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Method, system and node equipment for establishing optical cross connection
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An optical cross-connect and node technology, applied in the field of network communication, can solve the problems of complex implementation and low reliability
Active Publication Date: 2014-02-26
HUAWEI TECH CO LTD
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[0005] Embodiments of the present invention provide a method, system, and node device for establishing an optical cross-connect, which solves the problems of complex implementation and low reliability in the prior art
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Embodiment 1
[0269] Embodiment 1. This embodiment of the present invention provides a method for establishing an optical cross-connect. Such as image 3 In the shown WDM network, the connection lines between nodes A, B, C, and D represent optical fiber links. Interface 1 is an up / down optical interface of node A, and interface 6 is an up / down optical interface of node C.
[0270] In the upper and lower optical interfaces, "up" refers to the sending end, usually one or more lasers; "down" refers to the receiving end, usually one or more receivers.
[0271] The network management or client notifies node A to establish image 3 The connection between interface 1 of node A and interface 6 of node C requires two subcarriers with a spectrum bandwidth of 50 GHz, and the spectrum resources between adjacent subcarriers do not overlap. The route calculated by node A or obtained through the network management is (A, B, C), that is, (interface 1, interface 2, interface 3, interface 4, interface 5, ...
Embodiment 2
[0307] Embodiment 2, the embodiment of the present invention provides a method for establishing an optical cross-connect. Such as image 3 In the shown WDM network, the connection lines between nodes A, B, C, and D represent optical fiber links. Interface 1 is an up / down optical interface of node A, and interface 6 is an up / down optical interface of node C.
[0308] The network management or client notifies node A to establish image 3 The connection between interface 1 of node A and interface 6 of node C requires two subcarriers with a spectral bandwidth of 50 GHz, and half of the spectral bandwidths of adjacent subcarriers overlap.
[0309] The route calculated by node A or obtained through the network management is (A, B, C), that is, (interface 1, interface 2, interface 3, interface 4, interface 5, interface 6), then node A is the source node, and node B is An intermediate node, node C is the sink node. The method specifically includes the following steps:
[0310] St...
Embodiment 3
[0409] Embodiment 3, the embodiment of the present invention provides a node device, such as Figure 7 shown, including:
[0410] The first determining unit 701 is configured to determine the number of connected subcarriers, the spectrum bandwidth of a single subcarrier, and the non-overlapping of spectrum resources between adjacent subcarriers.
[0411] The first processing unit 702 is configured to obtain a first set of available central frequencies of the first link according to the spectrum bandwidth of a single subcarrier; the first link is the current node device and the adjacent node device in the direction from the current node device to the second node device link between.
[0412] Determine the frequency range covered by each idle center frequency of the first link according to the spectrum bandwidth of a single subcarrier, if the frequency range covered by an idle center frequency is all idle spectrum resources, determine that the idle center frequency is an availa...
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Abstract
The present invention relates to the network communication field, and discloses a method for establishing an optical cross-connection. The method includes: determining, by a first node, the number of subcarriers, spectrum bandwidth of a single subcarrier, and non-overlap of spectrum resources between neighboring subcarriers of a connection; obtaining, by the first node, a first set of available center frequencies of a first link according to the spectrum bandwidth of a single subcarrier; sending, by the first node, a request message to a neighboring node in a direction from the first node to a second node, where the request message carries at least the number of subcarriers, information on the spectrum bandwidth of a single subcarrier, subcarrier overlap attribute information, and information on the first set of available center frequencies; receiving, by the first node, a response message, and obtaining a set of center frequencies of the subcarriers of the connection; and establishing an optical cross-connection based on a spectrum range determined according to non-overlap of spectrum resources between neighboring subcarriers, the set of center frequencies of the subcarriers, and the spectrum bandwidth of a single subcarrier. Further, embodiments of the present invention disclose a system and a node device for establishing an optical cross-connection.
Description
technical field [0001] The invention relates to network communication technology, in particular to a method, system and node equipment for establishing an optical cross connection. Background technique [0002] The connections in the WDM network are carried by optical fiber links, and each connection needs to occupy a certain amount of optical fiber spectrum resources. Usually, available spectrum resources in an optical fiber are divided into fixed spectrum intervals, and each spectrum interval is used as a channel to carry a connection, and the bandwidths of connections carried in the same optical fiber are the same. As a result, when services with different bandwidth requirements are transmitted using mixed connections, it is necessary to divide the spectrum resources of the optical fiber into channels according to the services with the largest bandwidth requirements, while other services with smaller bandwidth requirements do not require such a large bandwidth channel, wh...
Claims
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Application Information
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