Symmetric line coding

A method comprising the steps of:

• receiving a binary input stream d;
• dynamically defining a value for each of a pair of binary bits p and q in response to the binary input stream d;
• and
• dynamically generating the output pair of bitstreams as an output, v1 and v2, where the generating is performed in accordance with the following
• (a) if d=1, then v1=p and v2=qp, and
• (b) if d=0, then v1=(1−q) and v2=q.

A symmetric line coding apparatus, comprising:

• an input port for receiving a binary input signal d;
• a circuit coupled to the input port to dynamically define a value for each of a pair of binary bits p and q in response to the binary input stream d;
• a pair of output ports coupled to the circuit, whereby the circuit dynamically generates an pair of bitstreams, v1 and v2, for output at the pair of outputs ports and the generating is performed in accordance with the following
• (a) for a binary input d of a value, then both v1 and v2 are supplied with same value of either binary bit p or binary bit q, and
• (b) for a complement to the value of binary input d, then supply to the output pair, a value of an other binary bit p or q that was not supplied in step (a) and a complement to the other binary bit p or q.

A symmetric line coding apparatus, comprising:

• an input port for receiving a binary input signal d;
• a circuit coupled to the input port to dynamically define a value for each of a pair of binary bits p and q in response to the binary input stream d;
• a pair of output ports coupled to the circuit, whereby the circuit dynamically generates an pair of bitstreams, v1 and v2, for output at the pair of outputs ports and the generating is performed in accordance with the following
• (a) if d=1, then v1=p and v2=qp, and
• (b) if d=0, then v1=(1−q) and v2=q.