公开(公告)号：US06278695B1

公开(公告)日：2001-08-21

申请号：US08871164

申请日：1997-06-09

申请人： Kenneth J. Christensen ,  Frances E. Noel ,  Rudolf E. Rehquate ,  Thomas Stammely ,  Jerry Dagher ,  Beymer Bevill, Jr.

发明人： Kenneth J. Christensen ,  Frances E. Noel ,  Rudolf E. Rehquate ,  Thomas Stammely ,  Jerry Dagher ,  Beymer Bevill, Jr.

IPC分类号： H04L1228

CPC分类号： H04L12/44 ,  H04L12/42

摘要： A multi-port LAN switch is provided that enables attached network devices to both communicate directly and to insert into a token-ring network through an attached concentrator. Each port of the multi-port LAN switch has a first transformer, a second transformer, and a switching system. The first transformer has a first winding connected to a first connection of the port. The second transformer has a first winding connected to a second connection of the port. The switching system switches to a port mode or an adapter mode as a function of a mode signal transmitted to the port In the adapter mode, the switching system connects a second winding of the first transformer to a transmitter circuit in the port, and its connects a second winding of the second transformer to a receiver circuit in the port. In the port mode, the switching system connects the second winding of the first transformer to the receiver circuit in the port, and it connects the second winding of the second transformer to the transmitter circuit in the port. Each port of the multi-port LAN switch further includes a DC voltage source that is switchably connected to the first connection of the port through a first switch. Each port further includes a second switch that connects the second connection of the port to a DC return-path in a first position, and connects the second connection to the first connection when in a second position.

摘要翻译： 提供了一种多端口LAN交换机，使连接的网络设备能够直接通信，并通过附加的集中器插入令牌环网络。 多端口LAN交换机的每个端口具有第一变压器，第二变压器和开关系统。 第一变压器具有连接到端口的第一连接的第一绕组。 第二变压器具有连接到端口的第二连接的第一绕组。 交换系统根据发送到端口的模式信号切换到端口模式或适配器模式在适配器模式下，开关系统将第一变压器的第二绕组连接到端口中的发送器电路，并且其连接 第二变压器的第二绕组到端口中的接收器电路。 在端口模式下，开关系统将第一变压器的第二绕组连接到端口中的接收器电路，并将第二变压器的第二绕组连接到端口中的发射器电路。 多端口LAN交换机的每个端口还包括直流电压源，其通过第一开关可切换地连接到端口的第一连接。 每个端口还包括第二开关，该第二开关将端口的第二连接连接到第一位置的直流回路，并且当处于第二位置时将第二连接连接到第一连接。

公开(公告)号：US5680397A

公开(公告)日：1997-10-21

申请号：US402740

申请日：1995-03-13

申请人： Kenneth J. Christensen ,  Francis E. Noel ,  Rudolf E. Rehquate ,  Thomas Stammely ,  Jerry Dagher ,  Beymer Bevill, Jr.

发明人： Kenneth J. Christensen ,  Francis E. Noel ,  Rudolf E. Rehquate ,  Thomas Stammely ,  Jerry Dagher ,  Beymer Bevill, Jr.

IPC分类号： H04L12/42 ,  H04L12/44 ,  H04L12/16

CPC分类号： H04L12/44 ,  H04L12/42

摘要： A multi-port LAN switch is provided that enables attached network devices to both communicate directly and to insert into a token-ring network through an attached concentrator. Each port of the multi-port LAN switch has a first transformer, a second transformer, and a switching system. The first transformer has a first winding connected to a first connection of the port. The second transformer has a first winding connected to a second connection of the port. The switching system switches to a port mode or an adapter mode as a function of a mode signal transmitted to the port. In the adapter mode, the switching system connects a second winding of the first transformer to a transmitter circuit in the port, and its connects a second winding of the second transformer to a receiver circuit in the port. In the port mode, the switching system connects the second winding of the first transformer to the receiver circuit in the port, and it connects the second winding of the second transformer to the transmitter circuit in the port. Each port of the multi-port LAN switch further includes a DC voltage source that is switchably connected to the first connection of the port through a first switch. Each port further includes a second switch that connects the second connection of the port to a DC return-path in a first position, and connects the second connection to the first connection when in a second position.

摘要翻译： 提供了一种多端口LAN交换机，使连接的网络设备能够直接通信，并通过附加的集中器插入令牌环网络。 多端口LAN交换机的每个端口具有第一变压器，第二变压器和开关系统。 第一变压器具有连接到端口的第一连接的第一绕组。 第二变压器具有连接到端口的第二连接的第一绕组。 交换系统根据发送到端口的模式信号切换到端口模式或适配器模式。 在适配器模式中，开关系统将第一变压器的第二绕组连接到端口中的发射器电路，并且将第二变压器的第二绕组连接到端口中的接收器电路。 在端口模式下，开关系统将第一变压器的第二绕组连接到端口中的接收器电路，并将第二变压器的第二绕组连接到端口中的发射器电路。 多端口LAN交换机的每个端口还包括直流电压源，其通过第一开关可切换地连接到端口的第一连接。 每个端口还包括第二开关，该第二开关将端口的第二连接连接到第一位置的直流回路，并且当处于第二位置时将第二连接连接到第一连接。

公开(公告)号：US5802151A

公开(公告)日：1998-09-01

申请号：US632946

申请日：1996-04-16

申请人： Beymer Bevill, Jr. ,  William James Kalin ,  Todd Morgan Rasmus ,  James William Sylivant ,  Peter Roy Tomaszewski

发明人： Beymer Bevill, Jr. ,  William James Kalin ,  Todd Morgan Rasmus ,  James William Sylivant ,  Peter Roy Tomaszewski

IPC分类号： H04L12/26 ,  H04M11/06 ,  H04M11/00

CPC分类号： H04M11/06 ,  H04L43/0811

摘要： A telephone interface protection circuit and modem incorporating the telephone interface protection circuit. The circuit includes a sensing circuit and a determining circuit. The interface protection circuit checks for an active telephone line and checks the line for over-current conditions caused when a modem designed for the public switched telephone network is plugged into a private digital telephone network. The circuit functions when the modem is operating to provide continuous monitoring. It can be built as a stand-alone device or incorporated into a modem. The circuit notifies the user of the line condition either with LEDs or with a status message sent to the user via the host computer interface.

摘要翻译： 电话接口保护电路和调制解调器结合电话接口保护电路。 电路包括感测电路和确定电路。 接口保护电路检查有效的电话线路，并检查线路是否设计用于公共交换电话网络的调制解调器插入专用数字电话网络时引起的过电流状况。 当调制解调器运行时提供连续监控，该电路起作用。 它可以构建为独立设备或并入调制解调器。 该电路通过LED或具有通过主机接口发送给用户的状态消息向用户通知线路状况。