Test Solutions in Present IP Bearer Network

Time Synchronization Test Solutions in Present IP Bearer Network

IP bearer network has the capability of carrying a variety of services. Currently, 2G, 3G networks are in coexistence, and 3G is moving to 4G. So still 2G, 3G, 4G will be in coexistence for a long considerable period. However, all services will be carried through IP bearer network. Synchronization performance of the IP bearer network can directly affect the normal and stable operation of all services. In the current IP bearer network, the time synchronization test involves new test requirements like time server test, IEEE1588 asymmetry compensation test, long-term stability tests of devices in IP bearer network, etc. Therefore, XGXC China releases a new time synchronization test instrument, and improves the efficiency of opening, verification, and maintenance tests of present IP bearer network.



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    1 Test Solutions


     Test Solutions in Present IP Bearer Network

    Fig 1    Test Solutions in Present IP Bearer Network

    Test items:

    Absolute Time Accuracy of Output Interface

    Relative Time Accuracy of Output Interface

    Time Stability of Output Interface

    Time Punctual Accuracy

    Switching Performance


    2 IEEE1588 Asymmetric Compensation Measurement

     IEEE1588 Asymmetric Compensation Measurement


    Fig 2     IEEE1588 Asymmetric Compensation Measurement

    Perform continuous test for 15 minutes in the 1PPS+TOD interface of backbone layer or convergence layer devices, or in the 1PPS+TOD, FE, GE interfaces of Access layer devices.


    2.1  Time Synchronization Performance Measurement in IP Bearer Network

    After measurement, users need to verify and evaluate the systematic synchronization performance of the IP bearer network.

    Test Items:

    Time output accuracy of each network elements(short term and long term)

    The impact of time output from IP bearer network devices when switching between main and standby time sources

    The impact of time output from IP bearer network devices when switching between different time paths

    Service heavily-loaded(background traffic)measurement


    2.2  Time Synchronization Performance Measurement in Base Station

    The time server transfers the high-precision time information over IP bearer network to the base station system. Therefore, the quality of the time will have great impact on the normal running of base station system.

    Test Items:

    Time output accuracy of base station(short term)

    Time output stability of base station(long term)

    The impact of time output from base station devices when switching between different time paths

    The impact of time output from base station devices when switching between main and standby time sources




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