Apparatus and method for isolating transients associated with a digital subscriber line
AssigneeEfficient Networks, Inc.
InventorChristopher Q. Eckert
Life of this patent
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Abstract
A communication apparatus includes circuitry operable to facilitate communication over a digital subscriber line. The apparatus also includes a filter operable to be coupled between the circuitry and the digital subscriber line. The filter has a corner frequency and is operable to attenuate transients associated with the circuitry when the apparatus is in use. The filter is tuned to an impedance of the circuitry.
Claims36
A communication apparatus comprising:
- a communication device coupled to a digital subscriber line and operable to facilitate communication over a digital subscriber line;
- and
- a filter operable to be coupled between the communication device and the digital subscriber line, the filter having a corner frequency and being operable to attenuate transients associated with the communication device when the communication device is in use, the filter tuned to an impedance of the communication device.
The communication apparatus of claim 1, wherein the filter comprises:
- a first filter element operable to be coupled in series between the digital subscriber line and the communication device;
- and
- a second filter element coupled in series with the first filter element and in parallel with the communication device.
- 4.. The communication apparatus of claim 3, wherein the first filter element comprises a filter inductor, and 25 wherein the second filter element comprises a filter capacitor.
In a system including a plurality of communication devices coupled to a digital subscriber line, a circuit operable to facilitate communication using the digital subscriber line comprises:
- a filter having a corner frequency and being operable to be coupled between one of the plurality of communication devices and the digital subscriber line, the filter also operable to attenuate transients associated with the communication device operating in an active state, the filter tuned to an impedance of the communication device coupled thereto;
- and
- a switch coupled to the filter and operable to effect a change in the corner frequency of the filter depending on whether the communication device coupled to the filter is operating in an active or an inactive state, the change in the corner frequency operating to attenuate parasitic interference associated with one or more others of the plurality of communication devices operating in the inactive state when at least one of the plurality of communication devices switches to an active state.
A method for manufacturing a communication apparatus, comprising:
- determining an impedance of a communication device coupled to a digital subscriber line and operable to facilitate communication over a digital subscriber line;
- forming a filter operable to be coupled between the digital subscriber line and the communication device, the filter having a corner frequency and being operable to attenuate transients associated with the communication device when the communication device is in use, the filter tuned to the impedance of the communication device;
- and
- coupling the filter to the communication device.
Dependencies are inferred from the claim text.