UPSTREAM POWER BACK-OFF METHOD IN DIGITAL SUBSCRIBER LINE AND THE DEVICE AND THE SYSTEM THEREOF

摘要

A method, a device and a system for Upstream Power Back-Off (UPBO) in a Digital Subscriber Line (DSL) are provided. The method includes: collecting subscriber line information (S50); determining a reference line length according to the subscriber line information (S52); obtaining UPBO parameters of each upstream band of each subscriber line according to the determined reference line length (S54), where the UPBO parameters include an original point parameter, a back-off slope parameter, and a maximal close frequency point (UPBOFMAX) corresponding to the band; and executing an UPBO process on the band of the corresponding subscriber line below the UPBOFMAX according to the UPBO parameters (S58). Thus, the stability of longer lines can be ensured, an upstream rate of short lines is maximally increased, and the existing UPBO mode is fully compatible.