Serial digital interface (SDI) is a family of digital video interfaces first standardized by SMPTE (The Society of Motion Picture and Television Engineers) in 1989. For example, ITU-R BT.656 and SMPTE 259M define digital video interfaces used for broadcast-grade video.
SDI is a transport format of the signal while BNC is a connector format. SDI utilizes coaxial cables which commonly entails the use of a BNC plug. SDI carries 16 channels of pulse-code modulation or PCM audio and uncompressed video that is digital in nature.
what is difference between SDI and BNC ?
BNC is a plug format, SDI is a signal transport format.
One uses a BNC connector for a variety of equipment such as television cables, and radios. In addition to that, BNC connects with SDI to allow extended signal bandwidths. On the other hand, SDI is an interface type used on high definition signals. Thus, it is essential to find a BNC connector that has a perfect fit or dimensions with the SDI you are utilizing.
Definition: SDI vs. BNC Cables
BNC or Bayonet Neil Concelman is a connector type that is commonly used on coaxial cables. The ends of basic BNC cables are mounted with male type connectors. Notably, it has a pin which connects to the cable conductor found at the center.
The rotating ring found on the outside of the BNC cable tube can lock to female connectors. This connector is usually found on monitors. It aims to increase the signal accuracy especially those sent by the video adapter.
On the other hand, SDI or Serial Digital Interface are commonly used to transmit uncompressed and unencrypted video signals. Moreover, broadcasting standard and high definition signals use this interface type. These can come along with audio and video signals.
The facilities for broadcasting primarily uses this interface type. In addition to that, it includes closed captions, test signals, and content identification.
BNC Connectors on SDI
SDI is a transport format of the signal while BNC is a connector format. SDI utilizes coaxial cables which commonly entails the use of a BNC plug.
SDI carries 16 channels of pulse-code modulation or PCM audio and uncompressed video that is digital in nature. It transmits on a coaxial cable at 75 Ohms connected with BNC.
As the signal’s bandwidth can extend on gigahertz range, SDI cables can no longer handle this. It must use proper BNC connector to handle this digital signal. Nevertheless, BNC connectors may come in different dimensions. Thus, we recommend you find a BNC connector that properly connects to SDI.