| 摘要 |
Standard interfaces of computers and peripherals are networked over telephone wires (2', 5') via a local area network (LAN) comprising a floating ground circuit. The LAN comprises modular interconnecting units and modular plugs (50) and jacks (12, 14) in combination with an isolation transformer (30) having a low interwinding capacitance and inertia. The LAN utilizes the ringing characteristic superimposed on signal pulses' leading or trailing edges for enhanced long range detectability and establishes a noise resistant droop of the pulses' leading or trailing edges. The modular LAN construction permits the use of standard 4-wire telephone line with one pair used for telephone and the other pair used for the network. The network can be connected in various topologies. The LAN system enables reliable interconnects to over 5,000 feet using in-place telephone grade wiring thereby substantially cutting the cost of installation or modification of a local area network. |
