IP over SONET1 technology is being deployed today in IP backbone netwo
rks to provide efficient, cost-effective, high-speed transport between
fast routers. The authors present an overview of the architectural co
nsiderations in the deployment of IP over SONET technology. In additio
n, an overview of the recent developments in IP over SONET interface d
esign and specification is provided. Finally, the authors conclude wit
h an examination of the future of high-speed Internet transport.