Vyomesh F Shah

US Patent:

20020075875, Jun 20, 2002

Filed:

Sep 13, 2001

Appl. No.:

09/952381

Inventors:

Subrahmanyam Dravida - Shrewsbury MA, US
Sriram Narayan - Westforf MA, US
Frederick Peralta - Lynn MA, US
Kiran Rege - Marlboro NJ, US
Vyomesh Shah - Tewksbury MA, US
Manas Tandon - Waltham MA, US

Assignee:

Narad Networks, Inc. - Westford MA

International Classification:

H04L012/28
H04L012/56

US Classification:

370/395210, 370/395410, 370/412000

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. The intelligent network elements can be co-located with or replace the standard network elements to take advantage of existing network configurations. The standard network elements can be selectively replaced by the intelligent network elements in an incremental approach. Packet handling at a network element includes receiving packets on input links coupled to the network element, each packet having a quality of service (QoS) class indicating a service priority ranging from highest (1) to lowest (N). Received packets for each of the QoS classes from 1 to N-1 are stored in a common queue per QoS class while packets received for the lowest (N) QoS class are stored in link queues corresponding to the input links. The packets are transmitted from the common queues and the plural link queues to an output link according to a scheduling discipline. 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.

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.

US Patent:

54045606, Apr 4, 1995

Filed:

Jun 25, 1993

Appl. No.:

8/083852

Inventors:

Raymond Y. Lee - Salem NH
Jeffrey M. Bessolo - Groton MA
Vyomesh Shah - Tewksbury MA
Scott D. Vincelette - Bethlehem PA
Steven M. Waldstein - Westford MA
Jeffrey D. Nathan - Andover MA
Steven E. Lang - Lincoln Center MA

Assignee:

Wang Laboratories, Inc. - Lowell MA

International Classification:

G06F 1500

US Classification:

395800

Abstract:

A central processing unit (CPU) 10 comprises an external control memory for storing microinstructions which correspond to macroinstructions read from a system memory. The microinstructions are 56 bits in length and are read in 28-bit segments. CPU 10 also comprises an internal memory management unit (MMU) 18 which comprises a plurality of address translation entry (ATE) registers four of which are permanent and sixteen of which are temporary in that the storage of a new translation entry occurs in a least recently used temporary translation entry register. CPU 10 also comprises a plurality of status register bits, some of which are settable only by predefined microinstructions. All of the status register bits are branchable. CPU 10 further comprises a condition code register the state of which may be determined by input signal pins. CPU 10 also comprises address generation logic which may generate a 24, 31 or 32 bit address upon a 32-bit address bus.