FRAMER AND DEFRAMER FOR OC ― 192

摘要

Synchronous Optical NETwork, or SONET as it is popularly called, is one of the most advanced telecommunications technology available on the eve of the 21st century. The SONET standard provides a layer of compatibility, which allows for the exchange of bit streams with one common format. SONET equipment can accept country specific bit streams, convert them to the SONET standard, and then pass them across the SONET network with other bit streams. The paper centers on the design of the framer and deframer for OC ―192 frames. They operate at data rate of 9.953 Gbps. The core parameters are the Al and the A2 bytes, which are added during the framing process and then removed during the deframing process. . Since the channel is noise prone, errors can peek in at any place. This added error should not delay or spoil the deframing process. Furthermore, since a 64-bit bus is considered, the framing bits may start from any bit position. So a robust design that should take care of the bit errors and skews is needed. . The architecture put forth is analyzed using various test conditions and is eventually coded using Verilog― HDL.