KR20120070897A - Method and apparatus for protection switching of optical signal in multicasting ring network - Google Patents

Method and apparatus for protection switching of optical signal in multicasting ring network Download PDF

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Publication number
KR20120070897A
KR20120070897A KR1020100132420A KR20100132420A KR20120070897A KR 20120070897 A KR20120070897 A KR 20120070897A KR 1020100132420 A KR1020100132420 A KR 1020100132420A KR 20100132420 A KR20100132420 A KR 20100132420A KR 20120070897 A KR20120070897 A KR 20120070897A
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KR
South Korea
Prior art keywords
node device
optical signal
protection switching
optical
node
Prior art date
Application number
KR1020100132420A
Other languages
Korean (ko)
Inventor
이현재
Original Assignee
한국전자통신연구원
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Priority to KR1020100132420A priority Critical patent/KR20120070897A/en
Publication of KR20120070897A publication Critical patent/KR20120070897A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/275—Ring-type networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0283—WDM ring architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to protection switching of optical signals, and more particularly, to a method and apparatus for protection switching of optical signals in a multicast ring network.
In a multicast ring network system in which a plurality of node devices according to the present invention are connected in a ring form, a method of performing protection switching in a node device that receives an optical signal among a plurality of node devices, the first node device adjacent to the node device Receiving an optical signal from the first node device and performing protection switching according to a destination of the optical signal received from the first node device to transmit the optical signal to the lower node device or to another node device adjacent to the node device. Transmitting.
According to this aspect of the present invention, it is possible to more efficiently configure the protection switching of the multicasted optical signal on the optical network.

Description

Method and apparatus for protection switching of optical signal in multicasting ring network

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to protection switching of optical signals, and more particularly, to a method and apparatus for protection switching of optical signals in a multicast ring network.

When there is a problem in traffic transportation due to a link failure or device failure between nodes constituting the network, it provides continuous stable service through protection switching. The protection switching function applied in the conventional ring-type Add crop multiplex (ADM) network structure is the same as the 1 + 1 OCHP of the point-to-point network structure, and has the following protection switching characteristics.

The conventional ring-type ADM network structure performs protection switching through unidirectional protection switching, and when protection switching is applied, unidirectional protection switching switching is performed at the receiving end. In addition, the conventional ring-type ADM network structure is non-recursive, does not apply the APS protocol, and transmits traffic signals in various route methods. The conventional ring-type ADM network structure is divided into two rings (operation ring and spare ring), and uses a protection switching method that receives a signal transmitted from the spare ring in the opposite direction when a failure occurs in one operation ring. . The conventional ring-type ADM network structure has a problem of very low efficiency by allocating only one wavelength band to one optical fiber. In addition, the conventional ring-type ADM network structure has a capital investment cost because the ring-type ADM matches the number of optical channels receiving the traffic signal at that node by the number of transmitters required to retransmit the traffic signal at that node. expenditures (CAPEX) and operating expenses (OPEX).

The present invention is to solve such a problem, it is an object of the network configuration to reduce the capital investment cost (CAPEX) and operating costs (OPEX) by transmitting only the channel necessary for transmitting a new signal through the present invention through the present invention.

The foregoing technical problem is achieved by the characteristic aspects of the present invention described below. In a multicast ring network system in which a plurality of node devices according to the present invention are connected in a ring form, a method of performing protection switching in a node device that receives an optical signal among a plurality of node devices, the first node device adjacent to the node device Receiving an optical signal from the first node device and performing protection switching according to the destination of the optical signal received from the first node device to transmit the optical signal to the lower node device or to another node device adjacent to the node device. Transmitting.

According to this aspect of the present invention, it is possible to more efficiently configure the protection switching of the multicasted optical signal on the optical network.

As described above, the present invention can more efficiently configure the protection switching of the multicasted optical signal on the optical network, thereby reducing the capex and the operating cost OPEX. In addition, by extracting and using the desired wavelength through the present invention there is an effect that can be economical network configuration and protection switching in the multicast transmission.

1 is an exemplary view illustrating a traffic signal operating method in a general ring-type ADM network;
2 is a block diagram of a node device capable of protection switching on a multicasting ring network according to an embodiment of the present invention;
3 is an exemplary diagram of performing protection switching on a multicasting ring network according to an embodiment of the present invention;
4 is a flowchart of a method for performing protection switching in a multicast ring network system in which a plurality of node devices are connected in a ring form according to an embodiment of the present invention;
5 is a flowchart illustrating a method of protection switching of an optical signal received by a second node device according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail so that those skilled in the art can easily understand and reproduce the present invention through these embodiments.

1 is an exemplary diagram illustrating a traffic signal operating method in a general ring-type ADM network.

As shown in FIG. 1, in a general ring type add drop multiplex (ADM), the node device A 100 and the node device C 120 constituting the annular network transmit traffic signals. The transmitting side bridges clockwise to transmit the traffic signal, and the receiving side composes the automatic recovery network by comparing the quality state with respect to the traffic signal received from both sides and selecting a good state signal.

That is, in the general ring type ADM, the node device A 100 selects one of the lines 140 and 142 and transmits a traffic signal in a normal state. If an abnormality occurs on the line between the node device A 100 and the node device B 110 in this state, the node device C 130 receives the traffic signal transmitted from the node device A 100 via the line 142. Receive. In addition, the node device A 100 receives the traffic signal transmitted from the node device C 130 through the line 143, so that the node device A 100 and the node device C 130 can normally transmit and receive the traffic signal. . However, this ring-type ADM matches the number of fiber channels that receive traffic signals at that node by the number of transmitters required to retransmit the traffic signal at that node, resulting in a capital investment cost (CAPEX) and operating cost (OPEX). It will happen a lot.

2 is a block diagram of a node device capable of protection switching on a multicasting ring network according to an embodiment of the present invention.

As shown, the transmitting end of the node device 200 includes an optical transmitter 211, an optical multiplexer 212, an optical coupler 213, and an optical amplifier 214. In addition, an optical receiver 221, an optical amplifier 222, a band cut filter 223, an extraction / pass module 224, a demultiplexer 225, and a switch 226 are provided at the receiving end of the node device 200. ). The optical transmitter 211 and the optical receiver 221 transmit and receive an optical signal with a node device adjacent to the node device 200 itself or a node device located on another network. The optical multiplexer 212 combines the plurality of optical wavelength signals and transmits the optical signals to the node device adjacent to the node device 200 through the optical coupler 213 and the optical amplifier 214. Here, the optical signal is preferably a working signal and a protection signal.

Such an optical signal may be coupled by the optical coupler 213 with a signal passed through the optical multiplexer 212 and a signal passed through the extraction / pass module unit 224. When the optical coupler 213 is coupled as described above, the optical amplifier 214 amplifies the optical signal. The optical amplifying unit 214 compensates for the optical signal reduced during extraction or passage of the optical signal channels and channel combination, and compensates for the reduced optical signal due to long-distance transmission. On the other hand, the optical signal amplified by the optical amplifier 214 is transmitted to the node device adjacent to the node device 200 or another node device located on another network through the optical fiber.

Meanwhile, the optical signal multiplexed at the neighboring node and received through the optical receiver 221 is amplified by the optical amplifier 214 and passes through the extraction / pass module unit 224. This optical signal is coupled to the optical coupler 213 and transmitted to another neighboring node.

On the other hand, the optical signal extracted from the extraction / passing module unit 224 is separated by the signal through the demultiplexer 225, each of the separated signal through the switch 226 through the optical transmitter 211 node And to a node device located on another network adjacent to the device 200. In other words, if the destination of the received optical signal is itself, the extraction / passing module unit 224 extracts the optical signal and transmits the optical signal to the node device of the lower network or another network node device. On the other hand, if the destination of the received optical signal is not itself, the extraction / pass module unit 224 passes the received optical signal to be transmitted to the node device adjacent to the node device 200.

As such, the extraction / pass module unit 224 may separate the extracted optical signal by the channel separation method as follows. When the optical signal is extracted, the extraction / pass module unit 224 separates the optical signal into a whole signal, separates by band, or separates by channel. That is, the node device further includes a demultiplexer 225 and a switch 226, and the extraction / passing module unit 224 may include the demultiplexer 225 and the switch 226 included in the node device 200. Depending on the location, the optical signal may be protected and switched by the entire signal, the band, or the channel, and transmitted to the node device on the lower network or the node device on another network.

Meanwhile, according to an additional aspect of the present disclosure, the node device 200 may further include a band cut filter unit 223, and the band cut filter unit 223 may include an optical signal transmitted from the node device 200. By blocking the reception from the neighboring node device or another neighboring node device), interference with the optical signal channel can be prevented from occurring by the optical signal transmitted from the node device 200. The band cut filter unit 223 can also cut any channel, band or all channels as necessary.

The operation of each configuration of the above-described node device will be described in more detail with reference to FIG. 3.

3 is an exemplary diagram for performing protection switching on a multicasting ring network according to an embodiment of the present invention.

As shown, according to an embodiment, the node device A 300 combines the optical signal multiplexed from the multiplexer 301 through the optical coupler 302. Thereafter, the node device A 300 amplifies the corresponding optical signal through the optical amplifier 303 and transmits the optical signal to the node device D 330 or the node device of the lower network. When the node device A 300 receives an optical signal from the node device B 310, the node device A 300 extracts or passes the optical signal received through the extraction / passing module unit 304. Decide When it is determined whether to extract or pass the received optical signal, the node device A 300 checks whether the corresponding optical signal is a signal transmitted from the node device A 300 through the band cut filter unit 305. As a result of the check, if the signal is transmitted from the node device A 300, the node device A 300 blocks the optical signal, and if it is not a signal transmitted from the node device A 300, extraction or reception of the received optical signal is performed. The following operation is performed according to the pass / fail decision. When it is determined that the optical signal passes from the extraction / passing module unit 304, the node device A 300 amplifies the optical signal and transmits the optical signal to the node device C 330. On the other hand, when the extraction of the corresponding optical signal is determined from the extraction / pass module unit 304, the node device A (300) separates the optical signal into a whole signal, by band or by channel. Thereafter, the node device A 300 protects and transfers the corresponding optical signal separated by the whole signal, the band, or the channel through the demultiplexer 306 and the switch 307 and the node device on the lower network or another. Transmit to node devices on the network.

Up to now, each configuration of a node device capable of protection switching on a multicasting ring network has been described in detail. Hereinafter, a method of performing protection switching in a multicast ring network system in which a plurality of node devices are connected in a ring form will be described in detail.

4 is a flowchart illustrating a method of performing protection switching in a multicast ring network system in which a plurality of node devices are connected in a ring form according to an embodiment of the present invention.

As shown, one node device (hereinafter referred to as a first node device) of a plurality of node devices connected in a ring form in a multicast ring network system multiplexes a plurality of optical wavelength signals into an optical signal, and multiplexed operation. An optical signal obtained by combining the optical signal of the signal and the preliminary signal through an optical coupler is output (400). Subsequently, a neighboring node device (hereinafter referred to as a second node device) adjacent to the node device that outputs the optical signal receives the optical signal output from the first node device, and transmits the corresponding optical signal according to the destination of the received optical signal. The extracted data is transmitted to the node device located in the lower network or another network through the protection switching, or passed to the node device adjacent to the second node device (hereinafter referred to as the third node device) (410). As described above, the second node device which extracts the optical signal output from the first node device or transmits the optical signal to the third node device can be achieved by the following method.

5 is a flowchart illustrating a method of protection switching of an optical signal received by a second node device according to an embodiment of the present invention.

As shown, the second node device receives an optical signal from a node device on a first node device or subnetwork adjacent to it or a node device on another network (500). When the optical signal is received from the node device on the first node device or the lower network or the node device on another network, the second node device checks whether the received optical signal is an optical signal transmitted by itself and transmits the received optical signal. If it is an optical signal, it blocks the reception of the optical signal transmitted by itself through the band cut filter (510, 520). Accordingly, the second node device can prevent the interference with the channel of the optical signal sent by the second node device.

On the other hand, if the result of the check is not an optical signal transmitted from the second node apparatus, the second node apparatus performs a determination process whether to extract or pass the optical signal through the extraction / passing module unit. However, the present invention is not limited thereto, and the second node apparatus transmits the optical signal from the second node apparatus through the band cut filter after determining whether to extract or pass the optical signal through the extraction / pass module unit. It can be determined whether or not.

In order to extract or pass through the received optical signal, the second node apparatus analyzes the destination of the optical signal through the extraction / pass module unit, and if the received optical signal is not the destination of the second node apparatus, the second node apparatus itself The received optical signal is transmitted to the third node device adjacent to the terminal (530). On the other hand, when the analysis result of the extraction / passing module unit indicates that the received optical signal is the destination of the second node apparatus, the second node apparatus extracts the received optical signal. When the optical signal is extracted, the second node device separates the optical signal extracted through the extraction / pass module unit, and performs the protection switching through the demultiplexer and the switch (540, 550). Accordingly, the second node device may transmit the protection switched optical signal to the node device on the lower network or the node device on another network (570).

So far I looked at the center of the preferred embodiment for the present invention.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Node device: 100, 120, 130, 140, 200, 300, 310, 320, 300
140, 141, 142, 143: line 211: optical transmitter
212: optical multiplexer 213: optical coupler
214,222: optical amplifier 221: optical receiver
223: band cut filter unit 224: extraction / passing module unit
225: demultiplexer 226: switch

Claims (1)

In a multicast ring network system in which a plurality of node devices are connected in a ring form, a method of performing protection switching in a node device that receives an optical signal among the plurality of node devices,
Receiving an optical signal from a first node device adjacent to the node device;
Performing protection switching according to a destination of the optical signal received from the first node device to transmit the optical signal to a lower node device or to another node device adjacent to the node device;
A method for performing protection switching in a multicast ring network system comprising a.
KR1020100132420A 2010-12-22 2010-12-22 Method and apparatus for protection switching of optical signal in multicasting ring network KR20120070897A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100132420A KR20120070897A (en) 2010-12-22 2010-12-22 Method and apparatus for protection switching of optical signal in multicasting ring network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100132420A KR20120070897A (en) 2010-12-22 2010-12-22 Method and apparatus for protection switching of optical signal in multicasting ring network

Publications (1)

Publication Number Publication Date
KR20120070897A true KR20120070897A (en) 2012-07-02

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