Motorola BT100 ユーザーズマニュアル

2-12 

The ingress control switches (ICS) provide return-path signal attenuation or cutoff in the 

BT100. An ICS is required for each output port. Therefore the standard four output BT100 

requires four ICS’s. Switching is accomplished through the frequency agile LIFELINE 

status-monitoring transponder, which you can purchase directly from AM Networks.  
Figure 2-12 illustrates the LL-BTA-HMS and the required cable connections to the electronics 

chassis. 

 

The ICS provides a means of isolating sources of ingress from a centralized location. Using a 

downstream command through the LIFELINE status-monitoring system, you can attenuate the 

return path through the amplifier by 6 dB or by 38 dB. By reducing the ingress level at the 

headend or monitoring point, you can further isolate the ingress source. After you isolate an 

ingress source to the last possible amplifier, node, or line extender, you can shut the return path 

off at that location. This limits the impact of the ingress on the remainder of the network while 

eliminating the source of ingress.