KR20030010969A - Wavelength Sharing ONIC of DWDM Token Ring Network and Method therefor - Google Patents

Abstract

PURPOSE: A device of a wavelength-shared type ONIC(Optical Network Interface Card) of a token ring network using DWDM(Dense Wavelength Division Multiplexing) and a method thereof are provided to allow ONICs sharing wavelength to control wavelength use time and share wavelength receiving, without collision between the ONICs, so as to extend subscriber channels and increase a bandwidth utilization rate. CONSTITUTION: A wavelength token management module(307) manages token information classifying a plurality of ONICs, to decide the use sequence of identical wavelength of optical signals. A jumbo packet frame generation module(313) converts data to be transmitted into a jumbo packet frame composed of at least one packet. A jumbo frame control module(309) receives a size level of the generated jumbo packet frame from the jumbo packet frame generation module(313) and receives the token information of an ONIC which is to use the identical wavelength of optical signals next from the wavelength token management module(307). A jumbo preamble frame generation module(311) receives the information on the packet size and the token information of the ONIC which is to use the identical wavelength of optical signals next from the jumbo frame control module(309), to generate a jumbo preamble frame. And optical transmission and receiving modules(101,109) receive the jumbo preamble frame and the jumbo packet frame respectively from the jumbo preamble frame generation module(311) and a jumbo packet frame generation module(313), to convert the received frame into predetermined wavelength of optical signals and transmit the converted signals to the network.

Description

Wavelength-sharing optical network interface card device of dense wavelength division multiplexing token ring network and method therefor {Wavelength Sharing ONIC of DWDM Token Ring Network and Method therefor}

The present invention relates to an optical network interface card (ONIC) using a fixed laser diode and a photon diode in a token ring network using dense wavelength division multiplexing (DWDM). The present invention relates to an optical network interface card device and a method for maximizing wavelength utilization of an optical transmission line by granting wavelength sharing function to an ONIC in a DWDM optical network so that multiple ONICs can share a relatively large optical wavelength with each other. will be.

1 is a block diagram showing a structure of a conventional ONIC, and as shown in the drawing, the conventional ONIC includes an optical receiving module 101, a receiving electronic physical layer module 103, a MAC layer 105, and a transmitting electronic physical layer. It consists of a module 107 and an optical transmission module 109.

The physical layer modules 103 and 107 are capable of inserting / extracting predetermined wavelengths, converting optical signals to electrical signals, synchronizing functions, clock recovery functions, encoding / decoding functions, and interfaces with higher MAC layers 105. It is in charge of the function and interface function with the lower optical line.

The MAC layer 105 performs an interface function with a host and an encapsulation / decapsulation function of a packet.

ONIC, which uses conventional fixed laser and photon diodes, does not have a structure that can share the same wavelength. This structure has a limitation in the number of subscribers due to the limitation on the number of wavelengths provided on one optical path.

For example, if there are n wavelengths on one DWDM optical line, only up to n optical subscribers can access the network using ONICs that do not share wavelengths.

Accordingly, the present invention has been made to solve the above problems, and the present invention provides an optical network interface card apparatus in which a plurality of plural connections are connected to a wavelength division multiplex network having a token ring structure to share an optical signal of the same wavelength. It is an object of the present invention to provide an optical network interface card device and a method thereof, which can extend subscriber channels and increase bandwidth utilization by allowing ONICs to share wavelength reception and wavelength reception in which wavelengths can be used without collision.

Those skilled in the art to which the present invention pertains can easily recognize other objects and advantages of the present invention from the drawings, the detailed description of the invention, and the claims.

1 is a block diagram showing the structure of a conventional ONIC;

2 is a schematic diagram showing a DWDM ring network structure to which an ONIC is applied according to the present invention;

3 is a block diagram showing the structure of an ONIC according to the present invention;

4 is a schematic diagram showing the structure of the partial wavelength selective insertion / extraction filter of FIG.

5 is a frame structure diagram of a jumbo frame transmitted and received according to the present invention.

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

101: optical receiving module 103: receiving electronic physical layer module

105: MAC layer 107: transmit electronic physical layer module

109: optical transmission module 307: wavelength token management module

301: partial wavelength selective insertion / extraction filter module

407: acoustic wave generator 411: wavelength selective filter

In order to achieve the above object, the present invention provides a plurality of optical network interface card devices in which a plurality of wavelength division multiplexed networks of a token ring structure are connected to share an optical signal having the same wavelength. A wavelength token management unit for determining the order in which the optical signal of the same wavelength is used by managing token information for distinguishing the data, a jumbo packet frame generation unit for converting data to be transmitted into a jumbo packet frame composed of at least one packet, and the jumbo packet frame A jumbo frame control unit for receiving the length information of the generated jumbo packet frame from a generation unit and receiving token information of an optical network interface card device to use the optical signal of the same wavelength next from the wavelength token management unit; tile Jumbo preamble frame generation unit and jumbo preamble frame generation unit and jumbo packet frame generation receiving length information and token information of an optical network interface card device that will use the optical signal of the same wavelength next to generate a jumbo preamble frame And an optical transmitter for receiving the jumbo preamble frame and the jumbo packet frame, converting the jumbo preamble frame into an optical signal having a predetermined wavelength, and transmitting the same to an optical network, wherein the jumbo preamble frame currently uses the optical signal having the same wavelength. Token information of the optical network interface card device, and next, token information of the optical network interface card device to use the optical signal of the same wavelength and length information of the jumbo frame, wherein the jumbo packet frame is transmitted by the jumbo packet frame. Become optical network It provides an optical network interface card device comprising the data to be transmitted and the interface card device information.

In order to achieve the above object, the present invention is directed to a wavelength sharing method in the network by an optical network interface card device, in which a plurality of token ring structured wavelength division multiplex networks are connected to share an optical signal of the same wavelength. The method of claim 1, wherein the first step of determining the order of the optical signal of the same wavelength based on the token information for distinguishing the plurality of optical network interface card device, converting the data to be transmitted to a jumbo packet frame consisting of at least one packet A second step of generating a jumbo preamble frame based on the length information of the generated jumbo packet frame and next token information of an optical network interface card device that will use the optical signal of the same wavelength; and the jumbo preamble The frame is converted into an optical signal having a predetermined wavelength to And a fifth step of transmitting the jumbo packet frame to an optical signal having a predetermined wavelength and transmitting the converted signal to the network, wherein the jumbo preamble frame currently uses the optical signal having the same wavelength. Token information of an optical network interface card device and next token information of an optical network interface card device to use the optical signal of the same wavelength and length information of the jumbo frame, wherein the jumbo packet frame is to be transmitted. It provides a wavelength sharing method comprising optical network interface card device information and data to be transmitted.

According to the present invention, since ONICs sharing wavelengths can share timing control and wavelength reception, which can use wavelengths without collision, when n wavelengths are shared by n ONICs, n X m optical fibers are provided in one DWDM optical path. Since the subscriber station is accessible, bandwidth utilization can be maximized through wavelength sharing.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same number as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic diagram illustrating a DWDM ring network structure to which an ONIC according to the present invention is applied. As an embodiment, multiple ONICs 201 to 1x sharing a single wavelength in a DWDM ring network structure are provided for convenience of description. A network structure consisting of 207 is shown. ONICs that share a wavelength each have a token value designated by a unique identifier. In FIG. 2, the wavelength token management module 307 (see FIG. 3) for wavelength sharing included in one of the wavelength sharing ONICs (ONIC A, 201) serves as a server, and the remaining ONICs (ONIC B / C / The wavelength token management module 307 for wavelength sharing included in D, 203 through 207 serves as a client.

Types of tokens include unique tokens and public tokens assigned to identify each ONIC, and are managed by the wavelength token management server 201.

The shared token is used by the ONIC sharing the wavelength for the first time to register its token value with the wavelength token management server. If there are n ONICs sharing the wavelength, the number of tokens is n (= number of ONICs) + 1 (= number of shared tokens).

The wavelength sharing ONIC 201-207 registers its token value with the wavelength sharing token management server 201 using the sharing token. The wavelength token management server 201 generates wavelength use order information by using registered token values, and then distributes wavelength use order information.

Client ONICs 201 to 207 receiving the wavelength usage order information use this information to check their transmission order and thereby transmit data without data collision when transmitting data between ONICs 201 to 207 sharing the same wavelength. Can be transmitted.

For example, the wavelength usage order information in FIG. 2 is A → B → C → D → Z, where A, B, C, and D are ONIC A 201, ONIC B 203, ONIC C 205, and A unique token value assigned to each ONIC D 207 and Z means a shared token.

In addition, if the jumbo frame 501 (see FIG. 5) is not received even after a predetermined time elapses through its timer, the wavelength token management server 201 reconfigures wavelength use order information by removing the next token of the last extracted token. Distribute.

For example, the order of tokens managed by the wavelength token management server, that is, the order in which ONICs can use the network in the network-A → B → C → D → Z-Information is known to all ONICs.

The ONIC A 201 specifies that the ONIC B 203 is the next token user, assigns the token value B to the jumbo preamble frame 503 (described below), and transmits the data to the network by putting its data in a packet frame. do.

Then, the ONIC B 203 to which the token value of B is assigned, recognizes that the network can be used by referring to the token information included in the jumbo preamble frame 503.

However, if an error occurs in the ONIC B 203 to which the token value of B is assigned, the jumbo preamble frame 503 displays the token information for the ONIC C 205 to which the token value of C to use the network is next assigned. If you do not generate the token, the token allocation and network usage will cause an error. To prevent this, the wavelength token management server generates the token sequence information by subtracting the problematic token information (C) to all ONICs 201 to 207. Will be resent.

3 is a block diagram showing the structure of an ONIC according to the present invention. As shown in the figure, the ONIC according to the present invention has a wavelength sharing function capable of maximizing the wavelength utilization of the optical transmission line by adding a wavelength sharing function to the conventional ONIC by sharing a plurality of ONIC.

As shown in Fig. 3, the ONIC according to the present invention has wavelengths in addition to the optical transmission / reception modules 101 and 109, the transmission / reception electronic physical layer modules 103 and 107 and the MAC layer 105, which are the same as conventional ONICs. Wavelength token management module 307 for sharing, partial wavelength selective insertion / extraction filter module 301 for sharing wavelength reception, jumbo frame control module 309 for grouping and transmitting multiple packets, and jumbo preamble frame generation Module 311, jumbo packet frame generation module 313, and jumbo frame processing module 303 for processing the received jumbo frames.

The wavelength token management module 307 for sharing wavelengths between ONICs collects / manages / maintains tokens, which are unique identifiers of ONICs that share the same wavelength, and uses wavelength order information for sharing wavelengths among ONICs having unique tokens. Configure / maintain and distribute wavelength usage order information to ONICs sharing the same wavelength (token management server, 201) or receive (token management clients, 203 to 207).

The jumbo frame processing module 303 performs an error check on the jumbo preamble frame 503 (see FIG. 5) and the jumbo packet frame 505 (see FIG. 5) in the received jumbo frame 501, and then checks each receiving buffer. Jumbo preamble buffer (not shown) and jumbo packet buffer (not shown).

In addition, the jumbo frame processing module 303 extracts the token values 507, 509 (see FIG. 5) from the first received jumbo preamble frame 503, and transfers the token values to the jumbo frame control module 309. (511, see FIG. 5) is extracted to operate the transmission timer.

The jumbo frame control module 309 examines the token values 507 and 509 transmitted from the jumbo frame processing module 303 to determine whether to transmit its own. If it is its transmission, the jumbo preamble frame generation module 311 generates a jumbo preamble frame 503, which contains the next token value 507 and jumbo frame length information 511, and sends it to the transmission timer. After the transmission, the jumbo packet frame 505 that groups the packets in the buffer of the jumbo packet frame generation module 313 is transmitted.

The partial wavelength selective insertion / extraction filter module 301 for sharing the wavelength reception extracts only the optical wavelength having the intensity required for optical / electric conversion of the optical wavelength transmitted from any ONIC to all receivable ONICs. It performs a variable extraction function that can pass the remaining light wavelength.

Of course, the partial wavelength selective insertion / extraction filter module 301 may pass all optical wavelengths or extract all optical wavelengths transmitted by the partial wavelength selective insertion / extraction filter module 301.

FIG. 4 is a schematic view showing the structure of the partial wavelength selective insertion / extraction filter module 301 of FIG. 3 and is mainly used in an optical subscriber system, so that it is required to have low cost and excellent loss characteristics and reliability. It is therefore possible to adopt Fiber Bragg Granting (FBG) fabrication technology, which is the easiest and most reliable of existing wavelength filter technologies.

The operation principle is described as an embodiment as follows. When the multi-channel or multi-wavelength optical signal is input to the partial wavelength selective insertion / extraction filter module 301, the wavelength selective filter 411 is encountered. At this time, the optical wave signal matching the resonance wavelength of the filter is output to the extraction terminal 405 and transmitted to the optical receiving module 101.

Most of the wavelength selective filter 411 commercially available until now reflects 99.9% or more of the input signal to the extraction terminal.

However, in the structure proposed in the present invention, after generating acoustic-wave from the acoustic wave generator 407 and inputting the wavelength-selective filter 411 through the acoustic wave transmitter 409, the wavelength-selective type is used. The magnitude of the signal output to the extraction terminal of the filter 411 is changed. According to the magnitude of the changed reflectivity, a part of the intensity of a predetermined wavelength is exited from the partial wavelength selective insertion / extraction filter module 301 to the extraction terminal 405, and the intensity of the unreflected wavelength is It is transmitted through as it is and exits to the output terminal 403. In the case where a part of light intensity of a predetermined wavelength is inserted into the insertion terminal 413, the aforementioned extraction process is reversed.

In this way, ONICs that share a wavelength can perform collision-free transmission operations in packet transmission, and data broadcasting can be performed in one frame transmission to all ONICs sharing the same wavelength reception.

5 is a frame structure diagram of a jumbo frame transmitted and received according to the present invention. As shown in the figure, the jumbo frame 501 has a plurality of packet frames 505 which are data packets grouped in one preamble frame 503 (N in FIG. 5 (Packet1, ..., Packet N)). It consists of). Jumbo preamble frame 503 has a fixed length while jumbo packet frame 505 has a variable length that varies with the size of the data to be transmitted.

The jumbo preamble frame 503 includes token information (CNID, Current Node ID, 509) of the ONIC that generated the jumbo preamble frame, next token information (NNID, Next Node ID, 507) of the ONIC to use the network, and the current. The jumbo frame 501 includes length information (JPFSL, Jumbo Packet Frame Size Level, 511).

The jumbo packet frame 505 includes destination node information (DNID, Destination Node ID, 513) to which the packet frame is to be transmitted, and data information (Payload Data, 515) to be transmitted.

The SPFD field commonly included in the jumbo preamble frame 503 and the jumbo packet frame 505 is a field indicating the start of the frame, and the CRC field is a field used for error checking of data as cyclicredundancy checking.

Each frame is separated by a separation identifier field (IFG).

Referring to FIG. 2 to FIG. 5, a process of transmitting data by sharing a wavelength in a DWDM ring network according to the present invention will be described.

When it is time for ONIC A 201 to transmit data, the jumbo packet frame generation module 313 calculates the length of multiple packets to be transmitted and stored in the transmission buffer therein and transmits related information to the jumbo frame control module 309. To pass on.

The jumbo frame control module 309 transmits the length information corresponding to the length of the jumbo packet frame 505 to be transmitted and the ONIC B 203 token information of the next to be transmitted to the jumbo preamble frame generation module 311.

The jumbo preamble frame generation module 311 receives the received token information (CNID, Current Node ID, 509) of the ONIC A 201, and the token information (NNID, Next Node ID, 507) and jumbo preamble frame 503 is generated based on the length information (JPFSL, Jumbo Packet Frame Size Level, 511) of the jumbo frame 501, and the generated jumbo preamble frame 503 is transmitted. Transfer to layer module 107 and transmit through optical transmission module 109.

On the other hand, the partial wavelength selective insertion / extraction filter module 301 is switched to the 100% wavelength extraction mode. ONIC A 201, which is currently using a network, needs to extract the signal wavelength inserted into the network. That is, by extracting all the signal wavelengths that have been inserted into the network and circulated through the optical network in the form of a token ring, the signal is prevented from remaining in the network and occupying the network. Therefore, the ONIC that generates and transmits the jumbo frame, the partial wavelength selective insertion / extraction filter module 301 switches to the 100% wavelength extraction mode to extract all the signal wavelengths circulated through the network.

The jumbo packet frame generation module 313 generates the jumbo packet frame 505 immediately after the jumbo preamble frame 503 is transmitted, and the generated jumbo packet frame 505 is transmitted to the transmitting electronic physical layer module 107. Transmitted via the optical transmission module 109.

The ONIC B 203 transmits some wavelength intensities that the ONIC B 203 should receive to the optical receiving module 101 through the wavelength selective filter 411 and passes the remaining wavelength intensities to the next node. Sent to ONIC C 205.

Jumbo frames 501 received through the optical receiving module 101 and the receiving electronic physical layer module 103 are divided into jumbo preamble frames 503 and jumbo packet frames 505 within the jumbo frame processing module 303. Error check is performed and stored in each receive buffer.

First, in the received jumbo preamble frame 503, token information 507 and 509 and jumbo frame length information 511 are extracted from the jumbo frame processing module 303 and transferred to the jumbo frame control module 309. The jumbo frame control module 309 operates the timer of the jumbo frame 501 passing time according to the jumbo frame length information 511. If the received token information 507 is the same as its token identifier, jumbo frame control is performed. The timing of the transmission is controlled according to the timer control of the module 309.

The jumbo frame control module 309 transmits the jumbo packet frame 505 length information to be transmitted to the jumbo packet frame generation module 313 to the jumbo frame control module 309 when it is time to transmit by the timer. The jumbo frame control module 309 transmits the length information corresponding to the length of the jumbo packet frame 505 to be transmitted and the ONIC C 205 token information of the next transmission to the jumbo preamble frame generation module 311.

The jumbo preamble frame generation module 311 generates the jumbo preamble frame 503, and the generated jumbo preamble frame 503 is transferred to the transmission electronic physical layer module 107 and transmitted through the optical transmission module 109. Is sent.

In addition, the partial wavelength selective insertion / extraction filter module 301 is switched to the 100% wavelength extraction mode, in which the jumbo packet frame 505 generating module 313 immediately generates the jumbo packet frame 505 and generates the jumbo. The packet frame 505 is delivered to the transmitting electronic physical layer module 107 and transmitted through the optical transmission module 109.

Thus, wavelength sharing ONICs have the opportunity to share data and transmit data without colliding with each other.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the wavelength-sharing ONIC according to the present invention has an opportunity to share the same wavelength without collision, and thus, up to n X m optical subscriber channels using n wavelengths in a DWDM network composed of m ONICs can be obtained. As a result, by sharing the wavelength on the optical line having a limited number of wavelengths, the subscriber channel can be enlarged m times, and the bandwidth utilization rate can be increased.

Claims (8)

An optical network interface card apparatus in which a plurality of wavelength division multiplex networks of a token ring structure are connected to share an optical signal of the same wavelength, A wavelength token manager configured to manage token information for distinguishing the plurality of optical network interface card devices to determine an order of using the optical signals of the same wavelength; Jumbo packet frame generation unit for converting the data to be transmitted to jumbo packet frame consisting of at least one packet; A jumbo frame control unit which receives length information of the generated jumbo packet frame from the jumbo packet frame generation unit and receives token information of an optical network interface card device to use the optical signal of the same wavelength next from the wavelength token management unit; A jumbo preamble frame generation unit for receiving a packet length information from the jumbo frame controller and token information of an optical network interface card device that will use the optical signal of the same wavelength next to generate a jumbo preamble frame; And An optical transmitter for receiving the jumbo preamble frame and the jumbo packet frame from the jumbo preamble frame generator and the jumbo packet frame generator, converting the jumbo preamble frame and the jumbo packet frame to optical signals of a predetermined wavelength, and transmitting them to the network Including but not limited to: The jumbo preamble frame Token information of the optical network interface card device currently using the optical signal of the same wavelength, and next to the token information of the optical network interface card device to use the optical signal of the same wavelength and the length information of the jumbo frame, The jumbo packet frame Including information on the optical network interface card device to which the jumbo packet frame is to be transmitted and data to be transmitted. And an optical network interface card device. The method of claim 1, The optical network interface card device A partial wavelength selective extraction filter for extracting only an optical signal having a predetermined wavelength from the optical signal received from the network; An optical receiver configured to receive an optical signal having a predetermined wavelength extracted from the partial wavelength selective extraction filter and convert the optical signal into an electrical signal; And Jumbo frame processing unit for separating the jumbo frame converted into an electrical signal from the optical receiver into a jumbo preamble frame and jumbo packet frame to transmit the token information and jumbo frame length information stored in the jumbo preamble frame to the jumbo frame controller Include more, The jumbo frame control unit Controlling a time point for transmitting a jumbo preamble frame and a jumbo packet frame based on the token information; Generating jumbo frame length information based on the jumbo frame length information and the jumbo packet frame length information generated from the jumbo packet frame generation unit; And an optical network interface card device. The method of claim 2, The partial wavelength selective extraction filter An acoustic wave generator for generating acoustic waves; An acoustic wave transmitter for guiding the generated acoustic waves; And A wavelength selective filter for changing the intensity of an optical signal having a predetermined wavelength among the optical signals by the guided acoustic wave Optical network interface card device comprising a. The method of claim 1, One of the plurality of optical network interface card devices connected to the network is a server device and the other is a client device, The wavelength token manager of the server device Receiving and registering token information from a wavelength token manager of the client device and generating optical signal usage order information of the same wavelength; The wavelength token manager of the client device Transmitting token information to a wavelength token manager of the server device, and receiving and storing the optical signal usage order information; And an optical network interface card device. A wavelength sharing method in a network by an optical network interface card apparatus in which a plurality of wavelength division multiplex networks having a token ring structure are connected to share an optical signal having the same wavelength, Determining a use order of the optical signals of the same wavelength based on token information for distinguishing the plurality of optical network interface card devices; A second step of converting data to be transmitted into a jumbo packet frame composed of at least one packet; A third step of generating a jumbo preamble frame based on the length information of the generated jumbo packet frame and token information of an optical network interface card device that will next use the optical signal of the same wavelength; Converting the jumbo preamble frame into an optical signal having a predetermined wavelength and transmitting the same to the network; And A fifth step of converting the jumbo packet frame into an optical signal having a predetermined wavelength and transmitting the same to the network; Including but not limited to: The jumbo preamble frame Token information of the optical network interface card device currently using the optical signal of the same wavelength, and next to the token information of the optical network interface card device to use the optical signal of the same wavelength and the length information of the jumbo frame, The jumbo packet frame Including information on the optical network interface card device to which the jumbo packet frame is to be transmitted and data to be transmitted. Wavelength sharing method characterized in that. The method of claim 5, The wavelength sharing method Extracting only an optical signal having a predetermined wavelength from the optical signal received from the network; A seventh step of receiving an optical signal having a predetermined wavelength extracted from the partial wavelength selective extraction filter unit and converting the optical signal into an electrical signal; An eighth step of separating the jumbo frame converted into the electrical signal into a jumbo preamble frame and a jumbo packet frame; A ninth step of controlling a time point at which the jumbo preamble frame and the jumbo packet frame are transmitted based on the token information stored in the jumbo preamble frame; And A tenth step of generating jumbo frame length information based on the received jumbo frame length information and the generated jumbo packet frame length information; Wavelength sharing method further comprising. The method of claim 6, The sixth step An eleventh step of generating an acoustic wave; And A twelfth step of changing an intensity of an optical signal having a predetermined wavelength among the optical signals by the generated acoustic wave Wavelength sharing method comprising a. The method of claim 5, One of the plurality of optical network interface card devices connected to the network is a server device and the other is a client device, The first step in the server device is A thirteenth step of receiving and registering token information from the client device; And Fourteenth step of generating the optical signal usage order information of the same wavelength Including, The first step in the client device is A fifteenth step of transmitting token information to the server device; And A sixteenth step of receiving and storing the optical signal usage order information from the server device; Wavelength sharing method comprising a.