SONET
| Hi-index | 0.00 |
As the usage of Internet is getting more widespread, users expect its availability to approach that of telephone networks. From the perspective of the users, they should be able to communicate in spite of hardware and software failures, network maintenance and upgrades. Even the quality of service should be maintained for better than 99.9% of time for high priority traffic. To provide such high availability, Internet Service Providers not only install network equipment that is highly reliable, but also provide alternate paths of communication between switches by reserving resources on the network that are only fully utilized in case of failure to redirect traffic away from the point of failure. This paper provides overview of the protection and restoration schemes present in the routers in the core of the network and guidelines of how to use these schemes.