Word Test - The description of the test

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

In this test the digital transmitter and receiver can work independently.
In transmitter mode, the test-set inserts digital patterns into the PCM timeslot specified by the PCMT:TIMESLOT variable.

>>>
        In case of PCM_INTERFACE it is possible to insert:

         * to the voice channels (1...15,17...31)  The 31th channel is the 16th timeslot!

         * to the Frame Alignment Word
         * to the Frame Service Word
         of the 0th timeslot

            * to the Multiframe Word
            * to the Signalling ABCD bits
         of the 16th timeslot (if the CAS multiframe is defined)

        The series of patterns should contain 1..60 different code words.
        By programming patterns to all zero, all ones or free
        combination, 50% or other duty cycle of bit series can be
        obtained. The specified pattern series can be injected
        into the primer flow "BURST" times. The consecutive pattern
        elements can be inserted one by one or a pattern element
        can be repeated "TX:INSERTION_CYCLE" times before proceeding
        the next.

        Error injection is also supported. This feature can be setup by the
        ERROR_INJECTION variable. The injection has homogenous
        distribution over the timeslot domain.

        In receiver mode, the EQS-133 records the code words of the timeslot
        given by RX:INSERTION_MODE variable.
        In case of PCM_INTERFACE it is possible to record:

         * data from the voice channels (1...15,17...31). The 31th channel is the 16th timeslot!

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

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

         * the timeslot called "alarm" (a virtual timeslot
           containing alarm information)

        The digital receiver works in TRANSIENT RECORDER MODE in this case.
        The byte changes are recorded only to reducing the required memory
        size.
        The receiver counts the received frames in the FRAME_NUMBER variable
        at the same time. The receiver records both the code and the number
        of the frame at change of the state.

<<<

    The valid range for the key variables are as follows:

         CONFIGURATION    D->,->D,DD->,->DD,D-D,DD-DD;
         VARIABLE_PARAM   FRAME_NUM; (TIME)
         TX:TEST_SIGNAL   PATTERN;
         REPORT           RESULT-LIST, 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------+|
     |                              | / \ |                             |
     |                              |-   -|                             |
     |                              +-----+                             |
     +------------------------------------------------------------------+