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 Title: |
US5617419:
Adapting switch port and work station communication adapters to data frame types with disparate formats and data rates
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Christensen, Kenneth J.; Apex, NC
Haas, Lee C.; Raleigh, NC
Noel, Francis E.; Durham, NC
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| Assignee: |
International Business Machines Corporation, Armonk, NY
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| Published / Filed: |
1997-04-01
/ 1994-09-20
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| Application Number: |
US1994000309522
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| IPC Code: |
Advanced:
H04L 12/56;
H04L 29/06;
H04Q 11/04;
H04L 29/08;
Core:
more...
IPC-7:
H04J 3/16;
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| ECLA Code: |
H04L12/56S5; H04L29/06; H04Q11/04S2; T04L12/56A2G; T04L12/56A18D5; T04L29/08A2;
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| U.S. Class: |
Current:
370/471;
370/506;
Original:
370/471;
370/506;
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| Field of Search: |
370/082,83,84,60,79,94.1,99,101,102,105.1
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| Priority Number: |
| 1994-09-20 |
US1994000309522 |
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| Abstract: |
This invention relates to "clear pipe" communication networks meaning the nodes and links handle a variety of data frame types depending on their communication protocols such as Token Ring, Ethernet, FDDI or ATM. More particularly, this invention relates to node/link interface adapters at nodes which include switching nodes and end nodes. The adapters identify data frame type and adapt the node/link adapter operative elements to handle the various types of data frames as they travel through the network. The invention identifies the frame type at the source, flags the frame type to the nodes by use of unique SDEL (start delimiter) symbols or codes, uses the SDEL codes as received with the frame at each node to find the destination address in the frame and to adjust the transmission rate for the frame. The transmission rate is adjusted by inserting null non-data symbols in the frame to effectively slow the data rate to the data rate capacity of the protocol.
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| Attorney, Agent or Firm: |
Cockburn, Joscelyn G. ;
Knearl, Homer L. ;
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| Primary / Asst. Examiners: |
Olms, Douglas W.; Hom, Shick
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 16 claims |
What is claimed is:
1. In a communication network for transmitting data frames of multiple types between a source and a destination in the communication network, each data frame type having a different data transmission rate, a method for adapting each transmitted data frame's data transmission rate to a network transmission rate of the communication network, said method comprising the steps of:
- detecting a data frame type from a frame code in a data frame being transmitted from the source to the destination;
- selecting a frame transmission rate for the data frame type detected by said detecting step;
- stretching the data frame being transmitted by inserting a..plurality of null symbols in the data frame being transmitted to produce a stretched data frame with a stretched frame transmission rate matched to the network transmission rate; and
- transmitting the stretched data frame from the source to the destination at the network transmission rate.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 37 U.S. patent(s) that reference this one
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