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CRS-170A L-Band 1:1 Redundancy Switch
Introduction
Revision 3
MN/CRS170A.IOM
Figure 1-5. 1:1 Redundancy Switchover
All configuration changes can only be made to the Online Modem and
will require the User TO “SAVE Parameters to permanent storage” TO
ENSURE THE configuration change is also applied to the Backup Modem.
1.2.2 Operation with CDM-600L (CLM-9600L) and SDM-300L3
Operation with two CDM-600L (CLM-9600L) modems requires an additional CRS-150 1:1
switch for terrestrial data switching and 1:1 control, while operation with two SDM-300L3
modems requires an additional SMS-301 1:1 switch to handle terrestrial data and control. Thus,
there are three functional configurations for the CRS-170A.
1.2.3 Operation with CDM-600L (CLM-9600L) and CRS-150
The CRS-150 connects to two modems (an online unit and a standby unit), monitors the fault
status of these two units, and controls the routing of data to and from the two units. IF signals,
10MHz reference signals, DC power for the BUC and LNB, and FSK signaling to the BUC are
switched in the CRS-170A under control of the CRS-150. In the case of an equipment failure,
automatic switching takes place to protect the traffic circuit.
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