Motorola SG 2000 Alarm test point, DB test point, Potentiometers ICS1, Through ICS4, MCB board

5 - 2 8 O p e r a t i o n

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	Control the attenuation of the ingress control switches (ICS) when they are
through ICS4	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 ICS2 ALRM

ICS3 ICS1

S2	3 dB TP
	ALRM TP

S1

SG 2000 Installation and O peration Manual