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  2. British telephone socket - Wikipedia

    en.wikipedia.org/wiki/British_telephone_socket

    A domestic single British telephone line installation will have a single master socket or line box in the premises, which is provided by BT or another service provider: this socket is the demarcation point between the customer-owned and maintained on-premises wiring, and the telephone network.

  3. Digital access carrier system - Wikipedia

    en.wikipedia.org/wiki/Digital_Access_Carrier_System

    The first subscriber's phone (called the 'audio customer') would be connected as normal. The second subscriber (called the 'carrier customer') would have his phone calls modulated on to an RF carrier or Carrier wave on the same physical phone line at around 40 kHz – high enough not to be noticeable to the audio customer.

  4. System X (telephony) - Wikipedia

    en.wikipedia.org/wiki/System_X_(telephony)

    The DMSU network in London has been gradually phased out and moved onto more modern "NGS" switches over the years as the demand for PSTN phone lines has decreased and BT has sought to reclaim some of its floorspace. The NGS switch referred to is a version of Ericsson's AXE10 product line, phased in between the late 1990s and early 2000s.

  5. Telecommunications in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_in_the...

    BT is still the main provider of fixed telephone lines and it has a universal service obligation, although companies can now contract Openreach to install a phone line on their behalf, rather than telling the customer to get BT to install it, then transfer over. [citation needed]

  6. BT 21CN - Wikipedia

    en.wikipedia.org/wiki/BT_21CN

    The 21st Century Network (21CN) programme is the data and voice network transformation project, under way since 2004, [1] of the UK telecommunications company BT Group plc. ...

  7. Redcare - Wikipedia

    en.wikipedia.org/wiki/RedCARE

    BT Redcare is the largest supplier of alarm signalling services for security and fire in the UK. It was established over thirty years ago, and works with both the business and domestic markets. Redcare is a widely deployed service from BT, used in the UK. Redcare signalling is fitted by alarm installation companies (“installers”), then ...