Patent ID: 6339628
Filing Date: 2002-01-15
Classification: H04J,Y10S

Abstract:
In a transmission performed using a data frame containing an overhead area and a payload area and capable of accommodating a payload in any part of said payload area, an apparatus for effecting a request to change a payload relative position in an outgoing transmission frame in order to enable a payload contained in an incoming data frame to be mapped properly into an outgoing data frame, comprising:an incoming-side PLL circuit for accepting at an input thereof a clock synchronized to data within said incoming data frame and containing selectively inhibited portions that are equal in number to portions of said data frame other than the portion of said payload contained therein, and for rearranging timings of said clock at substantially equally spaced intervals; an outgoing-side PLL circuit for accepting at an input thereof a clock synchronized to data within said outgoing data frame and containing selectively inhibited portions that are equal in number to portions of said data frame other than the portion of said payload contained therein, and for rearranging timings of said clock at substantially equally spaced intervals; and a phase comparator circuit for performing a phase comparison between an output of said incoming-side PLL circuit and an output of said outgoing-side PLL circuit, and for outputting the result of said phase comparison as a relative position change request in said outgoing data frame.