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NE40E V800R010C00 Feature Description - WAN Access 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Principles

Principles

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

Document ID: EDOC1100027168

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