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# T1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for T1
Contemporary Examples
• This may be a critical difference for a generation reared on instant messaging and T1 connection speeds.

Historical Examples
• The temperature at the base of this layer due to the heat being continually evolved in it, is, say, T1°.

J. (John) Joly
• All the "odd" sheets are connected with T, all the "even" with T1.

Archibald Williams
• Let v1 denote the velocity of T1 at any given instant; v2 that of T2.

• Let T1 be the time of vibration when the masses are in one of the usual attracting positions.

• Half-title of "Essay on Criticism," written 1709, T1 (verso blank).

• The two thermometers are indicated as T1 and T2 and are inserted in the ingoing and outgoing water respectively.

• Collation: The same as the preceding issue, without the duplicate half-title, T1.

• Then to every such strip will correspond a strip of equal length x of the figures described by T1 and T2.

T1 in Technology

communications
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 the transmitted information would cause no pip to be sent, "bit stuffing" is used so the receiving apparatus will not lose track of the sending clock.
A T1 circuit requires two twisted pair lines, one for each direction. Some newer equipment uses the two lines at half the T1 rate and in full-duplex mode; the sent and received signals are separated at each end by components collectively called a "hybrid". Although this technique requires more sophisticated equipment and lowers the line length, an advantage is that half the sent and half the received information is mixed on any one line, making low-tech wiretaps less a threat.
See also Integrated Services Digital Network.
(1994-11-23)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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