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NE40E V800R010C00 Feature Description - WAN Access 01

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In the traditional typical IP+DWDM networking solution, a router outputs gray (colorless) optical signals to an OTU's user-side interface. The OTU converts gray optical signals into standard colored optical signals. The post-conversion colored optical signals are then output to the multiplexer (MUX).

The data link and transport layers are isolated, as shown in Figure 8-4.

Figure 8-4  Typical IP+DWDM networking solution
Gray (colorless) light interfaces on the router are LAN, WAN, or POS.

In the colored interface feature, colored optical modules are installed on the NE40E's interfaces and directly output colored optical signals that comply with ITU-T G.694 standard. Each interface has a different wavelength of transmit optical signals. The multiplexer (MUX) multiplexes optical signals with specific wavelengths from multiple interfaces. The demultiplexer (DMUX) demultiplexes optical signals with multiple wavelengths from one interface and sends them out of multiple interfaces. Optical signals with each wavelength reach the corresponding interface with the same wavelength on the receive router. As Figure 8-5 shows, the transmission process saves OTU on the DWDM, with no isolation between data link and transport layers.

Figure 8-5  Colored interface feature
To satisfy long-distance transmission, the router must provide OTN interfaces (OTUk) that have strong error correction capabilities.
Updated: 2018-07-04

Document ID: EDOC1100027168

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