Which of the following connection mediums operates at a maximum speed of 128 Kbps?
A.
T3
B.
OC-3
C.
ISDN
D.
T1
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ISDN:
BRI 128Kbps ISDN 2 64KB+1 16KD
PRI(na) 1.480Mbps ISDN 23B+1D (all 64K) ~ T1
PRI(eur) 1.930Mbps ISDN 30B+1D (all 64K) ~ E1
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