Figure 4-1. Control Cabling Of A 1:1 System - Comtech EF Data KPA080 Installation And Operation Manual

Redundant Configuration
The position of the waveguide/coax switch also is automatically changed to route the
signal through the backup unit, thereby minimizing the loss of traffic.
Control cable assemblies are required to set up either a 1:1 or a 1:2 system (other RF
coaxial cables and waveguides are required as shown in Figure 2-1).
Figure 4-1 shows the control cabling for a 1:1 system. The redundant loop cable
connecting the two SSPAs together provides a number of functions.
The backup SSPA communicates to the primary SSPA via a serial interface also provided
by this redundant loop cable assembly. This interface is used by the Backup SSPA to
acquire configuration information from SSPA #1. In addition, this interface provides the
link for virtual addressing as described in Section 5 of this manual.
Summary fault relay contacts also are included in this cable assembly and are used by the
backup SSPA as an input to its switching logic. The second cable assembly is a
six-wire assembly between the backup SSPA and the Waveguide Switch Assembly.
Figure 4-2 shows the cabling for a 1:2 system. Note that the functionality describes for
the 1:1 cable assembly is directly applicable for the 1:2 cable assembly. The only
difference is that there is now a third connector daisy-chained onto the cable assembly.
This connector is labeled SSPA #2. When connected to a Comtech EFData SSPA, the
SSPA will automatically configure itself as Primary SSPA #2.
The second control cable attaches from the Backup Unit J7 to the Waveguide switch.
4-2

Figure 4-1. Control Cabling of a 1:1 System

•
This cable assembly is not a straight through cable.
•
The cable assembly is labeled "backup" on one end, and SSPA #1 on the
other end.
•
The cable assembly is wired so that when connected to two SSPAs, one
SSPA will automatically configure itself as the Backup Controller and the
other SSPA will automatically configure itself as the 'Primary SSPA'.
KPA080 Ku-Band Solid-State Power Amplifier
Rev. 0