DS0 - beginning of digital telephony (T1, T3, E1, E3)
6:16
PSTN - Public Switched Telephone Network
8:57
PCM - Analog to digital conversion
12:59
DS1 (T1) Fundamentals
5:30
Digital modulation: ASK, FSK, and PSK
4:39
OFDM - Orthogonal Frequency Division Multiplexing
4:31
Baseband vs Broadband
3:46
T1/E1 and T3/E3/DS3 - CompTIA Network+ N10-005: 3.4
5:48