A checklist for signal routing before you commit to a design
Tom Eastley sets out the questions worth answering before a cabling, routing and intercom plan is signed off, so cameras, graphics and playout connect without surprises on the day.
Before anyone talks about routers or cable types, write down everything that produces a signal and everything that needs to receive one. Cameras, graphics machines, playback servers, remote feeds, monitors, recorders, the vision mixer and the transmission path all belong on the sheet. It sounds obvious, yet most routing problems I am asked to look at trace back to a source that was added late and never given a proper home in the plan.
Next to each entry, note the format it runs in, how far it sits from the control room and whether it needs to reach more than one place. A camera that feeds the mixer, a recorder and a confidence monitor is three destinations, not one. Counting these properly now tells you how many outputs you really need and stops the rack from being sized around a guess.
Equipment lists get most of the attention, but cable is where a live show is quietly won or lost. Measure the real routes, which are rarely the straight lines on a floor plan, and allow for the detours around doors, risers and stage edges. Then check that the chosen cable and connector types suit those lengths at the format you intend to run.
Think about how the cable will be treated as well as how it will be installed. A run that crosses a walkway needs protection, and one that is rigged and struck every week needs connectors that can take repeated handling. Labelling both ends clearly, in a scheme the whole crew can read, saves more time during a fault than any amount of clever design.
Intercom is often treated as an afterthought, bolted on once the pictures work. In practice it is the thing that lets a crew correct a problem in seconds rather than minutes. Decide who needs to speak to whom, and which conversations must never be heard by the wrong people, such as talent on a live microphone or a presenter in an earpiece.
Separate channels for the director, camera operators, audio and graphics usually keep traffic manageable. Ask how many belt packs or panels are needed, where the wired positions sit and whether anyone roams the venue. A short written channel plan, agreed at the production meeting, prevents the common situation where everyone talks on one line and nothing is heard.
Graphics and playout are where a routing plan meets the editorial side of the show. Ask where lower thirds, full-screen graphics and video clips originate, who triggers them and how they arrive at the mixer. A clip that plays perfectly in the gallery but arrives with the wrong timing or format on air is a routing question as much as a playback one.
Check the delay each path adds and whether the audio stays in step with the picture after it. Where a source is processed or converted, note it on the plan so that the audio engineer is not left to discover the offset during the line-up. It is far easier to align timing on paper in the planning stage than live in the gallery.
Every system fails somewhere eventually, so ask what happens when it does. If a single cable, power supply or router card goes down, which sources are lost and how quickly can the crew recover? You do not need to duplicate everything, but the points that would stop the show should be known and, where practical, backed up.
Spare cable, a spare converter and a simple route to bypass a failed unit are inexpensive compared with a stalled transmission. Agree beforehand who decides to switch to a backup and how that decision is passed to the rest of the crew. A rehearsal that deliberately pulls one connection teaches the team more than a plan they have only read.
The last item on the checklist is also the one most often cut for time. Run the complete chain, from camera to transmission feed, with the people who will operate it, at the format and level you will use on the day. A system that looks right on a diagram can still hide a wrong setting, a swapped connector or a monitor showing the wrong source.
Use the rehearsal to test the intercom, the graphics triggers and a deliberate fault, not only the pictures. Keep a short written note of anything that was changed so the plan on paper matches what is actually installed. That record is what lets a second crew or a later event pick the work up without starting over.
A routing design is ready to approve when every source has a destination, every cable run has been measured, the intercom has a channel plan and a failure has been thought through in advance. None of this needs special equipment, only an hour spent with the plan and the people who will use it. If you would like a second pair of eyes on yours before you decide, get in touch through the contact page.
Keep reading
A Three-Camera Talk Show That Stopped Fighting Its Own Pictures
Tom Eastley recalls a regional presenter-led show whose three cameras never quite matched, and how a methodical camera setup brought the pictures into line before transmission.
Lavalier or Handheld Microphones for Presenter-Led Shows: Which to Choose
A comparison of lavalier and handheld microphones for talk shows and live events, covering speech clarity, handling noise and crew effort, with a clear recommendation from the audio desk.
What Lighting Design Costs and What Moves the Price
A plain account of how lighting design for studio sets and live stages is priced, which parts of a brief raise or lower the figure, and what to settle early.