US5602853A
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US
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Method and apparatus for segmentation and reassembly of ATM packets using only dynamic ram as local memory for the reassembly process
Assignee: Enterasys Networks Inc
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Filing: 1994-11-03
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Granted: 1997-02-11
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Expires: 2014-11-03
Abstract
Abstract An Asynchronous Transfer Mode (ATM) network adapter having a receiver portion, the receiver portion capable of receiving a first plurality of ATM cells and assembling the first plurality of ATM cells into a first plurality of packets, and a transmitter portion, the transmitter receiving a second plurality of packets and segmenting the second plurality of packets into a second plurality of ATM cells, the receiving portion having a local memory for segmentation, while the transmitter portion having no local memory.
Inventors
- 👤 Siman-Tov Ben-Michael
- 👤 Michael Ben-Nun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:29
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5614; H04L2012/5615; H04L2012/5616; H04L2012/5638; H04L2012/5646; H04L2012/5652
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
An Asynchronous Transfer Mode (ATM) adapter for receiving a plurality of ATM cells from a physical interface unit comprising: a packet assembly machine connected to the physical interface unit, the packet assembly machine assembling the plurality of ATM cells into a first packet in only a dynamic random access local memory; a store machine; means, in the packet assembly machine, for signaling the store machine that the first packet is assembled; means, in the store machine, for reading the first packet from the dynamic random access local memory and sending the first packet to a host memory via a system bus interface unit.
Claim 2
Dependent Claim
103 words
An Asynchronous Transfer Mode (ATM) adapter for receiving a plurality of ATM cells from a physical interface unit comprising: a packet assembly machine connected to the physical interface unit, the packet assembly machine assembling the plurality of ATM cells into a first packet in only a dynamic random access local memory; a store machine; means, in the packet assembly machine, for signaling the store machine that the first packet is assembled; means, in the store machine, for reading the first packet from the dynamic random access local memory and sending the first packet to a host memory via a system bus interface unit.
Claim 3
Dependent Claim
174 words
An Asynchronous Transfer Mode (ATM) network adapter comprising: a receiver portion, the receiver portion capable of receiving a first plurality of ATM cells and assembling the first plurality of ATM cells into a first plurality of packets the receiver portion including: a physical interface unit, the physical interface unit capable of receiving the first plurality of ATM cells; a packet assembly machine connected to the physical interface unit, the packet assembly machine assembling the first plurality of ATM cells into a first packet only in a dynamic random access local memory; a store machine; means, in the packet assembly machine, for signaling the store machine that the first packet is assembled; means, in the store machine, for reading the first packet from the dynamic random access local memory and sending the first packet to a host memory via a system bus interface unit; and a transmitter portion, the transmitted portion having a means for receiving a second plurality of packets and segmenting the second plurality of packets into a second plurality of ATM cells.
Claim 4
Dependent Claim
174 words
An Asynchronous Transfer Mode (ATM) network adapter comprising: a receiver portion, the receiver portion capable of receiving a first plurality of ATM cells and assembling the first plurality of ATM cells into a first plurality of packets the receiver portion including: a physical interface unit, the physical interface unit capable of receiving the first plurality of ATM cells; a packet assembly machine connected to the physical interface unit, the packet assembly machine assembling the first plurality of ATM cells into a first packet only in a dynamic random access local memory; a store machine; means, in the packet assembly machine, for signaling the store machine that the first packet is assembled; means, in the store machine, for reading the first packet from the dynamic random access local memory and sending the first packet to a host memory via a system bus interface unit; and a transmitter portion, the transmitted portion having a means for receiving a second plurality of packets and segmenting the second plurality of packets into a second plurality of ATM cells.
Claim 5
Dependent Claim
140 words
The Asynchronous Transfer Mode (ATM) network adapter according to claim 2 wherein the transmitter portion further comprises: a system bus; a system bus interface unit, the system bus receiving the second plurality of packets from the system bus; a transmit DMA prefetch, the transmit DMA prefetch having means for reading the second plurality of packets; a transmit packet memory connected to the transmit DMA fetch, the transmit packet memory having storing means to store a chunk of the second plurality of packets; a transmit FSM connected to the transmit packet memory, the transmit FSM having means for segmenting the chunk of the second plurality of packets into the second plurality of 53-byte ATM long cells; and the transmit FSM having means for sending the second plurality of 53-byte long ATM cells to a PHY chip via a physical interface unit.
Claim 6
Independent Claim
103 words
A method of receiving a plurality of ATM cells from a physical interface unit in an Asynchronous Transfer Mode (ATM) adapter comprising the steps of: providing a packet assembly machine connected to said physical interface unit; assembling said plurality of ATM cells into a first packet in only a dynamic random access local memory of the packet assembly machine; storing said first packet in a store machine; signaling the store machine that the first packet is assembled; reading the first packet from the dynamic random access local memory; and sending the first packet to a host memory via a system bus interface unit.
Claim 7
Independent Claim
103 words
A method of receiving a plurality of ATM cells from a physical interface unit in an Asynchronous Transfer Mode (ATM) adapter comprising the steps of: providing a packet assembly machine connected to said physical interface unit; assembling said plurality of ATM cells into a first packet in only a dynamic random access local memory of the packet assembly machine; storing said first packet in a store machine; signaling the store machine that the first packet is assembled; reading the first packet from the dynamic random access local memory; and sending the first packet to a host memory via a system bus interface unit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |