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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

If you bundle 28 DS1 signals, the equivalent of 672 DS0 voice channels, you get a DS3 ... In a process called multiplexing, multiple DS1 and DS3 signals 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.dcbnet.com/notes/9611t1.html

The interface to the customer can be either a T1 carrier or a higher order multiplexed facility ... was implemented in the early 1970's to carry one Picturephone channel or 96 voice channels. ... DS3, 44.736 Mbps, 28 T-1, 672 Channels .... This was too much time to be out of service so new algorithms were developed that ...

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.ethernetbuildings.com/articles/50Mbps-Ethernet-DS3.php

So if you have a 1.5 Mbps T1 line and you upgrade to DS3 service, your new ... These channels can also be used to carry data packets instead of phone ...

www.t3rex.com/articles/ds3t3.php

DS3 T3 Tutorial offers the technical background and applications for DS3 over T3 lines. ... How about as much as 28 T1 lines or 45 Mbps? That's enough throughput for broadcast quality video ... A T1 line can carry 24 of these DS0 channels.

www.anderbergfamily.net/ant/dsxbeer

Jan 2, 2013 ... The telephone industry is full of confusing terminology, much of which isn't ... is often called a T1 if it is being carried on copper wire via T-carrier systems. ... A DS3 contains 672 DS0s, and each one can have unique circuit IDs for ... to deploy OC768 circuits, especially where fiber channel capacity is limited.