Andrew ION-B Series, User Manual

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58 ION-B User Manual
TFAM
Case B
the Supervision Systems, and not through LEDs. Minor alarms detect
critical situations which should be checked and tested in order to avoid
future possible system faults.
Each Remote Unit is provided with an AGC system which comes in after
the optical-to-RF conversion. This AGC is able to correctly compensate
optical losses when these are estimated to be <3.5 dB. In case optical
losses are > 3.5dB, the LMT application and the ION-B supervision unit
will display a “Warning” alarm: the whole system still work, but AGC is
near to its borderline levels.
The red LED switches on when the estimated optical losses are >4.5 dB,
the AGC not being able to compensate these losses any more.
ALARM CODE
(TSUN
description)
ALARM
DESCRIPTION
ACTIVE LED
SUPERVISION
PRIORITY
LEVEL
ACTION
RECOMMENDED
RELÉ PRIORITY
LEVEL
(subrack)
Antenna DC
loop alarm
ALWAYS OK
DL optical
power fail
1
The optical power
received on the
DL is too low and
can’t no more be
compensated
RED MAJOR
Check the DL fi bre
and the TFLN laser
status
MAJOR
AGC out of
range
1
The optical power
received is under
the allowed
3dB optical loss
but it can be
compensated
NONE WARNING
Clean optical
connectors
MINOR
DL RF alarm
in Band 1
HW failure on the
DL low band RF
section
RED CRITICAL Return the unit MAJOR
DL RF alarm
in Band 2
HW failure on the
DL high band RF
section
RED CRITICAL Return the unit MAJOR
DL RF alarm
in Band 3
(if present)
HW failure on the
DL UMTS band RF
section
RED CRITICAL Return the unit MAJOR
External 1
alarm
Alarm on the
device connected
on dry-contact 1
RED MAJOR
Check the
external device or
alarm connection
MAJOR
External 2
alarm
Alarm on the
device connected
on dry-contact 2
RED MAJOR
Check the
external device or
alarm connection
MAJOR
Power supply
alarm
UPS HW failure or
malfunction.
RF is turned OFF
RED MAJOR
Check the
external PSU.
If it works properly,
return the unit
MAJOR
Internal BUS
alarm
A malfunctioning
on the digital
part involves a
fault in monitoring
functionalities
RED CRITICAL Return the unit MAJOR
Temperature
alarm
Over-temperature
alarm
NONE MINOR
Check ventilation
and environment
MINOR
Table 3.3.2: Description of the alarms of the Case-B Remote Unit, as they
are presented by the LMT application or by the Supervision interface
0dBm
-3.5dBm
-4.5dBm
Fig. 3.3.13:
AGC thresholds
vs LED alerts
Normal
Warning
Alarm