We review technologies and architectures for WDM optical IP networks from the viewpoint of
capital expenditure and network energy consumption. We show how requirements of low …

Feature Issue on High Availability in Optical Networks The availability requirements for
today's networks are very high. Higher availability often comes with a higher cost. We …

Economical and operational facets of networks drive the necessity for significant changes
towards fundamentals of networking architectures. Recently, the momentum of …

Most network operators have considered reducing LSR label spaces (number of labels
used) as a way of simplifying management of underlaying virtual private networks (VPNs) …

Ethernet is a permanent success story, extending its reach from LAN and metro areas now
also into core networks. 100 Gbit/s Ethernet will be the key enabler for a new generation of …

Providing differentiated quality of service became more and more important. This is not only
because some service requests a high quality and real time transportation, but also because …

Most of the world's traffic is now packet-based. While SONET/SDH transport technology
continues to evolve, there are now major standardization efforts to develop a native packet …

With the continuous growth of traffic in Internet Protocol (IP) networks, the issue of energy
consumption in these networks has been growing in importance.“Next-generation networks” …

The Automatically Switched Optical Networks (ASONs) and the Generalized Multi Protocol
Label Switching (GMPLS) control plane are envisaged to play an important role in the next …

Increased competition in the telecommunications industry pushes network operators to
rationalize their total costs. Models and simulations appear as major tools aiming at better …