Patent ID: 6707829
Filing Date: 2004-03-16
Classification: H04J,H04N

Abstract:
A communication system providing automatic timing adjustment for alternate routing, comprising:a signal line loop for routing a signal stream between a head-end and at least one communication unit wherein the at least one communication unit sends a shortened uplink burst (SUB) to the head-end, the SUB containing an ID unique to the at least one communication unit; at least one alternate routing signal line coupled between the head-end and the at least one communication unit, said signal stream routing through the at least one alternate routing signal line being provided to form a redundant signal line loop when a fault of the signal stream through the signal line loop is detected; and an information processor at the head-end for saving a current bit offset for said at least one communication unit and for all subsequent communication units, and for adjusting a timing of the signal stream according to delay parameters calculated at the information processor at the head-end for all subsequent communication units that send a SUB containing a unique ID to the head-end, when a distance between a subsequent communication unit and the nearest communication unit is less than the size of a predetermined alignment window, and for recalculating a timing of the signal stream when the distance between a subsequent communication unit and the nearest communication unit is greater than a predetermined alignment window and the SUB from the subsequent communication unit has a bit offset that is greater than a predetermined amount different than the saved bit offset.