| 摘要 |
PURPOSE: A subscriber access subsystem having an automatic channel assignment function in a WLL(Wireless Local Loop) system and a method for automatically assigning channels are provided to prevent the interruption of communication service by making a subscriber access subsystem recognize the position of an SLIC(Subscriber Line Interface Circuit) board or an SIO(Serial Input Output) board so that time slots can automatically be allocated. CONSTITUTION: An antenna(11) transmits and/or receives radio signals. A transmit-receive processing part(12) converts a received analog signal into a digital signal or a digital signal to send into an analog signal. A modem(13) modulates or demodulates the data transmitted or received. A switching part(14) classifies the signals supplied from the modem(13) by time slots and outputs them to a serial connection part(15) and a port connection part(16). The serial connection part(15) consists of a data conversion part(151), a DPRAM(152) and a time slot interface part(153). The data conversion part(151) converts serial data into PCM data or PCM data into serial data. The DPRAM(152) is provided for message exchange between the serial connection part(15) and a processor(17) in order to confirm the allocation of time slots. The time slot interface part(153) outputs the PCM data, inputted from the data conversion part(151), to the switching part(14) by allocating a time slot. The port connection part(16) is comprised of a signal interface processing part(161) and a CODEC(162). The signal interface processing part(161) generates a ring signal, a detects a DTMF signal, and converts an input PCM signal into a voice signal or a facsimile signal. The CODEC(162) encodes or decodes input data. |
