EP0530680A2
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EP
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ATM cell assembling and disassembling system and method
Assignee: Fujitsu Ltd
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Filing: 1992-08-27
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Granted: —
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Expires: 2012-08-27
Abstract
Abstract In an ATM cell assembling and disassembling method for a communications network having first and second communications nodes (1,21,#1,#n), HDLC data are transferred from a first terminal (28) to the first communications node via a first transmission line (26), the HDLC data conforming to an HDLC format. Assembly, in the first communications node (#1), of at least one cell from the HDLC data starts when data (contained in the HDLC data) equal to one cell have been received. Then the above at least one cell is transferred from the first communications node to the second communications node (#n). Disassembly starts, in the second communications node, of the above at least one cell (to thereby generate original HDLC data) when a fluctuation compensation time has elapsed after a first cell among the above-mentioned at least one cell is received by the second communications node. The fluctuation compensation time is based on a maximum fluctuation time (Amx) of a route connecting the first and second communications nodes to each other, as well as a bit rate of the first transmission line. Finally, the original HDLC data is transferred to a second terminal (29) from the second communications node via a second transmission line (26).
Inventors
- 👤 Tetsuo c/o Fujitsu Limited Nishino
- 👤 Susumu c/o Fujitsu Limited Eda
- 👤 Ryuji c/o Fujitsu Limited Hyodo
- 👤 Katsumi c/o Fujitsu Limited Oomuro
- 👤 Osamu c/o Fujitsu Limited Sekihata
- 👤 Kenji c/o Fujitsu Limited Tanaka
- 👤 Hiroyuki c/o Fujitsu Limited Hatta
- 👤 Reiko c/o Fujitsu Limited Norizuki
- 👤 Nakaba c/o Fujitsu Limited Yuhara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 13:43
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L2012/5638; H04L2012/5646; H04L2012/5652; H04L49/00; H04L49/50; H04L49/501; H04L49/55
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
217 words
An ATM cell assembling and disassembling method for a communications network having first and second communications nodes (1, 21, #1, #n), characterized in that said method comprises the steps of: (a) transferring HDLC data from a first terminal (28) to the first communications node via a first transmission line (26), said HDLC data conforming to an HDLC format; (b) starting to assemble, in the first communications node (#1), at least one cell from said HDLC data when data which is contained in said HDLC data and equal to one cell has been received; (c) successively transferring said at least one cell from the first communications node to the second communications node (#n); and (d) starting to disassemble, in the second communications node (#n), said at least one cell to thereby generate original HDLC data when a fluctuation compensation time has elapsed after a first cell among said at least one cell is received by the second communications node, said fluctuation compensation time being based on a maximum fluctuation time (Amx) of a route connecting the first and second communications nodes to each other as well as a bit rate of said first transmission line; and (e) transferring said original HDLC data to a second terminal (29) from the second communications node via a second transmission line (26).
Claim 2
Dependent Claim
57 words
An ATM cell assembling and disassembling method as claimed in claim 1, characterized in that said step (e) comprises step (d-1) of subtracting a one-cell-transmission time (t) necessary for transferring data equal to one cell via the first transmission line from the maximum fluctuation time, a result of said step (d-1) corresponding to said fluctuation compensation time.
Claim 3
Dependent Claim
39 words
An ATM cell assembling and disassembling method as claimed in claim 1, characterized in that said step (b) comprises step (b-1) of measuring a time equal to one cell after a beginning flag of the HDLC data is received.
Claim 4
Dependent Claim
91 words
An ATM cell assembling and disassembling method as claimed in claim 1, characterized by further comprising the steps of: (f) determining whether or not said at least one cell includes all data contained, as transmission data, in said HDLC data; and (g) immediately starting to disassemble, in the second communications node, said at least one cell to thereby generate original HDLC data without a delay corresponding to said fluctuation compensation time when it is determined by said step (f) that said one cell includes all data contained in said HDLC data.
Claim 5
Dependent Claim
42 words
An ATM cell assembling and disassembling method as claimed in claim 1, characterized in that said step (b) comprises step (b-1) of counting 44 octets in synchronism with a predetermined pulse signal after a beginning flag of the HDLC data is received.
Claim 6
Dependent Claim
242 words
An ATM cell assembling and disassembling system comprising: a first communications node (1, 21, #1); a second communications node (1, 21, #1); and a network (21) coupling said first and second communications nodes to each other, characterized in that said first communications node comprises: first means (3, 4, 5) for assembling at least one cell from HDLC data transferred from a first terminal via a first transmission line, said first means starting to assemble said at least one cell when data which is contained in said HDLC data and equal to one cell has been received, said HDLC data conforming to an HDLC format; and second means (6) for successively transferring said at least one cell from the first communications node to said network, and that said second communications node comprises: third means (9, 10, 11) for disassembling said at least one cell to thereby generate original HDLC data, said second means starting to disassemble said at least one cell when a fluctuation compensation time has elapsed after a first cell among said at least one cell is received by the second means, said fluctuation compensation time being based on a maximum fluctuation time of a route connecting the first and second communications nodes to each other as well as a bit rate of said first transmission line; and fourth means (12) for transferring said original HDLC data to a second terminal from the second communications node via a second transmission line.
Claim 7
Dependent Claim
52 words
An ATM cell assembling and disassembling system as claimed in claim 6, characterized in that third means comprises fifth means for subtracting a one-cell-transmission time necessary for transferring data equal to one cell via the first transmission line from the maximum fluctuation time, a subtraction result corresponding to said fluctuation compensation time.
Claim 8
Dependent Claim
39 words
An ATM cell assembling and disassembling system as claimed in claim 6, characterized in that said second means comprises fifth means for measuring a timer equal to one cell after a beginning flag of the HDLC data is received.
Claim 9
Dependent Claim
88 words
An ATM cell assembling and disassembling system as claimed in claim 6, characterized by further comprising: fifth means for determining whether or not said at least one cell includes all data contained, as transmission data, in said HDLC data; and sixth means for making said third means immediately start to disassemble said at least one cell to thereby generate original HDLC data without a delay corresponding to said fluctuation compensation time when said fifth means determines that said one cell includes all data contained in said HDLC data.
Claim 10
Dependent Claim
42 words
An ATM cell assembling and disassembling system as claimed in claim 6, characterized in that said second means comprises fifth means for counting 44 octets in synchronism with a predetermined pulse signal after a beginning flag of the HDLC data is received.
References Cited (Backward Citations)
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