NEC Neax 2400 Imx System Operations And Maintenance Manual

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3.3 Operating Procedures
The following sections provide operating procedures to replace circuit cards mounted in the PIM. Perform
the operations corresponding to each Reference Item specified in Table 4-3. Note that the procedures as-
sume that the system adopts the dual configuration.
Table 4-3  PIM Circuit Cards and Reference Items
CIRCUIT CARD 
FUNCTION NAMEREFERENCE ITEM REMARKS
LC/TRKSection 3.3.1, LC/TRK Circuit Card...

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3.3.1 LC/TRK Circuit Card Replacement Procedure
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 Keep MB switch set at UP.
END
START
Extract the circuit card from its mounting slot. On the circuit  card to be replaced, 
set the MB switch UP.
Insert the new card into its mounting slot.
On the new card, set MB switch DOWN. 

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3.3.2 MUX Card Replacement Procedure
The MUX (PH-PC36) card is mounted in Slot No. 13 and/or 14 of each Port Interface Module (PIM).
The card’s main function is to provide an interface between the CPR and Port Microprocessor (PM) of
the line/trunk circuit, and also to provide an interface for multiplexing/de-multiplexing of voice Pulse
Code Modulation (PCM) information and digital data information. Use the procedures below...

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 MUX ACT lamp on the new card is 
red.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
B
Insert the new card into the PIM.
A
On the new card, set the MB key UP.
Extract card to be replaced from the mounted PIM. Disconnect the cable for the MUX front
connector on the card to be replaced.
Connect the disconnected cable to the 
MUX front connector on the new card. 

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Note:
The changeover of Speech Path System can be performed also by using the CMOD command. For
details, refer to Chapter 8, Maintenance Commands.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
System Changeover
Replaced MUX: STBY to ACT
Mate MUX: ACT to STBY
Check all the following lamp indica-
tions on the Speech Path block to
which the new MUX card belongs
and ensure that they are all steady-
green:
...

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3.3.3 SDT Card Replacement Procedure
The SDT (PA-SDTA/PA-SDTB) card, mounted in a universal slot of a PIM, is used
to provide a 52M interface for the optical fiber lines. Use the following procedure
to replace the SDT card with a spare.
Procedure to Replace Optical Fiber Cable
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
While this card is...

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ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 OPE lamp on the PA-SDTA card is 
steady-green.
END
A
Remove the optical fiber cable from the front 
connector on the PA-SDTA card.
Connect the new optical fiber cable to the front 
connector on the PA-SDTA card.
On the PA-SDTA card, set the MB key DOWN 
(=OFF) and turn OFF Switch 4 of the P-SW key. 

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Procedure to Replace PA-SDTA/PA-SDTB card
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 ACT lamp on the PA-SDTA card 
goes OFF.
 Though any call attempt is rejected, 
already established calls are safely 
maintained. When any connection 
link exists, the link is maintained.
Note:When the card is in a dual
configuration, perform this
for both system sides, in the
order of STBY → ACT.
 OPE lamp on the...

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ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 OPE lamp on the PA-SDTB card is 
red.
 When any connection link exists, the 
nailed-down connection between the 
FCH (PA-FCHA) and SDT (PA-
SDTB) cards is cut off. Already 
established calls, while in speech, 
are all disconnected.
 Confirm that the MB key on the new 
card is set UP (=ON). If the new card 
is PA-SDTA, also confirm that 
Switch 4 of the...

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ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 OPE lamp on the new card is red.
 OPE lamp on the new card is steady-
green.
END
B
On the PA-SDTA card, turn OFF Switch 4 of the
P-SW key. Note 2 Insert both PA-SDTA/PA-SDTB cards (including new
card) simultaneously into the same slots of the PIM. When the new card is PA-SDTB, also connect the MT
24 TSW cables to all the required front connectors.
On the...