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第 0 级数字信号
64 kb/s
telecom.
digital signal level-0
第 1 级数字信号
1.544Mb/s,24 话路
telecom.
digital signal level-1
第 3 级数字信号
7 x DS-2,672 话路
telecom.
digital signal level-3
第 2 级数字信号
4*DS-1,96 话路
telecom.
digital signal level-2
第 4 级数字信号
6 * DS-3,4032话路
telecom.
digital signal level-4
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