Patent ID: 6208667
Filing Date: 2001-03-27
Classification: H04J,H04L,H04Q

Abstract:
A constant phase crossbar switch system having a plurality of switch system inputs and outputs, comprising:a crossbar switch having a plurality of inputs and a plurality of outputs, said crossbar switch being operative to selectively couple a serial data stream appearing on at least one of said plurality inputs to at least one of said outputs, wherein said serial data stream is clocked at a predetermined frequency;at least one input logic circuit, said at least one input logic circuit having an input for receiving a serial data stream from a corresponding transmitter transmitting said data stream at a specified frequency for receipt at one of said switch system inputs, said input logic circuit also having an output in electrical communication with one of said inputs of said crossbar switch, said at least one input logic circuit receiving as an input an internal clock having a clocking edge and running at said specified frequency, said at least one input logic circuit including a multitap delay line having an input and a plurality of delay line outputs, said serial data stream being coupled to said input of said multitap delay line, said multitap delay line being operative to generate increasingly delayed versions of said serial data stream at successive ones of said delay line outputs, said input logic circuit being operative to select a delayed version of said serial data stream from one of the delay line outputs for application to said one input of said crossbar switch.