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5.1
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), you must also purchase a
redundancy kit tailored to that modem choice. Each kit provides the CRS-180 70/140 MHz IF 1:1
Redundancy Switch module, plus 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.
1) The cables required between each modem and Switch should be of shielded,
twisted-pair construction, with the grounded shield bonded to the back shell.
All data cables should be wired correctly using the pinout and connection
information as specified in Appendix A. CABLE DRAWINGS.
2) 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/A in a 1:1 system, you are unable to establish an ASI interface
together with a G.703 Unbalanced interface, or 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.
3) The type of 1:1 Y-Splitter cable required for modem-to-user interconnection
depends on your data interface. It is essential to ensure that the control and IF
connections, both Rx and Tx, are made correctly.
4) The Electronic Industries Association (EIA) designations supersede the
Recommended Standard (RS) designations. References to the old designations
may be shown when depicting actual text (e.g., RS-232) displayed on Switch or
the individual modem Web Server pages, serial remote interfaces, Telnet
Command Line Interfaces (CLIs), or unit rear panels. All other references in the
manual refer to EIA designations.
Chapter 5. CABLES
5–1
CONNECTIONS
AND
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