Bassanio Wing Law

US Patent:

7266112, Sep 4, 2007

Filed:

Jan 23, 2002

Appl. No.:

10/056102

Inventors:

Bassanio Law - Fremont CA, US
Shamim Shariffudin Pirzada - Milpitas CA, US
Shaji Ravindra Nathan - Sunnyvale CA, US

Assignee:

Cisco Technology, Inc - San Jose CA

International Classification:

H04L 12/46
H04L 12/66
G06F 15/16

US Classification:

370352, 370401, 370474, 379 8817, 379 9307, 709203, 709218, 709225, 709249

Abstract:

A Dial Access Stack Architecture (DASA) includes a stack of Network Access Servers (NASs) each independently establishing and processing information for communication links on a public telephone network. A primary interconnect couples the stack of network access servers together through a primary network. A routing engine is coupled through the primary interconnect to the stack of network access servers routing packets between the network access servers and an Internet network. A secondary interconnect couples the stack of network access servers together through a secondary network that operates independently of the primary interconnect. The primary or secondary interconnects each allow pairs of the network access servers to communicate with each other in parallel and independently of the routing engine. The DASA provides scalability and resiliency to fault conditions and can easily aggregate and integrate any new access media. Applications such as voice, video and multicasting can be seamlessly added.

US Patent:

6373838, Apr 16, 2002

Filed:

Jun 29, 1998

Appl. No.:

09/107187

Inventors:

Bassanio Law - Fremont CA
Shamim Shariffudin Pirzada - Milpitas CA
Shaji Ravindra Nathan - Sunnyvale CA

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 1246

US Classification:

370352, 370401, 379 8817, 379 9307, 379221, 709203, 709218, 709225, 709249

Abstract:

A Dial Access Stack Architecture (DASA) includes a stack of Network Access Servers (NASs) each independently establishing and processing information for communication links on a public telephone network. A primary interconnect couples the stack of network access servers together through a primary network. A routing engine is coupled through the primary interconnect to the stack of network access servers routing packets between the network access servers and an Internet network. A secondary interconnect couples the stack of network access servers together through a secondary network that operates independently of the primary interconnect. The primary or secondary interconnects each allow pairs of the network access servers to communicate with each other in parallel and independently of the routing engine. The DASA provides scalability and resiliency to fault conditions and can easily aggregate and integrate any new access media. Applications such as voice, video and multicasting can be seamlessly added.