单选题Which of the following WAN technologies modulates 24 channels into a 1 5Mbps signal?（）AISDNBPSTNCOC-2DT1
单选题
Which of the following WAN technologies modulates 24 channels into a 1 5Mbps signal?（）
A
ISDN
B
PSTN
C
OC-2
D
T1
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