JPH11331238A - Dttc/dttb network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To access high-speed lnternet at low cost by providing an integrated Ethernet device connected between a second terminal part of a DSL and an Ethernet line and a 10 Base T interface or the like connected to the Ethernet line. SOLUTION: An ATU-R 50 receives a data stream through a DSL line 100 and is connected to a control processor 130. The control processor 130 sends the data stream subjected to buffering through the ATU-R 50 and DSL line 100 to an ATU-C 30. Besides, the control processor 130 communicates with a large number of 10 base T interfaces 65. The ATU-R 50, control processor 130 and a lot of 10 Base T interfaces 65 are packaged as an integrated Ether DSL device 40 or interconnected. Then, the respective 10 Base T interfaces 65 are connected to the Ethernet line 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a DTTC (Digital Subscriber Lin) for improving broadband network operation.
e (DSL) -To-The-Curb) / DTTB (DSL-To-The-Build)
ing) Regarding the network.

[0002]

2. Description of the Related Art Analog modems are frequently used for small businesses and telecommuters to access the Internet at high speed. However, analog modems are currently about 56Kbps
The communication speed is limited to 53Kbp in some countries.
s is regulated by law. Even as modems and peripheral technologies improve, access speeds are limited as long as noise is present on the telephone line. In addition, analog modems place a heavy load on the telephone exchange office's call service, and limit the amount of call on the communication network.

[0003] ISDN (Integrated Service Digital N)
etwork) is 64 for one signal channel of 16 Kbps.
144K with two voice / data channels of Kbps
bps communication speed. However, it is not widely used in the North American region due to implementation costs and technical complexity. Furthermore, the communication speed is not sufficient for a user trying to access the network.

FTTC / FTTB (Fiber-To-The-Curb)
and Fiber-To-The-Building) provide broadband multimedia access in the transmission of real-time video data to provide video and switching digital video broadcasts. It uses high-speed modem technology to transmit data over fiber optics to the edge of the building or to the building and to provide 51 Mbps downstream and 1.6 Mbps upstream communication rates. Internet access speeds are adequate with this technology, but at a high cost.

[0005] Hybrid fiber / coaxial cable or H
FC is associated with optical fiber and coaxial cable configurations used to distribute data, such as voice and video, to local broadband communications. Cable operators are seeking to utilize the techniques described above to provide two-way communication for video imaging and Internet access at existing cable facilities. However, most existing cable facilities do not support two-way communication, and HF
The problem is that the frequency band provided by C is used simultaneously by hundreds or thousands of people. Therefore, the frequency band that can be used by one person becomes smaller. In addition, shared media connections do not allow data confidentiality between users.

ADSL (Asymmetrical Digital Subscri)
ber Line) and its high-speed variants (xDSL) are promising technologies for high-speed Internet access. However, this technique is also expensive for general users, and the cost of the link connected for each station is also required depending on the selection device for connecting to the ADSL line. The available bandwidth of ordinary telephone lines consisting of available copper wire includes:
There is a 6 Mbps downstream and a 640 Kbps upstream.

[0007] ATM (Asynchronous Transfer) is a high-speed switching and multiplexing technology that uses 53-byte cells to transmit not only voice and video data but also different types of simultaneous network traffic.
rMode) is ideal for implementing xDSL technology. However, ATMs are also expensive. Advantages of ATM include virtual paths and virtual channel connections used for separating network traffic, and various traffic management capabilities.

Ethernet is a LAN (local area net)
work) provide high speed network access in the environment. It is a standardized and complete technology with widely available hardware and software. However, it was designed for LAN applications,
It can be used only at a distance of about 100 m without a relay device.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low cost and high speed Internet access DTT.
It is to provide a C / DTTB network.

[0010]

SUMMARY OF THE INVENTION DTTC / DT of the present invention
The TB network comprises a DSL having first and second ends.
A central office DSL transceiver connected to the first end of the DSL, an integrated Ethernet device connected between the second end of the DSL and the Ethernet line, and a 10BaseT interface connected to the Ethernet line. , Is included. DSL is ADSL, SDSL, H
Either DSL or VDSL. It further comprises an ATM for transmitting information through DSL. The integrated Ethernet device is a remote terminal D connected to the second end of the DSL.
It comprises an SL transceiver, a control processor connected to the DSL transceiver of the remote terminal, and a 10BaseT interface connected to the Ethernet line. The DSLAM further comprises a DSLAM connected to the DSL transceiver of the central office.

[0011] The operation is the method of operating a DTTC / DTTB network, comprising:
L from the central office DSL transceiver to the remote terminal D
Transmitting the first data stream from the DSL transceiver of the remote terminal to the control processor, separating the first data stream into one or more first information packets by the control processor; Sending the first information packet from the control processor to the first 10BaseT interface; and transmitting the first information packet from the first 10BaseT interface to the second 10BaseT interface.
Transmitting the second information packet from the second 10BaseT interface to the first 10
Transmitting the second information packet from the first 10BaseT interface to the control processor; buffering the second information packet in the second data stream with the control processor; Sending a second data stream from the control processor to the remote terminal DSL transceiver through the DSL from the remote terminal DSL transceiver to the central office DSL transceiver. DSL is ADSL, SDSL, H
Either DSL or VDSL. It further comprises an ATM for transmitting information through DSL. The DSLAM further comprises a DSLAM connected to the DSL transceiver of the central office.

Another DTTC / DTTB network includes a DSL having first and second ends, and a DSL.
A central office DSL transceiver connected to the first end of the
An integrated Ethernet device connected between the second end of the SL and the impedance transformer, and an Ethernet network interface card connected to the impedance transformer. DSL is ADS
L, SDSL, HDSL, or VDSL.
It further comprises an ATM for transmitting information through DSL.
The integrated Ethernet device includes a remote terminal DSL transceiver connected to the second end of the DSL and a remote terminal DSL transceiver.
It comprises a control processor connected to the transceiver and an Ethernet hub interface connected to the CATV cable network connected to the impedance transformer. DSL connected to central office DSL transceiver
AM is further provided.

[0013] The operation is as described in the method of operating a DTTC / DTTB network.
L from the central office DSL transceiver to the remote terminal D
Transmitting the first data stream from the DSL transceiver of the remote terminal to the control processor; separating the first data stream into first information packets by the control processor; Sending a packet from the control processor to the Ethernet hub interface, transmitting a first information packet from the Ethernet hub interface to the network interface card, transmitting a second information packet from the network interface card to the Ethernet hub, Sending information packets from the Ethernet hub to the control processor; buffering the second information packets in the control processor in a second data stream; and transmitting the second data stream from the control processor to the DSL transceiver of the remote terminal. And performing the steps of sending, and transmitting the second data stream from the DSL transceiver of the remote terminal to the DSL transceiver at the central office through DSL, a. DSL is ADSL, SDSL, HDS
L or VDSL. It further comprises an ATM for transmitting information through DSL. The DSLAM further comprises a DSLAM connected to the DSL transceiver of the central office.

[0014]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

[0015] ADSL (Asymmetric Digital Subscriber Line) technology uses conventional copper wire ordinary telephone lines for high speed Internet access, LAN-to-LAN connections and access to broadband services. The combination of ADSL and ATM technology provides for the transmission of multimedia data that guarantees unique services for various traffics. AD
SL provides long-range, high-frequency band communication from long-distance telephone lines and central offices to homes with high-speed Internet access, but at a very high cost.

Ethernet provides high-speed network access in an efficient manner on LANs. This is a technology in which hardware and software are standardized. However, only a distance of about 100 m can be used without a relay device.

The DTTC (Digital Subscriber L) of the present invention
ine (DSL) -To-The-Curb) / DTTB (DSL-To-The-Bui)
The lding) structure has the advantages of ADSL and Ethernet, and solves their respective disadvantages. DTTC / DTT
In B, the final hectometer at low cost (hectomete
r) Use Ethernet to provide network access to the network and provide high frequency bandwidth. Ethernet access is coupled to ADSL by an integrated EtherDSL device that acts as a multiplexer. The integrated EtherDSL device provides buffering, confidentiality and traffic management capabilities.

On the ADSL side of the network, existing telephone lines provide the long-distance, high-speed communication capability required for Internet access. The use of ATM by ADSL also provides various network traffic management capabilities.

FIG. 1 is a configuration diagram of a DTTC / DTTB network 10 of the present invention. The central office DSL transceiver or ATU-C 30 is an ATM with virtual channel capability for transmitting information through the network side 110.
Connected to DSL line 100 using technology. A
The TU-C 30 is a type of remote central office that allows efficient transmission of voice traffic through a multiplexing process and a high-speed trunk interface with a switch.
LC (Digital Loop Carrier) or DSLAM (Digita
l Subscriber Line Access Multiplexer) 20. Local access to the network is provided by DLC line cards that convert analog voice traffic to digital traffic for network transmission. DSL line 100 is a remote terminal DS located 15,000 feet away from ATU-C30.
L transceiver or ATU-R50. The standard telephone line is used for the DSL line 100.

ATU-R 50 receives the data stream over DSL line 100 and
Connected to. The control processor 130 is an ATU-R5
0 and the buffered data stream through the DSL line 100 is sent to the ATU-C 30. The control processor 130 communicates with a number of 10BaseT interfaces 65. ATU-R50, control processor 1
30 and a number of 10BaseT interfaces 65
Packaged as an integrated EtherDSL device 40,
Or they are interconnected.

Each 10BaseT interface 65 is connected to an Ethernet line 70,
Is connected to another 10BaseT interface 95. The 10BaseT interface 95 is arranged in a house 80, a small business, or the like. The user side 120 including the 10BaseT interfaces 65 and 95 and the Ethernet line 70 can extend the distance between the Ethernet lines 70 to about 270 feet.

The DTTC / DTTB network 10 of the present invention provides ATM virtual channel capability through the DSL line 100, preferably ADSL, of the user side 120 and the network side 110 occupying the hectometer at the end of the network. In each house 80, DTTC / DT
TB network 10 establishes one or more ATM virtual channels over DSL line 100. When transmitting one packet from the house 80 to the DTTC / DTTB network 10, each 10BaseT interface 90 transfers the packet through the Ethernet line 70 to each 10BaseT.
Send to interface 60. Integrated Ethernet device 40
When necessary, the control processor 130 buffers the packet received together with other packets, and confirms the 10BaseT interface 90 used for transmitting the packet by the control processor 130. The buffered packets are then converted to an ATM cell structure, and the formatted ATM cell or cells are sent to the ATU-R 50 and transmitted over the DSL line 100 through an ATM virtual channel dedicated to the 10BaseT interface 90. If multiple virtual channels are configured in each house 80, the receiving MAC (Media Access Control) address of the packet is checked by the control processor 130 to determine which virtual channel to use for transmitting the packet data. ATU-C30
Is used to receive a formatted ATM cell or cells.

When transmitting data in the reverse direction, ATM cells received by the ATU-R 50 through the DSL line 100 are assembled into packets by the control processor 130 in EtherDSL. Virtual channel I for incoming packets
D (virtual channel identity) is used to determine the Ethernet line 70 and selects the house 80 to receive the fragmented packets. After that, the packet selected by the control processor 130 through the Ethernet line 70 is
10 Bass connected to BaseT interface 90
It is transmitted to the eT interface 60.

The integrated EtherDSL unit 40 includes a control processor 130, an ATM / DSL uplink card (ATU-R50) and a number of 10BaseT interfaces 65. That is, 16 Ethernets are provided. The integrated EtherDSL unit 40 has at least four modes of operation: an ATM-only access mode, an Ethernet-only access mode, an ATM uplink mode serving as a LAN hub, and a LAN.
It has a DSL uplink mode that acts as a hub.

In the case of the ATM dedicated access mode, the Ethernet packet of the individual user is converted into the ATM format and transmitted through a dedicated virtual channel using the DSL line 100. Users connecting to the same integrated EtherDSL 40 cannot access each other's packets, and the mapping between each Ethernet port and the ATM virtual channel is used for switching network traffic.

In the case of the Ethernet-only access mode,
Ethernet data frames are transmitted directly to the DSL line 100 without conversion to the ATM protocol. Individual user access is still dedicated for security, and users connecting to the same integrated EtherDSL unit 40 cannot access other packets without passing through the appropriate network protocol. in this case,
MAC addresses are used for switching network traffic.

When operating in the ATM uplink mode functioning as a LAN hub, the integrated EtherDSL unit 40 becomes CPE (Customer Premise Equipment) which is a remote communication facility provided on the subscriber side. Telecommunications equipment is maintained by the subscriber, unlike network equipment maintained by telecommunications carriers. Integrated Et
herDSL unit 40 is more than DTTC / DTT
It does not operate in the B environment and acts as a LAN hub in a user environment with an ATM / DSL uplink. 10Ba
The packet first generated by the user on the seT interface 90 is transmitted by the EtherDSL 40 to all other 10BaseT interfaces 90 connected to the EtherDSL unit 40. In addition, the EtherDSL unit 40 checks the destination MAC address in order to determine whether the frame being transmitted is a broadcast frame or an unexpected frame for another local MAC.

As a result, if the frame being transmitted is a broadcast frame, the packet is transmitted to the ATM / DSL uplink using the virtual channel shared by all the 10BaseT interfaces 95. If integration
When the EtherDSL unit 40 is connected to a multiplex destination using different virtual channels, the destination MAC address selects the appropriate virtual channel for data transmission. A
For the first packet generated on the TM / DSL uplink, the integrated EtherDSL unit 40
Each 10 Bass packet is transmitted through the T interface 60.
The data is transmitted to the eT interface 90. Each 10BaseT
Interface 90 removes unaddressed packets.

When operating in the DSL uplink mode acting as a LAN hub, the data transmission process is:
Similar to the ATM uplink except that the ATM protocol is not used on the DSL line 100. In this case, the central office or DLC is configured to handle ATM adaptation of the received data.

In the DTTC application, the integrated Ethe
The rDSL unit 40 is located near each house 80 outdoors.
The integrated EtherDSL unit 40 provides stable access to the individual's Internet and also provides stable access to the teleworker's communal network. For this application, one of an ATM-only access mode and an Ethernet-only mode is used, and the ATM-only access mode is preferable.
This is because the ATM-only access mode not only allows good data traffic separation, but also allows multiple virtual channels per house. A virtual channel control scheme is used for users to access the Internet and the communal networks, while each network is stably separated. For DTTC applications, the integrated EtherDSL unit 40 is environmentally protected underground and includes a quad port Ethernet interface card, ADSL uplink card and control processor card.

In the DTTB application, the integrated Ethe
The rDSL unit 40 is provided in a building. DTTC
It has the same application and operation mode as. However, the environmental requirements of the integrated EtherDSL unit 40 are DT
Since it is wider than the environmental requirements of the TC application, the package cost can be significantly reduced. D
In the case of TTB, a 32-port Ethernet interface is generally used. In this case, VDSL may be used, but since the transmission range of the VDSL unit is limited, it is better to use ATU-C30 in the DLC.

LAN with ATM uplink mode
Hubs and LAN hubs with DSL uplink mode are ideal for small offices. The integrated EtherDSL unit 40 operating in this mode has a basic LA
Provides N-functions as well as uplinks to office networks and public networks. For example, a public library is a personal computer (PC).
ter) and its local PC using Ethernet technology
An integrated EtherDSL unit 40 can be used to connect to the database, and the ATM / DSL uplink connects the branch library to the main library and the Internet. Therefore, the PC user can search for information through the local branch database, the database stored in the main library, and the Internet. Schools, bank branches, government offices and LA
Other locations using N have similar applications.
Also in this case, the ATM uplink mode is desirable. In this case, there is no need to protect the integrated EtherDSL unit 40 underground.

FIG. 2 shows a cable TV arranged inside a building.
FIG. 10 is a configuration diagram of another embodiment of the present invention using (CATV) wiring. Instead of providing the integrated EtherDSL unit 40 outside the building, it is placed inside or outside the building 150 that houses the CATV network 160. In FIG. 2, the EtherDSL unit 40 is located inside a building 150 and, instead of using a 10BaseT interface, one or more Ethernet hub interfaces 17.
0, and the Ethernet hub interface 170 is connected to a number of Ethernet network interface cards (NICs) provided in the user PC 190, respectively. In this case, the hardwire link is a 75Ω C
An ATV cable 200 is provided.
Ends with a 75-50 Ω transformer 210 from the integrated EtherDSL unit 40 for each user. Each transformer 210
Are connected to a 50Ω Ethernet cable 220 which is connected to a single NIC 180.

In all of the above cases, the asymmetric DSL (AD
SL), symmetric DSL (SDSL), high-speed DSL (HDS)
L) and ultra high speed DSL (VDSL),
XDSL not limited to ADSL, VDSL and SDSL
Can be used for the DSL line 100.

[0035]

The present invention provides higher frequency bandwidth available to analog modems, ISDN and cable company modems at a lower cost than networks using either ADSL or FTTC technology while maintaining high security. I will provide a. Also, by using ATM technology to transmit information through DSL, even if an individual user is sharing with different users of the DSL line, D
The maximum speed of the SL line can be used.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the present invention.

Claims (18)

[Claims] A DSL having first and second ends;
A central office DSL transceiver connected to the first end of the SL, an integrated Ethernet device connected between the second end of the DSL and the Ethernet line, and a 10BaseT interface connected to the Ethernet line. DTTC / DTTB network characterized by including. 2. DSL is ADSL, SDSL, HDS
2. The DTT according to claim 1, which is any one of L and VDSL.
C / DTTB network. 3. The DTTC / DTTB network of claim 1, further comprising an ATM for transmitting information through DSL. 4. The integrated Ethernet device is a second DSL.
2. The DTTC according to claim 1, further comprising: a DSL transceiver of the remote terminal connected to the end, a control processor connected to the DSL transceiver of the remote terminal, and a 10BaseT interface connected to the Ethernet line.
/ DTTB network. 5. A D connected to a central office DSL transceiver.
5. The DTTC / DT of claim 4, further comprising a SLAM.
TB network. 6. The method of operating a DTTC / DTTB network, comprising: transmitting a first data stream through a DSL to a central office DSL.
Transmitting from the transceiver to the DSL transceiver of the remote terminal, transmitting the first data stream from the DSL transceiver of the remote terminal to the control processor, and transmitting the first data stream by the control processor to one or more first DSL transceivers. Separating the first information packet from the control processor to the first 10BaseT interface; transmitting the first information packet from the first 10BaseT interface to the second 10BaseT interface; The information packet to the second 10BaseT
Transmitting from the interface to the first 10BaseT interface; and transmitting the second information packet to the first 10BaseT interface.
sending the second information packet from the control processor to the DSL transceiver of the remote terminal; transmitting the second information packet from the control processor to the DSL transceiver of the remote terminal; Transmitting the data stream from the DSL transceiver of the remote terminal to the DSL transceiver of the central office through DSL. 7. DSL is ADSL, SDSL, HDS
7. The operation method according to claim 6, wherein the operation method is one of L and VDSL. 8. The operating method according to claim 6, further comprising an ATM for transmitting information through DSL. 9. A D connected to a central office DSL transceiver.
The method of claim 6, further comprising a SLAM. 10. A DSL having first and second ends,
A central office DSL transceiver connected to the first end of the DSL, an integrated Ethernet device connected between the second end of the DSL and the impedance transformer, and an Ethernet network interface connected to the impedance transformer And a DTTC / DT comprising:
TB network. 11. DSL is ADSL, SDSL, HD
The DT according to claim 10, which is one of SL and VDSL.
TC / DTTB network. 12. ATM for transmitting information through DSL
The DTTC / DTTB network of claim 10, further comprising: 13. The integrated Ethernet device is connected to a DSL transceiver of the remote terminal connected to the second end of the DSL, a control processor connected to the DSL transceiver of the remote terminal, and an impedance transformer. And an Ethernet hub interface connected to the CATV cable network.
DTTB network. 14. The DTTC / CDMA system of claim 10, further comprising a DSLAM connected to the central office DSL transceiver.
DTTB network. 15. The method of operating a DTTC / DTTB network, comprising: transmitting a first data stream through a DSL to a central office DSL.
Transmitting from the transceiver to the DSL transceiver of the remote terminal, transmitting the first data stream from the DSL transceiver of the remote terminal to the control processor, and separating the first data stream into first information packets by the control processor. Transmitting the first information packet from the control processor to the Ethernet hub interface, transmitting the first information packet from the Ethernet hub interface to the network interface card, and transmitting the second information packet from the network interface card to the Ethernet hub. Transmitting, sending the second information packet from the Ethernet hub to the control processor, buffering the second information packet in the control processor in the second data stream, and transferring the second data stream from the control processor. Method of operation and performing the steps of sending the septum terminal of DSL transceivers, and transmitting the second data stream from the DSL transceiver of the remote terminal to the DSL transceiver at the central office through DSL, a. 16. DSL is ADSL, SDSL, HD
The operation method according to claim 15, wherein the operation method is one of SL and VDSL. 17. ATM for transmitting information through DSL
The operation method according to claim 15, further comprising: 18. The method of claim 15, further comprising a DSLAM connected to the central office DSL transceiver.