User's Manual

CHAPTER 5 NDA-24300
Page 312
Issue 1
FAULT REPAIR PROCEDURES
1.1 Check Point
When repairing a line fault, consider the following items:
(1) Check alarm lamps on line circuit cards.
(2) When an outgoing call cannot be originated to a specific line/trunk or when an incoming call cannot be
terminated from a specific line/trunk, check Tenant Restriction Data (assigned via ATNR command) and
Route Restriction Data (assigned via ARSC command).
1.2 Line Control
Each line in a specific Line circuit (LC/ELC) card is controlled by the PM in that line circuit card. The
line circuit cards are controlled from the CPU via the MUX. Figure 5-1 shows the control route of line
circuit cards.
Figure 5-1 Controlling LC/ELC Circuit Cards and Speech Path
LC
MUX
TDSW/INT
GT
ISAGT
CPU
CPR
TSW
MDF
LT Cable
LT Cable
Control Signal
Speech Path
Control Signal
LC/ELC
Ordinary Telephone/
Ordinary Telephone/
Symbols:
: Circuit Card : Speech Path
: Control Signal
TSW: PH-SW12 GT: PH-GT09
MUX: PH-PC36 ISAGT: PZ-GT13
LC
PM
MUX
LC
LT Cable
LT Cable
Control Signal
Speech Path
LC/ELC
LC
PM
D
term
D
term