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2-6
Overview
Network Monitoring
The optional LIFELINE status monitoring system (LL-SG1) enables you to monitor the SG1000
from a headend or remote location. The LL-SG1 transponder is located in the lid, as illustrated
in Figure 2-4, and is connected to the electronics package (E-pack) with an umbilical cord.
The LIFELINE network monitoring system includes:
LL-CU control units
These units are connected to the system at the headend and interrogate each
SG1000 field transponder with FM outbound and inbound transmissions. You can
select a variety of outbound and inbound frequencies depending on the system
configuration. The control unit reports this information to the status-monitor
computer.
Status-monitor
Includes an IBM
computer and
through an RS-232 link. LIFELINE software enables you to view measurements
software
taken by the transponders.
LL-SG1-* field
Installed in individual SG1000 nodes, this unit interfaces with the LL-CU at the
transponders
headend. It reports such parameters as: forward amplifier dc current draw and gain
control voltage, ac supply voltage, optical power at receiver input and transmitter
output, +24 V supply voltage and current, forward-path RF output level, and
management and control of RF ingress switching and tamper status.
Ingress Control
Two ingress control switches (ICS) provide return-path signal attenuation in the SG1000.
Attenuation is accomplished using the LIFELINE status-monitoring transponder (LL-SG1)
located in the lid next to the power supply. The status monitor transponder controls the ICS
through digital control lines. Using a downstream command through the LIFELINE
status-monitoring system, the return paths can be attenuated through the SG1000 by 6 dB or
by 40 dB. By adjusting the ingress switch from the headend, you can isolate the ingress source.
After you isolate an ingress source to the last possible node, you can shut the return path off at
that location to limit the impact of the ingress on the remainder of the network.
Configuration
To accommodate unique system criteria, the SG1000 is shipped as a configured product.
Hundreds of variations are available with configurations designed to address varied system
requirements including:
Optional features include:
!
Fiber optic service cable
!
Surge protection
!
Chromate or epoxy housing finish
!
SC/APC or FC/APC optical connectors
!
Optical return transmitter
!
Ingress Switching
!
Network monitoring
SG1000 Split Third Port Installation and Operation Manual
®
-compatible computer that is connected to the control unit LL-CU
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