Technique to Transmit Differential Manchester Encoded Signals on Common Carrier Facilities
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Described is an apparatus and method for transporting data, encoded in accordance with ANSI/IEEE local area network standard 802.5, over an asynchronous DS2 common carrier facility. Thus, stations on separate token ring networks may communicate with each other if the token ring networks are interconnected with common carrier facilities. The method includes the frame format set forth in the accompanying figure. The format is used to shuttle data, on the DS2 common carrier facility, between the token rings. The frame is comprised of twelve or thirteen bits, made up of one byte of differential Manchester (DM)- coded data, split into two nibbles (MSN and LSN), a byte-type bit (T), three stuff indicator bits (S) and a possible stuff bit (X).