SDI Splitter: Distribution With Reclocking
Quick answer / TL;DR: Short answer: use a reclocking distribution amplifier rather than a passive split for SDI – the signal needs its timing restored after cable loss. Match the SDI rate (HD, 3G, 6G, 12G) and use 75-ohm coax with BNC connectors. Check the cable length against the rate: higher rates travel shorter distances.
The A/V family at a glance: four connector families, two signal worlds.An SDI splitter takes one serial digital video feed and presents it on several outputs. Unlike an audio Y cable, a proper SDI distribution amplifier re-clocks the signal, restoring the timing that cable loss has smeared.
This is the SDI guide: why reclocking matters, the coax and connector standards, and the length limits that decide whether a feed survives.
Why Reclocking Matters
| The type | The mechanism | The result |
|---|
| Passive split | Divides the signal | Loss and jitter compound |
| Reclocking DA | Restores timing | Stable outputs |
| Rate support | Per standard | A 3G unit will not carry 12G |
The reclocking is the difference between a distribution amplifier and a passive splitter, and it is the reason broadcast installations use the former.
Cable and Length
- 75-ohm coax with BNC connectors
- Higher rates travel shorter distances
- Cable quality matters more at 12G than at HD
- Every joint costs margin
The length limit is a function of the rate, which is why the same cable works for HD and fails for 12G.
Standards and Verification
| The reference | The relevance |
|---|
| SMPTE ST 292/424/2081 | SDI rate standards |
| IEC 61169 | BNC connectors |
| Field test | Signal lock at each destination |
Per-SKU rate support is not provided in the knowledge base. The standards are published; confirm the rate before specifying a splitter.
Practical Notes
Label the inputs and outputs: SDI units often have identical BNC ports and no markings after a few years in a rack. A label prevents a feed being plugged into an output.
Real-World Applications
The gallery
One camera feed to a monitor wall and a recorder: a reclocking DA with four outputs – all destinations locked, no jitter.
The 12G surprise
A 3G splitter used with a 12G source: no lock. The rate-specific unit installed – the standard had been the limit, not the cable.
Related reading: av cable — blogs/news/av-cable
Related reading: y splitter cable — blogs/news/y-splitter-cable
Related reading: rca splitter — blogs/news/rca-splitter
Frequently Asked Questions
What is an SDI splitter?
A distribution amplifier that sends one SDI feed to several outputs.
Does it need reclocking?
Yes – passive splits accumulate loss and jitter.
What cable does it use?
75-ohm coax with BNC connectors.
How far can SDI run?
Less at higher rates; 12G is much shorter than HD.
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