NEC Neax 2400 Imx System Operations And Maintenance Manual

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Figure 2-18   Speech Path Range of Fault
MUX
A fault within this range
affects this module.
32ch
A fault within this range 
affects the circuit card.A fault within this range affects two slots.
PIM 3
A fault within this range
affects this module.
32ch
A fault within this range 
affects the circuit card.A fault within this range
affects two slots.
PIM 2
A fault within this range
affects this module.
32ch
A fault within this range...

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2.7 Explanation of Terms
 C-Level Infinite Loop
The program repeatedly executes specific routines due to a fault of the main memory, data destruction,
etc. The program is not able to be processed normally. This faulty condition is referred to as Program
Infinite Loop. C-Level infinite loop is a state where a clock-level program, which runs under clock
interrupt disable state, is in an infinite loop status.
 B-Level Infinite Loop
This...

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 PM (Line/Trunk Card) Make-Busy Restart
In this processing, the faulty PM (Line/Trunk Card) is isolated from the system and, at the same time,
the calls associated with that faulty PM (Line/Trunk Card) are released. No calls related to the faulty
PM (Line/Trunk Card) are processed and the system normally runs without the faulty PM (Line/Trunk
Card).
 Data Copy Restart
In a system of dual CPU configuration, the RAM memory (including...

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Figure 2-19   3M
® Model 8012 Portable Field Service Kit
Figure 2-20   How to Hold a Circuit Card
Wrist StrapPlace the Circuit
Card on a
conductive sheet. Connect ground wire to the Earth
terminal of the Module Group.
Note:3M is a registered trademark of Minnesota Mining and Manufacturing, Inc.
12
34
OFF12
34
567
8
OFF
12
34
5
67
8
OFF
12
34
5
67
8
OFF
12
34
5
67
8
OFF
12
34
OFF
12
34
OFF
12
34
567
8
OFF12
34
5
67
8
OFF12
34
5
67
8
OFF...

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(3) When a circuit card appears to be faulty, check the following items before replacing it with a spare:
(a) Poor connector contact at the circuit card may be responsible for the fault. Repeat insertion and ex-
traction of the circuit card a few times. Clean the connector portion, and recheck for proper operation.
(b) Check the lead wires of vertically-mounted parts (resistors, capacitors, etc.) to ensure they have not
shorted each...

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(4) How to clean the connector portion (gold-plated terminal):
(a) Dip the gold-plated terminal portion in the cleaning fluid for 3 to 5 seconds (only PA-XX type circuit
card), as shown in Figure 2-22.
Figure 2-22   How to Clean the Connector Portion
Note 1:
Some of the parts are subject to damage if they come in contact with the cleansing liquid. Be careful
to allow only the connector portion (gold-plated terminal) to contact the...

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 The following is an example where the fault was recovered after the replacement of circuit cards:
(8) When a fault recovery is completed, use the RALM command to clear all the alarm indications and reg-
istered system messages. If required, restore temporary cross connections and transient data for testing to
the original ones.
3.2 How to Follow Diagnostic Procedure/Fault Repair Procedure
(a) Diagnostic Work
A fault diagnostic...

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STEP 5 Perform the work indicated by (8), and if the result of the work is the same as the status indi-
cated, the fault is indicated by (9). If the fault repair work indicated by (9) affects another nor-
mal line, recheck the work as indicated by (10).
(b) Fault Repair Procedure
A fault repair procedure is explained by means of “TREE” format in Chapter 5. The following ex-
plains how to follow the “TREE” format and proceed with...

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Figure 2-24   Diagnostic Work Items and Symbols Example
FAULT SUPERVISION START
END
WhenFAULT
Section No. (1)
:  It is the fault of 
Perform(3)
(4)
When
(5)
(2)
WhenFAULT
Section No. :  It is the fault of  (7)
When(8)with
performed
FAULT
Section No. :
(9)
CHECK OF WORK
(6)
(10)
(11) (Chapter 5)
(Chapter 5)(Chapter 5)
(11) (5)
Note:(1): Judgment of fault status
(2),(6),(7),(9): When the fault status coincides with the indication, the...

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Figure 2-25   Recovery Procedure Example
4. REPORTING FAULT TO NEC
When the cause of a fault is uncertain, make note of the situation involved and report it to NEC. When for-
warding faulty circuit cards to NEC, exercise caution to protect from static electricity.
4.1 Fault Reporting Method
The following three items must be included in the report without fail:
(1) Faulty situation (reports should be similar to “dial tone is not heard...