Table 1-1. If Switch Compatibility Table - Comtech EF Data CRS-280L Installation And Operation Manual

70/140 mhz if switch for 1:n redundancy, l-band if switch for 1:n redundancy

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Table Of Contents

Table of Contents

The CRS-280 (70/140 MHz) IF Switch (Figure 1-1) provides complete isolation of the IF signals.

The Redundant Modem's IF signals are routed to the Traffic Modem's IF path when the Switch

RMI is online. The Switch automatically senses the presence of the CRS-280. The Switch, upon

switching, leaves the offline modem with its IF on, and the CRS-280's relays isolate any

undesired signals.

The CRS-280 (70/140 MHz) IF Switch is necessary when one or more modems within the

redundancy system connect to more than one up/down converter. This occurs when the modems

connect to more than one transponder on the same antenna polarization, or when modem

redundancy needs to span two or more polarizations or antennas.

The CRS-280L (L-Band) IF Switch (Figure 1-2) is designed to support redundancy systems

featuring one Redundant (backup) Modem and up to 10 Traffic Modems (prime channels).

Operation of the CRS-280L is controlled by the switching system to which it is connected.

The CRS-280L (L-Band) Switch is necessary when one or more modems within the redundancy

system connect to the other polarization of the antenna or to multiple antennas.

The CRS-280/280L is designed for use with the following Comtech EF Data products:

Modem

CDM-570L/570AL

CDM-600L

CLM-9600L

CDM-600/600L

CDM-625/625A

CDM-700

CDM-710

CDM-710G/710GL

CDM-Qx/QxL

SLM-5650/5650A

SDM-300L3**

SDM-2020D**

(L-Band)

** Indicates a Comtech EF Data legacy product that is no longer in production

The CRS-280 replaces the following Comtech EF Data active or legacy products:

•

CRS-282 IF switch for 70/140 MHz applications

The CRS-280L replaces the following Comtech EF Data active or legacy products:

•

IFU for SMS-7000 L-Band applications.

•

CRS-282 IF switch for L-Band applications (CRS 300/CRS 500)

Introduction