Unpowered twisted pair loopback circuit for differential mode signaling
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United States of America Patent
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Jan 10, 2012
Grant Date -
May 21, 2009
app pub date -
Nov 3, 2008
filing date -
Nov 29, 2000
priority date (Note) -
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Abstract
A method and apparatus provide an IP telephone or similar device with a mechanism to receive and at least briefly loop back discovery signals received from a telecommunications device such as an Ethernet switch while not permitting the loop back of data packet signals. No mechanical relays are required and the circuitry can be fully integrated on an integrated circuit using commonly available techniques, if desired.
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