| 摘要 |
An upgradeable optical hub and hub upgrade can be provided. The upgradeable hub can separate an incoming signal into various components and provide a segment of the incoming signal to a port for a hub upgrade. The hub can drop, for example, four channels to four external nodes. Hub upgrade can separate an incoming signal into various bands, and can drop, for example, four channels to four external nodes. The upgradeable hub, thus, can be upgraded by adding the hub upgrade, without the need for discarding the original hub when performing a hub upgrade.
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