONS
12.1.6 Manual System Changeover of Speech Path System
To changeover the ACT/STBY of Speech Path System, the CMODI/CMOD command is normally
used. However, if for some reason the command cannot be used, use the key operations listed below.
Note 1:The command CMOD cannot be used to change over the Speech Path mode on a system basis. This
command is only for the changeover on each node basis.
Note 2:This section gives a detail on how to change the Speech Path mode on a system basis. When the mode
change is necessary on a node basis, flip the MBR key on the GT (PH-GT09) card in that node’s
TSWM0. For more information, refer to Figure 6-38 or the Installation Manual.
Figure 6-54   System Block Diagram (Switching Network for Speech Path System)
< ISW (Inter-node Switch) >
ISAGT:  PZ-GT13           LANI:  PZ-PC19                      IOGT:  PH-GT10         TSW:  PU-SW00
HSW:  PU-SW01            PLO:  PH-CK16-A/17-A          EMA:  PH-PC40           IOC:  PH-IO24
< LN (Local Node) >
ISAGT-A:  PZ-GT13           ISAGT-B:  PZ-GT20          LANI:  PZ-PC19           GT:  PH-GT09             TSW:  PH-SW12          MUX:  PH-PC36 
DLKC:  PH-PC20               PLO:  PH-CK16-A            CLK:  PH-CK18            EMA:  PH-PC40          IOC:  PH-IO24
TSWM0TSWM1
MISCIOCEMA
PLO
TSW00TSW01TSW02TSW03
GT
ISAGT-A
CPULANI
Fusion Link
ISW
LN0
  To PLO of
LN1 through 3
DLKCPLO
IOGT
ISAGT
CPU
LANI
To MUX
(IMG1)To MUX
(IMG2)To MUX
(IMG3)
CLK
TSW01TSW02TSW03HSW00
To TSW
of LN3 To TSW
of LN1To TSW
of LN2          
  To LANI of
LN1 through 3
HSW01TSW00
Line/Trunk PM
IMG 0
PM BUS
PCM HWPM BUS
PCM HWPM BUS
PCM HWPM BUS
PCM HW
MUXMUXMUXMUX
MISCIOCEMA
TSW00TSW01TSW02TSW03
GT
ISAGT-B
Note:If the MBR key is once flipped on the active IOGT card, all the Speech Path related systems (TSW,
HSW, DLKC and MUX) in the same switching block are totally changed over. However, the ACT/
STBY of GT (PH-GT09 in LN) and PLO/CLK in both ISW and LNs are not affected. 
						

							CHAPTER 6 NDA-24307
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SYSTEM OPERATIONS
STEP 1 Confirm the active Speech Path System.
(1) Check all the lamp indications below, which are in the same switching block.
Figure 6-55   IOGT/TSW/HSW/DLKC/MUX in ACT Mode
(2) Confirm the STBY mode of mate Speech Path System. Check all the lamp indications be-
low, which are in the same switching block.
 
Figure 6-56   IOGT/TSW/HSW/DLKC/MUX in STBY Mode
 TSW: Active
TSW MBTSW MBR TSW ACT
green
 HSW: Active
MB
HSW ACT
green
 IOGT: Active
MBMBR TSW ACT
green
 MUX: Active
MUX ACT
MB
green
 TSW: Active
MBTSW MBR TSW ACT
green
 DLKC: Active
     PU-SW00      PU-SW01      PH-GT10     PH-PC36     PH-SW12      PH-PC20
OPE/MB
MB
green
Circuit Cards in ISWCircuit Cards in LN
Legend
Lamp is ON :
Lamp is ON :
Note:Be sure to check all the circuit cards in the same Switching Block referring to the lamp indications
above.
The ACT/STBY of Speech Path System can be changed over only when the mate system is
in STBY mode. Do not attempt the changeover if the mate Speech Path System is closed.WARNING
 TSW: ST-BY
TSW MBTSW MBR
TSW ACT
 HSW: ST-BY
MB
HSW ACT
 IOGT: ST-BY
MBMBR
TSW ACT
 MUX: ST-BY
MUX ACT
MB
 TSW: ST-BY
MBTSW MBR
TSW ACT
 DLKC: ST-BY
OPE/MB
MB
Legend
Lamp is OFF :
Lamp is OFF:
ISW
LN
     PU-SW00      PU-SW01      PH-GT10     PH-PC36     PH-SW12      PH-PC20
Note:Be sure to check all the circuit cards in the same Switching Block referring to the lamp indications
above. 
						

							NDA-24307 CHAPTER 6
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SYSTEM OPERATIONS
STEP 2 Flip the MBR key on the active IOGT card in ISW.
Figure 6-57   Speech Path System Changeover via Active IOGT MBR Key
Note:
If the MB key is turned ON (UP), the IOGT 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 6-58, which are in the relevant switching blocks. Improper key operations may result in a system down. Operate the related keys, using extreme
care.
WARNING
After the above steps, set the MBR key as shown below.
The system changeover starts automatically.
12
IOGT (Active)
ATTENTIONContents
Static Sensitive
Handling
Precautions RequiredMBMBR OPE/MB
Steady-green 
						

							CHAPTER 6 NDA-24307
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SYSTEM OPERATIONS
Figure 6-58   LED Indications Before and After Speech Path System Changeover
STEP 4 Analyze the displayed system messages.
After STEPs 1 through 3 are performed, the system messages [7-E], [7-F], and [1-T] will
automatically display. Confirm that no errors occurred during the Speech Path System
changeover process.
Note:When the Speech Path System changeover is executed in each LN independently, the system messages
to be displayed at this time are 7-E, 7-F, and 1-T.
Switching Block Formerly Active After Changeover
TSW ACT (IOGT card): Steady-ON (green) OFF
TSW ACT (TSW card) : Steady-ON (green) OFF
HSW ACT (HSW card): Steady-ON (green) OFF
Switching Block Formerly stby After Changeover
TSW ACT (IOGT card): OFF Steady-ON (green)
TSW ACT (TSW card) : OFF Steady-ON (green)
HSW ACT (HSW card): OFF Steady-ON (green)
LED Indications at the ISW
Switching Block Formerly Active After Changeover
TSW ACT (TSW card) : Steady-ON (green) OFF
MUX ACT (MUX card) : Steady-ON (green) OFF
OPE/MB (DLKC card) : Steady-ON (green) OFF
Switching Block Formerly stby After Changeover
TSW ACT (TSW card) : OFF Steady-ON (green)
MUX ACT (MUX card) : OFF Steady-ON (green)
OPE/MB (DLKC card) : OFF Steady-ON (green)
LED Indications at the LNs 
						

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SYSTEM OPERATIONS
12.1.7 Manual System Changeover of PLO
To change over the system of Phase Lock Oscillator (PLO)/Clock (CLK), use the key operations listed
below at a specific LN/ISW.
Note:Though the PLO/CLK 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/CLK must be independently performed at each LN/ISW.
STEP 1 Confirm the active PLO. When performing the changeover at the LN, also check the active
CLK.
(1) Check the lamp indications.
Figure 6-59   PLO/CLK in ACT/STBY Mode
(2) Check the mate PLO’s STBY mode. When performing the changeover at the LN, check the
mate’s CLK’s STBY mode. Improper key operations may result in a system down. Operate the related keys, using extreme
care.
WAR NI NG
PH-CK16-A/17-A, PH-CK18 (Front View)
 PLO/CLK: Active  PLO/CLK: ST-BY
MB
PLO (PH-CK16-A/17-A)
CLK (PH-CK18)PLO (PH-CK16-A/17-A)
CLK (PH-CK18)
green
MB
Legend
Lamp is ON
:Lamp is OFF:
OPE OPE
Note:ACT/STBY of PLO can be changed over on a node basis, not on a network/system basis. Therefore,
check the PLO/CLK cards only in that specific LN/ISW. Refer to Figure 6-37 and Figure 6-38.
The changeover of PLO/CLK system can be done only when the mate PLO/CLK is in STBY
mode. Do not attempt the changeover if the mate PLO/CLK is closed.WAR NI N G 
						

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STEP 2 Flip the MB key on the PLO card.
Figure 6-60   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 affirm the imposed PLO changeover, check the following lamps on both PLO cards. The
LED indications must change as follows when the PLO system has been correctly changed
over. When performing the changeover at the LN, check the CLK’s lamps.
Figure 6-61   LED Indications Before and After PLO/CLK Changeover
STEP 4 Analyze the displayed system messages.
After STEPs 1 through 3 are performed, the system messages [7-U] and [7-V] will
automatically display. Make sure that no errors occurred during the PLO changeover process.
After the above steps, set the MB key as shown below.
Then, the system changeover starts automatically.
12
PLO: Active MB key
ATTENTIONContents
Static Sensitive
Handling
Precautions RequiredMB OPE
PLO/CLK Formerly Active After Changeover
PLOCLK Formerly in STBY Mode After Changeover
OPE:  Steady-ON (green)
OFF
OPE:       OFF
Steady-ON (green)