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Advancements in Long Distance IP/WDM Networks: Cost-Effective Solutions and Compatibility

This document outlines the critical considerations in the development of long-distance IP/WDM networks, emphasizing the high costs associated with fiber infrastructure and wavelengths. It discusses the role of electronics in signal multiplexing to optimize fiber usage and the ongoing relevance of SONET multiplexers in achieving higher data rates. The paper highlights key aspects of metropolitan IP/WDM deployment, including distance challenges, data rates, and the importance of WDM’s wavelength protection against fiber failures. The use of simplified SONET as a framing protocol ensures compatibility with existing systems.

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Advancements in Long Distance IP/WDM Networks: Cost-Effective Solutions and Compatibility

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  1. Prepared For:GLOBCOM’99 Telcordia Contact:Richard Cardwell 732-758-2993 December 6,1999 IP/WDM Development An SAIC Company

  2. Long Distance IP/WDM • Cost of fiber and wavelengths is very high • Majority of network cost is in fiber plant • Electronics is used for multiplexing signals to minimize fiber requirements • Doubtful a network element will have 10 Gb/s demand to a foreign network element • SONET multiplexer will still be used to raise data rate even with IP/WDM • IP/WDM should employ SONET for layer 2 to remain compatible with SONET and enable multiplexing to higher rates • Some equipment may directly interface with WDM, depending on cost

  3. Long Distance IP/WDM Networks WDM OC3 SONET MUX 10 Gb/s line rate OC12 WDM OC48 SONET MUX 10 Gb/s line rate OC48

  4. Metropolitan IP/WDM • Distance are short - on the order of 10-20 km. • Rates between switches are on the order of DS3 or OC3 • SONET commonly used for electrical multiplexing • WDM direct interface is economic at OC12 levels today, OC3 in the future • Many inexpensive wavelengths will relatively low data rates • WDM provides wavelength protection • IP/WDM will still use SONET to remain compatible with existing equipment

  5. OC3 SONET MUX 2.4 Gb/s line rate DS3 Metropolitan IP/WDM WDM MUX OC3 40 Wavelengths DS3

  6. IP/WDM • Use simplified SONET as a framing protocol to remain compatible with existing equipment • WDM protection capability is important to protect against fiber failures

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