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The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]
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 ...
It also needs a connection to the telephone line servicing the home so in situations where a back-to-base service is required it can be connected to the phone line. For details on the telephone connection see the section titled "telephone" in this article. Note the connection of the security system to the phone line requires a wiring ...
The features were provided on a line-by-line basis by the selection of particular Key Telephone Units (KTUs) plugged into a pre-wired backplane in the central control unit. Optional components of the 1A2 could also provide a function called 'I-Hold,' where a call could only be retrieved off hold at the phone that originally placed the line in ...
For four-wire data line (DSX-1) RJ48S 8P4C, keyed For four-wire data line (DDS) RJ48X 8P4C with shorting bar For four-wire data line (DS1) RJ49C 8P8C: For ISDN BRI via NT1 RJ61X 8P8C: For four telephone lines RJ71C 50-pin 12-line series connection using 50-pin connector (with bridging adapter) ahead of customer equipment.
On an ordinary two-wire telephone line, off-hook status is communicated to the telephone exchange by a resistance short across the pair. When an off-hook condition persists without dialing, for example because the handset has fallen off or the cable has been flooded, it is treated as a permanent loop or permanent signal .
Utility pole with electric lines (top) and telephone cables. Fixed telephone lines per 100 inhabitants, 1997–2007. Cross section of telephone cable of 1,800 twisted pairs, 1922. A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [1]
Premises wiring may consist of horizontal wiring, vertical wiring, and backbone cabling. It may extend from the point-of-entry to user work areas. Any type of telecommunications or data wiring is considered premises wiring, including telephone , computer/data , intercom , closed-circuit television .