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ISO 9001:2000 certified. ICMA5KUTASTM64-SPEC05-0806-A4. ©2008 Anritsu. All Rights Reserved.
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Testing APS switch time reaction of the network with 125 µs resolution
Due to the large amount of information being transferred over Synchronous Optical Network (SONET/SDH), it is extremely
important to ensure that the transport services are as readily available as possible.
APS -Automatic Protection Switching- is the protection mechanism that has been implemented in SDH/SONET networks in
order to guarantee the availability of the network in case of problems. The protection process involves switch actions between
working fibers and backup fibers. This process is completed when the equipments at both ends of the network have completed
these actions within the same 50 ms completion time. The result of this operation is the disappearance of the defaults because
the traffic is then transmitted on the backup channel.
The UTA-SDH/SONET application is able to detect defaults that may appear during a protection switch and displays their
duration with 125 µs resolution. With the ‘’Event Analysis” function of UTA, you have access to all the information from a
single window: total switch duration, details of all the events, partial duration for each event…
Fig.1: With the “Event Analysis” window, see all the defaults during the protection switch with 125 µs resolution.