ASON ((Automatic Switched Optical Network)

Because ASON ((Automatic Switched Optical Network) is structure in all kinds of transmission technology, namely above in transmission plane SDH, optical transmission network (otns) increased independent control plane above, so it supports current transmission network can provide various rate and different signal characteristics (such as format, bitrate, etc) business. In ASON network can provide customer nets yuan between two fixed bandwidth is the transmission channel, define the input in optical network access point and output access point between.

Business types

ASON business in the following aspects:

SDH business, support g. 707 definition of SDH connection particles VC - n and VC - n - Xv;

Otns business, support g. 709 defined otns connection ODUk and ODUk - particles n-substituted Xv; Transparent or opaque wavelength operations;

10 MB/s, 100Mb/s, 1Gb/s and 10Gb/s Ethernet operations;

Based on optical fiber connection (FICON), enterprise system connection (ESCON) and fibre channel (FC) of storage area network (SAN) business.

For new business types ASON with expansibility. ASON can support multiple types of business model, each business model has its own business attributes, target market and business management requirements.

Business connection topological type

In order to support enhanced business (such as bandwidth on-demand, diversity circuit ZhiPei and bind connection, etc), ASON should support calls and connection control of separation. Call and connection control of separation can reduce the intermediate connection control node overmuch call control information, remove the decoding and explain the burden of news. ASON support connection topological types include: point-to-point connections, one-way two-way point-to-point connections, one-way point to a multipoint connection.

Due to call and call can connect separate, a corresponding multiple connections, currently two-way point-to-point connection is the most main connection.

Business connection type

ASON network support three business network connection type: permanent connection (PC), exchange connection (SC), soft permanent connection (SPC).

PC and SPC connections are launched by the management of the plane connecting management. The difference between the PC and SPC in connection is light inside network using net command or real-time signal, the two methods are initiated by operators build business connections.

SC connection through UNI signaling interface, user's business request initiated by controlling the plane (including signaling agent) send the UNI, namely the operators to establish business connection user directly launched.

Business level

The current level cannot according to formulate the corresponding service level price policy, causing the waste of resources disposition, and can be easily ASON network of business circuit priority division, thus providing a service agreement (SLA) transmission business circuit. The reliability of customers for different connections have different demands that can use "business level" to describe. In ASON network, business level mainly through mapped to different recovery, protect options and related links to realize the priority, for example establishing priority, keep priority (free), whether can advance recovery priority.

Establish priority mainly refers to the response time and build a business in Japan, respectively within hours or minutes to establish business connections.

Keep priority (whether can spare) is mainly refers to advance in the system when other system fault appears would be idle out of business, more important bearing business connection itself have protection.

Restore priority is to consider system malfunction recovery time and restore level (such as restoring business percentage).

Will a single business level mapped to a series of protection and recovery options, each operators have different choice. Control level based on each connection link support, and the priority set support will bandwidth resources reserve as posterior purpose and failure to repair recovery by normalization. General support business connection level include: special connection (1 + 1 and 1:1), sharing protection (1: N and M: N), don't protect (in the main electricity transmission), don't protect road in protecting circuit business (transmit), etc.

Business access method

In order to make business access ASON network, user first need to send plane and the establishment of physical connection operator network. According to the position of operator network and customers, business access can take inning access (optical network nets yuan and client nets yuan in a ground), direct remote access (with special links to client), via access subnet distal access and double to access.

ASON must support double to access. For the same customer equipment with double to access when should not require multiple addresses, double to access is a special case of access. Adopt double to access the main purpose is to enhance network survivability, when a access failed, the customer's business can rely on another access without interruption. Customer equipment can double to approach (two different path) access to the core nets/operator.

From a security perspective, the network resources should avoid of unauthorized access, business access control is to limit and control entity attempt to access to network resources, especially through the mechanism of network node interface external and UNI (E - NNI). Connection admission control (CAC) function should support the following safety features.

1. CAC applies to all through the UNI (or E - NNI) access to network resources entities. CAC including authentication function, to prevent entity who pretend to be another entity fraud by pretending to use network resources. Has the certification entity will according to configurable strategy management is given a business access level.

2. UNI and network nodes on the interface (NNI) should provide the mechanism to guarantee the customer certification and link information integrity, such as the link establishment, dismantling and signaling information, to be used to connect to the administrative and prevent business invasion. UNI and E - should also include NNI based on the application of CAC billing info, prevent connection management information forged.

3. Each entity may be authorized by the operators management strategy use of network resources.