CCNA Voice 640-461- Part 4 - Historic Voice: Digital Connectivity- Part 2
Time-division multiplexing (TDM)
Digital signaling Systems
Channel associated signaling (CAS)
Common channel signaling (CCS)
T1
E1
ISDN
Time-division multiplexing (TDM)
Digital signaling Systems
Channel associated signaling (CAS)
Common channel signaling (CCS)
T1
E1
ISDN
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