Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1997-11-04
2001-06-05
Olms, Douglas (Department: 2661)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S401000, C370S503000, C370S905000, C370S395430, C375S354000
Reexamination Certificate
active
06243395
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention generally relates to an ATM cell transferring method and an ATM cell transferring apparatus. More specifically, the present invention is directed to data communication techniques capable of transferring ATM (Asynchronous Transfer Mode) data via a highspeed serial data bus standardized by IEEE 1394.
Recently, communication systems have been proposed in which various electronic appliances such as personal computers, digital video cameras, digital tuners, and hard disk units are electrically connected to each other by employing a highspeed serial data bus standardized by IEEE 1394 (will be referred to as a “1394-serial data bus” hereinafter) so as to communicate digital picture/image signals, digital audio/voice signals, and the like among these electronic appliances. In the above-described data communication systems, since the respective electronic appliances are connected to each other via the cables defined in IEEE 1394 (will be referred to as “1394-cables” hereinafter), the digital image signals and the digital audio signals can be communicated among these electronic appliances. Furthermore, all of these electronic appliances can be controlled in total sense.
On the other hand, ATM (Asynchonous Transfer Mode) is used in networks, e.g., a personal computer LAN (Local Area Network) and a B-ISDN (Broadband Integrated Service Digital Network). It should be noted that this ATM corresponds to such a format defined by ITU-T (International Telecommunication Union-Telecommunication). A packet (normally, called as a “cell”) used in an ATM system owns a fixed length of 53 bytes, as illustrated in
FIG. 1A
, which is constructed of a 5-bite ATM cell header, and a 48-byte payload subsequent to this ATM cell header. Then, the 5-byte cell header owns such a structure as shown in FIG.
1
B. Since no synchronous relationship is required between a phase of a frame and a position of a cell, and/or between positions of cells within an ATM network, this ATM system is suitably used to constitute networks where data having various bite rates are communicated in mixture manners. Under such circumstances, strong needs are made of establishing a networks with satisfying both the merits of the abovedescribed communication system and ATM system.
SUMMARY OF THE INVENTION
The present invention has been made by considering the above-explained strong needs, and therefore, has an object to provide data transferring method/apparatus capable of transferring an ATM cell via the 1394-serial data bus.
To achieve the above-described object, an ATM cell transferring method, according to an aspect of the present invention, is featured by that a data transferring method for transferring data by employing a serial bus standardized by the IEEE 1394 format, wherein: a predetermined header is added to an ATM cell used in a network defined by the ATM system in such a manner that the ATM cell is transferred by using the structure of the isochronous packet defined by the IEEE 1394 format.
Also, an ATM cell transferring apparatus, according to another aspect of the present invention, is featured that in a data transferring apparatus for transferring data by employing a serial bus standardized by the IEEE 1394 format, an ATM cell transferring apparatus is comprised of: an adding circuit for adding a predetermined header in order that an ATM cell used in a network defined by the ATM system is stored into the data field of the isochronous packet defined by the IEEE 1394 format.
In accordance with the present invention, the ATM cell can be entered into the isochronous packet defined by IEEE 1394, and then can be sent out to the 1394-serial data bus.
REFERENCES:
patent: 5745837 (1998-04-01), Fuhrmann
patent: 5808660 (1998-09-01), Sekine et al.
patent: 5847771 (1998-12-01), Cloutier et al.
patent: 5933430 (1999-08-01), Osakabe et al.
patent: 5995511 (1999-11-01), Zhou et al.
Fujimori Takahiro
Sato Makoto
Tanaka Tomoko
Frommer William S.
Frommer Lawrence & Haug LLP.
Hom Shick
Olms Douglas
Polito Bruno
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