Architectural Considerations for Backhaul of 2G/3G and Long Term Evolution Networks
This white paper will initially discuss the migration trends that Cisco sees in Europe in relation to the transport options for Second-Generation (2G) and Third-Generation (3G) traffic. A more detailed analysis will then examine the options available for transporting Global System for Mobile Communications (GSM)/2G (time-division multiplexing [TDM] based) and Universal Mobile Telecommunications Service (UMTS)/3G traffic (ATM and Ethernet based) over a converged packet network. Finally, a detailed description will discuss the LTE evolution and the feature requirements it makes on the underlying transport network. A conclusion summarizes the advantages and disadvantages of different transport options (Layer 2 VPN and Layer 3 VPN) under consideration today.