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201627 REV X
4 RU SSPA Chassis Operations Manual
5.5 Link Cable
The 9-pin male connector J8 Link Port is used to link an HPA with the other two
redundant units in order to pass online/standby status information between them. The
link cable is an asymmetrical crossover cable. Take care to match the labels on each
cable with the HPA status of the units (i.e., plug cable end with label “HPA1” into the
SSPA with selected “HPA1” status, etc).
Warning! Do not remove this cable while the system is in operation! The system
will not operate properly
.
Table 5-2
shows the pin-outs of J8.
Figure 5-3
shows an outline drawing of a typical
link cable.
Figure 5-4
shows a representation of how switch and link cables are
connected between the SSPAs and the waveguide switches.
HPA1 J8 Link Port
HPA2 J8 Link Port
HPA3 J8 Link Port
Pin #
Description
Pin #
Description
Pin #
Description
7
Link Out to HPA3
-
-
8
Link In from HPA1
-
-
6
Link Out to HPA3
9
Link In from HPA2
6
Link Out to HPA2
8
Link In from HPA1
-
-
8
Link In from HPA2
7
Link Out to HPA1
-
-
-
-
9
Link In from HPA3
6
Link Out to HPA2
9
Link In from HPA3
-
-
7
Link Out to HPA1
Table 5-2: Link Cable Wiring
Figure 5-3: Outline Drawing, Link Port Cable
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