Transmission methods
A bit (binary digit) is the smallest unit of information
• N = 2n where N is the number of representations and n is the
number of bits (ex. ASCII, Unicode, PCM code etc.)
• Data communications transfer information using codes that
are transmitted as signals (either analog or digital)
• In general, analog lines provide a slow service that contains
high error rates. However, digital lines cannot transmit
analog data unless it is converted to a binary format first
• Encoder is used to convert the information transmitted by
the sender and decoder converts the information back to its
original form for the receiver...
