What Is Dual Link - Sony SRW-1 Operation Manual

What Is Dual Link?

For HD SDI signal input/output, the SRW-1 supports Dual
Link in addition to the normal Single Link.
The following lists the differences between Single Link
and Dual Link, and explains what you can do with HD SDI
signal input/output by them. Refer also to the table
showing the available HD SDI formats with Single Link
and Dual Link on the SRW-1.
Single Link
Single Link enables input and output of HD SDI signals
over a single BNC cable.
With Single Link, you can do the following format
selections.
• Handle basic 1080-line HD signals
The SRW-1 can handle 4:2:2 (Y/Cb/Cr)/1080/23.98PsF
to 29.97PsF (59.94i) HD signals. HD signals are input
from the HD SDI IN A connector. The HD SDI IN B
connector is not used. The HD SDI OUT A and HD SDI
OUT B connectors output the same signals. In power
saving mode, signals are output from the HD SDI OUT
A connector only. The number of pixels is 1920 × 1080.
• Handle 720P signals
In the 4:2:2 (Y/Cb/Cr)/720P format, you can handle the
number of frames by using the 59.94P and 50P
frequencies. When you do this, the number of pixels
decreases to 1280 × 720.
HD SDI formats supported by the SRW-1
Format
Frame rate
Effective frame size
HD SDI IN/OUT A
HD SDI IN/OUT B
SMPTE
PsF: Progressive Segmented Frames
i: Interlace
P: Progressive
118
What Is Dual Link?
Single Link
4:2:2 YCbCr
30/1.001 PsF
25 PsF
24 PsF
24/1.001 PsF
60/1.001 i
50 i
1920 × 1080
Y channel Y
C channel CbCr
Y channel
C channel
292M
Dual Link
Dual Link enables input and output of HD SDI signals over
two BNC cables.
With Dual Link, you can do the following.
• Handle different color spaces
Dual Link allows you to expand color difference signals
to RGB. The SRW-1 can handle 4:4:4(RGB)/1080/
23.98PsF to 29.97PsF(59.94i) HD signals.
When you do this, all of the G component and half of the
B and R components are input and output via the HD
SDI IN/OUT A connector. The other half is input and
output via the HD SDI IN/OUT B connector.
HD SDI IN/OUT A = G / 0.5
HD SDI IN/OUT B = None / 0.5
• Increase the number of channels
Dual Link allows you to record and play back two 4:2:2
Single Link channels as DUAL STREAM on a single
tape.
HD SDI IN/OUT A = Channel 1
HD SDI IN/OUT B = Channel 2
However, multiplexed audio and timecode is recorded
by HD SDI IN A only.
• Increase the number of frames
Dual Link allows you to double the number of frames to
4:2:2 60P.
HD SDI IN/OUT A = Even lines / Odd lines
(alternating on each frame)
HD SDI IN/OUT B = Odd lines / Even lines
(alternating on each frame)
Note
In the SMPTE 372M 4:2:2 60P standard, the active lines of
digital field 2 are different between Link A and Link B
(Link A: line 584 to 1123, Link B: line 583 to 1122).
Dual Link
4:2:2 YCbCr 720P 4:4:4 RGB
60/1.001 P 30/1.001 PsF
50 P 25 PsF
24 PsF
24/1.001 PsF
60/1.001 i
50 i
1280 × 720 1920 × 1080
Y G
CbCr 0.5B/0.5R
–
0.5B'/0.5R'
296M 372M
× ×
B' / 0.5 R'
× ×
B" / 0.5 R"
4:2:2 YCbCr 60P
60/1.001 P
50 P
1920 × 1080
Y
CbCr
Y
CbCr
372M