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2. Telephone jack and plug - Wikipedia

   en.wikipedia.org/wiki/Telephone_jack_and_plug

   For example, telephone cables in the UK typically have a BS 6312 (UK standard) plug at the wall end and a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the ...

3. Registered jack - Wikipedia

   en.wikipedia.org/wiki/Registered_jack

   Cords connecting to an RJ11 interface require a 6P2C connector. Nevertheless, cords sold as RJ11 often use 6P4C connectors (six position, four conductor) with four wires. Two of the six possible contact positions connect tip and ring, and the other two conductors are unused. RJ11 is commonly used to connect DSL modems to the customer line.

4. Modular connector - Wikipedia

   en.wikipedia.org/wiki/Modular_connector

   Although commonly referred to as RJ45 in the context of Ethernet and category 5 cables, RJ45 originally referred to a specific wiring configuration of an 8P8C connector. [ 14 ] [ 15 ] [ 16 ] The original telephone-system-standard RJ45 plug has a key that excludes insertion in an un-keyed 8P8C socket.

5. Structured cabling - Wikipedia

   en.wikipedia.org/wiki/Structured_cabling

   In the United Kingdom, an adapter must be present at the remote end as the 6-pin BT socket is physically incompatible with 8P8C. It is common to color-code patch panel cables to identify the type of connection, though structured cabling standards do not require it except in the demarcation wall field. [specify]

6. Keystone module - Wikipedia

   en.wikipedia.org/wiki/Keystone_module

   Some keystones use a pass-through type connector, where there is a jack on both the front face and the rear side. Others only have a jack on the front and employ a different mechanism for hard-wiring signal cables to the rear, such as a mini 110 block , an insulation-displacement connector , or a crimp or solder connection.

7. ANSI/TIA-568 - Wikipedia

   en.wikipedia.org/wiki/ANSI/TIA-568

   Perhaps the most comprehensive known and most discussed feature of ANSI/TIA-568 is the definition of the pin-to-pair assignments, or pinout, between the pins in a connector (a plug or a socket) and the wires in a cable. Pinouts are critical because cables do not function if the pinouts at their two ends aren't correctly matched.