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T1
An AT&T term for a digital carrier facility used to transmit a DS1 formatted digital signal at 1.544 megabits per second.
T1 transmission uses a bipolar Return To Zero {alternate mark inversion} line coding scheme to keep the DC carrier component from saturating the line.
Although some consider T1 signaling obsolete, much equipment operates at the "T1 rate" and such signals are either combined for transmission via faster circuits, or demultiplexed into 64 kilobit per second circuits for distribution to individual subscribers.
T1 signals can be transported on unshielded twisted pair telephone lines. The transmitted signal consists of pips of a few hundred nanoseconds width, each inverted with respect to the one preceding. At the sending end the signal is 1 volt, and as received, greater than 0.01 volts. This requires repeaters about every 6000 feet.
The information is contained in the timing of the signals, not the polarity. When a long sequence of bits in
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