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Unformatted text preview: 8.4 Multivendor Interoperability 479 Thus, a 10 Gb/s connection between two nodes that is carried through without any electronic multiplexing/demultiplexing would be considered a lightpath. Each link between OLTs or OADMs represents an optical multiplex section (OMS) carrying multiple wavelengths. Each OMS in turn consists of several link segments, each segment being the portion of the link between two optical amplifier stages. Each of these portions is an optical transmission section (OTS). The OTS consists of the OMS along with an additional optical supervisory channel (OSC), which we will study in Section 8.5.7. OTNs optical layer provides optical links to the electronic layer through the OCh layer. In the OTN architecture, the electronic layer above OTNs OCh layer is its optical channel transport unit (OTU) layer, which deals with individual optical links. The electronic sublayer above the OTU layer is the optical channel data unit (ODU) layer, which is for connections composed of multiple optical links. Note that the OTN electronic layer can be replaced with other client layer protocols such as SONET. SONETs section layer has the same role as OTNs OTU layer, and SONETs line and path layers have similar roles as OTNs ODU layer....
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- Spring '09