Patent ID: 6385030
Filing Date: 2002-05-07
Classification: H04M

Abstract:
A surge protection circuit for use in a broadband communication system carrying high-speed digital signals, comprising:a first line-side transmission wire; a second line-side transmission wire; a first equipment-side transmission wire; a second equipment-side transmission wire; a primary shunt protector coupled between the first and second line-side transmission wires and ground; a secondary shunt protector coupled between the first and second equipment-side transmission wires and ground; a first coordinating impedance circuit coupled between the first line-side transmission wire and the first equipment-side transmission wire, wherein the first coordinating impedance circuit comprises (a) a first inductor, (b) a first resistance device coupled in series with the first inductor, (c) a first capacitor coupled in series with the first resistance device, and (d) a second resistance device coupled in parallel with the first capacitor; a second coordinating impedance circuit coupled between the second line-side transmission wire and the second equipment-side transmission wire, wherein the second coordinating impedance circuit comprises (a) a second inductor, (b) a third resistance device coupled in series with the second inductor, (c) a second capacitor coupled in series with the third resistance device, and (d) a fourth resistance device coupled in parallel with the second capacitor; and a third capacitor coupled between the first equipment-side transmission wire and the second equipment-side transmission wire.