The bidirectional transmission to write or read out data is executed between a read/write unit and a memory module by the contactless electromagnetic coupling using induction coils. A spread spectrum communication technique is used in at least the up transmission to transmit data from the memory module...http://www.google.de/patents/US5070500?utm_source=gb-gplus-sharePatent US5070500 - Memory package system utilizing inductive coupling between memory module and read/write unit
