42 Rev 2.2 • 27 Mar 10
1. Introduction
Active Cards
copy to a 18×1 MUX. The cable driver forwards the signal to a connector (DIN 1.0/2.3, terminal
block or fiber optic) to distribute the outgoing signal. The 18×1 MUX sends the output to the moth-
erboard, which in turn forwards the signal to output monitor cards.
Figure 1-35 shows the flow of a signal through the ‘Standalone’ output card. For signal re-clocking
rates, see Signal Rates and Flow
on page 4.
Figure 1-35. ‘Standalone’ Output Block Diagram (Coax Cards)
‘Expansion’ Output Cards
‘Expansion’ output cards (also called “plus” output cards) are used with the NV8500 family
expandable frames (NV8280-Plus and NV8576-Plus). Each ‘expansion’ card receives 18 signals
from the local crosspoint cards (via the motherboard). 9 of these signals feed a 2x1 MUX.
The ‘expansion’ card forwards 9 additional signals to cable drivers. The cable drivers feed the out-
puts to an expansion connector for distribution to a second connected router. At the same time, the
second router sends 9 signals to the first router through a second expansion connector. Signals
arriving through these expansion connectors are forwarded, through a cable receiver, to the 2x1
MUX mentioned above.
The 2x1 MUX feeds the signal to one of 9 reclockers. The reclocker creates two copies of the input,
feeding one copy to a cable driver and one copy to a 9x1 MUX. The cable driver forwards the out-
put to a DIN 1.0/2.3 (coax), terminal block, or LC connector to distribute the outgoing signal. The
MUX sends the output to the motherboard, which in turns forwards the signal to the output monitor
cards.
Note Cable drivers are not present on output cards managing fiber optic signals.
Crosspoint
Card
18
Motherboard Reclocker
Cable
Driver
Outgoing
Signal
18 18 18
18:1 MUX
Monitor
18
Note Cable drivers are not present on output cards managing fiber optic signals.
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