JAMES MACK WESTDORP
Pilots at Gunview Farm Ct, Perryhall, MD

7573809, Aug 11, 2009

Dec 21, 2004

11/016840

Kevin S. Meagher - Bowie MD, US
James Westdorp - Perry Hall MD, US
Michael Vaughn - Duluth GA, US

CIENA Corporation - Linthicum MD

H04J 3/14, H04J 3/04

370216, 370535

A semi-transparent time division multiplexer/demultiplexer that transmits low rate tributaries from one location to another using a high rate aggregate connection, while preserving substantially all of the TOH and payload for each tributary signal. Transparency of the tributary TOH is accomplished by interleaving both the TOH and the Payload of each tributary into the high rate aggregate signal. Some TOH bytes may be tunneled or re-mapped into unused/undefined TOH locations in the aggregate signal to allow transparency of the TOH without corrupting the aggregate. Errors may be handled by tunneling BIP bytes into unused/undefined aggregate locations and updating the tunneled bytes with error masks calculated at each network elements. Alternatively errors may be forwarded by using an error mask generated from the tributary BIP locations and inserting the mask into the associated aggregate BIP locations. The mask in the aggregate BIP is updated with error masks calculated at each network elements.

6870860, Mar 22, 2005

Apr 19, 2000

09/552109

Kevin S. Meagher - Bowie MD, US
Michael Vaughn - Duluth GA, US
James Westdorp - Perry Hall MD, US

Ciena Corporation - Linthicum MD

H04J003/04

370535, 370536

A semi-transparent time division multiplexer/demultiplexer that transmits low rate tributaries from one location to another using a high rate aggregate connection, while preserving substantially all of the TOH and payload for each tributary signal. Transparency of the tributary TOH is accomplished by interleaving both the TOH and the Payload of each tributary into the high rate aggregate signal. Some TOH bytes may be tunneled or re-mapped into unused/undefined TOH locations in the aggregate signal to allow transparency of the TOH without corrupting the aggregate. Errors may be handled by tunneling BIP bytes into unused/undefined aggregate locations and updating the tunneled bytes with error masks calculated at each network elements. Alternatively errors may be forwarded by using an error mask generated from the tributary BIP locations and inserting the mask into the associated aggregate BIP locations. The mask in the aggregate BIP is updated with error masks calculated at each network elements.