| 摘要 |
A peer network node, along with other peer network nodes, forms a higher-tiered optical network that transports wavelength division multiplexed traffic for multiple lower-tiered optical networks. The node comprises a plurality of dedicated bidirectional optical ports, including two or more lower-tiered ports and one or more peer ports. The node also comprises one or more hub-side bidirectional optical ports, and a switching circuit. The switching circuit is configured to distribute traffic received at the one or more hub-side ports to respective dedicated ports, for dedicated transport to one or more of the lower-tiered networks and peer network nodes. The switching circuit is also configured to direct any traffic received at the dedicated ports to the one or more hub-side ports for transport to a hub node, even if that traffic is actually destined for one of the lower-tiered networks to which a lower-tiered port is connected.
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