公开(公告)号：US06587473B2

公开(公告)日：2003-07-01

申请号：US09930178

申请日：2001-08-16

申请人： John Brian Terry ,  Roger St. Patrick Richards

发明人： John Brian Terry ,  Roger St. Patrick Richards

IPC分类号： H04L12413

CPC分类号： H04L12/40032 ,  H04L12/403 ,  H04L12/413 ,  H04L2212/00 ,  H04M11/062

摘要： Access to a CSMA/CD (Carrier Sense Multiple Access with Collision Detection) network is provided via a telephone line by providing a master modem at the head end and a slave modem at the subscriber end of the line. The master modem provides a CSMA/CD interface to the network and controls half duplex communications with the slave modem via the line to avoid collisions of information packets on the line. The information packets are enveloped in frames on the line with error checking information; control information between the modems is contained in the same and/or in separate frames. The modulation method and signal bandwidth can be varied depending on errors to provide optimum communications capacity via any particular line, and a ratio of upstream to downstream information packets can be varied depending on buffer fills at the modems. The master modem can be multiplexed for multiple lines. The modulated signal frequencies are above telephone signal frequencies so that each line can be frequency diplexed for simultaneous telephone communications.

摘要翻译： 通过在头端提供主调制解调器和在线的用户端的从调制解调器，通过电话线路提供对CSMA / CD（具有冲突检测的载波侦听多路访问）网络的访问。 主调制解调器向网络提供CSMA / CD接口，并通过线路控制与从调制解调器的半双工通信，以避免信号包在线上的冲突。 信息包被包围在具有错误检查信息的行上的帧中; 调制解调器之间的控制信息包含在相同和/或分开的帧中。 调制方法和信号带宽可以根据错误而变化，以通过任何特定的线路提供最佳通信容量，并且上游信息分组的比例可以根据调制解调器上的缓冲器填充而变化。 主调制解调器可以多路复用为多条线路。 调制的信号频率高于电话信号频率，使得每条线路可以被频率双工以用于同时的电话通信。

公开(公告)号：US06327264B1

公开(公告)日：2001-12-04

申请号：US09251939

申请日：1999-02-18

申请人： John Brian Terry ,  Roger St. Patrick Richards

发明人： John Brian Terry ,  Roger St. Patrick Richards

IPC分类号： H04L12413

CPC分类号： H04L12/40032 ,  H04L12/403 ,  H04L12/413 ,  H04L2212/00 ,  H04M11/062

摘要： Access to a CSMA/CD (Carrier Sense Multiple Access with Collision Detection) network is provided via a telephone line by providing a master modem at the head end and a slave modem at the subscriber end of the line. The master modem provides a CSMA/CD interface to the network and controls half duplex communications with the slave modem via the line to avoid collisions of information packets on the line. The information packets are enveloped in frames on the line with error checking information; control information between the modems is contained in the same and/or in separate frames. The modulation method and signal bandwidth can be varied depending on errors to provide optimum communications capacity via any particular line, and a ratio of upstream to downstream information packets can be varied depending on buffer fills at the modems. The master modem can be multiplexed for multiple lines. The modulated signal frequencies are above telephone signal frequencies so that each line can be frequency diplexed for simultaneous telephone communications.

摘要翻译： 通过在头端提供主调制解调器和在线的用户端的从调制解调器，通过电话线路提供对CSMA / CD（具有冲突检测的载波侦听多路访问）网络的访问。 主调制解调器向网络提供CSMA / CD接口，并通过线路控制与从调制解调器的半双工通信，以避免信号包在线上的冲突。 信息包被包围在具有错误检查信息的行上的帧中; 调制解调器之间的控制信息包含在相同和/或分开的帧中。 调制方法和信号带宽可以根据错误而变化，以通过任何特定的线路提供最佳通信容量，并且上游信息分组的比例可以根据调制解调器上的缓冲器填充而变化。 主调制解调器可以多路复用为多条线路。 调制的信号频率高于电话信号频率，使得每条线路可以被频率双工以用于同时的电话通信。

公开(公告)号：US5912895A

公开(公告)日：1999-06-15

申请号：US640705

申请日：1996-05-01

申请人： John Brian Terry ,  Roger St. Patrick Richards

发明人： John Brian Terry ,  Roger St. Patrick Richards

IPC分类号： H04J11/00 ,  H04L12/02 ,  H04L12/40 ,  H04L12/413 ,  H04L12/46 ,  H04M11/06

CPC分类号： H04L12/40032 ,  H04L12/413 ,  H04M11/062 ,  H04L12/403 ,  H04L2212/00

摘要： Access to a CSMA/CD (Carrier Sense Multiple Access with Collision Detection) network is provided via a telephone line by providing a master modem at the head end and a slave modem at the subscriber end of the line. The master modem provides a CSMA/CD interface to the network and controls half duplex communications with the slave modem via the line to avoid collisions of information packets on the line. The information packets are enveloped in frames on the line with error checking information; control information between the modems is contained in the same and/or in separate frames. The modulation method and signal bandwidth can be varied depending on errors to provide optimum communications capacity via any particular line, and a ratio of upstream to downstream information packets can be varied depending on buffer fills at the modems. The master modem can be multiplexed for multiple lines. The modulated signal frequencies are above telephone signal frequencies so that each line can be frequency diplexed for simultaneous telephone communications.