Transmitting data processing system

A transmit data processing system for relaying transmit data with a preamble pattern through a plurality of nodes located along a transmission line, said transmit data processing system, in one of nodes, comprising:

• means for receiving a first frame comprising a first preamble pattern, having a bit length, and the transmit data;
• means for extracting a clock signal from said first preamble pattern, thereby extracting a beginning part of said first preamble pattern;
• means for producing said first frame as a second frame using said clock signal, said second frame comprising a second preamble pattern followed by said transmit data, said second preamble pattern having a bit length shorter than the bit length of said first preamble pattern by the length of said extracted beginning part;
• means for forming a created preamble pattern equal to the first preamble pattern from the second preamble
• means for producing a restored frame comprising said created preamble pattern followed by said transmit data;
• and
• means for sending said restored frame from said node.