KR20050050467A - Apparatus and method for interfacing tdm circuit traffic with data traffic - Google Patents

Abstract

An apparatus for interfacing TDM line traffic and IP data traffic according to the present invention includes: a switch fabric unit for transmitting a frame processed by a predetermined line card to another line card; Ethernet that transmits the frame by setting the output line card and output port corresponding to the VLAN ID assigned to the received Ethernet frame, and also transmits the IP data traffic through the corresponding output port corresponding to the VLAN ID included in the Ethernet frame. Packet interface card; And setting the output line card and the output port corresponding to the VLAN ID assigned to the Ethernet frame extracted from the received SDH / SONET frame to transmit the frame, and further, the frame received through the switch fabric unit corresponding to the corresponding VLAN ID. And a TDM packet interface card which is included in an SDH / SONET frame having a VC (Virtual Concatenation) ID and transmitted on a TDM line.

 According to the present invention, by applying a port-based VLAN scheme to a frame between a TDM circuit traffic interface and an IP data traffic interface, a frame can be efficiently transmitted without a separate complicated device for connecting different interfaces between traffic.

Description

Apparatus and method for interfacing TDM circuit traffic with data traffic}

The present invention relates to an apparatus and method for interfacing time division multiplexing (TDM) line traffic and IP data traffic. In particular, TDM line traffic of SDH / SONET frames and IP data traffic of Ethernet frames by applying a port-based VLAN scheme. An apparatus and method for interfacing TDM circuit traffic and IP data traffic capable of transmitting frames between them are provided.

In general, an interface between a data network related to the Internet and a LAN and a TDM applied to a large amount of circuit traffic is required. However, in the related art, a separate interface for connecting a different interface in the middle to transmit a frame between the TDM circuit traffic and IP data traffic is required. The disadvantage is that the device must use the complex manner required.

For example, a conventional interface device and method for directly applying Ethernet to a physical channel (Patent Publication No. 2001-0085853) are LAPS-SDH (Link Access Procedure-SDH) for applying MAC frame of Ethernet directly to SDH / SONET. ) And a complex structure for handling Ethernet frames through this LAPS encapsulation.

The technical problem to be achieved by the present invention can be transmitted as a simpler structure through the input and output ports of the line card corresponding to the VLAN ID by applying a port-based VLAN (Virtual LAN) method between the TDM line traffic and IP data traffic An apparatus and method for interfacing TDM circuit traffic with IP data traffic is provided.

An apparatus for interfacing TDM circuit traffic and IP data traffic for achieving the above technical problem of the present invention,

A switch fabric unit connected to a plurality of line cards and configured to transmit a frame processed by a predetermined line card to another set line card;

A VLAN ID is assigned to a received Ethernet frame, the frame is transmitted to a corresponding TDM packet interface card according to the VLAN ID, and through the corresponding output port corresponding to the VLAN ID included in the Ethernet frame received through the switch fabric unit. An Ethernet packet interface card for transmitting IP data traffic; And

A VLAN ID is assigned to an Ethernet frame extracted from the received SDH / SONET frame, the corresponding output line card and an output port are set to transmit the frame, and the frame received through the switch fabric unit corresponds to the corresponding VLAN ID. And a TDM packet interface card which is included in an SDH / SONET frame having a VC (Virtual Concatenation) ID and transmitted on a TDM line.

The Ethernet packet interface card may include an Ethernet transceiver unit for transmitting and receiving the Ethernet frame through the Ethernet network, a frame multiplexing / demultiplexing unit for multiplexing or demultiplexing a plurality of Ethernet frames transmitted and received, and the multiplexing. A first network processor for performing a packet classification function on a frame, a lookup function of a line card and an input / output port corresponding to a VLAN ID, a forwarding function of a frame, and a header conversion function, and corresponding information received from the first network processor; It characterized in that it comprises a first switch interface for transmitting the frame to the switch fabric unit using.

In addition, the TDM packet interface card includes a transceiver for transmitting and receiving SDH / SONET frames through a TDM scheme, an EoS processor for inserting and extracting Ethernet frames from SDH / SONET frames, and a packet for the input multiplexed frame. A second network processor unit performing a classification function, a lookup function of the line card and an input / output port for a VLAN ID, a frame forwarding function, and a header conversion function, and the corresponding information received from the second network processor unit. And a second switch interface unit for transmitting the frame to the switch fabric unit.

The first network processor may include a look-up table for a corresponding VC ID, line card number, and input / output port number according to each VLAN ID.

The second network processor may include a lookup table for the corresponding VC ID, line card number, and input / output port number according to each VLAN ID.

At least one first line card which is an Ethernet packet interface card connected to an Ethernet network for achieving another technical problem of the present invention, at least one second line card which is a TDM packet interface card connected with a TDM scheme circuit, and each of the cards Method for interfacing the TDM line traffic and IP data traffic in a device having a switch fabric unit connected to the

It assigns a VLAN ID assigned to an input port according to whether a VLAN ID exists in the Ethernet frame received as IP data traffic, and sets an output second line card and an output port corresponding to the corresponding VLAN ID to connect the Ethernet frame to the corresponding second frame. Transmitting to a line card; and

Converting the transmitted frame into a GFP frame in the second line card, and including the same in an SDH / SONET frame of a channel having a VC ID corresponding to the VLAN ID to transmit to TDM circuit traffic; And

Extracting the Ethernet frame from the SDH / SONET frame received through the TDM scheme and assigning the VLAN ID to the input port if there is no VLAN ID, and setting the output port of the first line card corresponding to the VLAN ID. ;Wow

And outputting and transmitting the received Ethernet frame to the output port of the corresponding first line card.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a TDM circuit traffic and IP data traffic interface device according to the present invention in a next generation integrated delivery system.

In FIG. 1, an apparatus for interfacing TDM circuit traffic and data traffic includes a switch fabric unit 120 for transmitting and receiving a frame processed by a predetermined line card connected to a plurality of line cards to another set line card. , A line card with Ethernet connection function for transmitting and receiving IP data traffic.If there is no VLAN ID in the Ethernet frame received from the Ethernet network, a VLAN ID assigned to the input port is assigned, and a corresponding output is output according to the VLAN ID. Determining a line card and an output port to transmit the Ethernet frame to the switch fabric, and also to transmit the IP data traffic to the output port determined by the VLAN ID included in the Ethernet frame received through the switch fabric unit 120 GPIH (Gigabit Ethernet Packet Interface Hardware) section 100, and also provides TDM line traffic A line card with SDH / SONET connection for receiving. If there is no VLAN ID in the Ethernet frame received from the Ethernet network, the frame is assigned with the VLAN ID assigned to the input port, and corresponding to the VLAN ID in the lookup table. The output line card and the output port are determined to transmit the Ethernet frame to the switch fabric unit 120, and the IP data to the output port determined by the VLAN ID included in the Ethernet frame received through the switch fabric unit 120. A TPIH (TDMH Packet Interface Hardware) unit 110 for transmitting traffic is provided.

The GPIH unit 100 processes the first switch interface unit 130 having a connection function with the switch fabric unit 120, the first network processor unit 140 having a lookup and forwarding function of the frame, and a plurality of Ethernet frames. To this end, the frame multiplexer / demultiplexer 150 has multiplexing and demultiplexing functions, and an Ethernet transceiver 160 having an Ethernet frame transmitting / receiving function.

The Ethernet transceiver 160 in the GPIH unit 100 functions to transmit and receive Ethernet frames through an Ethernet network, and converts a plurality of input Ethernet frames from an optical signal to an electrical signal to multiplex and demultiplex frames. Transmit to unit 150. The frame multiplexer and demultiplexer 150 multiplexes a plurality of Ethernet frames received from the Ethernet transceiver 160 and transmits the multiplexed Ethernet frames to the first network processor 140. The first network processor 140 performs a packet classification function, a lookup function of a line card and an input / output port corresponding to a VLAN ID, a frame forwarding function, and a header conversion function by using the received multiplexed frame. The line card number determined by the function and the input / output port number information are added and transmitted to the first switch interface unit 130. The first switch interface unit 130 transmits the frame to the switch fabric unit 120 using the corresponding information received from the first network processor unit 100.

In addition, the TPIH unit 110 includes an SDH transceiver 180 for transmitting and receiving an SDH / SONET frame through a TDM scheme, an EoS processor 170 for inserting and extracting an Ethernet frame from the SDH / SONET frame, A second network processor 142 for performing packet classification, lookup of the line card and input / output ports for VLAN IDs, forwarding function of the frame and header conversion for the input multiplexed frame, and the second network The second switch interface unit 132 transmits the frame to the switch fabric unit 120 by using the corresponding information received from the processor unit 142.

The SDH transceiver 180 of the TPIH unit 110 converts a plurality of SDH / SONET frames input to the TPIH unit 110 from the TDM-based circuit into an electrical signal and transmits them to the EoS processor 170. do. The EoS processor 170 extracts an Ethernet frame from the plurality of SDH / SONET frames received from the SDH transceiver 180 and then transfers the Ethernet frame to the second network processor 142. The second network processor 142 performs a lookup function of a line card and an input / output port corresponding to a VLAN ID, a forwarding function of a frame, a header conversion function, and the like using a multiplexed frame, and a header conversion function. And adds the line card number and the input / output port number information determined according to the VLAN ID, and transmits them to the second switch interface unit 132. The second switch interface unit 132 transmits the frame to the switch fabric unit 120 using the corresponding information received from the second network processor unit 142.

FIG. 2 is a flowchart illustrating main frame processing when transmitting a frame from the GPIH unit 100 to the TPIH unit 110 of the apparatus shown in FIG. 1.

In the following description, a frame processed by the TPIH unit 110 in each GPIH unit 100 basically assumes an Ethernet frame using a Port-based VLAN method. The steps in which the frame is processed are as follows. The GPIH unit 100 extracts and analyzes the information from the Ethernet frame input from the Ethernet network (step 210). It is checked if there is a VLAN ID in the Ethernet frame (step 220). If the Ethernet frame does not have a VLAN ID, a default VLAN ID assigned to the input port is assigned, and a VLAN ID is extracted from the Ethernet frame having the VLAN ID (steps 230 and 240). The corresponding output line card and output port are determined by referring to the lookup table with the corresponding VLAN ID included in the Ethernet frame (step 250). After transferring the frame to the corresponding output line card, the Ethernet frame is converted into a Generic Framing Procedure (GFP) frame (steps 260 and 270). The converted GFP frame is included in the SDH / SONET frame of the channel having the VC (Virtual Concatenation) ID corresponding to the VLAN ID using the EoS scheme and transmitted as TDM circuit traffic (steps 280 and 290).

3 is a flowchart illustrating frame processing when transmitting a frame from the TPIH unit 110 to the GPIH unit 100 of the apparatus shown in FIG. 1.

An Ethernet frame is extracted from the SDH / SONET frame received through the TDM scheme using the EoS scheme (step 310). Information is extracted from the extracted Ethernet frame and analyzed (step 320). It is checked if there is a VLAN ID in the Ethernet frame (step 330). If the Ethernet frame does not have a VLAN ID, a default VLAN ID assigned to the input port is assigned, and a VLAN ID is extracted from the Ethernet frame (steps 340 and 350). The output line card and the output port are determined using the extracted VLAN ID (step 360). The Ethernet frame is transmitted to the corresponding line card through the switch fabric unit 120 (step 370). The frame is forwarded to the output port determined by the VLAN ID of the Ethernet frame, and the Ethernet frame is transmitted as IP data traffic (steps 380 and 390).

4 is a block diagram of a lookup table provided in each of the first and second network processors 140 and 142 in the apparatus of FIG. 1 and referred to according to a VLAN ID.

The VLAN ID lookup table consists of VLAN ID (51), VC ID (52), line card number (53), input / output port number (54), etc. VLAN ID (51) is included in the Ethernet frame so that TPIH The VC ID 52, line card number 53, and input / output port number 54, etc., corresponding to the case where the data is transmitted to the SDH / SONET frame, and the corresponding virtual channel through the line card and the port. To be printed.

As described above, the present invention applies a port-based VLAN scheme to a frame between a TDM circuit traffic interface and an IP data traffic interface so that an input / output line card number, a VC ID, and an input / output port number are set corresponding to each VLAN ID. Thus, the frame can be efficiently transmitted without having a separate complicated device for connecting different interfaces between traffic.

1 is a block diagram of a TDM circuit traffic and IP data traffic interface device according to the present invention in a next generation integrated delivery system.

FIG. 2 is a flowchart illustrating main frame processing when transmitting a frame from a GPIH unit to a TPIH unit of the apparatus shown in FIG. 1.

3 is a flowchart illustrating frame processing when transmitting a frame from a TPIH unit to a GPIH unit of the apparatus shown in FIG. 1.

FIG. 4 is a diagram illustrating a lookup table included in each of the first and second network processors in the apparatus of FIG. 1 and referenced according to a VLAN ID.

<Explanation of symbols for the main parts of the drawings>

100: GPIH part 110: TPIH part

120: switch fabric portion 130: the first switch interface portion

132: second switch interface unit 140: first network processor unit

142: second network processor unit 150: frame multiplexing / demultiplexing unit

160: Ethernet transceiver 170: EoS processing unit

180: SDH transceiver

Claims (7)

A switch fabric unit connected to a plurality of line cards and configured to transmit a frame processed by a predetermined line card to another set line card; A VLAN ID is assigned to a received Ethernet frame, the frame is transmitted to a corresponding TDM packet interface card according to the VLAN ID, and through the corresponding output port corresponding to the VLAN ID included in the Ethernet frame received through the switch fabric unit. An Ethernet packet interface card for transmitting IP data traffic; And A VLAN ID is assigned to an Ethernet frame extracted from the received SDH / SONET frame, the corresponding output line card and an output port are set to transmit the frame, and the frame received through the switch fabric unit corresponds to the corresponding VLAN ID. And a TDM packet interface card included in the SDH / SONET frame having the VC ID and transmitted to the TDM circuit. The Ethernet packet interface card of claim 1, further comprising: an Ethernet transceiver unit for transmitting and receiving the Ethernet frame through the Ethernet network, and a frame multiplexing / demultiplexing unit for multiplexing or demultiplexing a plurality of Ethernet frames. And a first network processor for performing a packet classification function, a lookup function of a line card and an input / output port corresponding to a VLAN ID, a forwarding function of a frame, and a header conversion function with respect to the multiplexed frame. And a first switch interface unit for transmitting the frame to the switch fabric unit by using the received corresponding information. The TDM packet interface card of claim 1, wherein the TDM packet interface card comprises: a transceiver for transmitting and receiving an SDH / SONET frame through a TDM scheme, an EoS processor for inserting and extracting an Ethernet frame from the SDH / SONET frame, and an input multiplexer. A second network processor for performing a packet classification function, a lookup function of the line card and an input / output port for a VLAN ID, a forwarding function of a frame, and a header conversion function for a frame, and the corresponding information received from the second network processor unit; And a second switch interface unit for transmitting the frame to the switch fabric unit by using the TDM circuit traffic and IP data traffic. The look-up table for the ID, line card number, VC ID for input / output port number, line card number, and input / output port number according to each VLAN ID. And TDM circuit traffic and IP data traffic. 3. The apparatus of claim 2, wherein the second network processor unit has a corresponding VC lookup table according to each VLAN ID. At least one first line card which is an Ethernet packet interface card connected with an Ethernet network, at least one second line card which is a TDM packet interface card connected with a TDM scheme circuit, and a switch fabric unit connected to each card. How to interface TDM line traffic and IP data traffic, It assigns a VLAN ID assigned to an input port according to whether a VLAN ID exists in the Ethernet frame received as IP data traffic, and sets an output second line card and an output port corresponding to the corresponding VLAN ID to connect the Ethernet frame to the corresponding second frame. Transmitting to a line card; Converting the transmitted frame into a GFP frame in the second line card, and including the same in an SDH / SONET frame of a channel having a VC ID corresponding to the VLAN ID to transmit to TDM circuit traffic; And Extracting the Ethernet frame from the SDH / SONET frame received through the TDM scheme and assigning the VLAN ID to the input port if there is no VLAN ID, and setting the output port of the first line card corresponding to the VLAN ID. ; Outputting the received Ethernet frame to the output port of the corresponding first line card and transmitting the received Ethernet frame; and transmitting the received Ethernet frame to the IP data traffic. 7. The method of claim 6, wherein the corresponding line card, input / output port, and VC ID corresponding to the VLAN ID are set using a lookup table.