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an_1211-1


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Standard and CRC-4
frame testing



                     Application Note 1211-1




                                               1
    In-service testing of 2 Mb/s digital    particular signal structure to pass   It is likely that the PTT/service
    circuits and services is greatly        through the network. Although this    provider will not be able to
    enhanced when framing is added to       transparency can be useful for        guarantee network performance
    the 2 Mb/s data.                        transmission of wideband signals,     with unstructured 2 Mb/s traffic. In
                                            sending an unstructured signal into   view of this, most private networks
    CCITT recommendation G.703              the network can have drawbacks.       operate with the standard 2 Mb/s
    which defines characteristics of                                              frame structure defined in CCITT
    hierarchical digital interfaces,        An apparently random signal           recommendations G.704 and G.706.
    states that for the 2 Mb/s hierarchy,   cannot be monitored in-service by
    transmission can be bit-sequence        the service provider for
    independent. In other words 2 Mb/s      transmission errors, and it is
    and 64 kb/s facilities are "clear       impossible to provide bandwidth
    channel", and do not require any        grooming or switching of channels.

                                                                                  Standard 2 Mb/s framing
    Frame Format 



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