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Modular connector — registered jack
A modular connector is a type of electrical connector for cords and cables
of electronic devices and appliences, such as telephones, handsets,
headsets and computer networking interfaces. The connector was originally
developed in the 1960s by Bell Labs,
for use on specific telephone sets.
In 1976 they were adopted by the FCC as a legal standard in the United States
for all telephone sets, after which they became knows as Registered Jack (RJ)
[1][2]. Here are some examples:
Although the Registered Jack is officially an American standard, it has
meanwhile been adopted worldwide. Many types and variants exist, each
identified by the letters RJ followed by two digits that express the type.
This defines the interface however, and not the actual number of contacts.
To describe the connector more accurately, it is better to use the
original Modular Connector designator, as it specifies the number of
positions (P) and the actual number of contacts (C). In the above examples
these designators are listed below the RJ-designator. Below are a number of
popular wiring schemes for modular connectors,
in which A = ring and B = tip.
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The most common convention for connecting an
analogue telephone set to a
POTS network, is by using the middle two contacts (3 and 4) of an RJ11
connector, This connector is also known as 6P2C, as it has 6 positions for
contacts, of which only 2 are populated.
This connector type is commonly also used on the equipment itself.
Different confurations are used for
multi-line subscriptions.
In the specifications below, the two wires of a single line
are denoted (A) and (B).
Most countries in the world have adopted the
US standard, but there are a few exceptions,
notably the United Kingdom (UK) and Belgium.
➤ More on this topic
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POTS 1-line
RJ11 (6P2C) — US/EU standard
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- not present
- not present
- Line (A)
- Line (B)
- not present
- not present
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POTS 1-line
RJ14 (6P4C) — UK standard
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- not present
- Line (A)
- not present
- not present
- Line (B)
- not present
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POTS 1-line
RJ14 (6P4C) — Belgian standard
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- not present
- not present
- not present
- Line (A)
- Line (B)
- not present
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POTS 2-line
RJ14 (6P4C) — US standard
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- not present
- Line 2 (B)
- Line 1 (A)
- Line 1 (B)
- Line 2 (A)
- not present
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POTS 3-line
RJ25 (6P6C) — US standard
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- Line 3 (B)
- Line 2 (B)
- Line 1 (A)
- Line 1 (B)
- Line 2 (A)
- Line 3 (A)
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POTS 4-line
RJ45 (8P8C) — Crypto Museum standard
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- Line 3 (A)
- Line 3 (B)
- Line 2 (A)
- Line 1 (A)
- Line 1 (B)
- Line 2 (B)
- Line 4 (A)
- Line 4 (B)
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Handset / headset
RJ-9 (4P4C)
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Microphone (1) black Speaker (1) red Speaker (2) green Microphone (2) yellow
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Below is the common wiring scheme for Cat 3 and Cat 5 unshielded twisted pair
ethernet cabling. Note that for speeds up to 100 Mb/s (10BaseT and 100BaseT)
only two pairs (2 and 3) of the 4-pair cable are used for receive (RX) and
transmit (TX) respectively. For higher speeds (gigabit and beyond), all four
pairs are used in both directions, using special modulation techniques
[3][4].
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Pair 3 (B) TX orange/white Pair 3 (A) TX orange pair 2 (B) RX green/white Pair 1 (A) - blue Pair 1 (B) - blue/white Pair 2 (A) RX green Pair 4 (B) - brown/white Pair 4 (A) - brown
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Serial port (RS232)
RJ-45 (8P8C)
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An RJ-45 (8P8C) connector is sometimes used on network equipment,
such as internet switches and routers, for connection of a 'dump' terminal.
It allows its configuration to be changed from a regular PC or laptop
that is equipped with terminal emulation software (e.g. VT102) and an
RS232 interface (COM port). On modern computers the COM port can be
emulated with an USB adapter.
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RTS Request To Send DTR Data Terminal Ready TXD Transmit Data GND Gound GND Ground RXD Receive Data DSR Data Srt Ready CTS Clear To Send
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- Modular connector
- Modular jack
- Registered jack
- RJ-connector
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© Crypto Museum. Created: Sunday 04 April 2021. Last changed: Monday, 15 April 2024 - 08:48 CET.
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