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  2. T-carrier - Wikipedia

    en.wikipedia.org/wiki/T-carrier

    The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.

  3. Telephone line - Wikipedia

    en.wikipedia.org/wiki/Telephone_line

    Fixed telephone lines per 100 inhabitants, 1997–2007. Cross section of telephone cable of 1,800 twisted pairs, 1922. A newer telephone cable used to carry telephone lines from several customers. A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [1]

  4. Copper Line (San Diego Trolley) - Wikipedia

    en.wikipedia.org/wiki/Copper_Line_(San_Diego...

    The Copper Line, officially the Copper Line–East County Connector, [2] is a light rail line in the San Diego Trolley system, operated by San Diego Trolley, Inc. an operating division of the San Diego Metropolitan Transit System (MTS). Located in East County, San Diego, it operates as a shuttle between El Cajon Transit Center and Santee ...

  5. AT&T to eliminate copper wire phone lines to most users. Who ...

    www.aol.com/t-eliminate-copper-wire-phone...

    AT&T said it plans to eliminate traditional phone landline service in 20 of its 21 states by 2029. AT&T to eliminate copper wire phone lines to most users. Who stands to lose?

  6. Digital Signal 1 - Wikipedia

    en.wikipedia.org/wiki/Digital_Signal_1

    Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. [1] DS1 is the primary digital telephone standard used in the United States, Canada and Japan and is able to transmit up to 24 multiplexed voice and data calls over telephone lines.

  7. Local loop - Wikipedia

    en.wikipedia.org/wiki/Local_loop

    Local Loop. In telephony, the local loop (also referred to as the local tail, subscriber line, or in the aggregate as the last mile) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the common carrier or telecommunications service provider's network.

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