Motorola SG 2000 operation manual Ingress Control, State Description, Off

O p e r a t i o n 5 - 2 9

Ingress Control

The SG 2000 platform incorporates electronic ingress control switching enabling operators to choose one of three options for troubleshooting noise sources. A maximum of four switches, (one ingress switch per RF port) can populate the RF amplifier. Figure 3-2 illustrates their location on the RF chassis.

Ingress switches are controlled in one of two ways: (1) remotely — through the optional on-board LL-SG2 transponder in communication with the status monitoring system or; (2) locally — using the manual control board (MCB).

The three states of the switch and their functions include:

State	Description
Off	Effectively isolates the contaminated leg by adding a minimum of 40 dB attenuation.
–6 dB	Typically initiated at the headend, it provides –6 dB additional attenuation to the return
	signal. This is useful in diagnosing noise presence without interfering with normal
	service.
On	Completes the return path without alteration to the return signal.

SG 2000 Installation and O peration Manual