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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), the user must also purchase a
redundancy kit tailored to that modem choice. This kit provides – in addition to the CRS‐180
70/140 MHz IF 1:1 Redundancy Switch module – all cables and components required for
interconnection of the redundant configuration to various interfaces (i.e., control, IF, and data),
excluding Ethernet, which requires user‐provided cables and Layer 2 switching.
The modem‐specific sections in this chapter identify the redundancy kit required for that
particular configuration. The individual redundancy kit item(s) required to assemble specific
interface examples are further identified.
•
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‐625 in a 1:1 system, the user is unable to establish an ASI interface
together with a G.703 Unbalanced interface, or an RS‐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.
•
The type of 1:1 Y‐Splitter cable required for modem‐to‐user interconnection
depends on the user's data interface. It is essential to ensure that the control
and IF connections, both Rx and Tx, are made correctly.
Chapter 4. CABLES AND
4–1
CONNECTIONS
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