Multi-stage packet switching system with alternate traffic routing
First Claim
1. A multi-stage switch comprising:
- a plurality of ingress switching modules to receive data and to generate frames that are transmitted as a wavelength division multiplexed signal;
a core switching module operatively connected to receive the wavelength division multiplexed signal from the at least one ingress switch module and to switch the frames; and
a plurality of egress switching modules to receive the wavelength division multiplexed signal from the core switch module and to transmit data, wherein the switch is capable of detecting faulty paths and transmitting data through fault-free paths.
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Abstract
In general, in one aspect, the disclosure describes a multi-stage switch having a plurality of ingress switching modules to receive data and to generate frames that are transmitted as a wavelength division multiplexed signal. The multi-stage switch further includes a core switching module operatively connected to receive the wavelength division multiplexed signal from the at least one ingress switch module and to switch the frames. The multi-stage switch additionally includes a plurality of egress switching modules to receive the wavelength division multiplexed signal from the core switch module and to transmit data. The multi-stage switch is capable of detecting faulty paths and transmitting data through fault-free paths.
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Citations
32 Claims
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1. A multi-stage switch comprising:
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a plurality of ingress switching modules to receive data and to generate frames that are transmitted as a wavelength division multiplexed signal;
a core switching module operatively connected to receive the wavelength division multiplexed signal from the at least one ingress switch module and to switch the frames; and
a plurality of egress switching modules to receive the wavelength division multiplexed signal from the core switch module and to transmit data, wherein the switch is capable of detecting faulty paths and transmitting data through fault-free paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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receiving data at a multistage switch, wherein the multistage switch includes a plurality of ingress switching modules, a core switching module operationally connected to the plurality of ingress switching modules, and a plurality of egress switching modules operationally connected to the core switching module;
within the ingress switching modules, switching the data, aggregating the data destined for different egress switching module into frames, generating wavelength-division multiplexed (WDM) optical signals from the frames, and transmitting the WDM optical signals to the core switching module;
switching the WDM optical signals through the core switch module via multiple channels;
within the egress switching modules, receiving the WDM optical signals, extracting frames from the WDM optical signals, switching the data, and transmitting the data to destinations;
detecting faulty paths; and
switching data through fault-free paths. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A store and forward device comprising
a plurality of Ethernet cards to receive data from and transmit data to external sources; - and
a multistage switch to switch data between Ethernet cards, the multistage switch including at least one ingress switch module to receive data from the Ethernet cards, segment them, aggregate them into frames, and transmit the frames over optical wavelength division multiplexed channels;
a core switch module operatively connected to receive the wavelength division multiplexed optical signals from the at least one ingress switch module and to switch the frames carried therein; and
at least one egress switch module to receive the wavelength division multiplexed signals from the core switch module, extract segments from them, switch the segments to the destination ports, reassemble the segments arriving at the destination ports into packets, and to transmit the packets to the Ethernet cards, wherein the multistage switch is capable of detecting faulty paths and transmitting data through fault-free paths. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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Specification