Apparatus of Controlling Group Delay in the ATM Exchange

摘要

The present invention relates to a group delay calibration device in an ATM exchange, in particular to adjust the group delay which is generated in the generation process of the ATM cell to a group in the ATM exchange so as to suitable for the real-time service provided by the ATM switching delay calibration device.; The present invention provides a UTOPIA interface unit for supporting the CPU and interface CPU interface unit, a cell conversion unit, and a physical connection of the ATM, which converts the audio data of the PCM type conversion ATM cell or ATM cells into the voice data of PCM form, and the UTOPIA cell for transmitting and receiving cells with the other party side via the interface section transmitting and receiving unit, and temporarily storing the cells supplied from the corresponding cell transformation unit is the transmitted cell buffer unit transmitting portion that cell transmission and reception, the cell transceiver cell supplied from the a test cell to be in the received cell buffer group delay calibration device in an ATM exchange having parts which is part storage was the corresponding cell conversion date and time, generating a test cell stored in the transmit cell buffer unit and registers the test-cell generation time generating unit; The test cell, the test cell is transmitted and the other side of the loop in the test cell generating portion and the test cell receiving unit receiving through the buffer the received cells and notifies the reception of the test cell; Timer for receiving registration test cell generation time, from the test cell generating portion of the test received a test cell reception notification from the cell receiving unit measures the time of the group delay, and adjusting the cell conversion portion ATM cell ATM payload at the time of converting the length value, and control register cell and; The PCM audio data is characterized by comprising an echo receiving unit for measuring the total delay time comes converted into ATM cells are being transmitted and the echo return.