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AST204 3G-SDI Fiber Transmission

Ascent’s AST200 series supports 4-channel HD/3G-SDI standard high-definition video signal and RS485 and Tally signal transmitted via single fiber optical cable. The 3G-SDI Video over Fiber Converters includes one transmitter and one receiver for 1080P 3G-SDI signal. The 3G-SDI Fiber Converters can transmit 4-Ch 3G-SDI Video signal through a single optical fiber, and it support Loop output, 4Ch Tally and backwards RS485. The video quality is non-compressed broadcast level. It’s widely used in broadcast field. The system comes with standard configuration Fiber Optic Transmitter and Receivers for Serial Digital signals up to 3G-SDI running at 3.0 Gbps. The customized option can also be ordered with any standard CWDM optics channel, longer distance and internal passives are available by request. No configuration or management is needed, as the system automatically adjusts to any input signal type regardless of bit rate or protocol. Easy to connect RS485 and Tally port allows for Signal Detect for all channels. Units come standard with FC/UPC fiber connectors and can be mounted on the wall or rack. Simplified easy to use plug and play saves deployment time and less maintenance required.

·       4 channel 3G/HD-SDI video transmission over optic fiber

·       Automatic cable equalization to ensure signal integrity

·       Automatic reclocking 270Mbit/s - 1.48Gbit/s-3Gbit/s

·       Directly compatible with 3G/HD-SDI camera systems and support 4Ch Loop output

·       Long transmission up to 20 km (12.5miles) (Other distance Optional)

·       Supports 4Ch Tally

·       Full digital non-compression broadcast level transmission

·       Support 1Ch backward RS485 and 4Ch Tally

·       Working temperature range (-10°C to +55°C)


Technique parameters

SDI Input

SMPTE 424M, SMPTE 292M, SMPTE 259M, DVB-ASI, DVB-SSI and Telecom/Datacom

270Mbit/s - 1.48Gbit/s – 3Gbit/s

Input Number: 4

Reflection Loss: >15dB

Equilibrium: 0-150m @3Gb/s

Connector: BNC




Channel: 1

Type: Single-mode

Transmission Distance: 20km (Other distance optional)

Reflection Loss: > 15dB

Dithering: < 0.2UI

Connector: FC/UPC (SC, LC, ST optional)




SDI Output

Output Number:4

Signal Level: 800mV nominal

-40 °C to +85 °C

Rise/Fall Time: 200ps indication

Overshoot: < 10% amplitude

Reflection Loss: >15dB

Dithering: < 0.2UI

Connector: 75Ω BNC


1Ch RS-485 (full/half duplex) and support NRZ, RZI and Manchester

Max. 57600bps for RS485

Connector: Industrial standard screw terminal

4Ch Tally: A, B, C, D

Power and Environmental Indication

Operating Temperature: -10°C to +55°C

Power Input: 1A@12VDC

EMI/RFI: Meet FCC Part 15 Class A, EU EMC standard

Average Time Trouble-Free: >100000 hours

SDI Video Format Supports

625/25PAL, 525/29.97NTSC, 525/23.98NTSC, 720p50, 720p59.94, 1080P23.98/24/30/50/60, 1080i 23/24/30


                                                              Application Diagram

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