User Manual

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:
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
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: