Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-06-16
2001-09-25
Ngo, Ricky (Department: 2664)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S401000, C370S409000, C370S466000
Reexamination Certificate
active
06295297
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a gateway between networks each using a different communications protocol, and more particularly, to a gateway for connecting an asynchronous transfer mode (ATM)-based access network to an existing circuit public network.
2. Description of the Related Art
The Internet is providing an ever-increasing variety of useful information communication services. However, communication networks have been developing relatively slowly, so that access to the information services has been provided less quickly than expected. In order to solve this problem, establishment of an access network and a high-speed basic network are urgently required. Fortunately, high-speed information communication will be realized sooner or later because of technical developments related to digital subscriber line (hereinafter, called xDSL) technology, cable modems, high-speed wireless networks, satellites, etc. In the term xDSL, when x is A, the A denotes “asymmetric”, and when x is V, the V denotes “very high speed”.
However, a connection between this high-speed basic network or access network and an existing network (e.g., an existing packet network, a PSTN, an ISDN, etc.) has not yet been sufficiently studied.
Referring to
FIG. 1
, a connection of a conventional ATM network
100
to an existing circuit network
110
is performed in an ATM network exchanger. That is, the ATM network exchanger converts a protocol between networks using a specially-installed gateway, so that the ATM network
100
is connected to an existing packet network. Also, internally or externally installed in the ATM network exchanger is a device for emulating a circuit using an ATM adaptive layer (AAL-
1
) to connect the ATM network
100
to the existing circuit network
110
. In
FIG. 1
, NSP denotes a network service provider, LT denotes line termination, NT denotes network termination, UNI denotes a user network interface, and ANI denotes an access network interface.
The above-described conventional connection is suitable when the number of subscribers connected to the ATM network is small. However, an increase in the number of subscribers due to the spread of the access network in the near future may overload protocol conversion to be made by a gateway unit. Also, when all the existing telephone network subscribers connect at once to the circuit network via the ATM network, the ATM network exchanger is overloaded, which makes highspeed information communications impossible.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a gateway for connecting an ATM-based access network to an existing circuit network, to aid high-speed information communications by reducing the load applied to an ATM network exchanger during connection of the ATM network to the existing network, when a superspeed information communication network is constructed on the basis of ATM in the future.
Accordingly, to achieve the above objective, there is provided a gateway for connecting an existing circuit network to an asynchronous transfer mode (ATM)-based access network which connects a subscriber and a basic network, comprising: an ATM network connector for performing signal processing to send or receive a signal via a broadband ATM network and controlling the signal processing; an existing circuit network connector for processing a signal to send or receive the signal via an existing circuit network, reciprocally converting between the signal transmitted via the existing circuit network and an ATM cell, and controlling the signal processing and the conversion; a plurality of line terminations for sending or receiving a signal by connecting to a remote user, converting between the signal from the user and the ATM cell, and controlling the sending, reception and conversion; and a system bus for transmitting a signal between the plurality of line terminations and the ATM and existing circuit network connectors.
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Ngo Ricky
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Tran Phuc
LandOfFree
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