Upgrade Without Service Interruption

During a software upgrade, the UMG8900 ensures thatonline services are not af fected and calls are not interrupted. Moreover , the period during which users cannot access new services is less than10 seconds. This feature minimizes the impact of a softwareupgrade on services and reduces the numberof access failures, thus enlarging the profits of carriers.

In the UMG8900, theboards are grouped into dif ferentbatches forbatch-by-batch software loading.

The boards working in master/slave mode are categorized into the master plane and slave plane. The slaveplane is upgraded first, and then the master plane is upgraded.

The boards working in load-sharing mode are grouped according to their functions. Only some boards in a group areupgraded each time to ensure that aboard that can provide services is available in each group.

In this manner , services arenot interrupted during the upgrade.