NV8500 family Digital Routers • User’s Guide 31
1. Introduction
Front Module Slots and Rear Connections
expansion connections, the bottom LC connector remains empty because only 9 signals are allowed
on the input backplane and the expansion backplane.
About Monitor Backplanes
Depending on the router frame, up to 4 monitor cards can be installed. Each monitor card produces
2 signals that can be sent to monitoring equipment for the purpose of assessing signal presence and
quality. There is a single type of monitor card; not different monitor cards for monitoring inputs or
outputs. Whether the card monitors inputs, outputs, or both depends on the type of router frame, the
slot into which it is installed on the frame, and the backplane associated with the card.
The monitor card must have a corresponding monitor backplane installed. (See Figure 1-22 on page
30.) The backplane contains connectors through which signals are sent from the “mated” monitor
card to monitoring equipment. For the NV8144 there is a single monitor backplane that monitors
both inputs and outputs. Backplane connectors are labeled ‘OUTPUT MON’ and ‘INPUT MON’.
For the NV8280 and NV8576 there is one monitor backplane for inputs and a separate monitor
backplane for outputs. The backplane connectors are labeled ‘IN 1’, ‘IN 2’, ‘OUT 1’ and ‘OUT 2’.
Two of the connectors connect cables to the monitoring equipment. The other two connectors are
used for “chaining together” multiple monitor cards or multiple routers.
The connectors labeled ‘IN’ on the backplane:
• Cross-connect monitor cards to other monitor cards, such as when two expandable frames
(NV8280-Plus or NV8576-Plus) are connected together, which enables the monitoring equip-
ment access to all inputs or outputs, or
• Connect to an ‘OUT’ connector when cross-connecting multiple monitor cards in the same
frame to each other. This only applies to NV8576 or NV8576-Plus.
The connectors labeled ‘OUT’ on the backplane:
• Connect to an ‘IN’ connector when cross-connecting monitor cards (as noted above), or
• Send signals for monitoring purposes to monitoring equipment.
The NV8280/NV8280-Plus and NV8576/NV8576-Plus router frames have separate monitor card
slots for monitoring inputs and outputs. The NV8280/NV8280-Plus router frame uses two cards:
one for inputs; one for outputs. The NV8576/NV8576-Plus router frame uses four cards: two for
inputs; two for outputs. The card slot determines the signals monitored: a monitor card in the input
monitor card slot monitors inputs; a monitor card in the output monitor card slot monitors outputs.
In the NV8280/NV8280-Plus, the input monitor card receives one signal from each input card.
Similarly, an output monitor card receives one signal from each output card. The NV8576/
NV8576-Plus monitor cards work exactly the same way except that the monitor cards in the upper
portion of the router frame receive signals only from the output cards and input cards located in the
upper region. Likewise, the monitor cards in the lower region of the frame receive signals only
from the input and output cards installed in the lower region of the frame.
To maximize efficiency, only one signal is sent from each input or output card to the monitor card
for forwarding to monitoring equipment. This means that only one signal from each input card or
output card is monitored at any give time.
Whether or not input and/or output monitor signals can be accessed and managed depends on the
application version currently loaded on the router’s control cards and if a Monitor Level has been
created using UniConfig. (See the UniConfig User’s Guide.)
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