The Serial Digital Interface (SDI) is a digital video interface standard developed by the SMPTE organization.For example, the ITU-R, the BT.656, SMPTE. 259M defines a digital video interface for broadcast level; a famous HD serial digital interface standard (HD-SDI) that provides a data rate of 1.485 Gbit/s. A double-link HD-SDI standard is defined in the SMPTE 372M , the interface consists of a pair of SMPTE 292M links, capable of providing a 2.970 Gbit/s data transfer rate.The interface widely used in digital cinema or HDTV HDTV 1080P, it can have better fidelity and resolution than conventional HDTV. In the recent years, the interface 3G-SDI consisting of a single 2.970 Gbit/s serial link is defined in SMPTE 424M, which will replace the double-link HD-SDI.
These standards are used to transmit uncompressed, unencrypted digital video signals in broadcast television devices, which may also be added as necessary embedded audio and time code.Coaxial cable transmission, the distance is generally less than 300m.The fiber specification as defined by the SMPTE 297M can be long-distance transmission is limited to the maximum fiber length or repeater.Usually, SDI and HD-SDI are applied to professional vision only .In frequency devices, various license agreements limit unencrypted digital interfaces, banning them from using consumer devices such as Blu-Ray and individuals use in video CR.
SDI Standard List (colored as supported)
Standard |
Name |
Bit rate |
Video format example |
SMPTE 259M |
SD-SDI |
270 Mbit/s, 360 Mbit/s, 143 Mbit/s, and 177 Mbit/s |
480i, 576i |
MPTE 344M |
ED-SDI |
540 Mbit/s |
480p, 576p |
SMPTE 292M |
HD-SDI |
1.485 Gbit/s, and 1.485/1.001 Gbit/s |
720p, 1080i |
SMPTE 372M |
Dual Link HD-SDI |
2.970 Gbit/s, and 2.970/1.001 Gbit/s |
1080p |
SMPTE 424M |
3G-SDI |
2.970 Gbit/s, and 2.970/1.001 Gbit/s |
1080p |
TBA |
6G UHD-SDI |
6 Gbit/s |
4K30Hz |
TBA |
12G UHD-SDI |
12Gbit/s |
4K60Hz |
Advantages
It is a no compression, no delay of radio and television level optical terminal machine, pure hardware architecture, strong stability, high compatibility, anti-interference, support for pathological code module use;
It is highly flexible, on the basis of it can be based on different application scenarios, add video, independent audio, data, ethernet, telephone, contact closure and other functions.Plug and plug type board card design, can be mounted on a 2U chassis, convenient user unified management, maintenance;
It standard transmission distance can be up to 20KM, optical module single multi-mode compatibility, plug and plug optical module design, can be used according to the actual needs of the site can replace the optical module, it is simple to operate, plug and play, without debugging;
It is widely used in long-distance radio and television, medical surgery system, high-quality video and audio transmission system, remote multimedia teaching, video conference system, urban intelligent traffic monitoring system (ITS), safe city, military communication, military monitoring;
Specifications
Fiber index |
Wavelength |
1270/1330nm |
Rate |
3G bps |
Tx power |
>-6db |
Rx sensitivity |
>-14db |
Fiber connector |
LC |
Video index |
Signal type |
DVB -ASI、SD-SDI、 HD-SDI、 3G-SDI |
Work standards |
DVB-ASI 、SMPTE259M-C、SMPTE292M、SMPTE424M |
Bit rates |
270 Mbps、 1. 485 Gbps、 2. 97Gbps |
Video input / output |
Signal type |
1 single-link DVB-ASI, SD-SDI, HD-SDI, 3G-SDI digital video with local loop out |
Input impedance |
75 Ohm |
Enter the automatic cable equalization |
>80m (1. 485 Gbps@BELDEN8281 cable) |
Clock recovery |
When 270 Mbps, 1. 485 Gbps, and 2. 97Gbps are automatic, the others are bypass |
Input level |
800mVp-p±10% |
Enter the echo loss |
>10dB @ 2. 97 Gbps |
Output DC offset |
<±0. 5V |
Output echo loss |
>10dB @ 2. 97 Gbps |
The biggest shake |
<0. 1UI(1485Mbps) |
Signal overshoot |
<5% (1485Mbps) |
Data index |
Transmission direction |
1-channel reverse transmission |
Work pattern |
Half-duplex mode |
Level type |
RS485 (2-wire system) |
Bit error rate |
<10^-9 |
Rate |
0-400Kbps |
Physical interface |
Phoenix terminal |
Equipment information |
The shell metal |
Aluminium alloy |
Way to install |
Wall-mounted / card type |
Product size |
104*108*28mm |
Product net weight (unit: pair) |
0.45KG |
Product weight (including the outer packaging) |
0.75KG |
Packing size |
275*219*54mm |
Input voltage |
100VAC~242VAC, 50-60Hz |
Power supply |
DC 5V |
Power dissipation |
<1.5W |
Overload protection |
provide |
Over current protection |
provide |
Other indexes |
Operating temperature |
-20°C ~75°C |
Storage temperature |
-40°C ~85°C |
Relative humidity |
From 5 to 95% (non-condensing) |
Working life |
> 100,000 hours |
Connection Diagram

The connection diagram is for reference only
Product Types
S/no |
Product Configuration |
Size |
Power Supply |
Remarks |
1 |
2 channel forward 3GSDI video |
192*167*28mm |
DC 5V |
Can increase the loop out, RS485 data function |
2 |
4 channel forward 3GSDI video |
192*167*45mm |
DC 5V |
Can increase the loop out, RS485 data function |
3 |
8 channel forward 3GSDI video |
445*220*45mm |
A C100-240V |
Can increase the loop out, RS485 data function |
4 |
16 channel forward 3GSDI video |
445*220*45mm |
A C100-240V |
Can increase the loop out, RS485 data function |
5 |
1 channel bidirectional 3GSDI video |
192*167*28mm |
DC 5V |
Can increase the loop out, RS485 data function |
6 |
2 channel bidirectional 3GSDI video |
192*167*45mm |
DC 5V |
Can increase the loop out, RS485 data function |
7 |
4 channel bidirectional 3GSDI video |
445*220*45mm |
A C100-240V |
Can increase the loop out, RS485 data function |
8 |
8 channel bidirectional 3GSDI video |
445*220*45mm |
A C100-240V |
Can increase the loop out, RS485 data function |