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en.wikipedia.org/wiki/Digital_Signal_1

Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. ... A DS1 telecommunication circuit is made up of twenty-four 8-bit channels (also known ... Corruption or loss of the signal will produce "red alarm". ... systems, called DS1, DS2, DS3, and DS4 are now carried on T1 infrastructure.

en.wikipedia.org/wiki/Digital_Signal_3

A Digital Signal 3 (DS3) is a digital signal level 3 T-carrier. It may also be referred to as a T3 line. The data rate for this type of signal is 44.736 Mbit/s (45 Mb). DS3 is also known as a T3 Line. DS3 uses 75ohm coaxial cable and BNC connectors. This level of carrier can transport 28 DS1 level signals within its payload. ... This level of carrier can transport 672 DS0 level channels within its payload.

www.lageman.com/bandwidth.htm

HDSL, 784+Kbps, Typically matching send/receive rates, can reach T1 ... DS3, 44.736Mbps, 672 channels (T3) ... DS3 Euro, 34.368Mbps, 480 channels + 2 D.

www.ds3today.com/articles/ds1-ds3-bandwidth.php

DS3 and DS3 digital signal levels are related to T1 and T3 lines, and to each other. ... Digital transmission carries many conversations on few wires and eliminates the ... 28 DS1 signals, the equivalent of 672 DS0 voice channels, you get a DS3. ... DS1 and T1 can be said to have a bandwidth 1.5 Mbps. DS3 and T3 can be ...

t1rex.blogspot.com/2005/02/whats-difference-between-t3-ds3-and.html

Feb 8, 2005 ... DS3 is made up of 28 DS1 channels or 672 DS0 channels. ... surprised to learn that one OC3 can carry 3 DS3, 84 DS1, or 2,016 DS0 channels? ... you need, T1 Rex can find you the best rates from multiple competing carriers.

www.t1rex.com/ds1t1.html

That same channel can also be used to carry 64 Kbps of data rather than a ... For instance, an OC3 fiber optic carrier can deliver 3 DS3 services or 84 DS1 ...

www.t1rex.com/ds3.html

T1 Rex explains the telecommunication terms DS3, T1, T3 and OC-3 and ... OK, group 28 DS1 channels together (equivalent to 28 T1 lines) and you have a DS3 or ... The highest OC level you can get at present is OC-768 which runs at 39,512 ... speed of a T1 line, then you are better off with multiple T1 lines or connecting ...

www.dcbnet.com/notes/9611t1.html

The interface to the customer can be either a T1 carrier or a higher order multiplexed facility such ... in the early 1970's to carry one Picturephone channel or 96 voice channels. ... T1. 1. 24. 1.544. DS-1C. T1C. 2. 24. 3.152. DS-2. T2. 4. 96. 6.312. DS-3. T3 .... This was too much time to be out of service so new algorithms were ...

www.centurylink.com/wholesale/ds1.html

Multiple DS1 circuits can be combined into Digital Signal, level Three (DS3) for ... Mbps. Voice, data and video communications can be carried over the channel.