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SDI stands for serial digital interface. It is a broadcast standard for digital video using a single co-ax cable and BNC connectors with a 75Ohm impedance. The signal carries digital component video, audio and other control data. SDI can also be carried over optical fiber although this is generally only used for long distances in the order of hundreds of metres or yards. Although the connection is the same as that used for composite or analog component signals, the two are not compatible and cannot be interchanged without conversion between analog and digital.

SD-SDI runs at 270Mbit or 360Mbit and supports standard definition video signals without compression. It is used as the standard link between equipment in studios and edit suites.

HD-SDI uses the same physical interface but runs at 1.48Gbit, five times the data rate of standard definition. It is a component format like the SD equivalent and supports 720p, 1080i at 50Hz and 59.94Hz. Like the SD version, it carries full bandwidth video without compression. The longest physical link for HD-SDI is typically in the order of 125 metres or 400 feet. Longer cables cause signal losses that will cause unreliable data transfer although the precise length is dependent of the type of cable used.

Vision mixers or switchers often use inputs that can run as SD or HD. Some have dedicated inputs. Likewise, outputs can be switched between SD and HD in some units while others may have separate outputs offering and HD and SD version of the same content. The exact configuration depends on the manufacturer and the model.

SDI is not found outside professional broadcast environments.

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