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).

A T1 local access connection to the Internet that can be configured to carry either 24 digitized data channels or one aggregated concatenated data channel at a rate of 1.544 Megabits Per Second (Mbps) that is connected via a T1 Wan Interface Card (WIC), Channel Service Unit / Data Service Unit (CSU/DSU), and Internet router.

Hosted Voice over Internet Protocol (VoIP) is a voice and data technology that supports several telecommunications protocols, such as Session Initiation Protocol (SIP) and Internet Protocol (IP), that that makes it easy for people to use the Internet to make telephone calls while saving money on premise hardware.

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 network is particularly important to businesses running applications that require latency such as VoIP, ERP, SAP, etc.

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.

Digital Subscriber Line Service (DSL) has become a very popular Internet access service. This is because DSL uses the existing copper pairs that already exist between most customer premise offices and the local phone company central office (CO). A DSL connection is set up between a DSL modem at the customer premise and a DSL access multiplexer, or DSLAM, at the phone company central office. Both voice and data can be run across the same DSL connection by using a filter to separate voice traffic from Internet traffic.

Telecom Links reveals the secrets of telecom technology from the first radio to the latest fiber optic technologies.

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MPLS makes it easier to manage network for quality of service (QoS) because packets can be prioritized by business importance. For example, Voice over IP (VoIP) can be prioritized over email and web browsing packets.