Grass Valley NV5128 v.2.5 - Manual (Page 38)

28 Rev 2.5 • 24 Sep 09
2. Introduction
Active Cards
Figure 2-21 shows the SD signal path.
Figure 2-21. SD Digital Video Signal Flow
Classic SWB
The Classic SWB input card set (EM0395) is composed of two cards and occupies two slots in the
router. The backplanes housing I/O connectors for receiving and distributing SWB signals are
active and unique to video signals. (See
Backplanes on page 13.) There are two types of back-
planes: one for inputs (EM0396) and one for outputs (EM0424).
There is a jumper that configures the Classic SWB card set for DVB/ASI operation. For more infor-
mation, see
Configuration on page 67.
A single Classic SWB card set can switch 16 inputs x 16 outputs. Two card sets can be linked
together such that the inputs from each card set is sent to the other card set, to create a switching
configuration of 32 inputs x 32 outputs. For more information, see
Switching Configurations on
page 8.
Up to 16 incoming signals are received through connectors on an associated I/O backplane. Equal-
izers on the backplane automatically compensate for length of cable. (See
Technical Details on
page 83.) The equalized signal is forwarded to the card set and a crosspoint array (32 inputs x 16
outputs) for switching. From the crosspoint, the SWB signal is forwarded to a re-clocker, which
automatically switches between 143, 177, 270, 360, and 540
Mb/s, and 1.483 and 1.485 Gb/s sample
rates. If the sample rate is non-standard, the re-clockers pass the signal to the backplane for distri-
bution without attempting to re-clock it. The signal is then sent to a cable driver on the backplane,
which forwards the signal to backplane I/O connectors for distribution.
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-
I/O
Connectors (up to 16) Motherboard
Input Card
Cable
Equalizers
on backplane
Rec’r
Output Card
XPT
128x16 I/O
Connectors (up to 16)
Re-
clocker
I/O
Connectors (up to 16)
Cable
Equalizers
on backplane
Cardset
XPT
32x16
I/O
Connectors (up to 16)