12 Beacon acquisition and tracking

1. Before switching from Class A to Class B, the end-device must first receive one of the
2. network beacons to align his internal timing reference with the network.
3. Once in Class B, the end-device must periodically search and receive a network beacon to
4. cancel any drift of its internal clock time base, relative to the network timing.
5. A Class B device may be temporarily unable to receive beacons (out of range from the

7 network gateways, presence of interference, ..). In this event, the end-device has to

1. gradually widen its beacon and ping slots reception windows to take into account a possible
2. drift of its internal clock.