simplex
four wire circuit
full duplex
half duplex
carrier signal
baseband signal
primary singal
None of these
inserting a ′0 ′ in user stream to differentiate it with a lag
inserting a ′0 ′ in lag stream to avoid ambiguity
appending a nibble to the lag sequence
appending a nibble to the use data stream
half-duplex
full-duplex
All of these
106 to 108 Hz
1010 to 1011 Hz
103 to 104 Hz