Patent ID: 8433420

Claim:
An apparatus comprising: an implantable cardiac rhythm management module; and a telemetry circuit including: a transceiver configured to wirelessly communicate information with an external device via a plurality of channels each representing a predetermined frequency band; a telemetry controller electrically coupled to the transceiver and including a primary timer circuit; a synchronous scan timer circuit; and a memory to store a synchronous scan list, and wherein the telemetry controller is configured to: initiate communication according to a primary channel mode using a first frequency channel as the primary communication channel, wherein the primary timer circuit is reset when a response is received from the external device; detect a timeout of the primary timer circuit; initiate a scan of a next frequency channel according to a synchronous scan mode in response to the detected timeout, re-initiate communication with the external device in the primary channel mode when a response to the synchronous scan is received; and initiate a scan of a subsequent frequency channel selected according to a synchronous scan list when no response to the scan is received before a timeout of the synchronous scan timer, wherein the timeout interval of the synchronous scan timer matches a synchronous scan timeout interval in the external device.