US Patent No: 6,301,223

Number of patents in Portfolio can not be more than 2000

Method of using routing protocols to reroute packets during a link failure

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Abstract

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An asymmetrical network for coupling customer-premises Internet hosts such as personal computers to the Internet. The head end of a CATV system has a high-bandwidth connection to the Internet. The down link connecting the personal computers to the Internet is the cables provided by the CATV system; the up link is a telephone connection to the head end. A router is connected to the down link by means of an RF modem, to the up link by means of an analog modem, and to a LAN which is connected to the Pcs. The router routes IP packets for the hosts that are received on the CATV cable to the hosts via the LAN; it routes IP packets from the hosts that are destined for the Internet to the head end via the telephone line. The asymmetrical network conserves IP addresses and addresses on the CATV cable by dynamically allocating the IP addresses for an RF modem's hosts and an address on the CATV cable for the RF modem in response to a request made by the RF modem via the telephone line. It further saves IP addresses by assigning a non-unique IP address to the router for use inside the LAN. When the CATV system fails, the asymmetrical network automatically begins to use the telephone line as both the up link and the down link, and when the CATV system is restored, the asymmetrical network automatically returns to using the CATV cable as the down link and the telephone line as the up link. A further feature of the asymmetrical network is that the head end components and the RF modem have IP addresses, so that standard TCP/IP protocols can be used to control the asymmetrical network.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SCIENTIFIC-ATLANTA, INC.LAWRENCEVILLE, GA605

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bowcutt, Roy A Alpharetta, GA 12 420
Hrastar, Scott E Duluth, GA 38 1554
Merrill, Todd A Alpharetta, GA 9 255

Cited Art Landscape

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Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (28)
6,636,485 Method and system for providing quality-of-service in a data-over-cable system 54 1998
6,775,276 Method and system for seamless address allocation in a data-over-cable system 26 1998
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6,510,162 System and method for managing channel usage in a data over cable system 213 1998
6,892,229 System and method for assigning dynamic host configuration protocol parameters in devices using resident network interfaces 9 1998
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6,577,642 Method and system for virtual network administration with a data-over cable system 165 1999
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6,654,387 Method for network address table maintenance in a data-over-cable system using a network device registration procedure 21 1999
6,611,868 Method and system for automatic link hang up 45 1999
6,754,622 Method for network address table maintenance in a data-over-cable system using destination reachibility 24 1999
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6,785,292 Method for detecting radio frequency impairments in a data-over-cable system 25 1999
7,089,580 Method for improved cable modem ranging in a data-over-cable system 46 2000
6,804,262 Method and apparatus for channel determination through power measurements 18 2000
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VIRNETX INC. (20)
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7,996,539 Agile network protocol for secure communications with assured system availability 0 2005
8,051,181 Method for establishing secure communication link between computers of virtual private network 18 2007
7,987,274 Method for establishing secure communication link between computers of virtual private network 0 2007
7,933,990 Agile network protocol for secure communications with assured system availability 16 2007
7,945,654 Agile network protocol for secure communications using secure domain names 3 2007
8,572,247 Agile network protocol for secure communications using secure domain names 0 2011
8,516,117 Agile network protocol for secure communications with assured system availability 1 2011
8,516,131 System and method employing an agile network protocol for secure communications using secure domain names 0 2011
8,458,341 System and method employing an agile network protocol for secure communications using secure domain names 0 2011
8,504,696 System and method employing an agile network protocol for secure communications using secure domain names 6 2011
8,504,697 System and method employing an agile network protocol for secure communications using secure domain names 7 2011
8,560,705 System and method employing an agile network protocol for secure communications using secure domain names 0 2012
8,521,888 System and method employing an agile network protocol for secure communications using secure domain names 0 2012
8,554,899 Agile network protocol for secure communications using secure domain names 0 2012
8,868,705 Agile network protocol for secure communications using secure domain names 0 2012
8,850,009 System and method employing an agile network protocol for secure communications using secure domain names 0 2013
8,843,643 System and method employing an agile network protocol for secure communications using secure domain names 0 2013
 
CISCO TECHNOLOGY, INC. (14)
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7,881,208 Gateway load balancing protocol 20 2001
7,525,949 Forwarding for network devices 2 2002
8,001,269 Network address translation with IP redundancy 5 2002
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7,593,346 Distributing and balancing traffic flow in a virtual gateway 12 2003
7,966,409 Routing protocol based redundancy design for shared-access networks 2 2004
7,646,739 Multicast routing over unidirectional links 4 2005
7,573,888 Multicast routing over unidirectional links 2 2005
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7,808,993 Bidirectional multicast protocol with upstream and downstream join messages 4 2005
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CONSTELLATION TECHNOLOGIES LLC (3)
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MICROSOFT CORPORATION (1)
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NEC CORPORATION (1)
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QUALCOMM INCORPORATED (1)
6,553,568 Methods and systems for service level agreement enforcement on a data-over cable system 162 1999
 
SCIENTIFIC-ATLANTA, INC. (1)
6,618,353 Router for use with a link that has a set of concurrent channels 35 1997
 
THOMSON LICENSING (1)
7,584,498 Method and apparatus for enhanced cable modem operation 3 2002
 
Tierra Telecom (1)
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WHITE OAK GLOBAL ADVISORS, LLC (1)
7,020,157 Network address assignment in a passive optical network 3 2002
 
Other [Check patent profile for assignment information] (2)
8,874,771 Agile network protocol for secure communications with assured system availability 0 2007
8,050,283 Network router apparatus and method 1 2009