| 摘要 |
A fiber-optic WDM ring carries communication traffic among a plurality of nodes, each node associated with respective subscriber premises. The WDM ring includes an optical add-drop module (OADM) at each node for adding and dropping signals associated with that node. The WDM ring also includes active terminal equipment at each node for conditioning incoming and outgoing data and for converting between the optical and electrical domains. The OADM at each of at least some nodes, to be referred to as enhanced nodes, is situated at a site physically separated from the powered terminal equipment, and is coupled to the powered terminal equipment via an optical medium. At each enhanced node, traffic not destined for that node is routed through no more than one enclosure on subscriber premises that requires a connection. If there is such enclosure, it contains the OADM.
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