Product specifications

4–1
Chapter 4. CABLES AND
CONNECTIONS
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 is also required to
purchase a redundancy kit tailored to that specific modem choice. This kit includes not only the
CRS-170A L-Band 1:1 Redundancy Switch module, but nearly all cables and components
required for interconnection of the redundant configuration to various interfaces (e.g., control,
data, IF, etc.).
The modem-specific sections that follow in this chapter specify the redundancy kit required for that
particular configuration. These sections additionally provide specific interface examples that
identify the individual redundancy kit item(s) required to assemble that interface.
IMPORTA TN
1. It is physically impossible to connect all available 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.
2. 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.