DS-0 resembles DDS. It is
single digital channel of 64 Kbps
DS-1
is 1.544 Mbps service = 24 * 64 Kbps+8 Kbps of overhead
DS-2 Æ6.312
Mbps=96*64 Kbps + 168Kbps
DS-3 Æ44.376
Mbps=672*64Kbps +1.368 Mbps of overhead
DS-4 Æ274.176Mbps4032
* 64 Kbps+ 16.128Mbps overhead
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T Lines
o DS-0 DS1 are the names of the Services
o To implement those services, telephone
companies use T-lines
o These are the lines with capacities
matched to the data rates of DS-0 to DS-4
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T Lines
T Lines for Analog Lines
o T Lines are digital lines designed for
digital data
o However
they can also
be used for
analog transmission (Telephone
connections)
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