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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. Primary Rate Interface - Wikipedia

   en.wikipedia.org/wiki/Primary_Rate_Interface

   It is based on T-carrier (T1) transmission in the US, Canada, and Japan, while the E-carrier (E1) is common in Europe and Australia. The T1 line consists of 23 bearer (B) channels and one data (D) channel for control purposes, [ 1 ] for a total bandwidth of 24x64-kbit/s or 1.544 Mbit/s.

4. 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]

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.

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. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!