Abstract

The 5ESS® switch uses a process called retrofit to migrate from one software release to the next. This process allows a smooth changeover with minimal service interruption. Traditionally, the office-dependent database (ODD) being “evolved” during this process is sent to an off-site location for processing, checked for correctness, and converted to the format required by the new software release. The updated ODD is then returned to the site, to be loaded during the retrofit. During this time (called a “freeze” period), changes on the ODD have to be limited. For some customers of Lucent Technologies, this limitation has become a problem. Customers are also reluctant to let proprietary data leave their own organization. To address these problems, the 5ESS-2000 Product Realization Center has developed a plan to change the off-site ODD evolution method to an on-switch procedure. This will shorten the “freeze” period dramatically and eliminate the need to send data outside the office. To carry out this change, the ODD can now be checked for correctness using Population Rule Language, version 5 (PRL5), a new structured language that describes the office data population. In 1999, when all components of the development plan are integrated into the 5ESS switch architecture, it will be possible to perform a 5ESS switch retrofit completely at the switch site.

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