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------+| | | / \ | | | |- -| | | +-----+ | +------------------------------------------------------------------+