论文部分内容阅读
HJ905/906型交换机是目前国内使用最多的一种纵横制交换机。纵横制交换机依靠继电器来完成交换任务,因此不接收电话机拨发的音频号码。目前,电话机大多是脉冲、音频功能兼容,其音频功能无法在纵横制交换机上应用,使电话使用者感到极不方便。本文介绍的DTMF—905音频板,加装到纵横制交换机上之后,能使交换机收发音频号码。 DTMF—905音频板足加装在纵横制交换机的用户记发机上的,每个记发机上加一块DTMF—905音频板。DTMF—905的功能是接收电话机上拨的音频号码,将号码译成数字信号,并将译码后的信号在编码电路中编成适用交
HJ905 / 906 switch is the most widely used crossbar switch. Crossbar switches rely on relays to perform switching tasks and therefore do not receive phone numbers dialed. At present, most of the telephones are impulses and the audio functions are compatible. Their audio functions can not be applied on the crossbar switch, making the phone users feel extremely inconvenient. This article describes the DTMF-905 audio board, added to the crossbar switch, enabling the switch to send and receive audio numbers. DTMF-905 audio board installed in the crossbar switch user record machine, each recording machine to add a DTMF-905 audio board. The function of DTMF-905 is to receive the audio number dialed on the telephone, translate the number into a digital signal, and compile the decoded signal in the coding circuit