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12.
Attenuation Setting
The attenuation of the miniRepeater can be set by
means of a rotary switch. There is a label on the
miniRepeater that shows the possible positions of the
rotary switch and the corresponding values of the
attenuation. The attenuation can be set, using a small
screwdriver, in the range from 0 dB to 20 dB in steps
of 2 dB or "auto setup" may be selected.
When auto setup is selected, the miniRepeater will
automatically
set
its
performance. The downlink gain will be automatically
set to operate the repeater at its maximum output
power, while not exceeding the ALC limit. The uplink
gain will be set to the value of the downlink path.
If the level of the BTS signal increases, the
miniRepeater will decrease the gain in the downlink
and
uplink
paths
automatically.
miniRepeater will increase the gain again in timely
intervals of 24 hours if the level of the BTS signal
decreases.
Rotary switch for attenuation setting
M0041AMB.doc
gain
to
maximize
However,
13.
Alarming and Supervision
13.1.
Functional Description of the Alarming-
Interface
For alarming and supervision, the miniRepeater is
provided with an alarming interface represented by
two LEDs and output contacts:
RF
LED 1
the
LED1: This
equipment status information:
off
no power feed
green
normal operation condition
orange
hardware alarm (out of defined power-
window) or LO (Local Oscillator) does
not lock
red
temperature of repeater too high
LED2: This
information about the ALC-status (Automatic
Level Control):
off
normal operation condition
red
ALC-Alarm, ALC active
13.2.
Output-Contact Configuration
Output1
(TTL level)
Output2
(Optocoupler
output)
Output3
(Optocoupler
output)
Output-contact configuration
LED 2
LEDs and output contacts
three-colour
LED
provides
one-colour
LED
provides
a3 GND
b3 Heartbeat
Hardware-
b1
Alarm – C
Hardware-
b2
Alarm – E
a1 ALC-Alarm – C
a2 ALC-Alarm – E
visual
visual
ID No 7164468
Page 7
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