US4755992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent packet access over d-channel of ISDN
Assignee: Racal Data Communications Inc
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Filing: 1986-06-06
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Granted: 1988-07-05
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Expires: 2006-06-06
Abstract
Abstract An improved method of providing transparent packet access to a D-channel of an ISDN, includes the step of providing a user packet including an Address field, a Control field and an Information field, for transporting to an ISDN; Extracting the Address, Control and Information fields from the the user packet; and inserting the extracted fields into an Information field of an ISDN format LAPD packet. Preferably X.25 packets are provided access to the network, and the X.25 LAPB Address, Control and Information fields are inserted into the LAPD information field. This method provides independence of protocols and reduces complexity.
Inventors
- 👤 Nandakishore A. Albal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:14
CPC Classifications
H; H04; H04L; H04L69/00; H04L12/00; H04L12/28; H04L12/40; H04L12/407; H04L12/417; H04L9/00; H04L9/40; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0435; H04Q11/0457; H04Q2213/00; H04Q2213/174; H04Q2213/296
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A method of providing transparent packet access on a data link layer protocol of an ISDN, comprising the steps of: providing a LAPB user packet including an address field, a control field and an information field, for transporting to an ISDN; extracting said address, control and information fields from said user packet; and inserting said extracted fields into an information field of a single ISDN format LAPD packet.
Claim 2
Independent Claim
68 words
A method of providing transparent packet access on a data link layer protocol of an ISDN, comprising the steps of: providing a LAPB user packet including an address field, a control field and an information field, for transporting to an ISDN; extracting said address, control and information fields from said user packet; and inserting said extracted fields into an information field of a single ISDN format LAPD packet.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein said providing step includes providing an X.25 format LAPB packet.
Claim 4
Dependent Claim
18 words
The method of claim 1, further including the step of providing a LAPB packet to a packet handler.
Claim 5
Dependent Claim
18 words
The method of claim 2, further including the step of providing said LAPB packet to a packet handler.
Claim 6
Dependent Claim
37 words
The method of claim 4, further including the steps of: extracting said information field from said LAPD packet; and appending a LAPB FCS and flags to said LAPD information field to form an X.25 format LAPB packet.
Claim 7
Independent Claim
83 words
A method of providing transparent packet access to a data link layer protocol of an ISDN, comprising the ordered steps of: providing a LAPB user packet in X.25 LAPB format including an address field, a control field and an information field, for transporting to an ISDN; extracting said address, control and information fields from said user packet; inserting said extracted fields into an information field of a single ISDN format LAPD packet; and extracting said LAPD packet information field from said LAPD packet.
Claim 8
Independent Claim
83 words
A method of providing transparent packet access to a data link layer protocol of an ISDN, comprising the ordered steps of: providing a LAPB user packet in X.25 LAPB format including an address field, a control field and an information field, for transporting to an ISDN; extracting said address, control and information fields from said user packet; inserting said extracted fields into an information field of a single ISDN format LAPD packet; and extracting said LAPD packet information field from said LAPD packet.
References Cited (Backward Citations)
US4597074A
Cited
US4607364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |