Flexible tributary interface
View Patent ↗A system and method are provided for transporting Plesiochronous Digital Hierarchy (PDH) tributaries. The method accepts a plurality of PDH tributaries; generates a serial data stream of interleaved PDH tributaries; generates a serial control stream of signals for recovering the PDH tributaries; and, generates a clock signal for timing the data and control streams. The serial data stream of interleaved PDH tributaries is loaded into the payload of a data frame structure. Likewise, the serial control stream is loaded into the payload of a control frame structure. The data bytes of the serial data stream and the control bytes of the serial control stream are both transmitted at the same data rate. That is, there is a control byte generated for each data byte. Thus, the control bytes in the control frame structure are aligned with corresponding data bytes in the data frame structure.
1. A method for receiving transported Plesiochronous Digital Hierarchy (PDH) tributaries, the method comprising:
a receiver accepting an electromagnetic waveform representing a serial data stream of PDH tributaries interleaved into a payload of a data frame structure;
accepting an electromagnetic waveform representing a serial control stream of signals, for recovering the PDH tributaries, loaded into the payload of a control frame structure with a control byte for every data byte;
accepting an electromagnetic waveform representing a clock signal for timing the data and control streams;
disinterleaving the interleaved PDH tributaries in response to the clock signal and serial control stream, and,
supplying an electromagnetic waveform representing the plurality of disinterleaved PDH tributaries.
2. A system for transporting Plesiochronous Digital Hierarchy (PDH) tributaries, the system comprising:
a receiver including:
a control disinterleaver having an input for receiving a serial control stream with a control frame structure payload including a control byte for every data byte, and an output for supplying disinterleaved control bytes;
a clock for receiving a clock signal in a clock serial stream; and,
a data disinterleaver having an input for receiving a serial data stream of PDH tributaries interleaved into a payload of a data frame and an output supplying a plurality of PDH tributaries disinterleaved in response to the clock signals and the control bytes.