| 摘要 |
PURPOSE: A voice announcement apparatus in a full electronic telephone exchange is provided to implement 128 fixed or mixed voice announcement services at 256 channels and to enable a user to record or hear voice data with a handset or to download the data through a PC. CONSTITUTION: A voice announcement board is comprised of a control part(10), a TD-bus interface part(20), an SHW interface part(30), a memory part(40), a message processing part(50), a message recording processing part(60), a duplication processing part(70), an alarm processing part(80), and a power unit(90). The control part(10) scans a PPH(Peripheral Processor Hardware)-N's message processing command every 128(msec) interrupts and controls the message processing part(50). The TD-bus interface part(20) executes flag and data communication with the PPH-N through a dual port RAM according to a TD-bus selection signal. The SHW interface part(30) detects loopback data in executing a test command and reports the detected data to the control part(10). The memory part(40) is composed of 16 NVSRAMs to store fixed messages, one NVSRAM to store the time information of fixed messages, and 2 EEPROMs to store mixed messages. The message processing part(50) transmits the messages stored in the memory part(40) through the SHW interface part(30) according to the control of the control part(10). The message recording processing part(60) transfers a message and time information, supplied from a switch in the case of direct recording, to the control part(10) so that the control part(10) can write the time information of the message in the NVSRAM to store the time information of fixed messages. The alarm processing part(80) collects various alarms through the control part(10), the TD-bus interface part(20) and the SHW interface part(30) and reports them to the duplication processing part(70) and the PPH-N. The power unit(90) composed of an on-board DC/DC converter and an analog circuit, receives -48V and 0V and supplies +5V and GND.
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