NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 4
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Figure 4-13   LEDs and Switches for TSW Changeover
MUX (PH-PC36)
MUX ACT
MBIOGT (PH-GT10)
TSW ACT
MBRMBDLKC (PH-PC20)
OPE/MB
MBHSW (PU-SW01)
HSW ACT
MB
FRONT VIEWTSW (PH-SW12)
TSW ACT
TSW MBRMBTSW (PU-SW00)
TSW ACT
TSW MBRTSW MB
ISWLN 

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TSW ACT lamp on the TSW card 
remains OFF.
TSW ACT lamp on the TSW card 
lights red.
TSW ACT lamp on the new card 
lights red.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
B
Set TSW MBR and MB keys on the new card UP.
A
Insert the new TSW card into the TSWM.Set the keys on the new card, 
referring to the card replaced.
Extract the TSW card to be replaced
from the TSWM. On the TSW (PH-SW12) card to be...

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Note:
This procedure assumes the Speech Path mode change is executed totally on a system basis. If the
change is required on a node basis, use the MBR key on that node’s GT (PH-GT09) card or CMODI/
CMOD command. For more details, refer to Section 12, Chapter 6.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
TSW ACT lamp on the new card goes 
OFF.
TSW ACT lamp on the new card 
remains OFF.
System Changeover...

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2.3.3 DLKC Card Replacement Procedure
The DLKC (PH-PC20) card is mounted in Slot No. 08 or 09 within the TSWM0. The card’s main
function is to provide all the Attendant/Desk Consoles with information such as termination/answer/
release (abandoned) of ATT calls or idle/busy status of a station via the link of the TSW system. Use
the following procedures to replace the DLKC card with a spare.
Note:The system changeover of DLKC...

NDA-24307 CHAPTER 4
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Note:
The changeover of Speech Path system can be performed also by using the CMODI command. For
details, refer to Chapter 8, Maintenance Commands.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
OPE/MB lamp on the new card lights red.
OPE/MB lamp on the new card goes OFF.
System Changeover
Replaced DLKC: STBY to ACT
Mate DLKC: ACT to STBY
Check the following lamp indications on the
Speech Path block to...

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2.3.4 PLO Card Replacement Procedure
The PLO (PH-CK16-A) card is mounted in Slot No. 21 or 23 within the TSWM0. Used together with
a direct digital interface circuit card, the card’s main function is to set up the clock synchronization on
the network. With this circuit card, the Local Node can be a clock subordinate office of the digital
network. Use the procedures below to replace the PLO card with a spare.
Note:The ACT/STBY of...

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OPE lamp on the new card is OFF. 
OPE lamp on the new card remains 
OFF.
(Mate PLO = ON [green])
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
END
A
Insert the new PLO card into the TSWM0. On the new PLO card, set the MB key UP.
Set the MB key on the new card DOWN. 

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2.3.5 CLK Card Replacement Procedure
The CLK (PH-CK18) card is mounted in Slot No. 21 or 23 within the TSWM1. The card’s main
function is to supply basic clock signals to IMG2/3. This card receives clock signs from the PLO
located in TSWM0, thereby distributing the supplied 32,768 MHz CLK, 8 KHz FH (5msec x “n” FH
[for Wireless system]), PLO ACT signals and Hold tone to the TSW located in TSWM1. Use the
procedures below to...

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OPE lamp on the new card is OFF. 
OPE lamp on the new card remains 
OFF.
(Mate CLK = ON [green])
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
END
A
Insert the new CLK card into the TSWM1. On the new CLK card, set the MB key UP.
Set the MB key on the new card DOWN. 

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2.3.6 PWR SW Card Replacement Procedure
The PWR SW (PH-PW14) card is mounted in Slot No. 00 or 01 within the TSWM0/1. The card’s main
function is to supply DC -48V operating power to the same TSWM circuit cards and also DC +5, -5 V
and +12 V output power to the MISC slots. Use the following procedures to replace the card with a
new one.
Replacement Procedure
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
P-ON...