The signal path to an LED module

A typical chain

Video source → processing → sending device → receiving cards → interface boards → LED modules. An all-in-one controller combines processing and sending. Autonomous control boards can integrate more of the chain, so a separate receiving card is not always needed.

A connector does not define its purpose

RJ45 can carry management networking or display data. These ports are not interchangeable. Optical links require matching protocols, rates, transceivers and equipment at both ends. A duplicated output does not add independent pixel capacity.

What to record

Draw devices and connections and label every port’s purpose, cable length and backup path. Record power separately: a signal diagram does not validate electrical supply or mounting. Unknown port functions must be checked in the device manual.

Create a connection register

Label both cable ends with the same identifier. Record the device and port at each end, purpose, cable type, actual length and redundancy role. Obtain length and medium requirements from both devices' documentation; there is no universal limit for all LED systems.

Locate a missing image

Check in sequence: source signal, controller input detection, selected mapping and link status. Identify where the fault begins. Do not change the cable, firmware and settings together, as that obscures the cause. Work inside equipment requires trained personnel following manufacturer instructions.

Practice: two similar RJ45 ports

A controller has a management port and a display-data output. Both look like RJ45, but connection through an ordinary network switch is permitted only where the manufacturer supports it. Use exact housing and manual labels on the as-built drawing rather than calling everything ‘internet’.

After installation compare the drawing, cable labels and device ports. Photograph connections before finishes conceal them. This speeds diagnosis and reduces the risk of incorrect switching during an event.

• Do not insert network equipment into the LED path without validation.
• Do not infer supported length solely from cable category.
• Label backup and primary routes separately.