NV5128 Multi-Format Router • User’s Guide 29
2. Introduction
Active Cards
Figure 2-22 shows the Classic SWB signal path for a single card set:
Figure 2-22. Classic SWB Video Signal Flow
Standard SWB
Similar to the Classic SWB card set, the Standard SWB card receives and distribute SWB signals
through 16 BNC connectors, housed on a backplane. The backplanes for SWB incoming signals
and outgoing signals are active and unique to video signals. (See Backplanes
on page 13.)
There are three types of Standard SWB cards: an input card, a main output card and expansion out-
put cards. Depending on how the cards are combined, different switching configurations can be
created. A single set of Standard SWB output cards can switch 128 inputs x 64 outputs. By install-
ing a second set of Standard SWB output cards, the configuration can be doubled 128 inputs x 128
outputs. For more information, see Switching Configurations
on page 8.
Input Cards
The Standard SWB input card (EM0466) receives 16 SWB signals through the active backplane
connectors. Equalizers on the backplane automatically compensate for length of cable. (See Techni-
cal Details on page 83.) The equalized signal is forwarded to the input card. The input card buffers
the equalized incoming signals from the backplane and forwards the signal to the motherboard.
Output Cards
There are two Standard SWB output cards: a main output card (EM0463) and an expansion output
card (EM0465). The main output card has a “wing” that extends into the three slots to the right of
the slot occupied by the main part of the card, using all four output slots on the side of the frame in
which it is installed. (See Figure 2-23 on page 30.) Connectors on the wing mate with up to three
optional expansion output cards, installed to the right of the main Standard SWB card.
The Standard SWB main output card receives all 128 available SWB sources from the mother-
board. Two 64 inputs x 64 outputs crosspoint arrays on the main output card can switch up to 128
inputs x 64 outputs. From the crosspoint, 16 outputs are re-clocked and sent to the main card’s cor-
responding active backplane through connections to the motherboard. The crosspoint forwards the
remaining 48 outputs to the wing connector, which feeds the signals to any installed expansion out-
put cards. When installed, the expansion output cards are connected to the wing connector, the
motherboard and associated backplanes.
I/O
Connectors
(up to 16)
Cable
Equalizers
on backplane
Cardset
XPT
32x16
I/O
Connectors
(up to 16)
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