JP4888966B2 - Node equipment - Google Patents

Description

  The present invention relates to a node device, and more particularly to a node device that includes a WXC device configured with WSS and connects a plurality of ring-configured optical networks.

  WXC (Wavelength Crossconnect) devices are being widely used as devices for arbitrarily bundling wavelengths and routing them. This makes it possible to output a WDM (wavelength division multiplexing) optical signal as it is to an arbitrary port by using a node device including a WXC device configured with a WSS (Wavelength Selective Switch). In other words, it is possible to transfer the wavelength-division multiplexed signal while being wavelength-multiplexed using an optical element called WSS that can output the wavelength-division multiplexed optical signal to any port as it is. Such a node device including a WXC device configured by WSS is particularly effective as a node device that connects a plurality of ring-configured optical networks.

  FIG. 3 is a block diagram showing a multi-ring network system configured by connecting two ring configuration optical networks.

  The first ring configuration optical network 1 includes node devices 4 to 6, and the second ring configuration optical network 2 includes node devices 7 and 8. The node devices 4 to 8 are configured by ROADMs, and the ROADMs add / drop optical signals by OEO conversion. The first and second ring-configured optical networks 1 and 2 are connected by a node device 3 including a WXC device.

  By configuring the node device 3 to include a WXC device configured with WSS, the transmitted WDM (wavelength division multiplexing) optical signal is output as it is to an arbitrary port as it is all-optical. As a result, it is possible to exchange traffic between the first and second ring-structured optical networks 1 and 2 while maintaining the WDM optical signal for the through wavelength. That is, the WDM optical signal can be passed to the other ring configuration optical network while being wavelength-multiplexed.

  FIG. 4 is a block diagram showing a node device including a WXC device configured with WSS. The node device includes WSSs 11 to 14 for Add and WSSs 15 to 18 for Drop. When this node device is used as the node device 3 for connecting the first and second ring configuration optical networks 1 and 2 in FIG. 3, the Add WSSs 11 and 12 and the Drop WSSs 15 and 16 are the first ring configuration optical networks. The WSSs 13 and 14 for Add and the WSSs 17 and 18 for Drop are constituent elements of the second ring constituent optical network 2 (NW2).

  Here, when a WDM optical signal is passed from the first ring configuration optical network 1 side to the second ring configuration optical network 2 side, the WDM optical signal on the first ring configuration optical network 1 side is dropped by the drop WSS 15 or 16. Add with WSS13 or 14 for Add. Conversely, when a WDM optical signal is passed from the second ring configuration optical network 2 side to the first ring configuration optical network 1 side, the WDM optical signal on the second ring configuration optical network 2 side is sent by the drop WSS 17 or 18. Drop and add with Add WSS11 or 12. When transferring a WDM signal in the same ring configuration optical network, the WDM signal is dropped and added by the drop WSS and the add WSS belonging to the same ring configuration optical network. For example, when a WDM signal is transferred in the first ring configuration optical network 1, the WDM signal is dropped by the drop WSS 15 or 16 and added by the add WSS 12 or 11.

The configuration of such a two-ring configuration optical network connection node is described in Non-Patent Document 1.
Optical Fiber Communication Conference (OFC) / the National Fiber Optic Engineers Conference (NFOEC): International conference name OFC / NFOEC2006, presentation number NThC3

  In order to construct a highly reliable optical network, it is conceivable that the node devices including the WXC device have a redundant configuration and the nodes are distributed so that the service can be continued even when the node is down or the station is down. In particular, since nodes that connect between ring-configured optical networks handle a large amount of traffic, high reliability is required, and accordingly, a redundant configuration is required.

  FIG. 5 is a block diagram showing a multi-ring network system when the node device has a redundant configuration. In FIG. 5, the same or equivalent parts as in FIG. Here, the first and second ring configuration optical networks 1 and 2 are connected by a node device having a redundant configuration by combining the node devices 3 and 3 ′.

  Thus, a highly reliable optical network can be constructed | assembled by making a node apparatus into a redundant structure. However, this is merely a combination of two conventional node devices as they are to form a redundant configuration, so that the number of parts increases, the reliability decreases and the cost increases as the number of parts increases. Occurs.

  An object of the present invention is to provide a node device having a redundant configuration including a WXC device configured with WSS, which solves the above-described problems and can suppress an increase in cost with a small number of parts.

In order to solve the above-described problems, the present invention has a redundant configuration in which a first node device and a second node device configured separately are combined in a node device that connects a plurality of ring configuration optical networks. The first node device and the second node device each include a WXC device configured with WSS, and each ring configuration optical network has only one pair of WSS for Add and WSS for Drop , and the first node device Each of the drop WSSs directly forms one of the paths from the first node device to the add WSS that does not pair with the self-drop WSS and to all the add WSSs of the second node device, Each drop WSS of the second node device is connected to the add WSS of the second node device that does not pair with its own drop WSS and all the add WSSs of the first node device. It is characterized by forming one of these routes directly .

In addition, the present invention includes a WXC device configured with WSS in a node device that is combined to make a node device that connects a plurality of ring-configured optical networks redundant, and is added to each ring-configured optical network. The drop WSS for each ring-configured optical network includes a pair of WSS for Drop and a WSS for Drop. It is characterized by directly forming any one of the paths .

  According to the present invention, in a node device that connects a plurality of ring-structured optical networks, a single node device that is used in combination when making it a redundant configuration, and a redundant configuration node device that is configured by combining them. The number of WSSs can be reduced. In addition, the reliability can be increased by reducing the number of parts (WSS), and the cost can be further reduced.

  In addition, since the redundantly configured node device is configured by combining the first node device and the second node device configured separately, when either the first or second node device fails and goes down In this case, only one node device needs to be replaced, which is advantageous in terms of cost.

  Before describing the present invention, first, a description will be given of a node device and its operation when a conventional node device is simply combined to form a redundant configuration. FIG. 6 is a block diagram showing a node device when two node devices of FIG. 4 are prepared and are simply combined to form a redundant configuration. One node device 3 includes Add WSSs 11 to 14 and Drop WSSs 15 to 18. The other node device 3 'has the same configuration as the node device 3, and includes Add WSSs 11' to 14 'and Drop WSSs 15' to 18 '. The node devices 3 and 3 'are connected as shown in the figure to form a redundant configuration.

  Drop WSS15, 16 'and Add WSS11, 12' are connected to the first ring configuration optical network 1 (NW1) side, Drop WSS17, 18 'and Add WSS13, 14' are connected to the second ring configuration optical network 1. By connecting to the (NW2) side, it is possible to transfer WDM signals between the first and second ring configuration optical networks 1 and 2 and to transfer WDM signals within the same ring configuration optical network.

  For example, when the WDM optical signal on the first ring configuration optical network 1 side is passed to the second ring configuration optical network 2 side, the WDM optical signal on the first ring configuration optical network 1 side is sent to the drop WSS 15 or Drop of the node device 3. It is dropped by the WSS 16 ′ for add and added by the WSS 13 for Add of the node device 3 or the WSS 14 ′ for Add of the node device 3 ′.

  A state in which the WDM optical signal on the first ring optical network 1 side is dropped by the drop WSS 15 of the node device 3 and added by the WSS 13 for Add of the node device 3 (or the WSS 14 'for Add of the node device 3 ′). When the node device 3 goes down, the WDM optical signal on the first ring configuration optical network 1 side is dropped by the drop WSS 16 'of the node device 3' and added by the Add WSS 14 'of the node device 3'. By switching, the WDM optical signal on the first ring configuration optical network 1 side can be continuously passed to the second ring configuration optical network 2 side.

  In such an operation, between the WSS12 for Add and the WSS15 ′ for Drop, between the WSS14 for Add and the WSS17 ′ for Drop, between the WSS11 ′ for Add and the WSS16 for Drop, and between the WSS13 ′ for Add and the WSS18 for Drop, WDM optical signals Is simply through.

  The present invention pays attention to this point, and reduces the number of WSSs used in a single node device that is combined to form a redundant configuration, and further reduces the number of WSSs used in a node device that is combined to form a redundant configuration. Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a node device according to the present invention. 1 that are the same as or equivalent to those in FIG. 6 are denoted by the same reference numerals.

  As shown in FIG. 1, the node device according to the present embodiment has a redundant configuration by combining two separate node devices 3 and 3 '. Only one pair of Add WSS11 and Drop WSS15 is provided for the network 1 (NW1), and only one pair of Add WSS13 and Drop WSS17 is provided for the second ring configuration optical network 2 (NW2). The other node device 3 'includes only one pair of WSS 12' for Add and WSS 16 'for Drop for the first ring configuration optical network 1, and WSS 14' for Add for the second ring configuration optical network 2. Only one pair of WSS18 'for Drop is provided.

  As a result, the number of WSSs used in the node devices 3 and 3 'alone, and the number of WSSs used in redundant node devices configured by combining them are compared with the conventional node devices (FIGS. 4 and 6). 1/2. Thus, even if the number of WSSs is reduced, the function as a redundant node device is the same as that of the node device of FIG.

  For example, the WDM optical signal on the first ring configuration optical network 1 side is dropped at the drop WSS 15 of the node device 3 or the drop WSS 16 ′ of the node device 3 ′, and the add WSS 13 of the node device 3 or the node device 3 ′. The WDM optical signal on the first ring configuration optical network 1 side can be passed to the second ring configuration optical network 2 side by adding with the Add WSS 14 ′.

  The management control of the node equipment is executed by the host management control equipment, which of the drop WSS15 and 16 'drops the WDM signal, and which of the add WSS13 and 14' adds the WDM signal, etc. Also, it is determined by route selection by the management control device in consideration of the transmission cost from the transmission source node to the transmission destination node.

  A state in which the WDM optical signal on the first ring optical network 1 side is dropped by the drop WSS 15 of the node device 3 and added by the WSS 13 for Add of the node device 3 (or the WSS 14 'for Add of the node device 3 ′). When the node device 3 goes down, the WDM optical signal on the first ring configuration optical network 1 side is dropped by the drop WSS 16 'of the node device 3' and added by the Add WSS 14 'of the node device 3'. Switch. Thereby, the WDM optical signal on the first ring configuration optical network 1 side can be continuously passed to the second ring configuration optical network 2 side.

  Here, since the node devices 3 and 3 ′ are configured separately, if any of the node devices 3 and 3 ′ is down, it is only necessary to replace the down node device, which is advantageous in terms of cost. It is.

  The node device according to the present invention is not limited to connecting two ring configuration optical networks, and can be configured to connect three or more ring configuration optical networks. FIG. 2 is a block diagram showing another embodiment of the node device according to the present invention configured to connect the first to third ring-configured optical networks (NW1, NW2, NW3). In addition, the same code | symbol is attached | subjected to the same or equivalent part as FIG.

  The node device of this embodiment includes node devices 3 and 3 ′. One node device 3 includes only one pair of WSS11 for Add and WSS15 for Drop for the first ring configuration optical network 1 (NW1), and WSS13 for Add and Drop for the second ring configuration optical network 2 (NW2). Only one pair of WSSs 17 is provided, and only one pair of WSSs 21 for Add and WSS22 for Drops are provided for the third ring configuration optical network 2 (NW3). The other node device 3 'includes only a pair of Add WSS 12' and Drop WSS 16 'for the first ring configuration optical network 1 and Add WSS 14 for the second ring configuration optical network 2. ′ And Drop WSS18 ′ are provided, and only a pair of Add WSS23 ′ and Drop WSS24 ′ are provided for the third ring configuration optical network 2 (NW3). According to this embodiment, a WDM signal can be transferred between the first to third ring-structured optical networks NW1, NW2, and NW3 with a small number of WSSs.

It is a block diagram which shows one Embodiment of the node apparatus which concerns on this invention. It is a block diagram which shows other embodiment of the node apparatus which concerns on this invention. It is a block diagram which shows the multi-ring network system comprised by connecting two ring structure optical networks. It is a block diagram which shows the node apparatus containing the WXC apparatus comprised by WSS. It is a block diagram which shows a multi-ring network system at the time of making a node apparatus into a redundant structure. It is a block diagram which shows a node apparatus at the time of making a redundant structure by combining two node apparatuses simply.

Explanation of symbols

1, 2 ... Ring configuration optical network, 3, 3 ', 4-8 ... Node equipment, 11-14, 11'-14', 21, 23 '... WSS for ADD, 15-18, 15'-18 ', 22, 24' ... DROP WSS

Claims (2)

In a node device that connects a plurality of ring-configured optical networks,
A redundant configuration in which the first node device and the second node device configured separately are combined;
Each of the first node device and the second node device includes a WXC device configured with WSS, and includes only one pair of add WSS and drop WSS for each ring configuration optical network ,
Each drop WSS of the first node device is either routed to the add WSS of the first node device that does not pair with the own drop WSS and to all the add WSSs of the second node device. Each drop WSS of the second node device is connected to the add WSS of the second node device that does not pair with its own drop WSS and all add WSSs of the first node device. A node device that directly forms any one of the paths . In a node device that is combined to form a redundant configuration of node devices that connect a plurality of ring configuration optical networks,
Includes a WXC device configured with WSS, with only one pair of add WSS and drop WSS for each ring configuration optical network ,
The drop WSS for each of the ring-configured optical networks directly forms any path to the add WSS that does not pair with the self-drop WSS and all the add WSSs of the other node devices combined. Feature node equipment.

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