Appendix H. Ip Redundancy; Introduction; Crs-Xxx 1:1 Redundancy Switch Functional Description; 70/140 Mhz 1:1 Redundancy Switch - Comtech EF Data CDM-570 Installation And Operation Manual

Appendix H. IP REDUNDANCY

H.1

Introduction

All CDM-570/570L Satellite Modems can be configured for 1:1 IP Redundancy as a standard
feature when used with a Comtech EF Data CRS-180 (70/140 MHz IF) or CRS-170A (L-Band) 1:1
Redundancy Switch:
CDM-570 Modem Type
CDM-570 (70-140 MHz IF)
CDM-570L (L-Band)
This appendix describes CDM-570/570L IP 1:1 Redundancy configuration and operation using
either of these switches.
This equipment contains parts and assemblies sensitive to damage by
Electrostatic Discharge (ESD). Use ESD precautionary procedures when touching,
removing, or inserting Printed Circuit Boards (PCBs).
H.2

CRS-XXX 1:1 Redundancy Switch Functional Description

H.2.1 CRS-180 70/140 MHz 1:1 Redundancy Switch
See the CRS-180 70/140 MHz 1:1 Redundancy Switch Installation and Operation
Manual for more detailed information on the CRS-180 operation.
The CRS-180 70/140 MHz 1:1 Redundancy Switch performs the transmit and receive coaxial
switching required for redundant modem operation. It switches both the Tx and Rx coaxial cables
simultaneously.
Select Unit Faults only, Unit Faults or Receive Traffic Faults, or Unit Faults or Transmit
Traffic Faults, or all three for the switchover criteria with the two switches on top of the unit.
This selection provides a great deal of flexibility in the operation of the switch. Green LEDs on
the antenna side of the CRS-180 indicate which modem is online.
CRS Switch Model
CRS-180
CRS-170A
H–1