论文部分内容阅读
在中高档三类传真机中,具有一些特殊的通信功能。主要有以下几种: 加密通信 它由普通三类机加装保密接口板(已设计在机内)来实现。发送时,先将编码信号送给加密专用设备进行加密,然后经接口送回传真机,再经MODEM调制,发送出去。接收时则是先将MODEM调解后的信号经接口送到加密专用设备解密,得到编码数据信号,而后送去记录。这里,是把传真机作为终端设备(DTE),把MODEM作为数据电路终接设备(DCE),加密专用设备位于两者之间。 为了使设备具有兼容性,加装保密接口板的传真机,均有转换开关。通过开关的设定,即可加密,实
In the high-end three types of fax machines, with some special communication capabilities. Mainly in the following categories: Encrypted communications It consists of three types of machines generally installed confidential interface board (has been designed in the machine) to achieve. Sent, the first encoded signal sent to the encryption dedicated equipment for encryption, and then sent back to the fax machine through the interface, and then MODEM modulation, sent out. Receiving is the first MODEM signal after mediation sent to the encryption device dedicated decryption, the encoded data signal, and then sent to record. Here, the fax machine is used as the terminal equipment (DTE), the MODEM as the data circuit termination equipment (DCE), and the encryption dedicated equipment is located between the two. In order to make the equipment compatible, the facsimile machine with security interface board is equipped with a change-over switch. Through the switch settings, you can encrypt, real