| USOC No. | Description | Typical Application |
| RJ11W(Wall) RJ11C | Bridged configurations other than data; single line connections; bridged T/R; 6 position jack | Single line non-key telephone, ancillary devices, PBXS and key telephone systems. |
| RJ12W(Wall) RJ12C | Bridged T/R ahead of the line circuit of a key telephone system with A/A1; 6 position jack. | Single line non-key telephone sets and ancillary devices connected to a key system where registered terminal equipment is not compatible with electrical characteristics of tip and ring behind line circuit. |
| RJ13W(Wall) RJ13C | Bridged T/R behind the line circuit of a key telephone system with A/A1; 6 position jack. | Single line non-key telephone sets and ancillary devices connected to a key system. |
| RJ14W(Wall) RJ14C | Two line bridged T/R; 6 position jack. | Two line non-key telephone sets and ancillary devices. |
| RJ15C | Bridged T/R; 3 position weatherproof jack. | Providing telephone service to boats in marinas. |
| RJ16X | Bridged tip and ring with mode Indication to A Series Connection ahead of bridged connector; 6 position jack. | 9dBM (Data equipment with MI (mode indication) and MIC (mode indication common) leads. |
| RJ17C | Single line bridged tip and ring leads. Tip and ring appear on pins 1 and 6 rather than 3 and 4. Positions 2, 3, 4 and 5 are not equipped with contacts, 6 position jack. | Special non-key telephone set or certain hospital ancillary equipment in hospital critical care areas. |
| RJ18C | A bridged connection of single line tip and ring with make-busy leads MB/MB1. 6 position jack. | When the registered equipment provides a contact closure between the MB and MBI leads, a make busy indication is transmitted to the network equipment busying out the line from further incoming calls. |
| RJ19C | Bridged tip and ring behind key telephone Line Circuit plus A, A1 and Make Busy Control. 6 position jack. | When the registered equipment provides a contact closure between the MB and MBI leads, a make busy indication is transmitted to the network equipment busying out the line from further incoming calls. |
| RJ21X | Multiple line; up to 25 bridged T/R; 50 position jack. | Traffic data recording equipment. |
| RJ22X | Multi-line: up to 12 bridged T/R ahead of the line circuit of a key telephone system with A/A1 connection; 50 position jack. | 2 to 12 ancillary devices connected to a key system at one location where registered terminal equipment is not compatible with electrical characteristics of tip and ring behind the line circuit. |
| RJ23X | Multi-line: up to 12 bridged T/R behind the line circuit of a key telephone system with A/A1 connections; 50 position jack. | 2 to 12 ancillary devices connected to a key system at one location. |
| RJ24X | Multi-line: up to 5 bridged T/R behind the line circuit of a key telephone system. This arrangement has the same wiring arrangement as a standard 5 line key telephone set. | Ancillary devices connected to a key system such as 5 line conferencing devices. |
| RJ2MB | Multi-line bridge tip ending with make busy indication. | 2 to 12 non-key telephone and ancillary devices connected directly to c.o. lines with make busy requirement. |
| RJ25C | Up to three lines bridged connection 6-position jack. | Three line non-key telephone sets, ancillary devices, including message registration, automatic identification, outward dialing, and off-premise station. |
| RJ26X | Data: bridged T/R; 50 position ribbon jack, programmed. | Universal jack for fixed loss loop (FLL) or programmed (P) types of data equipment. |
| RJ27X | Bridged T/R; 50 position ribbon jack, programmed. | Programmed jack for programmed (P) types of data equipment. |
| RJ31M | Multi-line: up to 8 position series jacks. | Multiple series T/R ahead of all station equipment (reference section 68.502 (b)(1).FCC). |
| RJ31X | Series T/R ahead of all station equipment; 8 position series jack. | Alarm reporting devices. |
| RJ32M | Multi-line: up to 8 position series jack. | Multiple series T/R at station (reference section 68.502 (b)(3).FCC) |
| RJ32X | Series T/R at station; 8 position series jack. | Series ancillary devices such as such as automatic dialers. Single line sets with exclusion. |
| RJ33M | Multi-line: up to 8 position series jacks. | Multiple series T/R behind the line circuits leading to one key telephone system with A/A1 (reference section 68.502 (b) (3). FCC) |
| RJ33X | Series T/R ahead of the line circuit of a key telephone system with A/A1; 8 position series jack. | Series ancillary devices connected to a key system where registered terminal equipment is not compatible with electrical characteristics of tip and ring behind line circuit. |
| RJ34M | Multi-line: up to 8 position series jacks. | Multiple series T/R behind the line circuits of a key telephone system with A/A1 (reference section 68.502 (b)(4). FCC) |
| RJ34X | Series T/R behind the line circuit of a key telephone system with A/A1; 8 position series jack. | A single line set with exclusion or series ancillary device connected to a key system. This arrangement is preferred to arrangement shown in subsection (b) (3). FCC |
| RJ35M | Multi-line: up to 8 position series jacks. | Multiple series T/R behind the line circuits leading to one key telephone station instrument of a key telephone system, with A/A1. |
| RJ35X | Series T/R at key telephone station, behind station pickup key with A/A1; 8 position series jack. | Series ancillary devices connected to key telephone set. |
| RJ36X | Series T/R with mode indication signal; 6 position jack. | Mode indication (exclusion key) telephone set in series with data jack. Customer shall specify whether a closure or open shall indicate "exclusion" mode. |
| RJ37X | Series T/R on first line and bridged T/R on second line; 8 position series jack. | Two line telephones with exclusion on one line. |
| RJ38X | Series connection identical to RJ31X. Strap provides a continuity circuit between 2 and 7, which is used as an indication that the plug of the equipment is engaged with the jack strap provided by telephone company. | Registered alarm dialers. |
| RJ41M | Data: multiple bridged T/R; 8 position keyed data jack, universal. | Multiple installations of fixed loss loop or programmed types of data equipment. |
| RJ41S | Data: bridged T/R; 8 position keyed data jack, universal. | Universal jack for fixed loss loop (FLL) or programmed (P) types of data equipment |
| RJ42S | Data: multiple tip and ring, A and A1. Tip and ring ahead of line circuit; 8 position keyed data jack. | Universal jack for FLL or Programmed (P) types of data equipment connected to a key system where the registered terminal equipment is not compatible with electrical characteristics of tip and ring behind the line circuit. |
| RJ42M | Data: multiple tip and ring connected ahead of the line circuit, 8 position keyed data jack. | Multiple installations of fixed loss loop or programmed types of data equipment. |
| RJ43S | Data: multiple tip and ring A/A1. Tip and ring behind line circuit; 8 position keyed data jack. | Universal jack for FLL or Programmed types of data equipment connected to a key system. |
| RJ43M | Data: multiple tip and ring A/A1 tip and ring behind line circuit; 8 position keyed data jack. | Multiple installation of FLL or P data equipment. |
| RJ45M | Data: multiple bridged T/R; 8 position keyed data jack. | Multiple installations of programmed types of data equipment. |
| RJ45S | Data: bridged T/R; 8 position keyed data jack, programmed. | Programmed data equipment. |
| RJ46S | Data: Single Line bridged tip and ring, A/A1 tip and ring ahead of line circuit; 8 position keyed. | Programmed data equipment connected to a key system where the registered terminal equipment is not compatible with electrical characteristics of tip and ring ahead line circuit. |
| RJ46M | Same as RJ46S only in Multiple Mounting arrangements bridged tip and ring with or without A/A1. | Programmed data equipment connected to a key system. |
| RJ47M | Data same as RJ47S only in multiple mounting arrangements. | Programmed data equipment connected to a key system. |
| RJ47S | Data: single line bridged tip and ring. A/A1 tip and ring behind line circuit; 8 position keyed. | Programmed data equipment connected to a key system where the registered terminal equipment is not compatible with electrical characteristics of tip and ring behind line circuit. |
| RJ48C | 8 position digital services jack. | Network connection for ISDN terminal equipment using 1.544 Mbps. |
| RJ48M | 50 position miniature ribbon connector for digital services. | Multi-line (8 T& R, 8 T1 R1) connections for terminal equipment using 1.544 Mbps. |
| RJ48S | 8 position keyed digital services jack. | Network connection for local area data channels and/or sub-rate digital services. |
| RJ48T | 50 position miniature ribbon connector. | Multi-line network connection for local area data channels and/or sub-rate digital services. |
| RJ48X | 8 position digital services jack with shorting bars. | Network connection for ISDN terminal equipment using 1.544 Mbps. |
| RJM2X | Wall or rack mounting enclosure for use with multiple lines of data and voice blocks and adapters. | |
| RJ51X | Data: bridged T/R with A/A1 and Mode Indication; 50 position ribbon jack, universal; T/R connected ahead of the line circuit. | Universal jack for fixed loss loop (FLL) or programmed (P) types of data equipment requiring both Mode Indication function and A/A1 connections to a key telephone system. This configuration will normally be used in conjunction with RJ36X series configuration. |
| RJ52X | Data: bridged T/R with A/A1 and Mode Indication; 50 position ribbon jack, programmed; T/R connected ahead of the line circuit. | Universal jack for fixed loss loop (FLL) or programmed (p) types of data equipment requiring both Mode Indication function and A/A1 connections to a key telephone system. This configuration will normally be used in conjunction with RJ36X series configuration. |
| RJ53X | Data: bridged T/R with A/A1 and Mode Indication; 50 position ribbon jack, programmed; T/R connected ahead of the line circuit. | Programmed jack for programmed (P) types of data equipment requiring both Mode Indication function and A/A1 connections to a key telephone system. This configuration will normally be used in conjunction with RJ36X series configuration. |
| RJ54X | Data: bridged T/R with A/A1 and Mode Indication; 50 position ribbon jack, programmed; T/R connected ahead of the line circuit. | Programmed jack for programmed (P) types of data equipment requiring both Mode Indication function and A/A1 connections to a key telephone system. This configuration will normally be used in conjunction with RJ36X series configuration. |
| RJ71A | 8 position jack. | |
| RJ71M | 50 pin ribbon jack. | |
| RJA1X | Adapter between non-standard square-array 4 pin jack and standard 6 position plug. | Single line non-key telephone set or ancillary devices where a working 4 pin jack exists and the registered terminal equipment is equipped with a miniature 6 position plug. |
| RJA2X | Adapters between non-standard square-array 4 pin jack and standard 6 position plug. | Single line non-key telephone set or ancillary device where a working miniature 6 position jack exists. |
| RJA3X | Adapter between non-standard 12 pin jack and standard 6 position plug. | Single line non-key telephone set or ancillary devices where a working 12 pin jack exists and the registered terminal equipment is equipped with a miniature 6 position plug. |
| RJA4X | Adapter between non-standard rectangular-array 6 pin jack and standard 6 position plug. | Single line non-key telephone set or ancillary devices where a working rectangular-array jack exists and the registered terminal equipment is equipped with a miniature 6 position plug. |
| RJ1DC | Single line bridged 4-wire tip/ring and T1/R1. | Terminal equipment and systems requiring 4-wire exchange access. |
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