KEYWORDS: Optical networks, Interfaces, Standards development, Green fluorescent protein, Prototyping, Switches, Signal processing, Local area networks, Network architectures, Internet
Work on optical network control plane protocols has enabled faster and more efficient provisioning and management of carrier core optical networks, thereby reducing operational costs and capital expenditure. Many potential data applications for such capabilities, however, require Ethernet as the physical interface into the network, rather than SONET/SDH or OTN (Optical Transport Network) interfaces. Support of such services over an optical network becomes a multi-layer networking problem, wherein the client layer is packet based (e.g., Ethernet) and the server layer is optical (SONET/SDH or OTN). This paper discusses the enhancements that have been created in SONET/SDH and OTN networks (e.g., GFP, VCAT, LCAS) for the efficient transport of Ethernet and other data networking protocols, and the related extensions to control plane protocols that are necessary to allow for the support of multi-layer networking. Different control-plane models are being pursued in standards bodies such as ITU-T and IETF, and prototyping is being carried out and tested in the OIF. These various approaches are discussed in detail here, with focus placed on the prototyping work that has been done in the OIF, especially for the OIF 2005 Interoperability Demonstration.
This paper provides an overview of recent efforts on the ASON standards for optical network control, including current status of ITU-T specifications and future work. A primary focus of the paper is also recent ASON-related testing in the industry, especially the OIF World Interop Demonstration held at SUPERCOMM 2004, where ASON signaling and routing architecture and protocols were tested across multiple vendors and carrier testing laboratories. Results were highly successful, indicating work on ASON, while not yet complete, is stable and implementable.
This paper describes the current state of network signaling for ATM broadband SVC call control, and the direction of evolution of the current work in the ITU, ANSI and the ATM Forum activities. The most recent issues of the signaling protocols will support enhancements to the basic call control such as point-to-multipoint network connections, variable bit rate, look-ahead, and negotiation/modification of connections. Future activities are aimed at the areas of extensions to basic connection control, adaptation of narrowband procedures such as echo control and mobility, and linking of ATM signaling with higher level application control efforts such as DSM CC and TINA. These extensions to the signaling protocol will allow signaling to support basic connection services with a variety of different connection types. More complex multimedia services are likely to be provided using service-specific control protocols, where basic signaling provides a component part for the control of network connections.
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