Andrew Wireless Innovations Group BCEL-FAST900 Manuel D’Utilisation
MN021-01
Page 11 of 28
The local unit has different monitor signals, leading to different alarms:
ALARM DESCRIPTION
LED
STATUS
SEVERITY
COLOR
UL AGC out of range
RU1, 2, 3, or 4
Flashing
MINOR
Red
UL optical power too low
RU1, 2, 3, or 4
Fixed
MAJOR
Red
DL laser optical power too low
LU
Fixed
MAJOR
Red
UL RF amplifier
LU
Fixed
MAJOR
Red
DL RF amplifier
LU
Fixed
MAJOR
Red
Temperature alarm
LU
Flashing
MINOR
Red
Supply alarm
LU
Fixed
MAJOR
Green
The Link LEDs (RU1, 2, 3, and 4) report information from the remote units, according to the
following table:
ALARM DESCRIPTION
LED
STATUS
SEVERITY
DL AGC out of range
RU1, 2, 3, or 4
Flashing
MINOR
DL optical power too low
RU1, 2, 3, or 4
Fixed
MAJOR
DL RF amplifier 1
RU1, 2, 3, or 4
Fixed
MAJOR
DL RF amplifier 2
RU1, 2, 3, or 4
Fixed
MAJOR
Antenna disconnected (DC loop)
RU1, 2, 3, or 4
Flashing
MINOR
External 1
RU1, 2, 3, or 4
Fixed
MAJOR
External 2
RU1, 2, 3, or 4
Fixed
MAJOR
6.1.
Alarm contacts
The TFLF provides dry contacts to report alarm condition to third party equipment auxiliary
inputs (i.e. BTS or repeater). The dry contacts status is reported in the following table:
inputs (i.e. BTS or repeater). The dry contacts status is reported in the following table:
ALARM CONDITION
CONTACT POSITION
NONE
OPEN
MINOR
OPEN
MAJOR
CLOSED
If the alarm condition is “none” (contact open) the relays driving the contacts are normally
excited. In case of power supply failure the system is not powered and the dry contacts will be
automatically driven to a “closed condition”, corresponding to a “major” alarm.
6.2.
UL level setting
The TFLF is designed to be compatible with most pico/micro BTS’s. The allowed levels can
span from 10mW to 5W. Power levels greater than 100mW require an external attenuator. This
external attenuator will affect both the uplink and downlink paths, adding unwanted attenuation
to the uplink path.
In this case, the variable uplink attenuator must be adjusted (the range is 20dB with 5dB steps),
as per table in the appendix E.
To adjust the value use a flat screwdriver
span from 10mW to 5W. Power levels greater than 100mW require an external attenuator. This
external attenuator will affect both the uplink and downlink paths, adding unwanted attenuation
to the uplink path.
In this case, the variable uplink attenuator must be adjusted (the range is 20dB with 5dB steps),
as per table in the appendix E.
To adjust the value use a flat screwdriver
Figure 6 Uplink Attenuator Adjustment
6.3.
Software auto-configuration
A simple procedure is required to set the final system configuration. This is necessary in case of
a partially populated system, where optical alarms can arise if some optical ports are not
connected to remote units. The procedure to be followed is reported below:
a partially populated system, where optical alarms can arise if some optical ports are not
connected to remote units. The procedure to be followed is reported below: