Check Point (2/2) - NEC Univerge SV8500 Operation And Maintenance Manual

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Check Point (2/2)

When repairing a unit fault, consider the following items:

(1) Speech paths and control paths in the unit are connected to line/trunks via the MUX circuit cards. Be sure

to check the alarm lamps on the MUX circuit cards, and check to see if the front cable between each MUX

circuit card and TSW circuit card is connected correctly. Figure 5-11 and Figure 5-12 show the block dia-

gram within the unit.

(2) The MUX circuit cards are operating in the ACT/STBY modes under control of the CPU circuit. When the

ACT-side CPU has detected a fault in the ACT-side MUX circuit card, CPU changeover is executed and

the ACT/STBY mode of the Speech Path System is also changed over. When both of the MUX circuit cards

have become faulty, all the lines/trunks in that unit are placed into make-busy state. (If a PFT circuit card

is located in that specific unit, the PFT is activated.) Figure 5-13 shows the location of the MUX cards.

(3) When both units in a specific PIR are faulty, it is possible that the PWR circuit card mounted in that specific

PIR is faulty. In such a case, refer to

Figure 5-11 Unit Control Block Diagram (Dual Configuration)

: Circuit Card

: Control on ACT/STBY of Speech Path Systems

: Control on ACT/STBY of Clock Systems

Section 4.9, Power Supply

Circuit Card

Operation Procedure for System with PIR

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