Miranda NV8144 User Manual

NV8500 family Digital Routers • User’s Guide 43
1. Introduction
Active Cards
The ‘expansion’ cards on the local router and the ‘expansion’ cards on the connected router “mir-
ror” each other, performing identical tasks. To illustrate, the ‘expansion’ output cards receive and
distribute signals as follows, where card 1 belongs to the local router and card 2 belongs to the con-
nected router:
• Card 1 receives 9 signals from the local crosspoint cards (one copy of the local input). It sends
these signals to both the output monitor cards and to local I/O connectors as outgoing signals.
• Card 1 also sends 9 additional local signals to the expansion connectors and on to card 2.
• Card 1 receives 9 signals from card 2 through the expansion connectors.
• At the same time, card 2 performs the exact same tasks card 1 is performing.
Figure 1-36 shows the flow of a signal through the ‘expansion’ output card:
Figure 1-36. ‘Expansion’ Output Block Diagram (Coax Cards)
‘Filler’ Output Cards
The NV8576-Plus and NV8280-Plus use ‘filler’ output cards to allow expansion of the router’s
input space when expansion of the output space is not required. If the output space is later
expanded, ‘filler’ output cards can be replaced with ‘expansion’ output cards. ‘Expansion’ and
‘filler’ cards can be inter-mixed in a single frame as needed.
When two routers are connected, the ‘filler’ cards on the local router forward 9 signals to a cable
driver. The cable driver feeds the outputs to one of two expansion connectors for distribution to a
second, connected router. The other expansion connector holds the cable in place for the eventual
replacement of the ‘filler’ card with a ‘expansion’ card.
Figure 1-37 shows the flow of a signal through the ‘filler’ output card:
Figure 1-37. ‘Filler’ Output Block Diagram
Motherboard
Reclocker
Cable
Driver
Outgoing
Signal
9 9 9
9:1 MUX
Monitor
9
Local
Crosspoint
Card
9
2:1 MUX
Cable
Receiver
Expansion
Signals
9
Exp.
Cable
Conn.
9
9
Cable
Driver
9
9 9
Note Cable drivers are not present on output cards managing fiber optic signals.
Motherboard
Local
Crosspoint
Card
9
Expansion
Signals
9
Cable
Driver
9

Miranda NV8144 Specifications

General

Brand	Miranda
Model	NV8144
Category	Switch
Language	English