Patent Number: 6,298,038

Title: Transparent transport

Abstract: A configuration for a transport node of a telecommunication system comprises a pair of transparent mux/demuxs provided at two sites and connected over a high rate span. The T-Muxs provide continuity of all tribs and maintain a lower bit rate linear or ring system through the higher bit rate span. The lower bit rate linear or ring system operates as if it were directly connected without the higher bit rate midsection. For the forward direction of the traffic, the T-Mux comprises a multi-channel receiver for receiving a the trib signals and providing for each trib signal a trib data signal and a trib OAM&P signal. The data signals are multiplexed into a supercarrier data signal and the OAM&P signals are processed to generate a supercarrier OAM&P signal. A supercarrier transmitter maps the supercarrier data signal and the supercarrier OAM&P signal into a supercarrier signal and transmits same over the high rate span. Reverse operations are effected for the reverse direction of traffic. With this invention, an entire ring system does not have to be upgraded to a higher line rate due to fiber exhaust on a single span. The invention is particularly applicable to SONET OC-48/OC-12/OC-3 linear and ring networks and the high rate span could be an OC-192 line.

Inventors: Martin; David Wright (Nepean, CA), Tatar; Mohammed Ismael (Kanata, CA), Solheim; Alan Glen (Kanata, CA), Armstrong; Timothy James (Stittsville, CA), Wight; Mark Stephen (Ottawa, CA), Gagnon; Ronald J. (Nepean, CA), Nicholson; David John (Ottawa, CA)

Assignee: Nortel Networks Limited

International Classification: H04J 14/02 (20060101); H04J 3/08 (20060101); H04J 3/16 (20060101); H04Q 11/04 (20060101); H04J 001/16 ()

Expiration Date: 10/02/2018