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CRS-170 1:1 Redundancy Switch
Installation and Operations Manual
The CDM-600L and SDM-300L3 modems do not have built in switching capability for
the terrestrial data side of the link. One-for-one redundancy for the CDM-600L requires
both a CRS-150 switch to act as controller and terrestrial data switch, and a CRS-170 to
perform the RF side switching.
The CRS-170 is required because the CRS-150 RF switching is limited to the 70/140
MHz band, and will not handle the high current BUC power supply multiplexed onto the
transmit coaxial cable. Similarly, the SDM-300L3 requires an SMS-301 switch together
with the CRS-170.
In both cases, the CRS-170 is controlled by the supporting data switch, and places the
"A" or "B" modem RF on-line to match the data switch state. The CDM-600L modems
supply redundant power to the CRS-170 through the CRS-150. The SMS-301 itself has
redundant power supplies, and feeds power to the CRS-170 through the control cable.
Online-standby modem configuration matching is provided by the CRS-150 controller
communication with the CDM-600L modem. The SMS-301 does not automatically
configure the standby modem.
The CRS-150 is an accessory product designed specifically for the Comtech EF
Data CDM-600 and CDM-600L modems, and must not be used with any other
equipment.
WARNING
The SMS-301 is configured differently for use with the SDM-300L3 than for
use with the SDM-300A. The configuration must be done at the factory and
must be specified at the time of order.
IMPORTANT
For correct operation of the CRS-170, the CDM-600L modems must have
installed:
If the modem does not meet this requirement, please contact the factory.
Flash firmware upgrades are free, and may be downloaded from the CEFD
web page. Hardware revision upgrades must be performed at the factory.
Firmware Version 1.1.4 (or higher)
Hardware Revision 3
16
Revision 1
MN/CRS170.IOM
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