Motorola Starline SG 2000 - Figure 5-29 MCB Board

5-28 Operation
SG 2000 Installation and Operation Manual
Description Function
Alarm test point
(
ALRM TP) provides access for measuring the cross-over optical level
threshold.
3 dB test point
(3 dB
TP) is used to measure the optical power of the primary receiver.
Measurements at this test point are 3 dB less than the actual value.
Potentiometers ICS1
through ICS4
Control the attenuation of the ingress control switches (ICS) when they are
installed in the return paths of the RF output ports. The factory setting is for
minimum attenuation, however, they can be set for a maximum attenuation
of approximately 40 dB. The following list indicates the potentiometer and
its corresponding housing port:
ICS1 housing port IN RF chassis port 1
ICS2 housing port OUT RF chassis port 2
ICS3 housing port 1 RF chassis port 3
ICS4 housing port 3 RF chassis port 4
Figure 5-29 illustrates the MCB board, switches, potentiometers, and test points:
Figure 5-29
MCB board
ICS4
S2
S1
ICS3
ICS2
ICS1
A
LRM
3 dB TP
A
LRM TP