Unpowered twisted pair loopback circuit for differential mode signaling
First Claim
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1. An electronic circuit for receiving a differential mode signal on a first pair of conductors and transmitting a signal on a second pair of conductors, the circuit comprising:
- a first steering circuit responsive to the differential mode signal on the first pair of conductors for generating a signal on one of the second pair of conductors; and
a second steering circuit responsive to the differential mode signal on the first pair of conductors for generating a signal on the other of the second pair of conductors.
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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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Citations
36 Claims
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1. An electronic circuit for receiving a differential mode signal on a first pair of conductors and transmitting a signal on a second pair of conductors, the circuit comprising:
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a first steering circuit responsive to the differential mode signal on the first pair of conductors for generating a signal on one of the second pair of conductors; and
a second steering circuit responsive to the differential mode signal on the first pair of conductors for generating a signal on the other of the second pair of conductors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30)
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25. A method for controlling the loop back of a differential mode signal received at a network device on a first pair of conductors and transmitted from the network device on a second pair of conductors, the method comprising:
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receiving the differential mode signal;
applying the differential mode signal to a first steering circuit and a second steering circuit;
generating a first signal to be transmitted on a first one of the second pair of conductors with said first steering circuit; and
generating a second signal to be transmitted on a second one of the second pair of conductors with said second steering circuit.
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31. An apparatus for controlling the loop back of a differential mode signal received at a network device on a first pair of conductors and transmitted from the network device on a second pair of conductors, the apparatus comprising:
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means for receiving the differential mode signal;
means for applying the differential mode signal to a first steering circuit and a second steering circuit;
means for generating a first signal to be transmitted on a first one of the second pair of conductors with said first steering circuit; and
means for generating a second signal to be transmitted on a second one of the second pair of conductors with said second steering circuit. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification