EVENT_COUNTER - The description of the test

In this test-item the test-set can be used as a pattern generator and/or an event counter. This feature also supports the user effectually to discover the mistakes of devices used for transfer of digitally coded signals.

>>>
        In this measurement the digital transmitter and receiver
        work independently.  The transmitter and the receiver
        functions can be programmed by setting the TX:MEASURING_SIGNAL
        and RX:MEASURING_SIGNAL variables.

        The mode of transmission is the same as in the WORD_TEST measurement.

        In receiver mode the measuring set counts the code word changes of
        a timeslot given by the RX:INSERTION_MODE variable.
        In case of PCM_INTERFACE it is possible to count:

         * data changes from the voice channels (1...15,17...31)

         * events from the 0th timeslot
            * Frame Alignment Word
            * Frame Service Word

         * events from the 16th timeslot
            * Multiframe Word
            * Signalling ABCD bits

         * events from the timeslot called "alarm" (a virtual time-slot
           containing alarm information

        The measuring time intervals can be set in the ACQUISITION_TIME
        variable; there is no pause between measurements.

        The total measuring time can be programmed by the ACQUISITION_TIME
        and the NUMBER_OF_MEAS_SEQ variables,
        that is:

                ACQUISITION_TIME x NUMBER_OF_MEAS_SEQ x 60 [sec]
<<<

    The valid range for the key variables are as follows:

         TEST_CONFIG      D->,->D,DD->,->DD,D-D,DD-DD;
         VARIABLE_PARAM   TIME;
         TX:TEST_SIGNAL   OFF PATTERN;
         REPORT           RESULT-LIST, HISTOGRAM, ALARM-LIST;

    Typical test scheme can be seen in the following figure:

    KEDITABRA:8-2-26.BMP
     +------------------------------------------------------------ D-D -+
     |                                                                  |
     |+------Â----------+           +-SUT-+          +----------Â------+|
     ||TX_A  |   PCMT_A>Ã-->--------´D   DÃ-------->-´>PCMR_A   | RX_A ||
     ||      |          |           | \ / |          |          |      ||
     |+------Á----------+           |  X  |          +----------Á------+|
     |                              | / \ |                             |
     |                              |-   -|                             |
     |                              +-----+                             |
     +------------------------------------------------------------------+