Service Manual

6802800U74-AN
Chapter 13: MTS Troubleshooting
390
Alarm ID
Descrip-
tion
ALM_RF_JAMMING Uplink
channel RF
interference
detected.
Recovery
Action
No recovery
action taken
by the soft-
ware.
Clear Ac-
tion
The alarm is
cleared if no
longer inter-
ference is
detected.
Notes
ALM_RF_JAM-
MING_WITH_AIH
Uplink
channel RF
interference
detected
with Auto-
matic Inter-
ference
Handler is
enabled.
Information
sent to Site
Controller.
MCCH setup
requests are
rejected by
BRC.
The alarm is
cleared if no
longer inter-
ference is
detected.
ALM_LAPD_LINK LAPD con-
nection is
down.
ALM_RX_IF1_FAULT Current
consump-
tion failure
of IF ampli-
fier in
branch 1
ALM_RX_IF2_FAULT Current
consump-
tion failure
of IF ampli-
fier in
branch 2
ALM_RX_IF3_FAULT Current
consump-
tion failure
of IF ampli-
fier in
branch 3
ALM_EX_DC_27V_FAULT Exciter DC
27V line
failure.
BRC is de-
keyed by the
software.
Receiver
Branch 1 is
disabled
Receiver
Branch 2 is
disabled
Receiver
Branch 3 is
disabled
Transmitter
is disabled
by the soft-
ware - BRC
is unable to
transmit.
The alarm is
cleared after
the LAPD
connection
is restored.
If condition
disappears
branch 1 is
enabled
If condition
disappears
branch 2 is
enabled
If condition
disappears
branch 3 is
enabled
If the alarm
condition
disappears
then trans-
mitter is re-
enabled by
the software.
The alarm may
be reported be-
cause of the link
to SC failure.
The alarm may
be reported if
current is out-
side specified
limits.
The alarm may
be reported if
current is out-
side specified
limits.
The alarm may
be reported if
current is out-
side specified
limits.
The alarm may
be reported be-
cause of some
power supply
problems (ca-
bles, connec-
tors) or the BRC
hardware fail-
ure / configura-
tion problem.