| 摘要 |
An optical network includes an access ring, a local ring, one or more add/drop nodes (ADNs), a first gateway and a second gateway. The access ring couples the plurality of gateways and transmits optical signals to and from the gateways, the optical signals comprising multiple wavelengths each wavelength operable to carry traffic. The local ring couples one or more of the ADNs and transmits optical signals to and from the ADNs. Additionally, the ADNs are capable of adding and dropping traffic to and from the local ring in one or more wavelengths. The first gateway is capable of receiving broadcast traffic on the access ring, the broadcast traffic transmitted in one or more wavelengths of the optical signals transmitted on the access ring and forwarding, on the access ring, a first copy of the broadcast traffic received on the access ring. The first gateway is further capable of forwarding, to the local ring, a second copy of the broadcast traffic received on the access ring The second gateway is capable of receiving local traffic originating from one or more of the ADNs on the local ring and forwarding the local traffic to the access ring. The second gateway is further capable of receiving, from the local ring, broadcast traffic forwarded to the local ring by the first gateway and terminating the broadcast traffic received from the local ring.
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