Video(영상) 전송 광통신 모듈이란
Video
transceiver modules?
It
can be divided traditionally by operating rate into HD-SDI, 3G-SDI,
6G-SDI, 12G-SDI; by transmission mode into single Tx, single Rx, dual Tx, dual
Rx and TR transceivers; by standards into MSA and non-MSA; by operating
wavelength into 1310nm, 1490nm, 1550nm and CWDM wave length. It also exists
video modules of electrical interfaces that adapting mini BNC port to coordinate
with SFP slot-supporting digital matrix. Currently there are also on the market
some crossover video transceivers, for example, transfer the encoded SG-SDI to
IP protocol conversion module can be used in traditional Ethernet switch,
replacing video codec equipment.
3.
What are the data rate of digital SDI?
Standards |
Names |
Pubdata |
Data
Rate |
Digital
Video Format |
SMPTE
259M |
SD-SDI |
1989 |
270 Mbit/s,
360 Mbit/s, 143 Mbit/s, and177 Mbit/s |
480i,
576i |
SMPTE
344M |
ED-SDI |
|
540 Mbit/s |
480p,
576p |
SMPTE
292M |
HD-SDI |
1998 |
1.485 Gbit/s,
and 1.485/1.001 Gbit/s |
720p,
1080i |
SMPTE
372M |
Dual
Link HD-SDI |
2002 |
2.970 Gbit/s,
and 2.970/1.001 Gbit/s |
1080p60 |
SMPTE
424M |
3G-SDI |
2006 |
2.970 Gbit/s,
and 2.970/1.001 Gbit/s |
1080p60 |
SMPTE
ST-2081 |
6G-SDI |
2015 |
6 Gbit/s |
2160p30 |
SMPTE
ST-2082 |
12G-SDI |
2015 |
12 Gbit/s |
2160p60 |
5.
What are 6G-SDI and 12G-SDI applied in?
Generally
in HD digital broadcasting field, such as digital output port of TV station HD
professional camera. One-channel 6G-SDI can transmit 36fps 4K resolution
zero-compressed video, while one-channel 12G-SDI can transmit 60fps 4K
resolution zero-compressed video.
6.
What are the main differences between HDMI and SDI?
a. Different
transmit mode: Adapting parallel mode, HDMI cables contain up to 19 pairs of
wires; while SDI adapts serial mode and contains only one pair of
wire.
b. HDMI
is applied for consumer products, like DVO from consumer camera, game machine
and HD digital Set Top Box; when SDI applied in broadcast market, like TV
stations and studio.
c. HDMI
interface supports HDCP encryption HD digital copyright protection, but not
SDI.
7.
What is SDI digital video matrix? What main functions it has?
Digital
video matrix arbitrarily exports m channel video
signal to the electronic device on n channel monitor equipment by
switching array method, realizes video switch function through digital
Cross-point chip, which realized by artificially plugging the copper shaft joint
of distribution frame before the digital video matrix appearance. Presently
digital matrix has been distinguished by working bandwidth, such as the type
supporting 3G-SDI high-speed signal; usually each input-output port supports
automatic equilibrium function; and high-end model has CDR clock regeneration
function, on port types it has BNC copper shaft joint, also video SFP
supportable fiber interface. With module design, it is more flexible to deploy
and convenient to use.
8.
What long-distance transmission solutions applying 3G-SDI, 6G-SDI and
12G-SDI?
3G-SDI,
6G-SDI and 12G-SDI both are digital baseband signal, thus limited with
long-distance transmission on copper cable, for instance, 3G-SDI signal can
transmit up to 55 meters on premium copper cables, but that will be much
decreased to within 10 meters as for 6G-SDI and 12G-SDI, what’s more, copper
cable transmission is susceptible to outside electromagnetic interference. If
high-speed baseband signal proceeds optics and electrics conversion, then it can
be greatly solved through optic-fiber cables. Currently the generic 3G-SDI video
transceivers in marketplace is with transmission distance up to 40km on
singlemode optical cables, and it will be easily to solve long-distance
transport with 3G-SDI transmitter. Meanwhile there are many optical module
options supporting CWDM waveband, which save much fiber resource by carrying
WDM(wavelength division multiplexing) on single fiber. Now 6G-SDI and 12G-SDI
optical transceivers gradually are commercially available.
9.
What’s the difference between MSA and Non-MSA standards of 3G-Video SFP optical
transceiver modules? What will be the consequence if they match wrongly to host
machine?
The
gold finger of 3G-Video SFP transceivers have 20 pins, MSA ans Non-MSA differ in
I2C pin definition:
MSA
standard defines I2C definition on the fourth pin (SDA) and the fifth pin (SCL);
while Non-MSA standard defines it on the fifth (SDA)and sixths (SCL)pins.
I2C
pins failing to match the host machine can directly lead to SFP module
communication connecting error to host machine I2C, it comes out the SFP DDM
function is unavailable and EEPROM unreadable by host machine.
HD-SDI 비디오 광모듈 보러가기:
https://exatek.co.kr/category/hd-sdi-%EB%B9%84%EB%94%94%EC%98%A4-%EA%B4%91%EB%AA%A8%EB%93%88/102/
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