Communication system with cost based protection
First Claim
1. A communication system comprising:
- a first communication device and a second communication device;
a first optical switch and a second optical switch;
a first link coupling the first communication device to the first optical switch, and a second link coupling the second communication device to the second optical switch;
a third link coupling the first optical switch to the second optical switch, wherein during normal operation, the first optical switch connects the first link to the third link and the second optical switch connects the third link to the second link;
a plurality of back-up links coupling the first optical switch to the second optical switch, wherein the back-up links have various monetary costs and latencies; and
in response to a fault on the third link, the first optical switch and the second optical switch are configured to automatically select an available one of the back-up links having a lowest monetary operating cost and an acceptable latency, and in response to the selection, to automatically disconnect the first link and the second link from the third link and automatically connect the first link and the second link to the selected back-up link;
wherein the first communication device is configured to provide Open Systems Interconnect (OSI) layer 2/3 protection in response to a carrier delay timer time-out, wherein the carrier delay timer is set based on a time period that allows the first optical switch and the second optical switch to detect the fault and implement the selected back-up link; and
wherein the time period comprises a detection time period to detect the fault, a switch time period to select the selected back-up link, and a restoration time period for a signal to propagate over the selected back-up link.
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Accused Products
Abstract
A communication system comprises a first communication device coupled to a first optical switch by a first link, a second communication device coupled to a second optical switch by a second link, and a third link and back-up links coupling the first and second optical switches. During normal operation, the optical switches connect the third link to the first and second links. The back-up links have various costs and latencies. In response to a fault on the third link, the first optical switch and the second optical switch automatically select an available one of the back-up links having a lowest cost and an acceptable latency, and in response to the selection, automatically disconnect the first link and the second link from the third link and automatically connect the first link and the second link to the selected back-up link.
14 Citations
16 Claims
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1. A communication system comprising:
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a first communication device and a second communication device; a first optical switch and a second optical switch; a first link coupling the first communication device to the first optical switch, and a second link coupling the second communication device to the second optical switch; a third link coupling the first optical switch to the second optical switch, wherein during normal operation, the first optical switch connects the first link to the third link and the second optical switch connects the third link to the second link; a plurality of back-up links coupling the first optical switch to the second optical switch, wherein the back-up links have various monetary costs and latencies; and in response to a fault on the third link, the first optical switch and the second optical switch are configured to automatically select an available one of the back-up links having a lowest monetary operating cost and an acceptable latency, and in response to the selection, to automatically disconnect the first link and the second link from the third link and automatically connect the first link and the second link to the selected back-up link; wherein the first communication device is configured to provide Open Systems Interconnect (OSI) layer 2/3 protection in response to a carrier delay timer time-out, wherein the carrier delay timer is set based on a time period that allows the first optical switch and the second optical switch to detect the fault and implement the selected back-up link; and wherein the time period comprises a detection time period to detect the fault, a switch time period to select the selected back-up link, and a restoration time period for a signal to propagate over the selected back-up link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a communication system, the method comprising:
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providing a first communication device and a first optical switch with a first link coupling the first communication device to the first optical switch; providing a second communication device and a second optical switch with a second link coupling the second communication device to the second optical switch; providing a third link coupling the first optical switch to the second optical switch, wherein during normal operation, the first optical switch connects the first link to the third link and the second optical switch connects the third link to the second link; providing a plurality of back-up links coupling the first optical switch to the second optical switch, wherein the back-up links have various monetary costs and latencies; and in response to a fault on the third link, automatically selecting an available one of the back-up links having a lowest monetary operating cost and an acceptable latency; and in the first optical switch and the second optical switch, automatically disconnecting the first link and the second link from the third link and automatically connecting the first link and the second link to the selected back-up link; wherein the first optical switch is configured to provide Open Systems Interconnect (OSI) Layer 1 protection in response to a loss of signal, the first communication device is configured to provide OSI layer 2/3 protection in response to a carrier delay timer time-out, and further comprising setting the carrier delay timer based on a time period that allows the OSI layer 1 protection to complete; and wherein the time period comprises a detection time period to detect the fault, a switch time period to select the selected back-up link, and a restoration time period for a signal to propagate over the selected back-up link. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification