T3 meaning

A 44.736 Mbps point-to-point, digital dedicated line provided by the telephone companies. A T3 line provides 672 64-Kbps voice or data channels. T3 channels are widely used on the Internet, although major backbones typically use optical networks (see SONET). See T-carrier and DS.
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Three days after a security has been purchased and the trade settles. Thus T+3 is the trade date plus 3 days and is the typical time it takes for both parties to receive their respective money or securities. The securities industry has a goal to reach T+1 (trade date plus 1 day) by 2004. T+0 indicates settlement at the end of the day.
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Corresponds to DS-3 (Digital Signal Three), the third level in the North American T-carrier digital hierarchy. Designed for long-haul transmission in support of interoffice trunking in the public switched Digital Circuit DS-1 Framing Bit Byte Frame Host 1 2 ... 24 Buffer Buffer TDM TDM ... 24 ... 24 ... 24 ... 2 1 2 1 2 1 ... 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 0 0 1 1 0 0 1 19 20 21 22 23 24 24 ... 24 ... 24 1 2 1 2 1 2 1 2 24 telephone network (PSTN), T3 runs at a signaling rate of 44.736 Mbps. A T3 actually begins as four T1s multiplexed into a T2, by an M13 (Multiplex T1 to T3) mux, which then multiplexes seven T2s to yield a signaling rate of 42.924 Mbps. Stuff bits are added to adjust for variations in the clocking rates of the incoming T2s, bringing the signaling rate up to 44.736 Mbps, comprising 672 DS-0 channels at 64 Kbps.T3 will run over a four-wire twisted-pair circuit, but for no more than 50 feet, due to issues of signal attenuation. Other media, such as coaxial cable, microwave, and optical fiber, are more appropriate. See also bit stuffing, channel, digital hierarchy, DS-0, four-wire circuit, long haul, multiplexer, PSTN, signaling rate, T-carrier, and trunk.
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A set of standards for facsimile (fax) machines published by the ITU-T in 1978. Machines conforming to T.2 later became known as Group II. See also facsimile, Group II, ITU-T, T.2, T.4, and T.6.
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