VoIP phone calls are usually delivered over a carefully-managed network often running Quality of Service (QoS) and the Session Initiation Protocol (SIP).

An Internet T1 (also spelled Internet T-1) is a high-speed digitally transmitted connection to the Internet that transfers signals at 1.544 Mbps (1,544,000 bits per second) that can be divided into twenty-four 64 Kbps telephone lines or trunks.

Voice over Internet Protocol (VoIP) service that sets up telephone calls over the Internet that are often billed at a flat rate and leverage subscribers existing broadband Internet connection. This saves money in that only one connection is needed for both voice (phone) and data (Internet) service.

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) is a data network protocol that uses Class of Service (CoS) to prioritize different types of data packets across a shared network to facilitate the convergence of voice, video and data applications.

Internet access via Ethernet is becoming more and more popular to meet the growing demand for dynamic high bandwidth increases. For example, an increase from 10 to 100 Mbps can be accomplished by a High Speed Internet over Ethernet provider by simple changing the settings on already installed Ethernet switches. This scalability is cost effective for customers in that bandwidth can be increased or decreased quickly and easily, on demand, without the necessity of adding or changing datacom equipment as would be required with T1 / T3 or E1 / E3 local access lines.

POTS local loop speed is increased by up to 50 times when a DSL modem is attached at the customer premise and a Digital Subscriber Line Access Multiplexer (DSLAM) is connected to the local access loop at the local telephone company central office (CO).

Wireless Internet is a new way to access the Internet at high speeds from anywhere in the United States. Wireless Internet is delivered via terrestrial transmitters and receivers or by satellites that orbit the Earth while transmitting and receiving high frequency radio internet data to a small dish located at the customer premise. Two-way satellite radio system is reliable, easy to set up and is mobile. You can move the subscriber terrestrical or satellite dish and re-connect with ease.

If you are looking for clear, concise definitions of telecommunication terms and explanations of telecom services, especially how they are used and how they work, TelecomLInks is a great place to start.

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