The world of telecommunications is driven by changes in consumption patterns. These include changes from legacy TDM to VoIP, from TDM leased lines to Layer 1, Layer 2, and Layer 3 VPNs, from TDM-based 2G and 2.5G mobile networks to data-centric 3G networks, and from simple best effort high-speed Internet access to advanced triple play networks for small and medium businesses and home use. The need for data connectivity across the WAN/MAN is ever growing. Enterprises with geographically distributed offices want to expand their Ethernet-based LANs to connect remote branches to their headquarters, and their business to the Internet.
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