Method, apparatus and system for changing to which remote device a local device is in communication via a communication medium through use of interruption of the communication medium

A method of communicating comprising:

• in response to a local device, toggling a transmitter On and Off in a pattern to generate multiple consecutive On/Off bits having On/Off signals with a same pulse width that represents control information, said transmitter configured to transmit data via a communication medium at a first end thereof, the communication medium also having a second end;
• interrupting said communication medium at said first end corresponding to said pattern, each interrupting of said communication medium at said first end resulting in a detection of a loss of signal at said second end;
• using a detection of a respective loss of signal at said second end for detecting the pattern of interruption of said communication medium at said second end so as to determine said control information;
• and
• in response to said detection, changing to which remote device of a plurality of remote devices said local device is in communication via said communication medium.