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4.1
Overview
When assembling a Comtech EF Data 1:1 Redundancy System, in addition to purchasing the
desired modem pair (one Redundant modem, one Traffic modem) and the CRS-150 1:1
Redundancy Switch, the user is also required to purchase all cables and components required for
interconnection of the redundant configuration to various interfaces (i.e., control, IF, and data).
The sections that follow in this chapter provide specific interface examples that identify the
individual redundancy kit item(s) required to assemble that interface.
1. It is physically impossible to connect all available data interface solutions
within a single 1:1 redundancy system at a given time. For example, when
using the CDM-600 in a 1:1 system, the user is unable to establish an
EIA-422/232 interface together with an HSSI interface. Therefore, the
quantities of cables and accessories furnished with each redundancy kit have
been predetermined with this operational limitation taken into consideration.
2. It is essential to ensure that the data and IF connections, both Rx and Tx, are
made correctly. For example, the Transmit IF from Unit 'A' connects to the Tx
IF port 'A' on the CRS-150, and Unit 'B' to 'B', and the same for the Rx IF
connections. Failure to observe this requirement will result in the system
malfunctioning.
Chapter 4. CABLES AND
4–1
CONNECTIONS
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