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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. 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.

6. Reflections of signals on conducting lines - Wikipedia

   en.wikipedia.org/wiki/Reflections_of_signals_on...

   A time-domain reflectometer; an instrument used to locate the position of faults on lines from the time taken for a reflected wave to return from the discontinuity.. A signal travelling along an electrical transmission line will be partly, or wholly, reflected back in the opposite direction when the travelling signal encounters a discontinuity in the characteristic impedance of the line, or if ...

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