Jerome D Strombosky

US Patent:

20020085589, Jul 4, 2002

Filed:

Sep 13, 2001

Appl. No.:

09/952479

Inventors:

Subrahmanyam Dravida - Shrewsbury MA, US
David Kravitz - Cambridge MA, US
Sanjiv Nanda - Lunenburg MA, US
Sriram Narayan - Westford MA, US
Pinar Ormeci - Dracut MA, US
Kiran Rege - Marlboro NJ, US
Vyomesh Shah - Tewksbury MA, US
Jerome Strombosky - Westford MA, US
Daniel Talbot - Hudson TX, US
Manas Tandon - Waltham MA, US
Wei Ye - Westford MA, US
Xiangdong Zhang - Westford MA, US
Dev Gupta - Concord MA, US

Assignee:

Narad Networks, Inc. - Westford MA

International Classification:

H04J003/06

US Classification:

370/503000, 370/473000

Abstract:

Hybrid fiber/coax networks employ the existing cable plant used for cable TV and transmit data signals in a frequency bandwidth above that which is used for cable TV. As this cable plant was deployed in a tree and branch topology, data transmissions may be susceptible to noise, variable transmission loss and frequency dispersion, particularly in the upstream direction. Further, due to the tree and branch topology, homes at the far end of the network experience much greater loss than do the homes that are near to the headend/ONU. The present system, which uses point-to-point data links between intelligent network elements located in the feeder/distribution network to provide reliable, secure, bi-directional broadband access. Digital signals are terminated at the intelligent network elements, switched and regenerated for transmission across additional upstream or downstream data links as needed to connect a home to a headend or router. Raw payload data is segmented and arranged in a data phase for transmission over the data links. The intelligent network elements can be co-located with or replace the standard network elements to take advantage of existing network configurations. In this manner, the data links are made over relatively short runs of coax cable, which can provide greater bandwidth than the typical end-to-end feeder/distribution connection between a home and the headend or optical network unit.