H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 9/00 (2006.01) H04B 15/00 (2006.01) H04M 3/18 (2006.01)
Patent
CA 2316550
A surge protection circuit is coupled to the wires that transport digital signals between a local unit, such as an ONU, and a remote unit, such as a NID. The surge protection circuit includes a coordinating impedance having a capacitive element connected in series with the twisted pair wires coupling the ONU to the NID. The coordinating impedance couples a primary shunt protector and a secondary shunt protector. Various embodiments of the surge protection circuit comprise coordinating impedance devices including a series connected: capacitor and resistor, capacitor and inductor, and capacitor, inductor, and resistor. By using a capacitive element in the coordinating impedance, the signal loss through the surge protector is significantly reduced for 10 Base-T and 100 Base-T Ethernet systems. Further, the added inductance may become part of an integrated low-pass filter that further reduces signal loss at high frequencies.
Marconi Communications Inc.
Marconi Intellectual Property (ringfence) Inc.
Sim & Mcburney
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