NV5128 Multi-Format Router • User’s Guide
31
2. Introduction
Active Cards
Figure 2-24 shows the signal path for analog video signals:
Figure 2-24. Analog Video Signal Flow
Analog Video Converter
The Analog Video Converter (AVC) input card and output card add versatility to the NV5128
Multi-Format Router by converting signals, as follows:
• The AVC input card converts incoming composite analog video signals (NTSC or PAL) to SD,
serially-interfaced signals.
• The AVC output card accepts SD inputs from the motherboard and outputs them as analog com-
posite signals in NTSC or PAL format.
An AVC input card can be paired with an AVC output card, SD output card or SWB output card.
An AVC output card can be paired with an AVC input card, SD input card or SWB input card. Any
video I/O card paired with an AVC input card or AVC output card must be able to manage a signal
rate of 270
Mb/s.
Converting a signal from analog to SD delays the signal by approximately 1-1/4 lines; frame syn-
chronization and sub-carrier phase alignment are not maintained with respect to reference. AVC
input cards and output cards provide an economical way to convert NTSC/PAL inputs where signal
timing is not critical; there is a processing delay of approximately 4 pixels when using an AVC out-
put card. With AVC output cards, frame synchronization and sub-carrier phase alignment are not
maintained with respect to reference. This timing is not adjustable.
Incoming and outgoing analog video signals are received or distributed through 16 BNC connec-
tors housed on a backplane. (See
AVC Input Card
The AVC input card (
EM0432
) receives up to 16 composite analog video signals through backplane
I/O connectors. Each incoming signal is received by a differential input amplifier. The amplifiers
create single-ended outputs. The outputs are forwarded to anti-aliasing filters and then onward for
processing by an NTSC decoder (AVC) synchronized to 27
.
MHz. The converter feeds the signal to
a SMPTE 259M formatter and bus driver. A 27
MHz phase-locked loop (PLL), locked to the video
converter, reduces jitter during the data formatting process. The SD output is line-locked to the
I/O
Connectors (up to 16)
Motherboard
Input Card
Output Card
XPT
32x16
I/O
Connectors (up to 16)
MUX
4x1
XPT
32x16
XPT
32x16
XPT
32x16
Summary of Contents for NV5128
Page 1: ...User s Guide NV5128 Multi Format Router...
Page 44: ...34 Rev 2 3 14 Oct 08 2 Introduction Active Cards...
Page 92: ...82 Rev 2 3 14 Oct 08 6 Maintenance Obtaining Service...
Page 102: ...92 Rev 2 3 14 Oct 08 8 Glossary Glossary...
Page 106: ...96 Rev 2 3 14 Oct 08 A Part Numbers Power Supplies...
Page 114: ...104 Rev 2 3 14 Oct 08 Index...
