Ericsson ASB 150 02 - Flow Chart: Transmission Faults

23(42)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
1999-07-15 F
1545-ASB 150 02 Uen
FAULT TRACING DESCRIPTION
Faktaansvarig - Subject responsible
2.11 Flow chart: Transmission faults
Levels
START
Acoustic oscillation?
Y
N
Installed
Y
Is the correct
session loaded?
Problem solved?
Y
AA
N
N
Replace
telephone.
board, alternatively
Fault due to an
individual e.g. in trunk
or extension?
obtainable?
Is a transmission
Report fault
(see point 4.13)
Test
line running
Fault remains?
Y
Y
AA
N
N
Y
N
meters correct?
transmission para-
(self-sustained)
No
transmission?
Y
Disturbances?
Y
One-way speech?
Fault remains?
using temporary
Run new line
network.
AA
too high or low?
Build mini-PBX com-
prising one CPU-D
and one ELU-D.
Expand PBX in stages. Use
exclusion method to replace
faulty device (board, back
plane, flat ribbon cable, etc.)
External
suspected?
Y
disturbances
N
Y
Excessive
Y
N
lines?
echo on trunk
Use RASC to set ATIA
to ON for analog trunk.
Y
N
Fault
remains?
AA
AA
= Go to " Completion of service" on page 31
N
N