4-Ch 3G-SDI Fiber Converter with Loop Out RS485 Tally Support
Overview
The LNK-3GSDI-4V1DT Series delivers 4-channel 3G/HD-SDI video transmission with RS485 and
Tally over a single optical fiber. Designed for professional broadcast and production, it supports loop
outputs, automatic reclocking, and uncompressed digital quality. With robust build and up to 20km
transmission, it ensures reliable, low-latency performance for studios, OB vans, and live events.
Features
4-channel 3G/HD-SDI video transmission over one fiber
Supports automatic cable equalization and signal reclocking
Compatible with 3G-SDI camera systems, up to 4Ch loop output
Integrated RS485 data channel (full/half duplex) for control signals
Supports 4-channel Tally for production workflow integration
Non-compressed broadcast-grade video quality
Transmission up to 20km (optional longer distances)
Wide video format support including PAL, NTSC, 720p, 1080i, 1080p
Industrial design with -10℃ to +55℃ operating range
Compact, rack-mountable solution for broadcast and media systems
Technical Indexes
| 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 |
| Optics | 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 |
| Rise/fall time: 200ps indication |
| Overshoot: < 10% amplitude |
| Reflection loss: >15dB |
| Dithering: < 0.2UI |
| Connector: 75Ω BNC |
| Data | 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℃～＋55℃ |
| 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 23/24/30/50/59.94; |
Ordering Information
| LNK-HDSDI-4V1D4T | 4-Ch HD-SDI Video with Loop output + 1Ch backward RS485 + 4Ch Tally, SM 20km, FC, including 1 transmitter & 1 receiver, used by pairs |
| LNK-3GSDI-4V1D4T | 4-Ch 3G-SDI Video with Loop output + backward RS485 + 4Ch Tally, SM 20km, FC, including 1 transmitter & 1 receiver, used by pairs |
Application
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4-Ch 3G-SDI Fiber Converter with Loop Out RS485 Tally Support Images
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