Universal Service Ordering Code (USOC)
Definition - What does Universal Service Ordering Code (USOC) mean?
Techopedia explains Universal Service Ordering Code (USOC)
The specification includes the physical construction, wiring and signal semantics used in the jacks that are primarily named using the letters RJ followed by two digits that represent the type of jack and then letter suffixes that are added to further indicate some minor variations. The most commonly used today are RJ11 and RJ45, which are used in telephones and modems and in network connections, respectively.
Variations specified by the letter suffix:
- C — Identifies a surface or flush-mount jack
- W — Identifies a wall-mounted jack
- S — Identifies a single-line jack
- M — Identifies a multi-line jack
- X — Identifies a complex multi-line or series-type jack