Patent ID: 6112072
Filing Date: 2000-08-29
Classification: B60R,H04L,Y02D

Abstract:
A method for entering and leaving a power saving operation in a system including a plurality of subscribers connected in an annular communication network, each subscriber of the plurality of subscribers having a receive circuit turning part of the subscriber on upon receipt of at least one of a plurality of preamble codes, which comprises:providing subscribers each having at least one receive circuit connected to the annular communication network;transmitting data over the annular communication network in a format prescribing a pulsed sequence of individual bit groups of identical length having specific bit positions reserved for a preamble to be decoded in the receive circuit of each subscriber;keeping at least part of each of the subscribers of the plurality of subscribers turned on during a power-saving operation of the subscriber;turning on a part of some of the plurality of subscribers turned off during the power-saving operation upon reception of a first special preamble code by the receive circuit; andturning on a part of all of the plurality of subscribers turned off during the power-saving operation upon reception of a second special preamble code by the receive circuit.