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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. Public switched telephone network - Wikipedia

   en.wikipedia.org/wiki/Public_switched_telephone...

   A Digital Signal 1 (DS1) circuit carries 24 DS0s on a North American or Japanese T-carrier (T1) line, or 32 DS0s (30 for calls plus two for framing and signaling) on an E-carrier (E1) line used in most other countries. In modern networks, the multiplexing function is moved as close to the end user as possible, usually into cabinets at the ...

4. 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.

5. 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 ...

6. Telephone line - Wikipedia

   en.wikipedia.org/wiki/Telephone_line

   In most cases, two copper wires (tip and ring) for each telephone line run from a home or other small building to a local telephone exchange. There is a central junction box for the building where the wires that go to telephone jacks throughout the building and wires that go to the exchange meet and can be connected in different configurations ...

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!