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).

In a T1, each of the twenty-four 64 Kbps channels can connect to the Internet individually or the Internet T1 can be configured to aggregate all of the 24 channels into one large 1.544 Mbps concatenated channel.

Hosted VoIP eliminates the need to purchase or lease expensive PBX equipment to gain advanced calling features such as voicemail, automated attendants, extension dialing, call forwarding, call park, or call transfer. Hosted VoIP also eliminates the need to obtain service from multiple carriers for local and long distance calling, PBX tie-lines, private lines, etc. The service also includes Internet access and Quality of Service (QoS) to guarantee voice quality all on one invoice. Hosted VoIP offers freedom from legacy equipment costs, eliminates reliance on slow-moving traditional phone companies, multiple bills, and offers flexibility to deliver customized user productivity solutions for your company.

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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MPLS VPNs use Multiprotocol Label Switching (MPLS) to set up Virtual Private Networks (VPNs) that can isolate data traffic to provide Class of Service (CoS), Quality of Service (QoS), and ease network administration with minimal network overhead. Layer 3 MPLS VPNs (L3VPNs) use BGP, traffic isolation and Virtual Routing / Forwarding (VRF) for network routing and security. MPLS VPNs are more efficient and robust than IPSec VPN, ATM, MPLS L3VPNs.

A major feature of Internet over Ethernet is the ease in which you can upgrade from 1 Mbps to 1 Gbps. Simply call your Internet Service Provider (ISP) and ask for an upgrade and it can be provisioned almost in real time. This service is the future of Internet access for the foreseable future.

DSL service is delverd as Asymmetric DSL (ADSL) which is the most common application for Internet access, where fast downstream is required, but slow upstream is acceptable, and as Symmetric DSL (SDSL) which supports high speed access across the local access loop in both directions.

You can compare MPLS to Frame Relay and ATM technologies.

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Layer 2 MPLS VPNs (L2VPNs) are similar to Frame Relay, Asynchronous Transfer Mode, or point-to-point Wide Area Networks (WANs).