Associated services with different sources in ASON systems


Associated services with different sources can survive a single-point hardware failure but are difficult to maintain. Therefore, you are not advised to configure such services.

Other related questions:
Types of ASON services
Question: What are the types of ASON services? Answer: Diamond service: important services that need to be kept for a long time and allow only transient interruptions, such as private lines for banks, securities, and important government sectors. Gold service: services that have strict requirements on real-time processing, latency, and transient service interruption time, such as 2M and 3G voice services, and VIP customer services. Silver service: services with unstable, burst, and heavy traffic, and that do not require real-time processing, such as data private line services, cell Internet access services, and cable TV services. Copper service: temporary services. The impact is small even if such a service is interrupted. Summary and Suggestion: An important feature of ASON is the survival against multiple faults. The survivability requirements are as follows: A diamond service can be rerouted to a new trail for at least once after its working or protection trail becomes faulty. A gold service can undergo at least one protection switching and can be rerouted and restored for at least once. A silver service can be rerouted and restored for at least once. For the first or last node of a service, when a link that carries the maximum service bandwidth becomes faulty for the first time, the impaired service can be restored to another fiber of the node. It is recommended that the services be converged into VC-4 services outside ASON NEs if possible. If tunnel services are required, gold tunnels are preferentially selected. Silver tunnel is the second choice. In this case, you need to create two silver tunnels with separate routes, and configure lower-order SNCP services for dual-feeding and selective receiving of the two silver tunnels.

Differences between dual-homing diamond services and associated services
Dual-homing diamond services have similar application scenarios to associated silver services originated from the same source. They differ in the number of managed services. Specifically, two services are managed for associated silver services, but only one ASON service needs to be managed for a dual-homing diamond service. Associated silver services originated from the same source can be converted into dual-homing diamond services.

ASON service SLA
ASON service SLAs are classified into diamond, silver, and copper. The service protection policies vary according to service SLAs. Diamond services have the highest priority in the system. That is, the system ensures the normal transmission of diamond services with preference. Silver services have a priority higher than copper services but lower than diamond services.

Service association in ASON
Service association is intended for some important services for which protection is required. Different from diamond services, service association allows service add and drop at different sites. Associated silver services with the same source support sharing of associated trails. When one of the associated services is interrupted, the rerouted trail will separate from the associated trail to ensure that the two trails do not completely overlap only when the trail sharing is disabled.

Components of an ASON system
According to ITU-T recommendations, an ASON system is made up of three parts: control plane, management plane, and transmission plane. The management plane refers to the U2000 system, the control plane includes a WDM network, and the control plane carries the ASON software.

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