Nokia recommends that an OSS use the JMS event stream for ongoing monitoring of alarms and network objects, and the XML API only for on-demand information retrieval when synchronization is required. See Chapter 4, Event monitoring using JMS and Chapter 5, XML requests for more information about JMS and HTTP communication with the NFM-P.

Nokia strongly recommends that the time between an NFM-P main server and the OSS clients is synchronized using a timing synchronization protocol such as NTP for the following reasons:

• To facilitate the troubleshooting of OSS client and NFM-P interaction

• To prevent the JMS consumer on the OSS client from discarding keep-alive messages

Nokia recommends using the filter and resultFilter elements to reduce the number of objects and object properties that a request returns, and to speed data retrieval. See the following for information about filters and resultFilters:

• Inventory retrieval in HTTP communication

• JMS communication

• Chapter 4, Event monitoring using JMS , Chapter 5, XML requests , Chapter 11, Fault management , Chapter 13, Inventory management , and Chapter 14, Accounting, performance, and flow monitoring