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    • 7. 发明授权
    • LAN phone system with automatic fallback for power or network failure
    • LAN电话系统具有电源或网络故障的自动备用
    • US06700970B1
    • 2004-03-02
    • US09617777
    • 2000-07-17
    • Michael AronsonThomas Joseph Schmidt
    • Michael AronsonThomas Joseph Schmidt
    • H04M700
    • H04L41/0677H04M3/42314H04M7/006
    • In a telephone system employing a PBX server to communicate with local telephones over a local area network, fallback adapters are provided to automatically respond to a power failure and also respond to the failure of the PBX server to automatically connect the telephones directly to a telephone line. This automatic connection enables the telephones to be used as analog phones and make and receive calls directly without using the PBX server. Power failure is detected by relays which default to a position to connect the telephones directly to the telephone line. The fallback detectors have controller logic which detects the presence of a ringing signal on the telephone line and the failure of the PBX to respond to the ringing signal. In addition, the fallback detectors detect the failure of the PBX to respond when a telephone is used to attempt to make an outgoing call or a call to another one of the local telephones. When the controller logic detects a failure of the PBX server to respond, the controller logic actuates the relays to their default positions.
    • 在使用PBX服务器通过局域网与本地电话进行通信的电话系统中,提供回退适配器以自动响应电力故障,并且还响应PBX服务器的故障以将电话自动连接到电话线路 。 这种自动连接使电话可以用作模拟电话,直接拨打和接听电话,无需使用PBX服务器。 继电器检测到电源故障,该继电器默认将电话直接连接到电话线。 回退检测器具有控制器逻辑,其检测电话线路上是否存在振铃信号,并且PBX的故障响应于振铃信号。 此外,回退检测器检测到当电话用于尝试拨打电话或拨打另一个本地电话时集团电话的故障。 当控制器逻辑检测到PBX服务器发生故障时,控制器逻辑将继电器驱动到其默认位置。