Anisynchronous describes a type of transmission for digital signals. In anisynchronous transmission, the distance between two state changes is not always the integer multiple of the nominal step duration.
Anisynchronous and isochronous are characteristic properties, whereas synchronous and asynchronous are relationships between the transmitted signals.
Anisynchronous signals are characterized by the fact that the change of state from the data being transmitted can occur at any point in time. Since they are not bound to the clock cycle or its timing, transparent time division multiplex channels are used for the transmission of anisynchronous signals.