List of Official Registered Jacks
| Code | Connector | Usage |
|---|---|---|
| RJ2MB | 50-pin miniature ribbon | 2–12 telephone lines with make-busy arrangement |
| RJ11C/RJ11W | 6P2C | For one telephone line (6P4C if power on second pair) |
| RJ12C/RJ12W | 6P6C | For one telephone line ahead of the key system |
| RJ13C/RJ13W | 6P4C | For one telephone line behind the key system |
| RJ14C/RJ14W | 6P4C | For two telephone lines (6P6C if power on third pair) |
| RJ15C | 3-pin weatherproof | For one telephone line |
| RJ18C/RJ18W | 6P6C | For one telephone line with make-busy arrangement |
| RJ21X | 50-pin miniature ribbon | For up to 25 lines |
| RJ25C/RJ25W | 6P6C | For three telephone lines |
| RJ26X | 50-pin miniature ribbon | For multiple data lines, universal |
| RJ27X | 50-pin miniature ribbon | For multiple data lines, programmed |
| RJ31X | 8P8C | Allows an alarm system to seize the telephone line to make an outgoing call during an alarm. Jack is placed ahead of all other equipment. (Only 4 conductors are used) |
| RJ38X | 8P8C | Similar to RJ31X, with continuity circuit. If the plug is disconnected from the jack shorting bars allows the phone circuit to continue to the site phones. (Only 4 conductors are used) |
| RJ41S | 8P8C, keyed | For one data line, universal (fixed loop loss and programed) |
| RJ45S | 8P8C, keyed | For one data line, with programming resistor |
| RJ48C | 8P8C | For four-wire data line (DSX-1) |
| RJ48S | 8P8C | For four-wire data line (DDS) |
| RJ48X | 8P8C with shorting bar | For four-wire data line (DS1) |
| RJ49C | 8P8C | For ISDN BRI via NT1 |
| RJ61X | 8P8C | For four telephone lines |
| RJ71C | 50-pin miniature ribbon | 12 line series connection using 50-pin connector (with bridging adapter) ahead of customer equipment. Mostly used for call sequencer equipment. |
Many of the basic names have suffixes that indicate subtypes:
- C: flush-mount or surface mount
- F: flex-mount
- W: wall-mount
- L: lamp-mount
- S: single-line
- M: multi-line
- X: complex jack
For example, RJ11 comes in two forms: RJ11W is a jack from which you can hang a wall telephone, while RJ11C is a jack designed to have a cord plugged into it. (You can plug a cord into an RJ11W as well, but it usually does not look as nice as a cord plugged into an RJ11C.)
Read more about this topic: Registered Jack, Registered Jack Types
Famous quotes containing the words list of, list, official and/or registered:
“A man’s interest in a single bluebird is worth more than a complete but dry list of the fauna and flora of a town.”
—Henry David Thoreau (1817–1862)
“Every morning I woke in dread, waiting for the day nurse to go on her rounds and announce from the list of names in her hand whether or not I was for shock treatment, the new and fashionable means of quieting people and of making them realize that orders are to be obeyed and floors are to be polished without anyone protesting and faces are to be made to be fixed into smiles and weeping is a crime.”
—Janet Frame (b. 1924)
“Our medieval historians who prefer to rely as much as possible on official documents because the chronicles are unreliable, fall thereby into an occasionally dangerous error. The documents tell us little about the difference in tone which separates us from those times; they let us forget the fervent pathos of medieval life.”
—Johan Huizinga (1872–1945)
“Out of the darkness where Philomela sat,
Her fairy numbers issued. What then ailed me?
My ears are called capacious but they failed me,
Her classics registered a little flat!
I rose, and venomously spat.”
—John Crowe Ransom (1888–1974)