WO2002076027A1 - Adsl access multiplexer connected to ethernet and adsl network system using the same - Google Patents

Adsl access multiplexer connected to ethernet and adsl network system using the same Download PDF

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Publication number
WO2002076027A1
WO2002076027A1 PCT/KR2001/002029 KR0102029W WO02076027A1 WO 2002076027 A1 WO2002076027 A1 WO 2002076027A1 KR 0102029 W KR0102029 W KR 0102029W WO 02076027 A1 WO02076027 A1 WO 02076027A1
Authority
WO
WIPO (PCT)
Prior art keywords
adsl
signal
layer
atm
ethernet
Prior art date
Application number
PCT/KR2001/002029
Other languages
French (fr)
Inventor
Myoung Su Lee
Cheol Ho Ji
Original Assignee
Corecess Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020010014727A external-priority patent/KR100344699B1/en
Application filed by Corecess Inc. filed Critical Corecess Inc.
Priority to BR0110951-0A priority Critical patent/BR0110951A/en
Priority to CA002407266A priority patent/CA2407266A1/en
Priority to MXPA02011354A priority patent/MXPA02011354A/en
Priority to EP01274002A priority patent/EP1382156A4/en
Publication of WO2002076027A1 publication Critical patent/WO2002076027A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/04Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478Provisions for broadband connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854Wide area networks, e.g. public data networks
    • H04L12/2856Access arrangements, e.g. Internet access
    • H04L12/2869Operational details of access network equipments
    • H04L12/2898Subscriber equipments
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00Network architectures or network communication protocols for network security
    • H04L63/08Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0892Network architectures or network communication protocols for network security for authentication of entities by using authentication-authorization-accounting [AAA] servers or protocols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems 
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • H04L2012/5603Access techniques
    • H04L2012/5609Topology
    • H04L2012/561Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems 
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • H04L2012/5638Services, e.g. multimedia, GOS, QOS
    • H04L2012/5665Interaction of ATM with other protocols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00Network architectures or network communication protocols for network security
    • H04L63/08Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/083Network architectures or network communication protocols for network security for authentication of entities using passwords

Definitions

  • the present invention relates to an asymmetric digital subscriber line
  • ADSL ADSL
  • ADSL ADSL
  • LAN local area network
  • the invention involves an ADSL network system consisting of the
  • ADSL access multiplexer which can decentralize the traffic in a high speed
  • a telephone modem is used to transmit digital data generated by a telephone modem.
  • POTS plain old telephone service
  • modem supplies data transmission rates up to 56 kilobits per second (Kbps),
  • the digital data is transmitted and received with higher
  • the customer can receive multimedia services at high speed through digital data
  • the ADSL standard provides downstream data rates up to 8 Megabits per
  • Fig. 1 is a block diagram showing an ADSL architecture consisting of a
  • NAS network access server
  • ATM asynchronous transfer mode
  • Fig. 1 comprises a customer terminal part 10, a DSL access multiplexer
  • DSLAM digital subscriber identity management
  • NAS network access server
  • ATU-R ADSL terminal unit-remote
  • ADSL terminal unit-central office (ATU-C) 22 as an ADSL terminal unit-central office
  • the customer terminal part 10 includes a customer splitter 11 ,
  • ATU-R 12 ATU-R 12
  • customer terminal 13 ATU-R 14
  • telephone 14 The customer splitter 11
  • ADSL signal and a telephone signal for POTS.
  • the ADSL signal is forwarded to
  • ATU-R 12 and the telephone signal for POTS is sent to the telephone 14. Then,
  • the ADSL signal is demodulated into digital data by ATU-R 12 and sent to the
  • ATU-R 12 modulated through ATU-R 12 and transmitted to a DSL access multiplexer
  • NAS network access server
  • the DSLAM 20 includes a
  • ATU-C ADSL terminal unit-central office
  • the central office splitter 21 splits the telephone signals
  • the telephone signal for POTS is transmitted to public
  • PSTN public switched telephone network
  • the ADSL signal is forwarded to the core network 2 through ATU-C 22 and the
  • the NAS 30 performs the necessary steps to authenticate dial-in users
  • router 40 couples the DSLAM 20 to the Internet 3. Further, the NAS 30 is coupled
  • the base ADSL architecture is configured in a manner
  • At least one NAS 30 is necessarily installed and
  • one NAS 30 is coupled to a plurality of DSLAMs 20 established in corresponding
  • multimedia services such as video on demand (VOD), multimedia conference,
  • the present invention is directed to an ADSL access multiplexer connected to Ethernet that substantially obviates one or more of the ADSL access multiplexer connected to Ethernet that substantially obviates one or more of the ADSL access multiplexer connected to Ethernet that substantially obviates one or more of the ADSL access multiplexer connected to Ethernet that substantially obviates one or more of the ADSL access multiplexer connected to Ethernet that substantially obviates one or more of the
  • An object of the present invention is to provide an ADSL access multiplexer
  • Another object of the present invention is to provide an ADSL network
  • an ADSL access multiplexer which connects a
  • a storing part including a predetermined
  • connection mode support program supporting point-to-point (PPP) connection
  • IP protocol
  • Ethernet interface part for executing a segmentation process for converting the
  • connection mode based on the connection mode support program and the IP pool.
  • the PPP mode is a PPP over ATM (PPPoA), the storing part further
  • the PPP mode is a PPP over Ethernet (PPPoE), an ATM
  • interface part is further included, and the central processing part processes
  • the storing part further includes a predetermined remote
  • RADIUS authentication dial-in user service
  • RADIUS server through the Internet transmits the subscriber information including
  • an ADSL network system comprising in sequence: at
  • At least a customer terminal part connected to Internet in a point-to-point over ATM
  • IP Internet protocol
  • ADSL ADSL layer
  • the layer is based on the IP layer and the physical layer is the Ethernet layer; at least
  • an Ethernet switch connected to the ADSL access multiplexer, for executing
  • the IP layer is based on the IP layer and the physical layer is a core network layer; and at
  • At least a router positioned between the Ethernet switch and the Internet, for routing
  • the plural ADSL access multiplexers are coupled to the Ethernet switch
  • Fig. 1 is a block diagram of a basic ADSL architecture using a conventional
  • Fig. 2 is a block diagram illustrating a basic concept of an ADSL access
  • Fig. 3 is a block diagram of an ADSL access multiplexer in Fig. 2 in
  • Fig. 4 is a block diagram of an ADSL access multiplexer in Fig. 2 in
  • Fig. 5 is a block diagram showing an ADSL network system using the
  • ADSL access multiplexer in Fig. 3 in accordance with a first aspect of the present invention
  • Fig. 6 depicts a protocol layer of a digital signal processed in the ADSL
  • Fig. 7 is a block diagram showing an ADSL network system using the
  • ADSL access multiplexer in Fig. 3 in accordance with a second aspect of the
  • Fig. 8 denotes a protocol layer of a digital signal processed in the ADSL
  • Fig. 9 a block diagram showing a brief configuration of a common RADIUS
  • ADSL ADSL
  • FIG. 2 An ADSL access multiplexer
  • Ethernet frame signal and forwards the converted signal to the outside.
  • the ADSL access multiplexer converts an Ethernet frame signal input from the outside into an ADSL signal and transmits the converted signal to the customer
  • the ADSL access multiplexer 50 comprises an ADSL interface part 51 , an ADSL
  • the ADSL interface part 51 transmits an
  • ADSL signal/ATM cell signal converting part 52 forwards the ADSL signal
  • ADSL signal/ATM cell signal converting part 52 encapsulated by the ADSL signal/ATM cell signal converting part 52 to the twisted
  • ADSL modulation methods is classified into discrete multitone (DMT) and
  • part 52 includes a plurality of G.dmt analog front ends 522 coupled to the ADSL
  • the G.dmt analog front end 522 is a
  • the G.dmt digital processor 521 is a coder/decoder (CODEC) executing analog-to-digital conversion and digital-to- analog conversion for the ADSL signal.
  • CDEC coder/decoder
  • the G.dmt one of the DMT
  • part 52 is configured in a manner that three G.dmt digital processors 521 is
  • each G.dmt digital processor 521 accommodates four
  • the ADSL signal/ATM cell signal converting part 52 The ADSL signal/ATM cell signal converting part 52.
  • an ATM bus BS 55 by an ATM bus BS.
  • the ATM bus BS is controlled by an ATM
  • bus controller not depicted, and the detailed description will be omitted.
  • the ADSL signal/ATM cell signal the ADSL signal/ATM cell signal
  • converting part 52 is configured to apply the G.dmt modulation method, however,
  • G.lite one of the DMT modulation methods, can be applied to.
  • the G.lite one of the DMT modulation methods, can be applied to.
  • modulation method provides downstream data rates up to 1.5 Mbps and upstream
  • the Ethernet interface part 53 forwards the Ethernet frame signal
  • Ethernet frame signal input from the Ethernet to the central processing part 55, thus executing connection to the Ethernet and transmission of the Ethernet frame
  • the Ethernet interface part 53 includes a 10/100 Base-T Ethernet socket
  • Ethernet socket 531 and the Ethernet are connected
  • the storing part 54 includes a RAM 541 , a BIOS 542 and a program
  • the RAM 541 loads various temporary data
  • the program stores various initial data required when booting the system.
  • the program storing
  • part 543 consists of a basic operation program, an IP pool provided when
  • connection mode support program for point-to-point mode (PPP), described below,
  • Ethernet frame signal (Reassembly) and converting the Ethernet frame signal into
  • the PPP mode is generally classified into PPP over ATM (PPPoA) mode
  • PPPoA PPP over Ethernet
  • VPN virtual private network
  • connection mode is for executing the PPP connection on the Ethernet.
  • the connection mode support program is for the PPPoA mode, especially.
  • the ADSL access multiplexer 50 in accordance with the present
  • the connecting mode support program executes routing a
  • connection mode it is possible to configure the connection mode
  • NAT NAT function for connecting to an external network with public IPs given.
  • multiplexer 50 of the invention can be coupled to the NAS 30 in Fig. 1 by means of an ATM TO Ethernet switch connecting the ATM network and the Ethernet, it is
  • access multiplexer 50 doesn't execute the routing operation, but processes a
  • AAL5 denotes ATM adaptation layer and SAR stands for
  • the central processing part 55 includes an universal
  • test operation PHY interface for ATM (UTOPIA) interface 551 a peripheral
  • PCI component interface
  • CPU/ATM controller 553 connected
  • the UTOPIA interface 441 provides an
  • the PCI 552 provides an interface
  • CPU/ATM controller 553 controls the overall system and processes ADSL
  • the CPU/ATM controller 553 converts the ATM cell signal transmitted by
  • plural twisted pair wires 1 includes an ADSL signal and a telephone signal for
  • the ADSL signal is input to the ADSL access multiplexer 50 through
  • part 55 refers the subscriber's ID and password transmitted from the subscriber to
  • the central processing part 55 reassembles the ATM cell signal
  • Ethernet frame signal and executes the collecting and routing processes for the
  • UTOPIA interface 551 is reassembled to be the Ethernet frame signal by the
  • the segmentation process converting the Ethernet frame signal into the ATM cell signal is executed when transmitting data from the
  • Ethernet to the customer premises.
  • protocol process such as
  • IP Internet protocol
  • the NAT function is for making most use
  • ADSL access multiplexer 50 is set to
  • the bridge mode including the assignment of IP using the IP
  • DHCP configuration protocol
  • CPU/ATM controller 553 of Fig. 3 is transmitted to the Ethernet by way of the PCI
  • access multiplexer 50 supports twelve subscribers, i.e., twelve ports basically,
  • the ADSL services including VOD service using the ADSL access
  • multiplexer 50 in Fig. 3 based on the local network can be provided by adding a
  • predetermined RADIUS client program for executing the processes of
  • the RADIUS is a client/server protocol
  • FIG. 4 showing a block diagram of an ADSL access
  • An additional ATM interface part 56 is provided, attached to the ATM bus
  • the ATM interface part 56 supports
  • the ATM25 interface for example. Accordingly, it is possible to connect to the NAS
  • the program storing part 571 further includes a predetermined protocol
  • connection mode support
  • the ADSL network system comprises a customer terminal part 10, an
  • ADSL access multiplexer 50 an Ethernet switch 60 and a router 40, wherein the
  • ADSL access multiplexer 50 is operated in the PPPoA mode.
  • customer terminal part 10 is connected to the ADSL access multiplexer 50, and at
  • At least one ADSL access multiplexer 50 is coupled to the Ethernet switch 60 in
  • the one ADSL access multiplexer 50 accommodating a small scale of
  • Ethernet switch 60 Besides, a plurality of ADSL access multiplexers 50 are linked
  • Ethernet switch 60 so as to configure a single network, and a plurality of
  • customer terminal parts 10 connected to the ADSL access multiplexer 50 are interconnected to each other, thus connecting and disconnecting the ADSL access multiplexer 50
  • the Ethernet switch 60 coupling an Ethernet to another Ethernet
  • the object of the ADSL network system in Fig. 5 is to solve the
  • IP stands for the Internet protocol by which data is
  • PPP is a protocol for
  • AAL5 denoting an
  • ATM adaptation layer is a connection-oriented protocol having variable
  • ADSL defines a physical layer for transmitting data.
  • the customer terminal part 10 is connected to the ADSL access
  • the multiplexer 50 in PPPoA mode, whereby the transmitted ADSL signal has a multi- layer structure of IP, PPP, PPPoA, AAL5, SAR, ATM and ADSL downwardly.
  • the data-link layer is based on the ATM layer and the physical layer is the ADSL
  • CPU/ATM controller 553 of the ADSL access multiplexer 50 in Fig. 3 processes
  • the Ethernet switch 60 in Fig. 6 converts all layers of the Ethernet frame
  • the physical layer applies one of the core networks, such as STM-1 ,
  • FIG. 3 in accordance with another embodiment of the invention is shown in Fig. 7, identical components with reference to Fig. 1 are indicated by
  • the ADSL network system in Fig. 7 comprises a customer terminal part 10,
  • an ADSL access multiplexer 50 an ATM TO Ethernet switch 70, a NAS 30 and a
  • the ATM TO Ethernet switch 70 transmits the Ethernet frame
  • the ATM TO signal through the ATM network, such as STM-1 for example.
  • the ATM TO is a signal through the ATM network, such as STM-1 for example.
  • the ATM TO is a signal through the ATM network, such as STM-1 for example.
  • Ethernet switch 70 for coupling the Ethernet to the ATM line is obvious to the
  • ADSL access multiplexer 50 is coupled to the NAS 30, a plurality of ADSL access
  • multiplexers 50 are coupled to the NAS 30 through the ATM TO Ethernet switch
  • PVC circuit
  • the PVC is a software-defined logical
  • connection in a network which defines logical connections and required
  • customer terminal part 10 and the NAS 30, and the NAS 30 should authenticate all the dial-in subscribers and authorize their access to the requested system or
  • the ADSL signal processed by the customer terminal part 10 in Fig. 8 has
  • Ethernet layer and transmitted to the ATM TO Ethernet switch 70 as the Ethernet
  • the multi-layer structure described above makes the ADSL access
  • multiplexer 50 to be operated in the bridge mode, thus connecting the ADSL
  • FIG. 9 a block diagram showing a brief configuration of a
  • a RADIUS system of Fig. 9 comprises a customer terminal part 10, an
  • ADSL access multiplexer 90 an Ethernet switch 60, a router 40 and a RADIUS
  • multiplexer 90 is configured by establishing a predetermined RADIUS client
  • client program transmits a predetermined subscriber information to the RADIUS
  • subscriber information includes subscriber's ID, password, IP address, port
  • the traffic can be decentralized to the respective local
  • ADSL lines direct to existing Ethernet, and prevent the traffic centralization.
  • multimedia services such as video on demand (VOD), multimedia conference,

Abstract

Disclosed relates to an asymmetric digital subscriber line (ADSL) access multiplexer connected direct to existing Ethernet and an ADSL network system using ASDL access multiplexer. The ADSL network system excludes a conventional network access server (NAS) and connects the ADSL access multiplexer direct to the Ethernet, thus decentralizing the processes for authentication, imposition of charge and traffic to a corresponding local network. Accordingly, the problem of traffic centralization raised by the conventional NAS is solved readily. Besides, the ADSL access multiplexer according to the invention further includes a remote authentication dial-in user service (RADIUS) client program, whereby the processes for authentication and imposition of charge are made very easily.

Description

ADSL ACCESS MULTIPLEXER CONNECTED TO ETHERNET AND ADSL NETWORK SYSTEM USING THE SAME
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an asymmetric digital subscriber line
(ADSL) and, more particularly, to an ADSL access multiplexer connected direct to
existing Ethernet which can reduce the traffic burden, configure the local area
network (LAN) , and facilitate the management of subscribers in the LAN.
Furthermore, the invention involves an ADSL network system consisting of the
ADSL access multiplexer which can decentralize the traffic in a high speed
communications network.
2. Description of the Related Art
The rapid growth of the information communications on the Internet has
created the need for high-speed, low-cost techniques for transmitting data to and
from homes, small businesses, schools and the like. A primary method applied
commonly to transmitting and receiving digital data involves the use of telephone
modems. A telephone modem is used to transmit digital data generated by a
computer to an intended destination over standard telephone lines. This setup
enables computers to gain access to the Internet and other on-line services over
standard telephone jacks. Although this form of communications is convenient, it is painfully slow because telephone lines simply consist of twisted pair wires that
support "plain old telephone service" (POTS). That is, the conventional telephone
modem supplies data transmission rates up to 56 kilobits per second (Kbps),
which cannot accommodate smoothly multimedia services such as multimedia
conference, video on demand (VOD) and the like. Accordingly, a desired method
for providing the multimedia services perfectly is to establish an optical fiber cable
network up to customer premises. However, to establish the same network to all
the customers expected is time-consuming and entails enormous expenses.
Accordingly, an ADSL standard using the conventional twisted pair wires
has been developed to provide multimedia services economically. According to
the ADSL standard, digital data can be transmitted and received through twisted
pair wires for POTS. The digital data is transmitted and received with higher
bandwidth than analog frequency bandwidth for telephone services. Consequently,
the customer can receive multimedia services at high speed through digital data
transmission, as well as common telephone services.
The ADSL standard provides downstream data rates up to 8 Megabits per
second (Mbps) from the central office to the customer while providing upstream
data rates from the customer premises to the central office up to 640 Kbps. This
asymmetric relationship between downstream and upstream data rates matches
the original intent of ADSL to provide high bandwidth multimedia services
downstream with more limited bandwidth requirements upstream from the
customer premises. Fig. 1 is a block diagram showing an ADSL architecture consisting of a
conventional network access server (NAS), which is configured based on
asynchronous transfer mode (ATM) network. The conventional ADSL network
system in Fig. 1 comprises a customer terminal part 10, a DSL access multiplexer
(DSLAM) 20 and a network access server (NAS) 30. The basic ADSL architecture
includes an ADSL terminal unit-remote (ATU-R) 12 as an ADSL interface unit at
the customer premise, and an ADSL terminal unit-central office (ATU-C) 22 as an
ADSL interface at the telephone company central office, which are interconnected
by a twisted pair wire 1 for POTS through a customer splitter 11 and a central
office splitter 21. The customer terminal part 10 includes a customer splitter 11 ,
ATU-R 12, a customer terminal 13 and a telephone 14. The customer splitter 11
splits the telephone signals transmitted from the twisted pair wire 1 to separate an
ADSL signal and a telephone signal for POTS. The ADSL signal is forwarded to
ATU-R 12 and the telephone signal for POTS is sent to the telephone 14. Then,
the ADSL signal is demodulated into digital data by ATU-R 12 and sent to the
customer terminal 13. The digital data of the customer terminal 13 is then
modulated through ATU-R 12 and transmitted to a DSL access multiplexer
(DSLAM) 20, described hereinafter.
DSLAM 20 in Fig. 1 established between the customer terminal part 10 and
a network access server (NAS) 30, described hereinafter, executes collecting and
routing of traffic for scores or hundreds of subscribers. The DSLAM 20 includes a
central office splitter 21 , an ADSL terminal unit-central office (ATU-C) 22, provided as much as the number of subscribers, as an ADSL interface at the customer
premise, and a network interface 23 for communicating with a core network 2,
such as ATM network. The central office splitter 21 splits the telephone signals
transmitted from the twisted pair wire 1 to separate an ADSL signal and a
telephone signal for POTS. The telephone signal for POTS is transmitted to public
telephone networks, such as the public switched telephone network (PSTN), and
the ADSL signal is forwarded to the core network 2 through ATU-C 22 and the
network interface 23.
The NAS 30 performs the necessary steps to authenticate dial-in users
and authorize their access to the requested system or service, usually by verifying
the user ID and password, and to process the traffic according to data
transmission. That is, the NAS 30, located between the core network 2 and a
router 40, couples the DSLAM 20 to the Internet 3. Further, the NAS 30 is coupled
to a plurality of DSLAMs 20 established at corresponding area, not depicted in Fig.
1 .
As described above, the base ADSL architecture is configured in a manner
that the DSLAM 20 established at the telephone company central office can
accommodate two hundred subscribers approximately and has the ATU-C 22 as
much as the number of subscribers, which needs high installation costs. Besides,
if a user wants to subscribe ADSL service, there must be established the DSLAM
20 at corresponding telephone office. Repeatedly, if a telephone office cannot
afford install the expensive DSLAM 20 designed for accommodating two hundred subscribers, users within its jurisdiction cannot use the ADSL service. Moreover, it
is inhibitive to install the expensive DSLAMs 20 in every telephone offices, which
disturbs the spread of the ADSL service. Furthermore, according to the
conventional ADSL architecture, at least one NAS 30 is necessarily installed and
one NAS 30 is coupled to a plurality of DSLAMs 20 established in corresponding
area. That is, since the NAS 30 should accommodate hundreds to thousands of
subscribers connected with the plural DSLAMs 20, the traffic burden to be
processed is increased geometrically according to increasing of the number of
subscribers, thus deteriorating data transmission rates and quality of service.
Additionally, since the authentication and routing processes for the respective
subscribers are executed by the NAS 30, the various services such as data
communications among the subscribers based on the local network are not
provided smoothly. Meanwhile, in consideration of expected rapid spread of the
multimedia services such as video on demand (VOD), multimedia conference,
local Internet broadcasting and the like, there is raised serious drawbacks in
authorizing and imposing charges for hundreds to thousands of subscribers
through the NAS 30. Consequently, it is desired to provide a system for
authentication and imposition based on the local network instead of the
conventional ADSL architecture using the NAS 30, if possible.
BRIEF SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to an ADSL access multiplexer connected to Ethernet that substantially obviates one or more of the
problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide an ADSL access multiplexer
connected to Ethernet which can exclude the conventional NAS equipment when
configuring the ADSL network system by connecting the ADSL lines direct to
existing Ethernet, and prevent the traffic centralization, accordingly.
Another object of the present invention is to provide an ADSL network
system which can decentralize the traffic to be processed on the Internet using
the same ADSL access multiplexer.
To accomplish an object in accordance with a first aspect of the present
invention, there is provided an ADSL access multiplexer which connects a
plurality of ADSL lines, through which an ADSL signal having a multi-layer
structure including an application layer, a link layer and a physical layer is
transmitted, to an Ethernet, through which an Ethernet frame signal including an
application layer and an Ethernet layer is transmitted, comprising: an ADSL
interface part connected to the ADSL lines; an ADSL signal/ATM cell signal
converting part, coupled to the ADSL interface part, for executing signal
conversions between the ADSL signal and asynchronous transfer mode (ATM)
cell signal; an Ethernet interface part executing connection to the Ethernet and
transmission of the Ethernet frame signal; a storing part including a predetermined
connection mode support program supporting point-to-point (PPP) connection
mode, a predetermined protocol process program for the ATM cell signal, a subscriber information required when connecting communications, and an Internet
protocol (IP) pool assigned to a subscriber; and a central processing part,
positioned between the ADSL signal/ATM cell signal converting part and the
Ethernet interface part, for executing a segmentation process for converting the
ATM cell signal into the Ethernet frame signal in upstream channels and a
reassembly process for converting the Ethernet frame signal into the ATM cell
signal in downstream channels based on the protocol process program stored in
the storing part, and for assigning IP to the subscriber when connecting the PPP
mode based on the connection mode support program and the IP pool.
To accomplish another object in accordance with the first aspect of the
invention, the PPP mode is a PPP over ATM (PPPoA), the storing part further
includes an IP table for the routing process, and the central processing part
executes the routing process for a subscriber's source/destination IP based on
the IP table.
To accomplish another object in accordance with the first aspect of the
present invention, the PPP mode is a PPP over Ethernet (PPPoE), an ATM
interface part is further included, and the central processing part processes
communication protocols between the ATM cell signal transmitted and received
through the ATM interface part and the ADSL signal transmitted and received
through the ADSL interface part, based on the connection mode support program
and the protocol process program.
To accomplish another object in accordance with the first aspect of the present invention, the storing part further includes a predetermined remote
authentication dial-in user service (RADIUS) client program for processes of
authentication and imposition, and the central processing part connected to a
RADIUS server through the Internet transmits the subscriber information including
subscriber's ID, password, IP address, port number, log-in time, log-out time and
packet amount, based on the RADIUS client program.
To accomplish another object in accordance with a second aspect of the
invention, there is provided an ADSL network system comprising in sequence: at
least a customer terminal part, connected to Internet in a point-to-point over ATM
(PPPoA) mode, for processing an ADSL signal of which an application layer is
based on an Internet protocol (IP) and a physical layer is an ADSL layer; at least
an ADSL access multiplexer, connected to the customer terminal part and
operated in a point-to-point over ATM mode, for executing signal conversions
between the ADSL signal and an Ethernet frame signal of which the application
layer is based on the IP layer and the physical layer is the Ethernet layer; at least
an Ethernet switch, connected to the ADSL access multiplexer, for executing
signal switching between the Ethernet frame signal and an external signal,
transmitted to and from the Internet through a router, of which the application layer
is based on the IP layer and the physical layer is a core network layer; and at
least a router, positioned between the Ethernet switch and the Internet, for routing
a subscriber's source/destination IP.
To accomplish another object in accordance with the second aspect of the invention, the plural ADSL access multiplexers are coupled to the Ethernet switch,
thus configuring a single local network.
It is to be understood that both the foregoing general description and the
following detailed description are exemplary and explanatory and are intended to
provide further explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and constitute a part of this
specification, illustrate embodiments of the invention and together with the
description serve to explain the principles of the invention:
In the drawings:
Fig. 1 is a block diagram of a basic ADSL architecture using a conventional
NAS;
Fig. 2 is a block diagram illustrating a basic concept of an ADSL access
multiplexer in accordance with the present invention;
Fig. 3 is a block diagram of an ADSL access multiplexer in Fig. 2 in
accordance with an embodiment of the invention;
Fig. 4 is a block diagram of an ADSL access multiplexer in Fig. 2 in
accordance with another embodiment of the invention;
Fig. 5 is a block diagram showing an ADSL network system using the
ADSL access multiplexer in Fig. 3 in accordance with a first aspect of the present invention;
Fig. 6 depicts a protocol layer of a digital signal processed in the ADSL
network system in Fig. 5;
Fig. 7 is a block diagram showing an ADSL network system using the
ADSL access multiplexer in Fig. 3 in accordance with a second aspect of the
present invention;
Fig. 8 denotes a protocol layer of a digital signal processed in the ADSL
network system in Fig. 7; and
Fig. 9 a block diagram showing a brief configuration of a common RADIUS
system for illustrating functions of authentication and imposition by the ADSL
access multiplexer in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Reference will now be made in detail to the preferred embodiments of the
present invention, examples of which are illustrated in the accompanying
drawings.
A block diagram illustrating a basic concept of an ADSL access multiplexer
in accordance with the invention is shown in Fig. 2. An ADSL access multiplexer
50 for accommodating a small scale of twelve subscribers, for example, converts
an ADSL signal transmitted from the customer terminal part 10 in Fig. 1 into an
Ethernet frame signal and forwards the converted signal to the outside. Besides,
the ADSL access multiplexer converts an Ethernet frame signal input from the outside into an ADSL signal and transmits the converted signal to the customer
terminal part 10.
A block diagram showing an internal architecture of the ADSL access
multiplexer in accordance with an embodiment of the invention is shown in Fig. 3.
The ADSL access multiplexer 50 comprises an ADSL interface part 51 , an ADSL
signal/ATM cell signal converting part 52, an Ethernet interface part 53, a storing
part 54 and a central processing part 55. The ADSL interface part 51 transmits an
ADSL signal input from a plurality of twisted pair wires 1 , not depicted, to the
ADSL signal/ATM cell signal converting part 52, and forwards the ADSL signal
encapsulated by the ADSL signal/ATM cell signal converting part 52 to the twisted
pair wires 1 , vice versa. That is, the ADSL signal/ATM cell signal converting part
52 demodulates the ADSL signal input from the ADSL interface part 51 to
decapsulate only the ADSL layer, and modulates the ATM cell signal transmitted
from a central processing part 55, described below, to be encapsulated. The
ADSL modulation methods is classified into discrete multitone (DMT) and
carrierless AM/PM (CAP). DMT that divides a given channel into plural sub¬
channels and transmits data corresponding to each characteristic of the sub¬
channels is being widely applied to. The ADSL signal/ATM cell signal converting
part 52 includes a plurality of G.dmt analog front ends 522 coupled to the ADSL
interface part 51 and a plurality of G.dmt digital processors 521 connected to the
G.dmt analog front ends 522 respectively. The G.dmt analog front end 522 is a
coder/decoder (CODEC) executing analog-to-digital conversion and digital-to- analog conversion for the ADSL signal. The G.dmt digital processor 521 is a
modem for the ADSL modulation and demodulation. The G.dmt, one of the DMT
modulation methods, controls the ADSL signal frequency bandwidths and the
transmission rates and provides downstream data rates up to 8 Mbps and
upstream data rates up to 1 Mbps. The ADSL signal/ATM cell signal converting
part 52 is configured in a manner that three G.dmt digital processors 521 is
established therein and each G.dmt digital processor 521 accommodates four
subscribers, thus processing the ADSL signal modulation/demodulation for twelve
subscribers. Besides, it is possible to increase the number of subscribers to be
accommodated by adding the G.dmt digital processor 521 and the G.dmt analog
front end 522 to the ADSL signal/ATM cell signal converting part 52. The ADSL
signal/ATM cell signal converting part 52 is coupled to a central processing part
55 by an ATM bus BS. As well known, the ATM bus BS is controlled by an ATM
bus controller, not depicted, and the detailed description will be omitted.
According to the above configuration, the ADSL signal/ATM cell signal
converting part 52 is configured to apply the G.dmt modulation method, however,
G.lite, one of the DMT modulation methods, can be applied to. The G.lite
modulation method provides downstream data rates up to 1.5 Mbps and upstream
data rates up to 512 Kbps, which is adapted to an economic ADSL service.
The Ethernet interface part 53 forwards the Ethernet frame signal
transmitted from the central processing part 55 to the Ethernet and transmits the
Ethernet frame signal input from the Ethernet to the central processing part 55, thus executing connection to the Ethernet and transmission of the Ethernet frame
signal. The Ethernet interface part 53 includes a 10/100 Base-T Ethernet socket
531 and a 10/100 Base-T interface 532 intermediating between the 10/100 base-T
Ethernet socket 531 and the Ethernet.
The storing part 54 includes a RAM 541 , a BIOS 542 and a program
storing part 543, which are coupled to a CPU/ATM controller 553 of the central
processing part 55, described below. The RAM 541 loads various temporary data
generated by the central processing part 55 and driving programs. The BIOS 542
stores various initial data required when booting the system. The program storing
part 543 consists of a basic operation program, an IP pool provided when
connecting subscribers, an IP table for routing, subscribers' information, such as
subscriber's ID, password, and the like, required when connecting subscribers, a
connection mode support program for point-to-point mode (PPP), described below,
and a protocol process program for converting the ATM cell signal into the
Ethernet frame signal (Reassembly) and converting the Ethernet frame signal into
the ATM cell signal (Segmentation).
The PPP mode is generally classified into PPP over ATM (PPPoA) mode
and PPP over Ethernet (PPPoE) mode. The PPPoA mode is that the PPP layer is
raised over the ATM layer, whereby it is possible to decentralize the traffic easily,
configure a local network, and interlocks with a virtual private network (VPN)
based on the local network and with various intelligent programs. The PPPoE
mode is for executing the PPP connection on the Ethernet. The connection mode support program is for the PPPoA mode, especially.
The ADSL access multiplexer 50 in accordance with the present
embodiment executes the authentication and routing functions for the subscribers
in the PPPoA mode. The connecting mode support program executes routing a
subscriber's source/destination IP based on the IP table provided in the program
storing part 543. Furthermore, it is possible to configure the connection mode
support program that fixes the subscriber's IP according to each port, or endows
the subscribers with each private IP, then, supports a network address translation
(NAT) function for connecting to an external network with public IPs given.
Meanwhile, in case that the IP pool stored in the program storing part 543 or the
subscribers' information such as ID, password and the like are updated due to
change of network configuration, the updating processes are executed by means
of the equipment management system (EMS), as well known. Here, it is desired
that a flash memory is applied into the program storing part 543, thus facilitating
the registration and update of information. In case that a remote authentication
dial-in user service (RADIUS) client program, described below, is provided in the
program storing part 543, the registration and update of information is made by
means of a RADIUS server.
Meanwhile, it is possible to configure the connection mode support
program in the program storing part 543 that supports a bridge mode using the
PPPoE mode, as well as the PPPoA mode. Here, since the ADSL access
multiplexer 50 of the invention can be coupled to the NAS 30 in Fig. 1 by means of an ATM TO Ethernet switch connecting the ATM network and the Ethernet, it is
possible to incorporate the ADSL access multiplexer 50 of the invention in the
existing ADSL service network using the NAS 30. In the bridge mode, the ADSL
access multiplexer 50 doesn't execute the routing operation, but processes a
general bridge function. However, it executes protocol operations of AAL5 and
SAR layers, thus connecting the subscriber to the Internet, which will be described
in detail below. AAL5 denotes ATM adaptation layer and SAR stands for
segmentation and reassembly layer.
Still referring to Fig. 3, the central processing part 55 includes an universal
test operation PHY interface for ATM (UTOPIA) interface 551 , a peripheral
component interface (PCI) 552 and a CPU/ATM controller 553 connected
between the interfaces 551 and 552. The UTOPIA interface 441 provides an
interface for transmitting and receiving the Ethernet frame signal between the
ATM bus BS and the CPU/ATM controller 553. The PCI 552 provides an interface
for transmitting the ATM cell signal to and from the Ethernet interface part 53. The
CPU/ATM controller 553 controls the overall system and processes ADSL
communications connection for subscribers based on the connection mode
support program stored in the program storing part 543 of the storing part 54.
Besides, the CPU/ATM controller 553 converts the ATM cell signal transmitted by
way of the ADSL signal/ATM cell signal converting part 52, the ATM bus BS and
the UTOPIA interface 551 into the Ethernet frame signal (Reassembly) and
converts the Ethernet frame signal transmitted by way of the Ethernet interface part 53 and the PCI interface 552 into the ATM cell signal (Segmentation) based
on the protocol process program.
Hereinafter, the operations of the ADSL access multiplexer 50 configured
as shown in Fig. 3 will be described.
First, the signals transmitted from the respective subscribers through the
plural twisted pair wires 1 includes an ADSL signal and a telephone signal for
POTS. Here, the ADSL signal is input to the ADSL access multiplexer 50 through
the ADSL interface part 51 and the separated telephone signal for POTS is
transmitted to PSTN through a telephone line, not depicted. The input ADSL
signal is DMT-modulated and decapsulated to the ATM cell signal by way of the
G.dmt analog front end 552 and the G.dmt digital processor 521 of the ADSL
signal/ATM cell signal converting part 52. Subsequently, the central processing
part 55 refers the subscriber's ID and password transmitted from the subscriber to
the program storing part 543, thus executing the authentication process.
Furthermore, the central processing part 55 reassembles the ATM cell signal
received by way of the ATM bus BS and the UTOPIA interface 551 to be the
Ethernet frame signal and executes the collecting and routing processes for the
traffic of the respective subscribers. That is, the ATM cell signal input through the
UTOPIA interface 551 is reassembled to be the Ethernet frame signal by the
CPU/ATM controller 553 of the storing part 54. In the meantime, data generated
from the step of the protocol process of the CPU/ATM controller 553 is stored in
the RAM 541. Here, the segmentation process converting the Ethernet frame signal into the ATM cell signal is executed when transmitting data from the
Ethernet to the customer premises. Besides, during the protocol process such as
reassembly of the ATM cell signal, predetermined application processes related to
an application layer are executed by the CPU/ATM controller 553. The application
layer denotes an Internet protocol IP, the application processes includes IP
assignment, routing and NAT functions in case that the ADSL access multiplexer
50 is set to the PPP mode, for example. The NAT function is for making most use
of the insufficient public IPs. In case that the ADSL access multiplexer 50 is set to
the bridge mode, the IP administration including the assignment of IP using the IP
pool stored in the program storing part 543 is executed based on a dynamic host
configuration protocol (DHCP). The Ethernet frame signal reassembled by the
CPU/ATM controller 553 of Fig. 3 is transmitted to the Ethernet by way of the PCI
interface 552 and the Ethernet interface part 53.
Meanwhile, the processes for modulating the Ethernet frame signal
received from the external network into the ADSL signal and transmitting to the
subscriber terminal are executed contrary to the processes described above, and
the detailed description will be omitted.
According to the preferred embodiment with reference to Fig. 3, the ADSL
access multiplexer 50 supports twelve subscribers, i.e., twelve ports basically,
however, it is possible to install more ports according to the increase of the
subscriber, since the ADSL access multiplexer 50 can be interconnected to each
other. Consequently, in case of a densely built-up area, it is possible to accommodate large-scale subscribers, the same with the existing DSLAM, by
coupling a plurality of ADSL access multiplexers 50 to the Ethernet switch.
Besides, the ADSL services including VOD service using the ADSL access
multiplexer 50 in Fig. 3 based on the local network can be provided by adding a
predetermined RADIUS client program, for executing the processes of
authentication for the subscribers and imposition for the provided services, to the
program storing part 543. As well known, the RADIUS is a client/server protocol
and software that enables the customer terminal part 10 in Fig. 1 to communicate
with a central RADIUS server, not depicted, to authenticate dial-in users and
authorize their access to the requested system or service, and the detailed
description will be followed.
Now referring to Fig. 4 showing a block diagram of an ADSL access
multiplexer 50 in Fig. 2 in accordance with another embodiment of the invention,
identical components with reference to Fig. 3 are indicated by identical reference
numerals, and the detailed description will be omitted.
An additional ATM interface part 56 is provided, attached to the ATM bus
BS, for coupling to an external ATM network. The ATM interface part 56 supports
the ATM25 interface, for example. Accordingly, it is possible to connect to the NAS
30 in Fig. 1 through the ATM network coupled to the ATM interface part 56.
The program storing part 571 further includes a predetermined protocol
process program for processing protocols between the ATM cell signal passed
through the ATM interface part 56 and the ADSL signal transmitted by way of the ADSL signal/ATM cell signal converting part 52, and a connection mode support
program for supporting the PPPoE connection in addition to the program storing
part 543 in Fig. 3. According to the configuration described above, it is possible to
incorporate the ADSL access multiplexer 50 of the invention in the existing ADSL
service network using the NAS 30.
A block diagram of an ADSL network system using the ADSL access
multiplexer in Fig. 3 in accordance with an embodiment of invention is shown in
Fig. 5, identical components with reference to Fig. 1 are indicated by identical
reference numerals, and the detailed description will be omitted.
The ADSL network system comprises a customer terminal part 10, an
ADSL access multiplexer 50, an Ethernet switch 60 and a router 40, wherein the
ADSL access multiplexer 50 is operated in the PPPoA mode.
Though the respective elements in Fig. 5 are depicted by ones, at least one
customer terminal part 10 is connected to the ADSL access multiplexer 50, and at
least one ADSL access multiplexer 50 is coupled to the Ethernet switch 60 in
practice, thus configuring the ADSL network system in accordance with the
invention. The one ADSL access multiplexer 50 accommodating a small scale of
twelve subscriber, for example, converts the ADSL signal transmitted from the
customer terminal part 10 into the Ethernet frame signal and transmits it to the
Ethernet switch 60. Besides, a plurality of ADSL access multiplexers 50 are linked
to the Ethernet switch 60 so as to configure a single network, and a plurality of
customer terminal parts 10 connected to the ADSL access multiplexer 50 are interconnected to each other, thus connecting and disconnecting the
communications. The Ethernet switch 60 coupling an Ethernet to another Ethernet
applies a general Ethernet switch executing the function of switching.
That is, the object of the ADSL network system in Fig. 5 is to solve the
problems of the traffic centralization and the core network configuration commonly
raised with reference to the conventional NAS 30 by excluding the NAS 30 in Fig.
1 and decentralizing the authentication and traffic processes to the core network.
Referring to Fig. 6, a protocol layer of a digital signal processed in the
ADSL network system in Fig. 5 will be described hereinafter.
First, major protocols will be described in brief for explaining the preferred
embodiment of the invention: IP stands for the Internet protocol by which data is
sent from one computer to another on the Internet; PPP is a protocol for
communication between two computers using a serial interface; AAL5 denoting an
ATM adaptation layer is a connection-oriented protocol having variable
transmission rates for providing various services using a lower grade of ATM cell
stream; SAR standing for segmentation and reassembly layer executes the
segmentation process for dividing data of IP layer, an upper layer, into ATM cell
information field of ATM layer, a lower layer, in a predetermined size, and the
reassembly process for reassembling the ATM cell information field to be the IP
layer data of upper layer; and ADSL defines a physical layer for transmitting data.
The customer terminal part 10 is connected to the ADSL access
multiplexer 50 in PPPoA mode, whereby the transmitted ADSL signal has a multi- layer structure of IP, PPP, PPPoA, AAL5, SAR, ATM and ADSL downwardly. Here,
the data-link layer is based on the ATM layer and the physical layer is the ADSL
layer. When the ADSL signal having such the multi-layer structure in Fig. 6 is
transmitted through the twisted pair wire 1 to the ADSL access multiplexer 50 in
Fig. 5, all layers other than the IP layer are converted into the Ethernet layer and
transmitted to the Ethernet switch 60 as the Ethernet frame signal. Here, the
CPU/ATM controller 553 of the ADSL access multiplexer 50 in Fig. 3 processes
protocols related to lower layers as well as the IP layer, the application layer, and
executes various application processes, such as IP assignment for the respective
subscribers, routing, NAT and the like, as the process for the IP layer.
The Ethernet switch 60 in Fig. 6 converts all layers of the Ethernet frame
signal input from the ADSL access multiplexer 50 into the physical layer (PHY),
excepting the IP layer, and transmits to the Internet through the router 40 in Fig. 5.
Here, the physical layer (PHY) applies one of the core networks, such as STM-1 ,
DS3, E1 , T1 and the like. According to the ADSL network system in Fig. 5, it is
possible to provide high speed Internet services, excluding the NAS 30 in Fig. 1.
Besides, if a separate local server, not depicted, is coupled to the Ethernet switch
60 in Fig. 5, it is possible to provide various multimedia services, such as the local
Internet broadcasting, VOD service, and the like based on the core network to the
respective subscribers, without any traffic burdens.
A block diagram of an ADSL network system using the ADSL access
multiplexer in Fig. 3 in accordance with another embodiment of the invention is shown in Fig. 7, identical components with reference to Fig. 1 are indicated by
identical reference numerals, and the detailed description will be omitted.
The ADSL network system in Fig. 7 comprises a customer terminal part 10,
an ADSL access multiplexer 50, an ATM TO Ethernet switch 70, a NAS 30 and a
router 40, wherein the ADSL access multiplexer 50 is operated in the bridge
mode using PPPoE. The ATM TO Ethernet switch 70 transmits the Ethernet frame
signal through the ATM network, such as STM-1 for example. The ATM TO
Ethernet switch 70 for coupling the Ethernet to the ATM line is obvious to the
skilled in the art, and the detail description will be omitted. In Fig. 7, though one
ADSL access multiplexer 50 is coupled to the NAS 30, a plurality of ADSL access
multiplexers 50 are coupled to the NAS 30 through the ATM TO Ethernet switch
70 in practice. Accordingly, a plurality of customer terminal parts 10 are connected
to the NAS 30 through the corresponding ADSL access multiplexer 50.
According to the configuration described above, since a permanent virtual
circuit (PVC) connection, for example, is made between the ATM TO Ethernet
switch 70 and the NAS 30 to the dial-in subscriber, the number of PVC required is
decreased remarkably as compared with the conventional ADSL network system,
thus simplifying the network configuration. The PVC is a software-defined logical
connection in a network, which defines logical connections and required
bandwidth between end points and manages the traffic. That is, according to the
conventional ADSL network system, the PVC connection is achieved between the
customer terminal part 10 and the NAS 30, and the NAS 30 should authenticate all the dial-in subscribers and authorize their access to the requested system or
service, and make the PVC connection as much as the number of dial-in
subscribers, thus complicating the system.
Accordingly, the ADSL network system according to the present invention
is disclosed to overcome these drawbacks.
Now referring to Fig. 8, a protocol layer of a digital signal processed in the
ADSL network system in Fig. 7 will be described hereinafter.
The ADSL signal processed by the customer terminal part 10 in Fig. 8 has
a multi-layer structure of IP, PPP, PPPoE, Ethernet, AAL5, SAR, ATM and ADSL
downwardly. When the ADSL signal having such the multi-layer structure is
transmitted through the twisted pair wire 1 to the ADSL access multiplexer 50 in
Fig. 7, all layers other than the IP, PPP and PPPoE layers are converted into the
Ethernet layer and transmitted to the ATM TO Ethernet switch 70 as the Ethernet
frame signal. The ATM TO Ethernet switch 70 for intermediating the conversion
between the Ethernet frame signal and the ATM cell signal converts the Ethernet
layer of the input Ethernet frame signal into the Ethernet, AAL5, SAR, ATM and
PHY layers and transmits the converted signal to the NAS 30. Then, the NAS 30
converts all layers other than the IP layer of the input signal into the Ethernet layer
and forwards the converted signal to the Internet 3 through the router 40 in Fig. 7.
Accordingly, the multi-layer structure described above makes the ADSL access
multiplexer 50 to be operated in the bridge mode, thus connecting the ADSL
access multiplexer 50 of the invention readily to the NAS 30 comprising the conventional ADSL service network. Besides, it is possible even for the small
scale of subscribers to connect the conventional ADSL service network
inexpensively. Furthermore, it is possible to configure the network most efficiently
since the PVC connection is made only between the ATM TO Ethernet switch 60
and the NAS 30.
Lastly referring to Fig. 9, a block diagram showing a brief configuration of a
RADIUS system using the ADSL access multiplexer 50 of the invention, the
functions of authentication and imposition will be described.
A RADIUS system of Fig. 9 comprises a customer terminal part 10, an
ADSL access multiplexer 90, an Ethernet switch 60, a router 40 and a RADIUS
server coupled to the router 40 through the Internet 3. The ADSL access
multiplexer 90 is configured by establishing a predetermined RADIUS client
program in addition to the ADSL access multiplexer 50 in Fig. 3. The RADIUS
client program transmits a predetermined subscriber information to the RADIUS
server 80 in order to authenticate dial-in users and impose charges. The
subscriber information includes subscriber's ID, password, IP address, port
number, log-in time, log-out time, packet amount and the like. According to the
RADIUS system in Fig. 9, the traffic can be decentralized to the respective local
networks, thus accomplishing a stable system for the authentication and
imposition.
Therefore, according to the present invention, there is provided an ADSL
access multiplexer connected to Ethernet which can exclude the conventional NAS equipment when configuring the ADSL network system by connecting the
ADSL lines direct to existing Ethernet, and prevent the traffic centralization.
Furthermore, according to the present invention, there is provide an ADSL
access multiplexer connected to Ethernet which can facilitate the management of
subscriber, such as the authentication and the imposition, for various multimedia
services.
Moreover, according to the present invention, there is provide an ADSL
network system using the ADSL access multiplexer which can provide various
multimedia services, such as video on demand (VOD), multimedia conference,
local Internet broadcasting, and the like based on the local network more stably.
It will be apparent to those skilled in the art that various modifications and
variations can be made in the ADSL access multiplexer and the ADSL network
system using the same of the present invention without departing from the spirit or
scope of the invention. Thus, it is intended that the present invention cover the
modifications and variations of this invention provided they come within the scope
of the appended claims and their equivalents.

Claims

CLAIMS:
1. An asymmetric digital subscriber line (ADSL) access multiplexer
for connecting a plurality of ADSL lines, through which an ADSL signal having a
multi-layer structure including an application layer, a link layer and a physical layer
is transmitted, to an Ethernet, through which an Ethernet frame signal including an
application layer and an Ethernet layer is transmitted, comprising:
an ADSL interface part connected to said ADSL lines;
an ADSL signal/ATM cell signal converting part, coupled to said ADSL
interface part, for executing signal conversions between said ADSL signal and
asynchronous transfer mode (ATM) cell signal;
an Ethernet interface part executing connection to said Ethernet and
transmission of said Ethernet frame signal;
a storing part including a predetermined connection mode support program
supporting point-to-point (PPP) connection mode, a predetermined protocol
process program for said ATM cell signal, a subscriber information required when
connecting communications, and an Internet protocol (IP) pool assigned to a
subscriber; and
a central processing part, positioned between said ADSL signal/ATM cell
signal converting part and said Ethernet interface part, for executing a
segmentation process for converting said ATM cell signal into said Ethernet frame
signal in upstream channels and a reassembly process for converting said Ethernet frame signal into said ATM cell signal in downstream channels based on
said protocol process program stored in said storing part, and for assigning IP to
said subscriber when connecting said PPP mode based on said connection mode
support program and said IP pool.
2. The ADSL access multiplexer as recited in claim 1 , wherein said
ADSL signal/ATM cell signal converting part demodulates the ADSL signal input
from said ADSL interface part to decapsulate an ADSL layer, transmits the
decapsulated ADSL signal to said central processing part through an internal ATM
bus, and modulates the ATM cell signal transmitted from said central processing
part through said ATM bus to be encapsulated and forwards the encapsulated
ATM cell signal to said ADSL interface part.
3. The ADSL access multiplexer as recited in claim 1 , wherein said
ADSL signal/ATM cell signal converting part includes a coder/decoder (CODEC)
executing processes of analog-to-digital conversion and digital-to-analog
conversion for the ADSL signal, and a modem executing processes of modulation
and demodulation for the ADSL signal.
4. The ADSL access multiplexer as recited in claim 1 , wherein said
storing part includes a random access memory (RAM) for loading temporary data
generated by said central processing part and driving programs, a basic input/output system (BIOS) for storing initial data required when booting said
ADSL access multiplexer, and a program storing part having a basic operating
system, subscriber information including subscriber's ID and password required
when connecting the PPP mode, an IP pool assigned to the subscriber, said
connection mode support program and said protocol process program.
5. The ADSL access multiplexer as recited in claim 1 , wherein said
PPP mode is PPP over ATM (PPPoA); and
wherein said connection mode support program executes a process of
authentication for the subscriber based on said subscriber information.
6. The ADSL access multiplexer as recited in claim 1 , wherein said
PPP mode is PPP over ATM (PPPoA);
wherein said storing part further includes an IP table for the routing
process; and
wherein said central processing part executes said routing process for a
subscriber's source/destination IP based on said IP table.
7. The ADSL access multiplexer as recited in claim 1 , wherein said
central processing part includes an universal test operation PHY interface for ATM
(UTOPIA) interface, a peripheral component (PCI) interface, and a CPU/ATM
controller located between said UTOPIA interface and said PCI interface and driven based on said protocol process program and said connection mode
support program stored in said storing part,
wherein said UTOPIA interface provides an interface for transmitting and
receiving the ATM cell signal between said ATM bus and said CPU/ATM
controller; and
wherein said PCI interface provides an interface for transmitting and
receiving the Ethernet frame signal between said Ethernet interface part and said
CPU/ATM controller.
8. The ADSL access multiplexer as recited in claim 1 , wherein said
PPP mode is PPP over Ethernet (PPPoE);
wherein an ATM interface part is further included; and
wherein said central processing part processes communication protocols
between the ATM cell signal transmitted and received through said ATM interface
part and the ADSL signal transmitted and received through said ADSL interface
part, based on said connection mode support program and said protocol process
program.
9. The ADSL access multiplexer as recited in claim 1 , wherein said
link layer of said ADSL signal includes a PPP layer, a PPP over ATM (PPPoA)
layer, an ATM adaptation (AAL5) layer, a segmentation and reassembly (SAR)
layer, and an ATM layer downwardly; wherein said physical layer is an ADSL layer;
wherein said ATM cell signal includes the application layer, the PPP layer,
the PPPoA layer, the AAL5 layer, the SAR layer and the ATM layer downwardly;
and
wherein said application layer is the IP layer.
10. The ADSL access multiplexer as recited in claim 1 , wherein said
storing part further includes a predetermined remote authentication dial-in user
service (RADIUS) client program for processes of authentication and imposition;
and
wherein said central processing part connected to a RADIUS server
through the Internet transmits said subscriber information including subscriber's
ID, password, IP address, port number, log-in time, log-out time and packet
amount, based on said RADIUS client program.
11. Asymmetric digital subscriber line (ADSL) network system
comprising in sequence:
at least a customer terminal part, connected to Internet in a point-to-point
over ATM (PPPoA) mode, for processing an ADSL signal of which an application
layer is based on an Internet protocol (IP) and a physical layer is an ADSL layer;
at least an ADSL access multiplexer, connected to said customer terminal
part and operated in a point-to-point over ATM mode, for executing signal conversions between said ADSL signal and an Ethernet frame signal of which the
application layer is based on the IP layer and the physical layer is the Ethernet
layer;
at least an Ethernet switch, connected to said ADSL access multiplexer, for
executing signal switching between said Ethernet frame signal and an external
signal, transmitted to and from the Internet through a router, of which the
application layer is based on the IP layer and the physical layer is a core network
layer; and
at least a router, positioned between said Ethernet switch and the Internet,
for routing a subscriber's source/destination IP.
12. The ADSL network system as recited in claim 12, wherein said
plural ADSL access multiplexers are coupled to said Ethernet switch, thus
configuring a single local network.
PCT/KR2001/002029 2001-03-21 2001-11-23 Adsl access multiplexer connected to ethernet and adsl network system using the same WO2002076027A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR0110951-0A BR0110951A (en) 2001-03-21 2001-11-23 ADSL access multiplexer connected to ethernet and adsl network system that employs the same
CA002407266A CA2407266A1 (en) 2001-03-21 2001-11-23 Adsl access multiplexer connected to ethernet and adsl network system using the same
MXPA02011354A MXPA02011354A (en) 2001-03-21 2001-11-23 Adsl access multiplexer connected to ethernet and adsl network system using the same.
EP01274002A EP1382156A4 (en) 2001-03-21 2001-11-23 Adsl access multiplexer connected to ethernet and adsl network system using the same

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Cited By (25)

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WO2003075517A3 (en) * 2002-03-01 2003-11-27 Globespan Virata Inc Setup for customer premise equipment (cpe) with ppp bridge using the same public ip address at the wan side and the lan side
WO2003075517A2 (en) * 2002-03-01 2003-09-12 Globespan Virata Incorporated Setup for customer premise equipment (cpe) with ppp bridge using the same public ip address at the wan side and the lan side
CN100473031C (en) * 2003-10-21 2009-03-25 中兴通讯股份有限公司 Ethernet and ATM tier joined data vonversion and correction device and method
CN100407687C (en) * 2003-11-21 2008-07-30 华为技术有限公司 Asynchronous transmission mode exchange net user's Ethernet access method
EP1598999A2 (en) * 2004-04-01 2005-11-23 Alcatel Method and apparatus for securely establishing L3-SVC connections
EP1598999A3 (en) * 2004-04-01 2005-12-28 Alcatel Method and apparatus for securely establishing L3-SVC connections
US7978707B2 (en) 2004-04-01 2011-07-12 Alcatel Lucent Method and apparatus for securely establishing L3-SVC connections
US8837489B2 (en) 2004-04-01 2014-09-16 Sound View Innovations, Llc Method and apparatus for securely establishing L3-SVC connections
WO2006007793A1 (en) 2004-07-20 2006-01-26 Huawei Technologies Co., Ltd. A method and apparatus supporting a pppoa terminal accessing
EP1750398A4 (en) * 2004-07-20 2007-10-31 Huawei Tech Co Ltd A method and apparatus supporting a pppoa terminal accessing
EP1750398A1 (en) * 2004-07-20 2007-02-07 Huawei Technologies Co., Ltd. A method and apparatus supporting a pppoa terminal accessing
US7590148B2 (en) 2004-07-20 2009-09-15 Huawei Technologies Co., Ltd. Method and device for supporting access of point to point protocol over ATM terminal
US7801148B2 (en) 2004-07-20 2010-09-21 Huawei Technologies Co., Ltd. Method and device for supporting access of point to point protocol over ATM terminal
EP1872500A2 (en) * 2005-04-22 2008-01-02 Cisco Technology, Inc. Techniques for encapsulating point to point protocol (ppp) over ethernet frames
WO2006115881A2 (en) 2005-04-22 2006-11-02 Cisco Technology, Inc. Techniques for encapsulating point to point protocol (ppp) over ethernet frames
US8204080B2 (en) 2005-04-22 2012-06-19 Cisco Technology, Inc. Techniques for encapsulating point to point (PPP) over Ethernet frames
EP1872500A4 (en) * 2005-04-22 2012-04-18 Cisco Tech Inc Techniques for encapsulating point to point protocol (ppp) over ethernet frames
FR2885464A1 (en) * 2005-05-09 2006-11-10 France Telecom METHOD AND DEVICE FOR CONTROLLING ACCESS
WO2006120331A1 (en) * 2005-05-09 2006-11-16 France Telecom Access control method and device
WO2013061292A1 (en) * 2011-10-27 2013-05-02 Centre For Development Of Telematics (C-Dot) A communication system for managing leased line network with wireless fallback
WO2013061211A1 (en) * 2011-10-27 2013-05-02 Centre For Development Of Telematics (C-Dot) A communication system for managing leased line network and a method thereof
GB2509465A (en) * 2011-10-27 2014-07-02 Ct For Dev Of Telematics C Dot A communication system for managing leased line network with wireless fallback
GB2510075A (en) * 2011-10-27 2014-07-23 Ct For Dev Of Telematics C Dot A communication system for managing leased line network and a method thereof
WO2015063213A1 (en) 2013-10-31 2015-05-07 Shell Internationale Research Maatschappij B.V. Process for the conversion of a paraffinic feedstock
US9896632B2 (en) 2013-10-31 2018-02-20 Shell Oil Company Process for the conversion of a paraffinic feedstock

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MXPA02011354A (en) 2003-04-25
BR0110951A (en) 2003-06-03
CA2407266A1 (en) 2002-09-26
EP1382156A1 (en) 2004-01-21

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