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Code |
Connector |
Usage |
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RJ2MB |
50-pin micro ribbon |
2–12 telephone lines with make-busy arrangement |
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RJ9 |
4P2C or 4P4C |
Commonly referred to as a handset connector (Non-Registered) |
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RJ10 |
4P2C or 4P4C |
Commonly referred to as a handset connector (Non-Registered) |
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RJ11 (C/W) |
6P2C |
For one telephone line (6P4C if power on second pair) |
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RJ12 (C/W) |
6P6C |
For one telephone line ahead of the key system |
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RJ13 (C/W) |
6P4C |
For one telephone line behind the key system |
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RJ14 (C/W) |
6P4C |
For two telephone lines (6P6C if power on third pair) |
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RJ15C |
3-pin weatherproof |
For one telephone line |
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RJ18 (C/W) |
6P6C |
For one telephone line with make-busy arrangement |
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RJ21X |
50-pin micro ribbon |
For up to 25 lines |
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RJ22 |
4P2C or 4P4C |
Commonly referred to as a handset connector (Non-Registered) |
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RJ25 (C/W) |
6P6C |
For three telephone lines |
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RJ26X |
50-pin micro ribbon |
For multiple data lines, universal |
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RJ27X |
50-pin micro ribbon |
For multiple data lines, programmed |
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RJ31X |
8P8C |
Allows an alarm system to seize the telephone line to make an outgoing call during an alarm. Jack is placed closest to network interface than all other equipment. Only 4 conductors are used. |
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RJ32X |
8P8C |
Like RJ31X, this wiring provides a series tip and ring connection through the connecting block, but is used when the customer premise equipment is connected in series with a single station, such as an automatic dialer. |
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RJ33X |
8P8C |
This wiring provides a series tip and ring connection of a KTS line ahead of the line circuit because the registered equipment requires CO/PBX ringing and a bridged connection of the A and A1 lead from behind the line circuit. Tip and ring are the only leads opened when the CPE plug is inserted. Typical usage is for customer-provided automatic dialers and call restrictors. |
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RJ34X |
8P8C |
Similar to RJ33X, but all leads are connected behind the line circuit. |
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RJ35X |
8P8C |
This arrangement provides a series tip and ring connection to whatever line has been selected in a key telephone set plus a bridged A and A1 lead. |
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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. |
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RJ41S |
8P8C keyed |
For one data line, universal (fixed loop loss and programmed) |
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RJ45 |
8P8C |
Informal designation for T568A/T568B including Ethernet (Non-Registered) |
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RJ45S |
8P8C keyed |
For one data line, with programming resistor |
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RJ48C |
8P4C |
For four-wire data line (DSX-1) |
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RJ48S |
8P4C keyed |
For four-wire data line (DDS) |
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RJ48X |
8P4C with shorting bar |
For four-wire data line (DS1) |
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RJ49C |
8P8C |
For ISDN BRI via NT1 |
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RJ50 |
10P10C |
Often used for data (Non-Registered) |
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RJ61X |
8P8C |
For four telephone lines |
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RJ71C |
50-pin micro ribbon |
12 line series connection using 50-pin connector (with bridging adapter) ahead of customer equipment. Mostly used for call sequencer equipment. |
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Many of the basic names have suffixes that indicate subtypes:
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