Systems and methods for suppressing radiofrequency noise from a modem

Patent metadata

Field	Value
Publication number	US-10680674-B2
Application number	US-201916299990-A
Country	US
Kind code	B2
Filing date	Mar 12, 2019
Priority date	May 22, 2018
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A cord for suppressing noise from a modem includes a hot wire, a neutral wire, and a signal balancing device. The hot wire is configured to connect to a hot power port of a modem. The neutral wire is configured to connect to a neutral power port of the modem. The signal balancing device is configured to connect to an outer conductor of a coaxial radiofrequency (RF) port of the modem and to the neutral wire or a ground wire. The signal balancing device is configured to balance RF signals transmitted through the coaxial RF port.

First claim

What is claimed is:

1. A system for suppressing noise from a modem, comprising:
a modem comprising:
a hot power port;
a neutral power port; and
a coaxial radiofrequency (RF) port comprising an inner conductor and an outer conductor, the coaxial RF port being configured to communicate signals with an external network; and

a cord comprising:
a hot wire configured to connect to the hot power port;
a neutral wire configured to connect to the neutral power port; and
a signal balancing device configured to connect to the outer conductor of the coaxial RF port and to the neutral wire or a ground wire, wherein the signal balancing device comprises:
a coaxial choke configured to attenuate a predetermined shield current of the signals via field conversion; and
a capacitor connected in series with the coaxial choke, wherein the capacitor is configured to balance the signals transmitted through the inner conductor and the outer conductor of the coaxial RF port.

2. The system of claim 1 , wherein the cord further comprises the ground wire, which is configured to be connected to a ground, wherein at least a portion of the signals are transmitted through the ground wire to the ground to prevent the portion of the signals from being transmitted into the external network, and wherein the external network comprises a cable television (CATV) system.

3. The system of claim 1 , wherein the neutral wire comprises a first portion and a second portion, wherein the first portion is configured to connect to the neutral power port, wherein the second portion is configured to connect to the outer conductor of the coaxial RF port, and wherein the capacitor and the coaxial choke are connected to the second portion.

4. The system of claim 3 , wherein the cord does not include the ground wire.

5. The system of claim 1 , wherein the cord reduces noise signals transmitted from the modem to a cable television (CATV) system from about 12 dB to about 20 dB.

6. The system of claim 1 , wherein the coaxial choke comprises a coaxial ferrite cable that is wrapped one or more times around a toroid.

7. A cord for suppressing noise from a modem, comprising:
a hot wire configured to connect to a hot power port of a modem;
a neutral wire configured to connect to a neutral power port of the modem; and
a signal balancing device configured to connect to an outer conductor of a coaxial radiofrequency (RF) port of the modem and to the neutral wire or a ground wire, wherein the signal balancing device is configured to balance RF signals transmitted through the coaxial RF port.

8. The cord of claim 7 , further comprising the ground wire, which is configured to be connected to the outer conductor of the coaxial RF port and to a ground, wherein the signal balancing device is connected to the ground wire, and wherein noise signals from the modem are transmitted through the ground wire to the ground to prevent the noise signals from being transmitted into a cable television (CATV) system.

9. The cord of claim 7 , wherein the neutral wire includes a first portion and a second portion, wherein the first portion is configured to connect to the neutral power port, wherein the second portion is configured to connect to the outer conductor of the coaxial RF port, and wherein the signal balancing device is connected to the second portion.

10. The cord of claim 7 , wherein the cord does not include the ground wire.

11. The cord of claim 7 , wherein the signal balancing device comprises a capacitor that is configured to complete a circuit loop for noise signals generated by the modem.

12. The cord of claim 11 , wherein the signal balancing device further comprises a coaxial choke connected in series with the capacitor and configured to connect to the outer conductor of the coaxial RF port, wherein the coaxial choke comprises a coaxial ferrite cable and a toroid, and wherein the coaxial choke is configured to attenuate the noise signals generated by the modem via field conversion through the coaxial ferrite cable, the toroid, or both.

13. The cord of claim 12 , wherein the coaxial choke is configured to balance differential signals flowing through the outer conductor of the cord.

14. The cord of claim 13 , wherein connecting the capacitor and the coaxial choke to the outer conductor of the coaxial RF port of the modem reduces the noise signals transmitted from the modem to a cable television (CATV) system from about 12 dB to about 20 dB.

15. A cord for suppressing noise from a modem, comprising:
a hot wire configured to connect to a hot power port of a modem;
a neutral wire configured to connect to a neutral power port of the modem; and
a signal balancing device comprising a capacitor, the signal balancing device being configured to be connected to an outer conductor of a coaxial radiofrequency (RF) port of the modem and to the neutral wire or a ground wire, wherein the signal balancing device is configured to balance RF signals transmitted through the coaxial RF port.

16. The cord of claim 15 , further comprising the ground wire, which is configured to be connected to the outer conductor of the coaxial RF port and to a ground, wherein the capacitor is connected to the ground wire, and wherein noise signals from the modem are transmitted through the ground wire to the ground to prevent the noise signals from being transmitted into a cable television (CATV) system.

17. The cord of claim 15 , wherein the neutral wire includes a first portion and a second portion, wherein the first portion is configured to connect to the neutral power port, wherein the second portion is configured to connect to the outer conductor of the coaxial RF port, and wherein the capacitor is connected to the second portion.

18. The cord of claim 17 , wherein the cord does not include the ground wire.

19. The cord of claim 15 , further comprising a coaxial choke configured to be connected in series with the capacitor, wherein the coaxial choke comprises a coaxial ferrite cable that is wrapped one or more times around a toroid, and wherein the coaxial choke is configured to attenuate noise signals generated by the modem via field conversion through the coaxial ferrite cable, the toroid, or both.

20. The cord of claim 15 , wherein connecting the signal balancing device to the outer conductor of the coaxial RF port of the modem reduces noise signals transmitted from the modem to a cable television (CATV) system from about 12 dB to about 20 dB.

Assignees

• Ppc Broadband Inc

Inventors

• Alkan Erdogan

Classifications

• H04B3/28 Primary

  Reducing interference caused by currents induced in cable sheathing or armouring · CPC title

• H04B3/42

  Circuits for by-passing of ringing signals · CPC title

• H04B3/50

  Systems for transmission between fixed stations via two-conductor transmission lines (H04B3/54 takes precedence) · CPC title

• H04B3/32 Primary

  Reducing cross-talk, e.g. by compensating · CPC title