Andrew MR1903D Посібник користувача - Сторінка 7

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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

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:

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-

Alarm – C

Hardware-

Alarm – E

a1 ALC-Alarm – C

a2 ALC-Alarm – E

visual

ID No 7164468

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