| 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, comprising multiple wavelengths carrying traffic, to and from the gateways. The local ring couples one or more of the ADNs and transmits optical signals to and from the ADNs. The first gateway receives broadcast traffic on the access ring and fowards, on the access ring, a first copy of the broadcast traffic received. The first gateway is further forwards, to the local ring, a second copy of the broadcast traffic received on the access ring The second gateway receives local traffic originating from one or more of the ADNs on the local ring and forwards the local traffic to the access ring. The second gateway further receives, from the local ring, broadcast traffic forwarded to the local ring by the first gateway and terminates the broadcast traffic received from the local ring. |
