Network operating system with topology autodiscovery
View Patent ↗The network operating system includes an embedded platform for controlling operation of an agile optical network at the physical layer level. At the module embedded level, each module (card-pack) is provided with an embedded controller EC that monitors and control operation of the optical modules. At the next level, each shelf is provided with a shelf processor SP that monitors and control operation of the ECs over a backplane network. All optical modules are connected over an optical trace channel to send/receive trace messages that can then be used to determine network connectivity. At the next, link management level, a network services controller NSC controls the SPs in a negotiated span of control, over a link network. The control is address-based; each NSC receives ranges of addresses for the entities in its control, and distributes these addresses to the SPs, which in turn distribute addresses to the ECs in their control. One of the SPs operates as a router on the link network to relay signaling and control to all entities based on their address. Each NSC constructs, from queried information, a network topology fragment for the embedded elements under its control. A distributed topology system (DTS) shares this topology information with neighboring NSC's to build a complete network view, which can be used by all interested network applications.
1. A platform for controlling operation of an agile optical network at the physical layer level, comprising:
a module level layer comprising a plurality of modules organized as domains for monitoring and controlling operation of all optical modules that make-up said agile optical network, said modules serially connected over an optical trace channel (OTC) that transports a trace message with information about identity and connectivity of said modules;
a shelf level layer for controlling operation of the plurality of modules within said module level layer and for collecting topology data regarding configuration of said module level layer, said shelf layer comprising a plurality of shelf processors (SPs), each SP operable to control at least one of the domains and to distribute addresses to each module in said respective domain; and
a shelf network for connecting said shelf processors within the shelf level layer with said module level layer.
2. The platform as claimed in claim 1 , wherein said trace message is a collection of identifiers updated by each module along an optical path with the respective module topology data.
3. The platform as claimed in claim 2 , wherein said collection of identifiers include a type, placement, and interconnect order of a module in said optical path.
4. The platform as claimed in claim 1 , wherein said shelf processor and said modules organized as a domain are housed in a shelf of equipment, and said shelf network is provided on a backplane of said shelf of equipment.
5. The platform as claimed in claim 1 , wherein said module level layer comprises a card equipped with:
means for receiving an optical module that performs a specific operation on a wavelength division multiplexed (WDM) signal; and
a module controller for identifying a type of optical module when inserted into said means for receiving, validating the configuration of said module against module templates and updating said trace message accordingly.
6. The platform as claimed in claim 5 , wherein said card further comprises:
means for optically-to-electrically (O-E) and electrically-to-optically (E-O) converting said trace message; and
means for distributing control and signaling data between said module controller and said shelf network and for distributing said converted trace message to and from said module controller.
7. The platform as claimed in claim 1 , wherein said module level layer comprises a terminal card equipped with:
an optical terminal provided with physical layer processing means, for converting a forward user signal into a forward traffic signal and converting a reverse traffic signal into a reverse user signal; and
a module controller for controlling operation of said optical terminal and said physical layer processing means, identifying a terminal type, validating the configuration of said module against module templates and updating a trace message accordingly.
8. The platform as claimed in claim 7 , wherein said module controller comprises a memory for storing a list of valid module templates.
9. The platform as claimed in claim 1 , wherein each of the shelf processors further comprises:
a shelf controller for identifying a shelf type, validating a shelf configuration against a shelf template and updating said trace message accordingly;
a network processor for distributing the addresses to each module in said respective domain and routing signaling and control data pertinent to the modules in each respective domain to/from said shelf controller; and
an interface between said network processor and a link-level network.
10. A network operating system (NOS) for an agile optical network, comprising:
a platform, organized as domains under control of one or more shelf processors (SPs), for controlling operation of said agile optical network at the physical layer level and for distributing addresses to modules in said domains;
a link management platform organized on spans of control (SOCs) under control of a network services controller (NSC), for controlling operation of said agile optical network at the optical connection layer level wherein said NSC exchanges signaling and control data with all other NSCs of said agile optical network over an internal data network (IDN) based on an unique address on said IDN; and
a link-layer network for connecting said SPs in a SOC with said NSC.
11. The NOS as claimed in claim 10 , wherein said link-layer network comprises a node network that connects said NSC with a SP at a node that houses said NSC.
12. The NOS as claimed in claim 11 , wherein said link-layer network comprises an optical line network that connects said NSC with a SP of an optical line amplifier connected in a fiber link that emanates from said node.
13. The NOS as claimed in claim 10 , wherein said link layer network is connected to said IDN over a SP in said link-level network that operates as a virtual router to distribute said signaling and control data to a tandem virtual router on another link-level network, based on said internal address.