NV8500 family Digital Routers • User’s Guide 65
2. Installation
Making Signal Connections
The connections that allow two expandable router frames to send signals between the frames are
located on output backplanes. Expansion (output) backplanes have either 9 coax connectors or 9
LC connectors for local signals and 2 high-density 28-pin connectors for expansion signals.
LC expansion backplanes contain 5 modules of two LC connectors each for a total of 10 possible
connections. Do not connect to all 10. Only 9 of the connectors are used.
The two expansion connectors on each backplane are labeled ‘INPUT’ and ‘OUTPUT’. You con-
nect the ‘INPUT’ of a backplane on one router to the ‘OUTPUT’ of the same backplane on the
other router
— in the same location, upper or lower. For example, you connect the ‘INPUT’ at slot
12 on router 1 to the ‘OUTPUT’ at slot 12 on router 2. Similarly, you connect ‘OUTPUT’ at slot 12
on router 1 to the ‘INPUT’ at slot 12 on router 2.
Connections for outputs (the non-expansion connectors on the expansion backplane) are connected
to devices as described in How to Make Local I/O Connections
on page 60. Each output connector
on the backplane has a unique signal number assigned. Signal numbers are assigned to each con-
nector based on two factors: 1) where individual connectors are located on the backplane, and 2)
where in the router frame the backplane is installed. Before making signal connections, it is impor-
tant to review how signal numbers are associated with individual connectors on the backplanes. For
detailed information and a guide to backplane connectors and related signal numbers, see Back-
plane Connectors and Individual Signal Numbers on page 14.
How to Make I/O Expansion Connections Between Two NV8280-Plus Routers
1 Facing the rear of the first router (Router 1), locate the expansion connectors. There are two
28-pin connectors situated slightly apart from the output signal connectors on the I/O back-
plane. For each expansion connector, connect using Miranda’s expansion connector/cable
(WC0121).
2 Locate the output connectors on the expansion backplanes.
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