JP4046227B2 - Optical communication system supervisory control network - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a monitoring control signal transmission technique in an optical communication system, and more particularly to an optical communication system monitoring control network using Ethernet as a monitoring control signal transmission means .
[0002]
[Prior art]
Supervisory control network configuration of a conventional optical communication system, to place a router for monitoring control network at a ratio of approximately 1: 1 to the optical communication apparatus for transmitting a main signal (user signal), the inter-router connected by a dedicated line or the like It was common to do this (for example, see Non-Patent Document 1).
[0003]
FIG. 4 shows a conventional configuration example. In FIG. 4, 401 to 405 are optical communication apparatuses (OTN apparatuses), and 411 to 415 are routers for a supervisory control network. The optical communication devices 401 to 405 are connected by an optical fiber cable and transmit a main signal (user signal). On the other hand, the routers 411 to 414 are connected by a dedicated line or the like, and transmit and receive supervisory control signals for the optical communication apparatuses 411 to 415 by time division multiplexing or the like.
[0004]
[Non-Patent Document 1]
Watanabe et al., “Photonic transport network testbed of NTT”, ECOC'2000, September, 2000
[0005]
[Problem to be Solved by the Invention]
The supervisory control network architecture of a conventional optical communication system, for managing the optical communication device by placing the router for monitoring control network at a ratio of approximately 1: 1 to the optical communication apparatus, it requires a large number of routers, yet They needed to be set correctly.
[0006]
The present invention has been made in view of such problems in the configuration of the supervisory control network of the conventional optical communication system. For the construction of the supervisory control network, the installation of the supervisory control network router of the optical communication apparatus is minimized. It aims at realizing the efficiency improvement of the maintenance operation of an optical communication system by reducing operation.
[0007]
[Hand throws to solve problems]
The present invention employs Ethernet as a means for transmitting a supervisory control signal of an optical communication apparatus in an optical communication system in which a plurality of optical communication apparatuses are coupled to each other via an optical fiber cable .
That is, according to the present invention, the supervisory control signal of the optical communication apparatus that transmits the main signal is transparently transmitted by Ethernet, and the router for the supervisory control network is minimized, and the Ethernet switch, Ethernet-OSC is used instead of the router. Use conversion means. Thereby, the Ethernet segment (network unit) can be expanded, and a plurality of optical communication apparatuses can be managed by one Ethernet segment.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the overall configuration of a network according to an embodiment of the present invention. In FIG. 1, 101 to 105 are optical communication devices (OTN devices), 111 is a router for a supervisory control network, 112 to 115 are Ethernet switches (SW) for a supervisory control network, 121 to 125 are fiber cables for transmission lines, 131 to 140 is an Ethernet-OSC converter (CV), and 141 to 145 are interface lines. The thick line represents the main signal path, and the middle thick line represents the supervisory control channel.
[0009]
The optical communication apparatuses 101 to 105 transmit main signals (user signals) to each other via the optical fiber cables 121 to 125. The optical communication devices 101 to 105 and the router 111 or the Ethernet switches 112 to 115 transmit and receive monitoring control signals for Ethernet signals (Ethernet frames) via the interfaces 141 to 145, respectively.
[0010]
The monitoring control network router 111 or the Ethernet switches 112 to 115 are combined with the Ethernet-OSC conversion units 131 to 140, and the monitoring control signal of the Ethernet signal from the router 111 or the Ethernet switches 112 to 115 is transferred to the Ethernet by the Ethernet-OSC conversion unit. The signal is converted into an optical supervisory control signal (OSC), input to the optical communication devices 101 to 105 of the node, and transmitted to the adjacent optical communication device using the optical fiber cables 121 to 125. In the receiving side node, the optical supervisory control signal is inversely converted into the supervisory control signal of the Ethernet signal by the Ethernet-OSC converter, and is input to the router 111 or the Ethernet switches 112 to 115. As for the optical supervisory control signal (OSC), ITU-T Recommendation G. 872 and conforms to this.
[0011]
FIG. 1 shows a monitoring network of one Ethernet segment. In this example, the number of monitoring control network routers is limited to one, and Ethernet switches 112 to 115 and Ethernet-OSC conversion units 131 to 140 are used instead. By transmitting the Ethernet signal transparently, the five optical communication apparatuses 101 to 105 are managed by one Ethernet segment. Of course, the number of optical communication devices to be managed need not be five.
[0012]
FIG. 2 shows a configuration example of an optical communication node device according to an embodiment of the present invention. In FIG. 2, reference numeral 200 denotes an optical communication apparatus, 210 denotes a supervisory control network router or an Ethernet switch, and 220-1 to 220-n denote Ethernet-OSC conversion units. The optical communication device 200 includes a main signal unit 201 that processes a main signal, and a monitoring control unit 202 that performs monitoring control of the entire optical communication device including the main signal unit 201. The monitoring control unit 202 transmits / receives a monitoring control signal of an Ethernet signal to / from the monitoring control router or the switch 210 via the interface line 215. The monitoring control network router or the Ethernet switch 210 is one of the monitoring control unit 202 and the Ethernet-OSC conversions 220-1 to 220-n or the Ethernet-OSC conversion units 220-1 to 220-n of the optical communication apparatus 200. The monitor control signal of the Ethernet signal is transmitted / received by selecting the pair 1, the pair m, the m pair m (m ≧ 2), or the like. The Ethernet-OSC converters 220-1 to 220-n perform conversion of the Ethernet signal from the supervisory control signal to the optical supervisory control signal (OSC) or vice versa. The main signal unit 201 of the optical communication device 200 has different functions depending on the type of the optical communication device. Here, the main signal unit 201 includes at least wavelength demultiplexing units 2010-1 to 2010-n, and includes at least one main signal and at least one main signal. The optical monitoring control signal (OSC) is combined and demultiplexed.
[0013]
Hereinafter, the signal flow of the supervisory control channel will be described. The supervisory control signal of the Ethernet signal output from the router for the supervisory control network or the Ethernet switch 210 is input to one or a plurality of the Ethernet-OSC converters 220-1 to 220-n, where the optical supervisory control signal Aligned with (OSC) format, bitlet. ITU-I Recommendation G. In 872, the OSC signal format is not particularly defined. For example, when the SDH (Synchronous Digital Hierarcky) / SONET (Synchronous Optical Network) frame format is used, the Ethernet signal is used as the payload portion. To place. The outputs (optical supervisory control signals) of the Ethernet-OSC conversion units 220-1 to 220-n correspond to those of the wavelength demultiplexing units 2010-1 to 2010-n in the main signal unit 201 of the optical communication apparatus 200. Wavelength multiplexed with the main signal and transmitted to the adjacent node using the optical fiber cable 230. On the other hand, the optical signal transmitted from the optical fiber cable 230 is demultiplexed by the wavelength demultiplexing units 2010-1 to 2010-n, and the optical monitoring control signal (OSC) is converted to the Ethernet-OSC conversion units 220-1 to 220-n. Is input. In the Ethernet-OSC converters 220-1 to 220 -n, the OSC format bit rate is restored to the monitoring control signal of the Ethernet signal and is input to the monitoring control network router or the Ethernet switch 210.
[0014]
FIG. 3 shows a configuration example of the Ethernet-OSC conversion unit. The Ethernet-OSC conversion unit 300 includes an Ethernet-IF unit 310, an Ethernet SERDES unit 320, a mapping unit 330, an OSC SERDES unit 340, and an OSC-IF unit 350. The physical interface unit 310 with Ethernet is an interface of the physical layer of Ethernet. Since there are various physical layer standards in Ethernet, the Ethernet-IF unit 310 extracts an Ethernet frame from a desired physical layer standard and performs reverse conversion thereof. The Ethernet SERDES unit 320 is a conversion unit that matches the Ethernet signal with the interface condition of the mapping unit 330. Here, the mapping unit 330 is converted into a parallel signal, and the Ethernet-IF unit 310 is converted into a serial signal. The mapping unit 330 converts the input Ethernet frame into an OSC frame, and converts the OSC frame, which is the inverse conversion thereof, into an Ethernet frame. The OSC SERDES unit 340 is a processing unit that matches the OSC signal with the interface condition of the mapping unit 330. In particular, when the SDH / SONET standard is used, the LSI or the like can be used as it is. The OSC-IF unit 350 is a transceiver that transmits and receives optical signals. The OSC-IF unit 350 converts the received optical signal into a serial electrical signal and transmits the electrical signal as an optical signal.
[0015]
As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention is not limited to the structure of FIG. 1 thru | or FIG.
[0016]
【The invention's effect】
As described above, according to the present invention, since a plurality of optical communication devices can be managed by one Ethernet segment, network management can be made efficient.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an optical communication system monitoring and control network according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of an optical communication node device according to an embodiment of the present invention.
FIG. 3 is a configuration example of an Ethernet-OSC conversion unit used in an optical communication node device.
FIG. 4 is a configuration example of a conventional optical communication system supervisory control network.
[Explanation of symbols]
101 to 105 Optical communication device 111 Monitoring control network routers 112 to 115 Monitoring control network Ethernet switches 121 to 125 Optical fiber cables 131 to 140 Ethernet-OSC conversion unit 200 Optical communication device 201 Main signal unit 2010-1 to 2010-n Wavelength demultiplexing unit 202 Monitor control unit 210 Monitor control network router or Ethernet switch 220-1 to 220-n Ethernet-OSC conversion unit

Claims (2)

In an optical communication system in which a plurality of optical communication devices are coupled to each other via an optical fiber cable, a monitoring control network for transmitting a monitoring control signal of the optical communication device,
A supervisory control network router is provided in the optical communication device of at least one node, and the supervisory control network E is provided in the optical communication devices of other nodes. thernet A switch is provided, and the optical communication device of the node and the router or E thernet The switch is E through the interface thernet Send and receive signal monitoring control signals,
The router and the E thernet Each of the switches has the E thernet A conversion unit for converting the monitoring control signal of the signal into the optical monitoring control signal and vice versa,
The router or E of the node thernet E from switch thernet A signal supervisory control signal is converted into an optical supervisory control signal by the conversion unit, and the optical supervisory control signal is transmitted to an adjacent node via an optical fiber cable, so that the plurality of optical communication devices are connected to one E thernet An optical communication system supervisory control network managed by a segment. Each optical communication device multiplexes the main signal and the optical monitoring control signal from the conversion unit and transmits it to the optical fiber cable, separates the optical signal received from the optical fiber cable, and converts the optical monitoring control signal to the conversion 2. The optical communication system supervisory control network according to claim 1, further comprising an optical demultiplexing unit for transmission to said unit.

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