Filter
Top Products
CHAPTER 5 NDA-24300
Page 320
Issue 1
FAULT REPAIR PROCEDURES
2. TRUNK FAULT
This paragraph explains the fault repair procedure when a fault, shown in Table 5-3, has occurred to a specific
trunk.
2.1 Check Point
When repairing a trunk fault, consider the following items:
(1) Check alarm lamps on trunk circuit cards.
(2) When an outgoing call cannot be originated to a specific trunk or when an incoming call cannot be termi-
nated from a specific trunk, check Tenant Restriction Data (assigned via ATNR command) and Route Re-
striction Data (assigned via ARSC command).
(3) Three-Way Conference Trunk (CFT) is on the MUX (PH-PC36) circuit cards. If a three-way conference
call cannot be established, check the MUX cards.
(4) If the present timing for supervising the trunk/sender status is considered to be responsible for the fault,
change the timing. The specifications for timings that can be changed with respect to trunks and senders
are shown in Table 5-4 and Table 5-5.
Table 5-3 Trunk Fault Situation
TRUNK FAULTY SITUATION REFERENCE SECTION
ORT No connection can be set up.
PB/DP signals are erroneously received or cannot be received.
Section 2.3, Trunk (ORT, SND,
CFT) Fault
SND No connections can be set up.
PB/DP signals are erroneously sent out or cannot be sent out.
CFT No connections can be set up.
No three-way calling can be made.
Noise gets in an established connection.
COT
TLT
DTI
No connections can be set up.
A connection results in no speech.
Noise gets in an established connection.
Section 2.4, Trunk (COT, TLT, DTI)
Fault