Grass Valley PROFILE FAMILY v.2.5 - Manual (Page 377)

Glossary
Profile Family 377
RS-232-C
A standard serial communications interface for data communications,
commonly used for communications between a computer and modem, or to
control automated devices which don’t have a conventional computer
operating system.
RS-422
A standard serial communications interface for data communications,
similar to RS-232-C, but good for longer distance cabling. It is typically used
for communications in a broadcast or post-production environment between
devices such as VTRs, mixers, and controllers.
SCSI Channel (Small Computer System Interface)
The interface between the Profile processor and the disk array or library
system. It is fast and wide and provides for speeds up to 20 Mbytes/second
on a 16-bit bus.
SDI
An acronym for Serial Digital Interface, a standard for transmitting CCIR
601 digital video over a pair of conductors (coaxial cable).
SECAM
France and Russia use the Séquence Couleur À Mémoire standard color
format.
Serial port
Usually, the standard RS-232-C of a personal computer. Attach a serial cable
to communicate with a peripheral device such as a modem or printer.
S/N Ratio
The Signal-to-Noise Ratio, measured in decibels, is the ratio between the
maximum signal level and the noise level with no signal present. The higher
the value, the better the sound reproduction.
Source
In Profile operations, a source is any signal (video, audio, or timecode)
presented to the machine inputs. A VTR output, a satellite downlink, a
camera output, and a facility router output are all examples of sources.