A Video router or Matrix are used for transporting video signals from sources or inputs to output destinations. Two video matrix units in a rack.
Inputs and outputs
The number of inputs and outputs varies dramatically. Routers are normally described by number of inputs by number of outputs e.g. 2x1, 256x256. Some video routers, by the use of additional drop in cards, allow the system to be expanded for more inputs or outputs, or to support other formats.
The signal format that the router transports can be anything from analogue composite video using PAL and NTSC. Also Broadband routers can route more than one Digital video signal format, Serial Digital Interface (SDI), HD-SDI, component video. Some routers have the ability to internally convert digital to analog and analog to digital.
Because any of the source can be routed to any destination, the internal arrangement of the router is arranged as a number of crosspoints which can be activated to pass the corresponding source signal to the desired destination.
Probel]] video matrix. Many type of broadcast automation systems can be used to control a video router via IP, or serial communications such as the RS-422 9-Pin Protocol.