JP2010109936A - Access system network/mpls network data transfer system, method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an access system network/MPLS (Multi Protocol Label Switching) network data transfer system, method and program by which an ATM (Asynchronous Transfer Model) line or a TDM (Time Division Multiplexing) line enters into an MPLS network while using an inexpensive PWE (Pseudo Wire Emulation) device. <P>SOLUTION: An access system network/MPLS network data transfer system includes: an aggregation device connected to a VLAN network and an MPLS network and including an interwork function; and a PWE device which connected to an access system network and the VLAN network and including Ethernet encapsulation function. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an access network-MPLS network data transfer system, method, and program.

  2. Description of the Related Art In recent years, PWE for placing legacy ATM (Asynchronous Transfer Mode) lines and TDM (Time Division Multiplexing) lines on networks such as Ethernet (Ethernet: registered trademark) networks, IP (Internet Protocol) networks, and MPLS (Multi Protocol Label Switching) networks. A technology called (Pseudo Wire Emulation) has been actively performed.

  In addition, a backbone network technology using an MPLS network is demanded among carrier-related traders. In order to put an ATM line or a TDM line on the MPLS network, it is necessary to provide the MPLS function to the PWE apparatus, but many inexpensive PWE apparatuses have only an Ethernet function without a protocol. In order to operate MPLS, it is necessary to operate a large number of protocols. In order to implement MPLS, man-hours for development and evaluation are enormous. In particular, an inexpensive access system device is required, but if the MPLS function is installed, the price increases and it is difficult to satisfy the demand.

  In addition, when MPLS aggregation is performed on the aggregation device side using an inexpensive PWE device having only an Ethernet function without a protocol, an ATM / TDM over Ethernet MPLS is used because an Ethernet header and an MPLS header are attached to ATM or TDM. It becomes a packet format, and the overhead is increased by the Ethernet header, and the bandwidth is reduced.

  Here, a case where a PWE device that does not have an MPLS function and is associated with the present invention is replaced with a PWE device that has an MPLS function will be described with reference to FIG.

FIG. 5 is a conceptual diagram of a data transfer system related to the present invention.
In FIG. 5, a PWE device having an MPLS function performs MPLS encapsulation on an ATM cell or a TDM frame and places it on the MPLS network.

Here, examples of techniques related to the data transfer system between the access network and the MPLS network are described in Patent Documents 1 to 3.
The ATM converter disclosed in Patent Document 1 is an ATM converter that performs media conversion between ATM cells and Ethernet frames in order to connect ATM devices at multiple points via a wide-area Ethernet network and perform communication between ATM devices. , Equipped with an ATM interface for executing an interface between an ATM device and an ATM cell, an Ethernet interface for executing an interface between a wide area Ethernet network and an Ethernet frame, and a media converting means for effectively controlling media conversion between the ATM cell and the Ethernet frame. And operates as follows.

  According to this ATM converter, an ATM cell supplied from an ATM device is converted into an Ethernet frame, the Ethernet frame is transmitted to a wide area Ethernet network, and the Ethernet frame received from the wide area Ethernet network is converted into an ATM cell to be converted into an ATM apparatus. It is said that broadband and inexpensive communication can be realized between the ATM devices via the Ethernet network.

  The MPLS transfer method disclosed in Japanese Patent Laid-Open No. 2004-228561 is “in an MPLS network having a plurality of MPLS (Multi Protocol Label Switching) routers having a label switching function, each of the MPLS routers divides the MPLS network into a plurality of domains, (Label Switched Path) is established, information of the established LSP is recorded in the storage unit, and among the MPLS routers, the source MPLS edge router that has received the packet from the user network is (1) the packet destination edge router. A domain boundary that is an MPLS router that is installed at the boundary of a domain by adding a label indicating a certain destination MPLS edge router and (2) a label indicating a domain through which the destination MPLS edge router is reached to the packet and transmitting the packet. Packets received by the MPLS router The domain boundary MPLS router of the domain including the destination MPLS edge router transfers the packet to the next transfer destination domain with reference to the label attached to the received packet and the domain boundary MPLS. Referring to the LSP information of the router, the LSP established with the destination MPLS edge router is selected from the established LSPs, and the packet is transferred. ” To work.

  The MPLS router divides the MPLS network into domains and establishes an LSP for each domain. In addition, since the source MPLS edge router adds the label of the destination MPLS edge router and the domain label of the domain to be passed to the packet to be transmitted, the domain boundary MPLS router that becomes the break of the LSP is based on this label. It is assumed that a packet can be transferred to an LSP connected to a domain (or destination MPLS edge router).

  The packet transfer control method disclosed in Patent Document 3 is a packet transfer control method in a packet transfer apparatus that interworkes an MPLS network that uses MPLS and a network that does not use the MPLS protocol. In the MPLS network, the layer of the OSI model The packet is switched by the label in the MPLS header given before the 3 header, and in a network not using the MPLS protocol, the layer 2 of the OSI model different from the MPLS header given before the Layer 3 header. A packet is switched by the header, and a plurality of logical networks identified by the identifier of the layer 2 header are configured in the network that does not use the MPLS protocol. When a packet is received from a network that does not use the MPLS protocol and the response is set in the packet transfer apparatus, the received packet is included in a plurality of logical networks by the identifier in the layer 2 header attached to the received packet. , Judging which network it belongs to, examining the correspondence, determining the label to be given to the received packet based only on the correspondence, and receiving the packet from the MPLS network, examining the correspondence and examining only the correspondence And determining an identifier corresponding to a label attached to the received packet from the MPLS network, and determining to which of a plurality of logical networks the received packet is transmitted from the MPLS network. And the correspondence between identifiers and labels Are those "corresponds to pairs 1, operates as follows.

According to this packet transfer control method, a packet header used in a network that does not use the MPLS protocol is provided to a packet transfer apparatus that interworkes an MPLS network and a network that does not use the MPLS protocol. A set of information of a layer header (hereinafter referred to as “layer 2 header”) corresponding to layer 2 of the OSI model different from the MPLS header and the information of the layer 3 header, which is given before the MPLS header, and the MPLS header The header conversion information indicating the correspondence with the information is set. The packet transfer apparatus uses this information to convert the layer 2 header into an MPLS header.
JP 2007-184681 A JP 2007-235381 A JP 2008-219934 A

  However, when a PWE device that does not have an MPLS function related to the present invention is replaced with a PWE device that has an MPLS function, the number of man-hours for development and evaluation for operating the MPLS is enormous. It is difficult to satisfy the demand for inexpensive devices.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an access network-MPLS network data transfer system, method, and program capable of entering an ATM line or a TDM line into an MPLS network while using an inexpensive PWE device. .

  The system of the present invention comprises an aggregation device connected to a VLAN network and an MPLS network and having an interwork function, and a PWE device connected to the access network and the VLAN network and having an ether encapsulation function. It is characterized by.

  In the first method of the present invention, the aggregation device connected to the VLAN network and the MPLS network transmits and receives signals to and from the MPLS network, and the Ethernet encapsulated ATM is converted into the MPLS encapsulated ATM and the MPLS encapsulated ATM. Is converted to Ethernet-encapsulated ATM, and signals are transmitted / received to / from the VLAN network, and signals are transmitted / received to / from the access network on the PWE device side connected to the access network and VLAN network, Signals are transmitted / received to / from a VLAN network, and Ethernet encapsulation for placing ATM cells on the VLAN network and decapsulation for placing Ethernet-encapsulated ATM on an ATM access network are performed.

  In the second method of the present invention, signals are transmitted to and received from the MPLS network on the aggregation device side connected to the VLAN network and the MPLS network, and the Ether-encapsulated TDM is converted into the MPLS-encapsulated TDM and the MPLS-encapsulated TDM. Is converted to Ethernet-encapsulated TDM, and signals are transmitted / received to / from the VLAN network, and signals are transmitted / received to / from the access network on the access network and the PWE device connected to the VLAN network, Signals are transmitted / received to / from a VLAN network, and Ethernet encapsulation for placing a TDM frame on the VLAN network and decapsulation for placing an Ether-encapsulated TDM on an ATM access network are performed.

  According to a first program of the present invention, an MPLS interface unit transmits / receives a signal to / from the MPLS network to a computer of an aggregation device connected to a VLAN network and an MPLS network, and an interwork function unit includes an Ethernet capsule. Procedure for converting ATM ATM to MPLS encapsulated ATM and MPLS encapsulated ATM to ether encapsulated ATM, VLAN interface unit transmitting / receiving signals to / from the VLAN network, connected to the access network and VLAN network The ATM interface unit transmits / receives a signal to / from the access network, the VLAN interface unit transmits / receives a signal to / from the VLAN network, and the Ethernet encapsulation unit The ATM cell is connected to the VLAN. Ether encapsulation for placing the procedure to perform decapsulation to put the Ethernet encapsulation ATM to ATM access system network, characterized in that for the execution.

  According to a second program of the present invention, an MPLS interface unit transmits / receives a signal to / from the MPLS network to a computer of an aggregation device connected to a VLAN network and an MPLS network, and an interwork function unit includes an Ethernet capsule. The procedure for converting an encrypted TDM into an MPLS-encapsulated TDM and an MPLS-encapsulated TDM into an Ethernet-encapsulated TDM, a procedure for transmitting and receiving signals to and from the VLAN network, and an access network and a VLAN network The TDM interface unit transmits / receives a signal to / from the access network, the VLAN interface unit transmits / receives a signal to / from the VLAN network, the Ethernet encapsulation unit, The TDM frame is the VL Ether encapsulation for placing the N network, characterized in that to perform the procedure for decapsulation to put the Ethernet encapsulation TDM to TDM access system network.

  According to the present invention, it is possible to provide an access network-MPLS network data transfer system, method, and program that allow an ATM line or a TDM line to be placed in an MPLS network while using an inexpensive PWE device. .

<Features>
According to the present invention, when an ATM line or a TDM line is placed on an MPLS network using an access PWE device that does not have an MPLS function, the ATM network or the TDM line is mounted on the MPLS network by using a function for interworking the VLAN network and the MPLS network. It is characterized by being possible.

  In addition, the MPLS-encapsulated frame is not subjected to MPLS encapsulation as it is, but if it is ATM, the MPLS header is acquired from the C-Tag in the ether header, and if it is TDM, the MPLS header is obtained from the ECID in the ether header. Is obtained, and encapsulation header conversion is performed, so that the bandwidth for the ether header can be effectively used instead of the ATM / TDMovers Ethernet MPLS packet.

<Configuration>
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a conceptual diagram showing an embodiment of a data transfer system between an access network and an MPLS network according to the present invention. Referring to FIG. 2, the position of an apparatus having an interwork function is shown as an embodiment of the present invention.
As shown in FIG. 2, the data transfer system between the access network and the MPLS network includes a PWE-compatible device 9 that does not have an MPLS function and an aggregation device 10 that has an interwork function.

  The PWE-compatible device 9 is disposed between the access network 11 and the VLAN network 12. The PWE-compatible device 9 is used to place ATM cells on the VLAN network, an ATM interface unit 13 that transmits / receives signals to / from the access network 11, a VLAN interface unit 14 that transmits / receives signals to / from the VLAN network 12, and the ATM network. And an Ethernet encapsulation unit 15 for performing decapsulation for placing the Ethernet-encapsulated ATM1 on the ATM access network.

  The aggregation device 10 is disposed between the VLAN network 12 and the MPLS network 16. The aggregation device 10 includes a VLAN interface unit 17 that transmits / receives signals to / from the VLAN network 12, an MPLS interface unit 18 that transmits / receives signals to / from the MPLS network 16, and Ethernet-encapsulated ATM 1 into MPLS-encapsulated ATM 2. It comprises an interwork function unit 19 that converts MPLS-encapsulated ATM2 into Ethernet-encapsulated ATM1.

FIG. 1 is an explanatory diagram showing a state of data conversion in an embodiment of a data transfer system between an access network and an MPLS network according to the present invention.
Referring to FIG. 1, there is shown format conversion performed by an interwork function unit 19 used in an access network-MPLS data transfer system according to the present invention. In FIG. 1, a capsule is configured by Ether-encapsulated ATM1 and MPLS-encapsulated ATM2.
The Ethernet-encapsulated ATM 1 includes an ATM cell 3 obtained by removing header error control from an ATM original cell, an Ethernet header unit 4 having a VID, and an FCS unit 5.
The ether header unit 4 includes a destination MAC (Media Access Control) address, a transmission source MAC address, an S-Tag (Service-Tag) unit, a C-Tag (Customer-Tag) unit 7, a Type, and a Control Word. Consists of.

The MPLS encapsulated ATM 2 includes a cell 3 obtained by removing header error control from an ATM original cell, an MPLS header unit 6, and an FCS unit 5.
The MPLS header section 6 includes a destination MAC address, a transmission source MAC address, Type, Tunnel-LABEL1, VC-LABEL8, and Control Word.

<Operation>
Next, an operation for ATM cells to enter the MPLS network by using a function for interworking the VLAN network 12 and the MPLS network 16 and an operation for decapsulating the MPLS encapsulated ATM2 into the ATM cells will be described.
First, an operation in which an ATM cell is MPLS encapsulated will be described.
When the ATM cell is input to the PWE-compatible device 9, it is transmitted to the VLAN network 12 as Ethernet-encapsulated ATM1 according to RFC4717.
The Ether-encapsulated ATM 1 is input to the aggregation device 10 through the VLAN interface unit 17. In the input signal, the interwork function unit 19 obtains the MPLS header unit 6 by looking at the C-Tag unit 7 in the Ethernet header unit 4 and performs encapsulation header conversion. The MPLS encapsulated ATM 2 is transmitted to the MPLS network 16 through the MPLS interface unit 18.

Next, the operation of decapsulating the MPLS encapsulated ATM 2 shown in FIG. 1 into an ATM cell will be described.
The MPLS encapsulated ATM-2 is input from the MPLS interface unit 18 of the aggregation device 10. In the input signal, the interwork function unit 19 obtains the Ethernet header unit 4 by looking at the VC-Label unit 8 in the MPLS header 6 and performs encapsulation header conversion. The Ethernet header encapsulation ATM 1 is transmitted to the VLAN network 12 through the VLAN interface unit 17. The Ethernet-encapsulated ATM 1 is input to the VLAN interface unit 14 of the PWE device 9 and is transmitted as an ATM cell from the ATM interface unit 13 to the access network 11 according to RFC4717.

  In FIG. 1, the Ethernet-encapsulated ATM 1 refers to the C-Tag portion 7 in the Ethernet header portion 4 having the VID, acquires the MPLS header portion 6, and becomes the MPLS-encapsulated ATM 2. The MPLS encapsulated ATM 2 acquires the Ethernet header part 4 from the VC-Label part 8 in the MPLS header part 6 and becomes the Ethernet encapsulated ATM 1.

  In this way, the data transfer system between the access network and the MPLS network according to the present invention does not change the ATM cell to MPLS encapsulated ATM2, but converts the header from Ether encapsulated ATM1. It is possible to connect the VLAN network 12 and the MPLS network 16 which are configured by access-type PWE apparatuses that do not have the network.

  That is, the access network-MPLS network data transfer system according to the present invention uses a conventional VLAN network instead of replacing an access PWE-compatible device having no MPLS function with an access PWE device having an MPLS function. By installing a device with a function for interworking the VLAN network and the MPLS network on the aggregation side, it is not necessary to operate a large number of protocols necessary for operating MPLS, and the man-hours for development and evaluation are reduced. It is possible to construct an MPLS network.

  In addition, the data transfer system between the access network and the MPLS network according to the present invention acquires the MPLS header from the C-Tag in the Ethernet header if it is ATM, and acquires the MPLS header from the ECID in the Ethernet header if it is TDM. Therefore, the bandwidth of the ether header can be effectively used instead of the ATM / TDMoverEtheroverMPLS packet.

<Effect>
As described above, in the present invention, it is possible to perform header conversion of the Ethernet-encapsulated ATM 1 using the function of interworking the VLAN network 12 and the MPLS network 16, so that it is compatible with an access system PWE that does not have an MPLS function. Since it is not necessary to replace the device with an access PWE compatible device having an MPLS function, the ATM line can be introduced into the MPLS network at a low cost. Also, by acquiring the MPLS header from the Ethernet header, it is possible to effectively use the bandwidth for the Ethernet header, instead of being an ATMoverEtheroverMPLS packet.

<Other embodiments>
As another embodiment of the present invention, an ATM cell can be realized as a TDM frame.
FIG. 3 is an explanatory diagram showing a state of data conversion in another embodiment of the data transfer system between the access network and the MPLS network according to the present invention.
In FIG. 3, the ATM cell (without error control) 3 in FIG. 1 is replaced with a TDM frame 22, Ethernet-encapsulated ATM1 is replaced with Ethernet-encapsulated TDM20, and MPLS-encapsulated ATM2 is replaced with MPLS-encapsulated TDM22.

That is, the Ethernet encapsulated TDM (TDMoE) 20 includes an Ethernet header section 23, a TDMData 22, and an FCS section 24.
The Ether Encapsulated TDM (TDMoE) 20 includes a destination MAC address, a transmission source MAC address, an S-Tag (Service-Tag) portion, a Type, an ECID 26, a Reserve, and a Control.
The MPLS header section 25 is composed of a destination MAC address, a transmission source MAC address, Type, Tunnel-LABEL1, VC-LABEL27, and Control.

FIG. 4 is a conceptual diagram showing another embodiment of the data transfer system between the access network and the MPLS network according to the present invention.
In FIG. 4, the ATM interface unit 13 of FIG. 2 is replaced with a TDM interface unit 32.

First, an operation in which a TDM frame is MPLS encapsulated will be described.
When the TDM frame is input to the PWE-compatible device 28, it is transmitted to the VLAN network 31 as an Ethernet-encapsulated TDM 20 in accordance with RFC4553 and RFC5086. The Ethernet-encapsulated TDM 20 is input to the aggregation device 29 through the VLAN interface unit 36. The input signal is subjected to the interwork function unit 38 by looking at the ECID unit 26 in the Ethernet header unit 23 to acquire the MPLS header unit 25 and perform the encapsulation header conversion.
The MPLS encapsulated TDM 21 is transmitted to the MPLS network 35 through the MPLS interface unit 37.

Next, an operation in which the MPLS-encapsulated TDM 21 is decapsulated into a TDM frame will be described.
The MPLS encapsulated TDM 21 is input from the MPLS interface unit 37 of the aggregation device 29. In the input signal, the interwork function unit 38 sees the VC-Label unit 27 in the MPLS header unit 25, acquires the Ethernet header unit 23, and performs encapsulation header conversion.
The Ethernet header encapsulated TDM 20 is transmitted to the VLAN network 31 through the VLAN interface unit 36. The Ethernet-encapsulated TDM 20 is input to the VLAN interface unit 33 of the PWE device 28, and is transmitted as a TDM frame from the TDM interface unit 32 to the access network 30 in accordance with RFC4553 / RFC5086.

  As described above, in the present embodiment, since the ether-encapsulated TDM 20 can perform header conversion using the function 38 for interworking the VLAN network 31 and the MPLS network 35, it has an MPLS function. Since it is not necessary to replace an access-related PWE compatible device with an access-related PWE compatible device having an MPLS function, the TDM line can be introduced into the MPLS network at a low cost. Also, by acquiring the MPLS header from the Ethernet header, it is possible to effectively use the bandwidth for the Ethernet header, not the TDMoverEthernet MPLS packet.

<Program>
The access network-MPLS network data transfer system of the present invention described above is realized by a program that causes a computer to execute processing. Examples of the computer include general-purpose computers such as personal computers and workstations, but the present invention is not limited to this. Therefore, as an example, a case where the present invention is realized by a program will be described below.

As a program, for example, in the system shown in FIG.
In the computer of the aggregation device 10 connected to the VLAN network 12 and the MPLS network 16,
(1) A procedure in which the MPLS interface unit 18 transmits and receives signals to and from the MPLS network 16,
(2) A procedure in which the interwork function unit 19 converts Ether-encapsulated ATM1 to MPLS-encapsulated ATM2 and MPLS-encapsulated ATM2 to Ether-encapsulated ATM1.
(3) a procedure in which the VLAN interface unit 14 transmits and receives signals to and from the VLAN network 12;
(4) In the computer of the PWE device 9 connected to the access network 11 and the VLAN network 12,
(5) a procedure in which the ATM interface unit 13 transmits and receives signals to and from the access network 11;
(6) Procedure for the VLAN interface unit 14 to send and receive signals to and from the VLAN network 12,
(7) A procedure in which the Ethernet encapsulation unit 15 performs Ethernet encapsulation for placing the ATM cell 3 on the VLAN network 12, and decapsulation for placing the Ethernet encapsulation ATM1 on the ATM network 11 of the ATM access system.
The program which performs is mentioned.

In the system shown in FIG.
In the computer of the aggregation device 29 connected to the VLAN network 31 and the MPLS network 35,
(a) a procedure in which the MPLS interface unit 37 transmits and receives signals to and from the MPLS network 35;
(b) The interwork function unit 38 converts the Ethernet-encapsulated TDM into the MPLS-encapsulated TDM and the MPLS-encapsulated TDM into the Ethernet-encapsulated TDM.
(c) a procedure in which the VLAN interface unit 36 transmits and receives signals to and from the VLAN network 31;
(d) To the computer of the PWE device 28 connected to the access network 30 and the VLAN network 31,
(e) a procedure in which the TDM interface unit 32 transmits and receives signals to and from the access network 30;
(f) a procedure in which the VLAN interface unit 33 transmits and receives signals to and from the VLAN network 31;
(g) A program that causes the Ethernet encapsulation unit 34 to execute a procedure for performing Ethernet encapsulation for placing the TDM frame on the VLAN network 31 and decapsulation for placing the Ether-encapsulated TDM on the ATM access network 30. Can be mentioned.
As a result, the access network-MPLS network data transfer system of the present invention can be realized anywhere as long as there is a computer environment capable of executing the program.

<Storage medium>
Such a program may be stored in a computer-readable storage medium.
Here, examples of the storage medium include a computer-readable storage medium such as a CD-ROM (Compact Disc Read Only Memory), a flexible disk (FD), and a CD-R (CD Recordable), a flash memory, and a RAM (Random). Examples include semiconductor memories such as Access Memory (ROM), Read Only Memory (ROM), and FeRAM (ferroelectric memory), and HDD (Hard Disc Drive).

  The above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention. is there.

It is explanatory drawing which shows the mode of the conversion of the data in one Embodiment of the data transfer system between the access type network-MPLS networks concerning this invention. 1 is a conceptual diagram showing an embodiment of a data transfer system between an access network and an MPLS network according to the present invention. It is explanatory drawing which shows the mode of the conversion of the data in other embodiment of the data transmission system between the access type network-MPLS networks concerning this invention. It is a conceptual diagram which shows other embodiment of the data transmission system between the access type network-MPLS network concerning this invention. 1 is a conceptual diagram of a data transfer system related to the present invention.

Explanation of symbols

1 Ether Encapsulated ATM
2 MPLS encapsulated ATM
3 ATM cell 4 Ether header part 5 FCS part 6 MPLS header part 7 C-Tag part 8 VC-Label part

Claims (9)

  An access system comprising: an aggregation device connected to a VLAN network and an MPLS network and having an interwork function; and an access network and a PWE device connected to the VLAN network and having an ether encapsulation function. Network-MPLS network data transfer system. The aggregation device includes an MPLS interface unit that transmits and receives signals to and from the MPLS network, an interwork function unit that converts Ethernet-encapsulated ATM to MPLS-encapsulated ATM, and MPLS-encapsulated ATM to Ethernet-encapsulated ATM; A VLAN interface unit that transmits and receives signals to and from the VLAN network;
The PWE device includes an ATM interface unit for transmitting / receiving signals to / from the access network, a VLAN interface unit for transmitting / receiving signals to / from the VLAN network, and an Ethernet capsule for placing ATM cells on the VLAN network. 2. An access network-MPLS network data transfer system according to claim 1, further comprising an Ethernet encapsulation unit for performing decapsulation for placing the ATM-encapsulated ATM on the ATM access network. The ether-encapsulated ATM has an ether header part, an ATM cell, and an FCS part,
3. The access network-MPLS network data transfer system according to claim 2, wherein the MPLS-encapsulated ATM includes an MPLS header part, an ATM cell, and an FCS part. The aggregation device includes an MPLS interface unit that transmits and receives signals to and from the MPLS network, an interwork function unit that converts Ethernet-encapsulated TDM to MPLS-encapsulated TDM, and MPLS-encapsulated TDM to Ethernet-encapsulated TDM, A VLAN interface unit that transmits and receives signals to and from the VLAN network;
The PWE device includes a TDM interface unit that transmits / receives signals to / from the access network, a VLAN interface unit that transmits / receives signals to / from the VLAN network, and an Ethernet capsule for placing a TDM cell on the VLAN network. 2. An access network-MPLS network data transfer system according to claim 1, further comprising an Ethernet encapsulation unit for performing decapsulation for placing the EDM-encapsulated TDM on an ATM access network. The Ether-encapsulated TDM has an Ether header part, TDM data, and an FCS part,
5. The access network-MPLS network data transfer system according to claim 4, wherein the MPLS-encapsulated TDM includes an MPLS header part, TDM data, and an FCS part. On the aggregation device side connected to the VLAN network and the MPLS network,
Send and receive signals to and from the MPLS network;
Convert Ether-encapsulated ATM to MPLS-encapsulated ATM, MPLS-encapsulated ATM to Ether-encapsulated ATM,
Send and receive signals to the VLAN network,
On the PWE device side connected to the access network and VLAN network,
Send and receive signals to and from the access network,
Send and receive signals to the VLAN network,
A data transfer method between an access network and an MPLS network, comprising performing Ethernet encapsulation for placing an ATM cell on the VLAN network and decapsulation for placing the Ether-encapsulated ATM on an ATM access network. On the aggregation device side connected to the VLAN network and the MPLS network,
Send and receive signals to and from the MPLS network;
Convert Ether-encapsulated TDM to MPLS-encapsulated TDM, MPLS-encapsulated TDM to Ether-encapsulated TDM,
Send and receive signals to the VLAN network,
On the PWE device side connected to the access network and VLAN network,
Send and receive signals to and from the access network,
Send and receive signals to the VLAN network,
A data transfer method between an access network and an MPLS network, comprising performing Ethernet encapsulation for placing a TDM frame on the VLAN network, and decapsulation for placing the Ether-encapsulated TDM on an ATM access network. In the computer of the aggregation device connected to the VLAN network and the MPLS network,
A procedure in which an MPLS interface unit transmits and receives signals to and from the MPLS network;
A procedure in which the interworking function unit converts the Ether-encapsulated ATM into the MPLS-encapsulated ATM and the MPLS-encapsulated ATM into the Ether-encapsulated ATM;
A procedure in which the VLAN interface unit transmits and receives signals to and from the VLAN network;
In the computer of the PWE device connected to the access network and VLAN network,
A procedure in which an ATM interface unit transmits and receives signals to and from the access network;
A procedure in which the VLAN interface unit transmits and receives signals to and from the VLAN network;
A procedure in which the Ethernet encapsulation unit performs Ethernet encapsulation for placing ATM cells on the VLAN network, and decapsulation for placing Ether-encapsulated ATM on an ATM access network;
A program characterized by having executed. In the computer of the aggregation device connected to the VLAN network and the MPLS network,
A procedure in which an MPLS interface unit transmits and receives signals to and from the MPLS network;
A step in which the interworking function unit converts the Ether-encapsulated TDM into the MPLS-encapsulated TDM and the MPLS-encapsulated TDM into the Ether-encapsulated TDM
A procedure in which the VLAN interface unit transmits and receives signals to and from the VLAN network;
In the computer of the PWE device connected to the access network and VLAN network,
A procedure in which the TDM interface unit transmits and receives signals to and from the access network;
A procedure in which the VLAN interface unit transmits and receives signals to and from the VLAN network;
A program characterized in that an Ethernet encapsulation unit executes a procedure for performing Ethernet encapsulation for placing a TDM frame on the VLAN network and decapsulation for placing an Ether-encapsulated TDM on a TDM access network.

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