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    • 36. 发明授权
    • Data access arrangement for detecting the hook status of an extension device
    • 用于检测扩展装置的挂钩状态的数据访问装置
    • US06456703B1
    • 2002-09-24
    • US09346248
    • 1999-07-01
    • Jeffrey Lee
    • Jeffrey Lee
    • H04M1100
    • H04M11/06
    • A full-featured data access arrangement (DAA) for connecting a modem to a public switched telephone network (PSTN) includes a bridge current loop circuit, a line in use detection circuit, an off hook relay, a loop current sense circuit, and an extension/remote event detector circuit. The off hook relay is connected in series with the current loop circuit to enable the DAA to detect external off hook and on hook events when the modem is in an on hook state. The DAA is configured to detect the off hook and subsequent on hook status of an extension telephone at a location even though the modem and a handset sharing a line connector with the modem are both in an on hook state. The DAA is also capable of detecting an off hook state of an extension telephone even though the modem is in an off hook state. In addition, the DAA can detect when a remote telephone device that initiates an incoming call is placed on hook.
    • 用于将调制解调器连接到公共交换电话网络(PSTN)的全功能数据访问装置(DAA)包括桥接电流回路电路,在线检测电路,脱钩继电器,环路电流检测电路和 扩展/远程事件检测电路。 脱扣继电器与电流回路电路串联连接,使DAA能够在调制解调器处于挂机状态时检测外部断线和挂机事件。 即使调制解调器和共享与调制解调器的线路连接器的手机都处于挂机状态,DAA被配置为检测在一个位置处的分机的摘机状态和随后的挂机状态。 即使调制解调器处于摘机状态,DAA还能够检测分机电话的摘机状态。 此外,DAA可以检测何时启动来电的远程电话设备被挂起。