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 T3 (also spelled Internet T-3) is a broadband Internet connection that transfers signals at a rate of 45 Mbps. Both Internet T1 and T3 services are highly-reliable circuits that are usually guaranteed by a Service Level Agreement.

Voice over IP (VoIP) sends voice data in packets using the Internet Protocol (IP) instead of analog waves as does plain old telephone service (POTS) lines.

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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.

Connect your business local area network (LAN) to the Internet using the same protocol that operates on your LAN: Ethernet. This increasingly popular Internet access solution makes it easy to connect all of the computers on your LAN at your company to the Internet with minimal configuration and cost.

Digital Subscriber Line (DSL) is a voice and data access service that supports both voice and data communication across a copper plain old telephone serivce (POTS) line and significantly increases the digital capacity of analog POTS access lines.

On Telecom Links, you can learn how an Internet T1 works and why it is more reliable than DSL or cable.

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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.