- See main article Line code
Line coding consists of representing the digital signal to be transported, by an amplitude- and time-discrete signal, that is optimally tuned for the specific properties of the physical channel (and of the receiving equipment). The waveform pattern of voltage or current used to represent the 1s and 0s of a digital signal on a transmission link is called line encoding. After line coding, the signal can directly be put on a transmission line, in the form of variations of the current. The common types of line encoding are unipolar, polar, bipolar and Manchester encoding.
Line coding should make it possible for the receiver to synchronise itself to the phase of the received signal. It is also preferred for the line code to have a structure that will enable error detection.
Examples of line coding include: (see main article line code)
- B8ZS
- HDB3
- 2B1Q
- AMI
- Gray coding
Read more about this topic: Node-to-node Data Transfer
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