Comtech EF Data CRS-200 REDUNDANCY SWITCH - Manual (Page 7)

CRS-200 COMTECH COMMUNICATIONS CORPORATION
CRS-200 REDUNDANCY SWITCH - OPERATIONS MANUAL PAGE 5
WARNING
Please note that the CRS-200 has been designed specifically as an
accessory product for the Comtech CDM-500, CDM-550 and
CDM-550T Modems,
and should not be used with any other manufacturer’s equipment.
3 CRS-200 OVERVIEW
The CRS-200 1:10 Redundancy Switch, for use with the CDM-500, CDM-550 and CDM-
550T Modems, provides fully automatic protection of traffic circuits in the case of equipment
failure, and is intended for hub applications.
If all Modems within a group are connected to the same up/downconverter, no external IF
switching is required. However, where operation with more than one up/downconverter is
required, the user may add the CRS-280 IF Switch, which permits connection to as many
converters as there are Traffic Modems.
The CRS-200 will support all of the interface types available on the modem, which includes
RS422/EIA530 DCE, V.35 DCE, X.21 DCE and DTE and RS232, sync and async. Note that,
unlike many other products of this type,
electrical interface types may be mixed within the
same redundancy group.
The CRS-200 incorporates the following key reliability features:
* The CRS-200 has twin, independent AC power supplies
* Normal traffic paths are maintained, error free, when AC power is removed
* A Traffic Modem Interface can be completely removed from the CRS-200, with its
cables still attached, and traffic will be not be interrupted
* Traffic Modem Interfaces (TMI) and the Redundant Modem Interface (RMI) can be
replaced without disturbing other traffic circuits
When operating with a single up/downconverter, the system comprises a maximum of 10
Traffic Modems, a Redundant Modem, and the CRS-200 Protection Switch. All IF inputs and
outputs are passively split and combined. The redundant modem is in remote control mode,