Alcatel-Lucent 1850 TSS-5 provides a synchronization status messaging feature to ensure the integrity of network synchronization during both normal and abnormal conditions. Through the use of synchronization status messaging, the current quality of the timing source can be conveyed from one Alcatel-Lucent 1850 TSS-5 to the next. This capability allows the Alcatel-Lucent 1850 TSS-5 to automatically change its timing reference in order to always maintain the highest quality timing available.
The applications that are currently supported with the synchronization messaging feature can be divided into two categories:
Alcatel-Lucent 1850 TSS-5, supports automatic synchronization reconfiguration.
SONET and SDH were designed to operate optimally in synchronous environments. Although plesiochronous and asynchronous operation can be supported through the use of pointer adjustments, transmission quality may be affected by the generation of additional jitter and wander due to pointer adjustments in some applications. Because of this, it is desirable to maintain synchronous operation whenever possible over SONET/SDH/Ethernet networks. Through the use of synchronization status messages over SONET/SDH/Ethernet, the quality of the different timing references can be made available at each Alcatel-Lucent 1850 TSS-5 NE. The Alcatel-Lucent 1850 TSS-5 system can be optioned to determine the best timing reference available and switch to that reference. Through this mechanism, the synchronous operation of the subnetwork can be maintained. The switching of timing references is hitless, and the synchronization status messages also allow it to be done without creating timing loops in the process.
A welcome side benefit of synchronization messaging is that it helps prevent provisioning errors. Provisioned timing loops on Alcatel-Lucent 1850 TSS-5 systems will be quickly detected through the synchronization messaging algorithm and prevented by forcing the system into holdover. The system can then be provisioned correctly.
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