Patent ID: 7646789

Claim:
A communication system comprising: a plurality of communication terminals sequentially transferring data to a server during a transmission permissible period assigned to said communication terminals, and the server; wherein; at least one of said communication terminals includes a converter to convert predetermined first sets of bits in a data frame, each first set consisting of a first number of bits, into second sets of bits, each second set consisting of a second different number of bits, and a transmitter portion to transmit the second sets of bits to said server, during said transmission permissible period, and transmits a repeated bit string of a specified bit to said server, during a period other than said transmission permissible period, and said server includes a decoder to obtain said data frame, by inversely transforming said second sets of bits, after inversely transforming said repeated bit string included in said data received from said at least one communication terminal into a special code string indicating a predetermined idle state of zero signal.