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NDA-24300 CHAPTER 5
Page 333
Issue 1
FAULT REPAIR PROCEDURES
4. UNIT FAULT
This section explains the fault repair procedure in a case where any of the faults shown in Table 5-6 has oc-
curred to all the line/trunk circuit cards mounted in a specific unit. Figure 5-4 shows the range of units.
Figure 5-4 Range of Units
Table 5-6 Unit Fault Situation
FAULT SITUATION REFERENCE SECTION
Noise, one-way speech, no tone.
Even if dialing has been made, dial tone does not stop.
Section 4.2, Unit Fault - Fault Related to Speech
Dial Tone cannot be heard. Section 4.3, Unit Fault - When Dial Tone (DT)
Cannot Be Heard
MUX card has become faulty and, as a result the CPU has changed
over.
Section 4.4, Unit Fault - ACT-Side MUX Card Is
Faulty and System Has Changed Over
FRONT VIEW
TOPU
IMG0
FANU
BASEU
LPM
MG01
MG00
TOPU
IMG2
FANU
BASEU
DUMMY
Unit 2
Unit 3
Unit 0
Unit 1
MG05
MG04
TOPU
IMG3
FANU
BASEU
DUMMY
Unit 2
Unit 3
Unit 0
Unit 1
MG07
MG06
TOPU
IMG1
FANU
BASEU
TSWM
MG03
MG02
PIM3
PIM2
PIM1
PIM0
00
MUX (PH-PC36) 0
MUX (PH-PC36) 1
PWR
PWR
Unit No. = 0/2 Unit No. = 1/3
Slot No.
PIM
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Unit 2
Unit 3
Unit 0
Unit 1
Unit 2
Unit 3
Unit 0
Unit 1
Unit 2
Unit 3
Unit 0
Unit 1
Unit 2
Unit 3
Unit 0
Unit 1
Unit 2
Unit 3
Unit 0
Unit 1
Unit 2
Unit 3
Unit 0
Unit 1