Registered jack

RJ connectors are from the U.S. Federal Communications Commission ( FCC) standard connectors for telecommunications cabling. The standards describe the types of plugs and sockets, as well as their contact configurations and with the letters RJ in conjunction with a number ( eg RJ -45) - in part without the hyphen ( RJ45) - designated with the letters " RJ " for Registered Jack ( standard socket) are.

Most RJ plug connections are based on modular plugs and modular jacks, but these may not be equated. There is also RJ connector, such as the RJ -21, which are based on completely different connector designs. RJ connectors are now used worldwide for telephone and network connections. Usually, cables with twisted wires (twisted pair) are used.

Designation

The RJ connectors compounds were introduced in the 1970s by Bell Laboratories in the U.S. and standardized a few years later by the Federal Communications Commission (FCC). Many American companies from the phone and telecommunication sectors, such as Western Electric, used a few of the RJ Connectors on a large scale, especially in telephone modular plug connectors. This resulted in a large spread of these connector types, from which are derived the colloquial terms such as " Western Modular plug " and simplistic " Western plug " or jack.

The plugs and sockets are available in various designs, shapes and with different numbers of contacts. To categorize the names follow a pattern: The name starts with the letters RJ, followed by two digits, the Specify Criteria to the specific connector type. It can sometimes written in brackets, followed by a " suffix " that certain additional, mostly mechanical, properties, describes:

C: Flush completed connector
S: Single connection
M: Manifold
X: Complex Connectors

Following this can be followed by a designation which the number of possible contact positions (P, for "Positions" ) and the actual number of tipped contacts ( "C" for "Contacts" ) specified. For example, a plug having six possible contact positions, of which only four are actually equipped with contacts. This plug is referred to as " 6P4C ".

Some, especially in the North American telecommunications and telephony sector are common RJ Connectors and contact distributions:

RJ- 2MB: 50- pin mini connector for two to twelve telephone lines
RJ-11C/RJ-11oW: 6P2C, for telephone access lines ( or 6P4C with power supply via the second pair )
RJ-12C/RJ-12oW: 6P6C, for one telephone line and additional control lines (also used for Mindstorms NXT and Microchip environment. )
RJ-13C/RJ-13oW: 6P4C, for one telephone line and additional control lines
RJ-14C/RJ-14oW: 6P4C, for telephone line two lines ( or 6P6C with power on third pair )
RJ -15C: three-pin waterproof connector for a phone line
RJ-18C/RJ-18oW: 6P6C, for one telephone line with "make -busy arrangement"
RJ- 21X: 50 -pin miniature plug for 25 telephone lines
RJ-25C/RJ-25W: 6P6C, for three telephone connection cables
RJ- 26X: 50- pin mini connector for multiple data lines
RJ- 27X: 50- pin mini connector for multiple data lines, configurable
RJ -31X: 8P8C 8P4C or, phone plug
RJ- 38X: 8P8C, similar to RJ -31X, with the possibility of line interruption
RJ- 41S: 8P8C, coded plug system for a data line, with universal use
RJ- 45S: 8P2C, for a data line, with an electric resistance for securely encoding
RJ- 48S: 8P8C, up to four data lines (DDS)
RJ- 48C: 8P8C, four data lines ( DSX -1)
RJ- 48X: 8P8C, such as RJ- 48C, with short circuit device ( DS1)
RJ- 49C: 8P8C, for ISDN lines, data networks
RJ- 61X: 8P8C, four phone lines, partly ISDN and data networks
RJ- 71C: 50 -pin connector with lock-up option, for up to twelve telephone connections in series, used primarily for telephone systems

Several other RJ- names have been partially established in the naming scheme, but are not part of the standard and provide therefore not strictly a RJ connector is:

" RJ- 9", " RJ- 10", " RJ- 22": 4P4C or 4P2C: primarily used in telephone receivers
" RJ -50": 10P10C, mostly used in data networks

Integrated Modular Plug

The most common used in the PC / network area and telephony area RJ connectors are modular plug. Conventional types are equipped with six contact positions, one of which at RJ-11 two ( 6P2C ), wherein RJ -14 ( as well as the rarely-used RJ -12 and RJ- 13), four ( 6P4C ) and at RJ -25 six- positions ( 6P6C ) are equipped with contacts.

On computer networks, each fully stocked eight-pin ( 8P8C ) modular plug is often " RJ - 45 " called, though it usually is RJ -48 or RJ -49 8P8C. The derived name of GG -45 provides as TERA a variant for use in data communication systems of category 7 dar. In Germany unshielded fully stocked eight-pin ( 8P8C ) modular plug is colloquially referred to as ISDN connector, shielded as " Ethernet connector ".

Outside the circles of U.S. telecommunications professionals there is often confusion and inaccuracies in the assignment of RJ- identifiers to the smaller of the above connector. The use of telephone connections six pin sockets and plugs can be wired for both RJ- 11 and RJ- 12, RJ -13, RJ- 14 or RJ -25 and several other cabling variants, which each have a " male face" is defined, the six contact positions (Poland ) is based. Here at RJ -11, only the innermost contact pair is used for RJ -14 and the rare variants cabling RJ -12 and RJ -13 four contacts and RJ -25 every six contacts. The even smaller four-pin connector, such as telephone handset can be connected to the base unit with the, occurs in no RJ standard. It is often referred to as RJ -10, RJ -22 or RJ -9, as it is less than the six-pole version.

Assignment of RJ- switching variants used in Europe to modular plug - designs

Assignment of modular plug - designs to RJ- numbers in the German retail

In the German trade are for RJ plugs and sockets, suitable pliers and cable assemblies used throughout the following (actually wrong ) designations: ( ... P. .. C = ... positions ... contacts )

Contact assignments

The modular connectors have been developed so that a four- pin modular plug will fit into a six -or eight- pin socket and there connects to the innermost four contacts, the six-pin plug fits into an eight pin connector where it connects with the central six contacts. This theoretical compatibility is sometimes not desirable from a manufacturer point of view; also has been found that it can cause end-users to connect the device to the wrong doses and destroy in extreme cases. Even with the power plug connected ISDN (40 volts) in Ethernet devices (0.75 volts) can cause destruction of the Ethernet devices.

The original concept was that the inner two contacts a pair formed, the next outer another pair and so on until the two outermost contacts that formed the fourth pair. In addition, the signal transmission has been optimized by each of the "active" and connected to ground contact of each pair alternated. This pin assignment in the eight pin connector, the outermost wires, however, are so far apart that they no longer meet the electrical requirements for high -speed LAN protocols. Therefore, under the designation TIA 568A / B assignment two variants have been standardized, in which two contacts are the adjacent third and fourth pair.

If you look from the front of the plug and the contacts are down, they are counted from left to right. It should also be noted in the numbering that is always assumed by an eight- pin connector and take four or six pin connector the pin numbers " from the center " out. Thus, for example, has a four-pole plug is not the pin numbers 1 to 4, but 3, 4, 5 and 6

Applications

Below are some assignments are exemplified by eight position modular plugs:

1 Optional for external power supply 2 Optional for E ( ground start ) and W ( for an external alarm) 3 The IGC numbered contrary to the norm, the contacts in the opposite order. The assignment shown here refers to above -standard numbering. 4 signals are measured with respect to GND

Microchip Technology Integrated Services Digital Network GG-45 Lego Mindstorms NXT 1-Wire FAI Gliding Commission

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