MPLS VPNs transport layer 2 packets across the network and encapsulate transport protocols such as ATM, Ethernet, and SONET, allowing MPLS networks to seemlessly upgrade and replace legacy layer 2 networks without requiring network reconfiguration or using protocols higher than layer 2. In comparison, layer 3 VPNs must use the layer 3 Internet Protocol (IP).

An Internet T1 (sometimes spelled T-1) is a high speed telecommunication line that can carry 24 digitalized voice channels, or it can carry data at a rate of 1.544 megabits per second.

VoIP over Internet Protocol (IP), or VoIP, is a managed voice and Internet solution for businesses that falls into the industry niche referred to as IP Centrex (a feature-rich hosted analog voice solution), or Hosted Private Branch Exchange (PBX) that provides many features and capabilities that transform business communications beyond what traditional voice and data networks can offer.

The ADSL downstream receiving rate from the Internet usually varies from 1.5 to 9Mbps while the upstream sending rate usually varies from 16 to 640 Kbps.

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Multiprotocol Label Switching (MPLS) can be used to create intelligent networks that support advanced data packet management over a single network while saving money. MPLS can be integrated seamlessly over any existing infrastructure such as IP, Frame Relay, ATM, or Ethernet and end users with different types of local access circuits may be joined together on the same network without changing their current access protocols.

Ethernet provides a great local access medum to connect LANs to the Internet and is quickly becoming the access method of choice were it is available.

Asymetric DSL (ADSL) allows more bandwidth to move data toward the end user (multimedia and text) than from the end user (mostly keystrokes and mouse behavior) to the Internet.

You can compare MPLS to Frame Relay and ATM technologies.

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MPLS can be used to facilitate layer 3 IP VPNs, layer 2 VPNs, Quality of Service (QoS), Class of Service (CoS) and to guarantee Service Level Agreements.