Passive CMTS redundancy
First Claim
Patent Images
1. A cable modem termination system (CMTS), comprising:
- two or more primary CMTS transceivers, each for transceiving communications through a primary signal path;
a plurality of directional couplers connected to the primary CMTS transceivers in the primary signal path; and
one backup CMTS transceiver selectively connected to the plurality of directional couplers outside of the primary signal path.
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Accused Products
Abstract
Cable modem termination systems (CMTS) having directional couplers in the primary signal path facilitate redundancy without the need for active components, e.g., switches or amplifiers, in the primary signal path. The use of directional couplers in the primary signal path allows a backup CMTS transceiver to provide redundancy to multiple primary CMTS transceivers through the use of switching outside of the primary signal path. Additional directional couplers in the backup signal path may be used to allow testing and maintenance of the backup CMTS transceiver without disturbing the primary signal path.
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Citations
40 Claims
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1. A cable modem termination system (CMTS), comprising:
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two or more primary CMTS transceivers, each for transceiving communications through a primary signal path;
a plurality of directional couplers connected to the primary CMTS transceivers in the primary signal path; and
one backup CMTS transceiver selectively connected to the plurality of directional couplers outside of the primary signal path. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A redundancy system for a cable modem termination system (CMTS), comprising:
a first directional coupler comprising a first port for connecting to a communication line, a second port connected to a first CMTS transceiver for transceiving communications on the communication line in a first operation mode and a third port selectively connected to a backup CMTS transceiver for transceiving communication on the communication line in a second operation mode. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A cable modem termination system (CMTS), comprising:
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at least one primary CMTS transceiver, each primary CMTS transceiver comprising one or more upstream communication ports for communication with subscriber equipment and one or more downstream communication ports for communication with a head end;
at least one backup CMTS transceiver, each backup CMTS transceiver comprising one or more upstream communication ports for communication with the subscriber equipment and one or more downstream communication ports for communication with the head end; and
a plurality of directional couplers, with a directional coupler connected to each communication port of the primary CMTS transceivers;
wherein each communication port of a backup CMTS transceiver is selectively connected to a directional coupler of a corresponding communication port of at least one primary CMTS transceiver. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of providing redundancy in a cable modem termination system (CMTS), comprising:
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passing communications through a directional coupler to a primary CMTS transceiver during a first operation mode; and
passing the communications through the directional coupler to a backup CMTS transceiver during a second operation mode. - View Dependent Claims (32, 33, 34)
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35. A method of operating a cable modem termination system (CMTS), comprising:
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communicating with one or more primary CMTS transceivers across a primary signal path during a first operation mode, wherein each primary CMTS transceiver has one or more upstream communication ports for communication with subscriber equipment and one or more downstream communication ports for communication with a head end, and wherein a directional coupler is connected between each upstream communication port and the subscriber equipment and between each downstream communication port and the head end;
detecting a failure of one of the primary CMTS transceivers; and
entering a second operation mode wherein communication with the failed primary CMTS transceiver is routed through a backup CMTS transceiver through the directional couplers associated with the failed primary CMTS transceiver. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification