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    • 3. 发明授权
    • WDM ring transmission system having two hubs
    • WDM环形传输系统有两个集线器
    • US06426815B1
    • 2002-07-30
    • US09152741
    • 1998-06-19
    • Steffen Koehler
    • Steffen Koehler
    • H04B1020
    • H04J14/0293H04J14/0204H04J14/0209H04J14/0212H04J14/0213H04J14/0283H04J14/0286H04J14/0289H04J14/0297
    • A WDM ring transmission system is provided having two hubs. Identical groups of optical signals for transmission along the ring are input to both hubs, but one of the hubs includes optical switches for selectively passing one of the groups of optical signals to the WDM ring. Accordingly, if a fault occurs in one of the network-hub connections or one of the hubs becomes defective, the switches couple optical signals from the operational hub to the WDM ring. In addition, optical signals emitted by nodes coupled to the WDM ring are output from both hubs, thereby insuring that signals can be output from, and input to, the ring even if one of the hubs fails.
    • 提供具有两个集线器的WDM环传输系统。 沿着环形传输的相同的光信号组被输入到两个集线器,但是集线器中的一个包括用于选择性地将光信号组中的一个通过WDM环的光开关。 因此,如果在一个网络集线器连接中发生故障或集线器中的一个故障,则开关将来自可操作集线器的光信号耦合到WDM环。 此外,由耦合到WDM环的节点发射的光信号从两个集线器输出,从而确保即使其中一个集线器发生故障,信号也可以从环路输出并输入到环路。