Method and apparatus for the high speed modification of a packet address field of a transmitted packet in a frame relay system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5191582
SERIAL NO

07744894

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Apparatus and methods for modifying the address field of a packet are disclosed. The apparatus preferably includes an HDLC controller which finds the start of the packet and generates a signal indicative of the same, a sequence controller which receives the signal from the HDLC controller and controls the apparatus in response thereto, an address decoder receives the address field bytes from the HDLC controller and decodes them to provide a DLCI code therefrom, a RAM which is programmed as a DLCI translation table with outgoing DLCI codes being located at addresses which equate to the incoming DLCI codes, an address encoder which receives the outgoing DLCI code from the RAM and generates therefrom outgoing address field bytes, and a FIFO for storing the outgoing address field bytes until output is possible. Bytes received by the HDLC controller during the modification of the packet header are stored by the HDLC controller until the outgoing address field bytes are received at the FIFO. The stored bytes are then also forwarded to the FIFO, and thereafter, incoming data can be forwarded directly to the FIFO. The provided apparatus for modifying the address field of a packet introduces a minimum of delay into the packet transfer and reduces the amount of data storage required to effect the address field modification.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TRANSWITCH CORPORATIONSHELTON, CT20

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Upp, Daniel C Southbury, CT 36 913

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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Microcom Systems, Inc. (1)
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AMP Incorporated (1)
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* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 2005/0105,466 Traffic management for frame relay switched data service 2 2004
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
7522621 Apparatus and method for efficiently modifying network data frames 0 2005
 
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CISCO TECHNOLOGY, INC. (3)
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GILAT SATELLITE NETWORKS LTD. (7)
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AT&T CORP. (6)
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AT&T INTELLECTUAL PROPERTY II, L.P. (4)
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8717896 Frame relay switched data service 1 2011
9276849 Frame relay switched data service 0 2014
* Cited By Examiner