Andrew Wireless Innovations Group BCEL-FAST900 用户手册
MN021-01
Page 17 of 28
OPTICAL LOSS
OPERATION
ALARM
SEVERITY
0 dB
AGC working, constant RF gain
none
NONE
< 3dB
AGC working, constant RF gain
none
NONE
< 5 dB
AGC not working, RF gain
decreases according to 2dB
electrical per 1dB optical
decreases according to 2dB
electrical per 1dB optical
AGC out of range:
red LED flashes
red LED flashes
MINOR
> 5 dB
AGC not working, the optical
signal is too low, the receiver is
automatically switched off in
order to reduce the unwanted
noise to the system.
signal is too low, the receiver is
automatically switched off in
order to reduce the unwanted
noise to the system.
Optical power too
low: red LED
fixed, relays
alarmed.
low: red LED
fixed, relays
alarmed.
MAJOR
11. Alarms and settings
11.1.
Remote unit LEDs
The TFAF is fully managed and supervised by the local microprocessor. The alarms are fully
managed by software according to different severity levels, and reported as local visual alarms
(LED’s) and on the data link to the local unit.
There are 2 LED on the Local unit, one red alarm LED is related to optical link and internal
failures, one green LED is for the power supply.
managed by software according to different severity levels, and reported as local visual alarms
(LED’s) and on the data link to the local unit.
There are 2 LED on the Local unit, one red alarm LED is related to optical link and internal
failures, one green LED is for the power supply.
Figure 12 Remote Unit TFAF LED’s
REMOTE ALARM DESCRIPTION
LED
STATUS
SEVERITY
UL AGC out of range
RED
Flashing
MINOR
UL optical power too low
RED
Fixed
MAJOR
DL RF amplifier 1
RED
Fixed
MAJOR
DL RF amplifier 2
RED
Fixed
MAJOR
Antenna disconnected (DC loop)
RED
Flashing
MINOR
External 1
RED
Fixed
MAJOR
External 2
RED
Fixed
MAJOR
11.2.
External alarms
Two external alarm contacts are provided. These contacts are open under non-alarm condition.
Figure 13 Remote Unit TFAF Alarm Connectors