| 单词 | SONET (Synchronous Optical NETwork) |
| 释义 | SONET (Synchronous Optical NETwork) specifies a network-to-network interface (NNI), also known as network node interface, that supports the interconnection of national and regional networks into a cohesive global network. The user network interface (UNI) provides a standard basis for connection from the user premises to a SONET/SDH local loop. Although SONET is a broadband optical specification, the signal originates in electrical format as a T3 signal to which additional signaling and control overhead is added to for the Synchronous Transport Signal level-N (STS-N). The term Optical Carrier-N (OC-N) applies once the electrical signal is converted to optical format. The SONET hierarchy begins with is OC-1 at a signaling rate of 51.84 Mbps, which is the equivalent of a T3 (44.736 Mbps) plus overhead, and currently tops out at the OC-768 nominal rate of 40 Gbps, which is the equivalent of 768 T3s plus overhead.Table S-2 details the SONET/SDH hierarchy. |
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