VoIP glossary - T

The HipTel VoIP dictionary (VoIP glossary) was created to help our users understand common VoIP terminology. Use the search feature to look up VoIP terms, or look up terms alphabetically. Have a question, still unsure what something means? Feel free to contact us.

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T1 — Also referred to in the industry as a DS-1, is a high speed Internet connection. It is typically used to connect small and medium sized businesses to the Internet. One T1 line is capable of carrying data at 1.544 MB per second, or providing 24 digitized telephone lines.

T3 — Also referred to in the industry as a DS-3, is a high speed Internet connection. It is typically used to connect large sized businesses and institutions to the Internet. Many colleges use T3 lines to supply Internet to mass groups of people. A single T3 line can provide Internet browsing capabilities to thousands of people. A T3 line is the equivalent of 28 T1 lines. It is capable of carrying data at 43.232 MB per second, or providing up to 672 digitized telephone lines.

T568A — One of the two wiring schemes for wiring an RJ-45 modular plug. T568A has become the new standard because it provides backward compatibility to both one pair and two pair USOC wiring schemes. The only difference between T568A and T568B is that the orange and green pairs of wires are interchanged.

T568B — One of the two wiring schemes for wiring an RJ-45 modular plug. T568B is the older color code wiring scheme that was introduced in 2001. It has since been superseded by the new T568A wiring scheme. The only difference between T568A and T568B is that the orange and green pairs of wires are interchanged. It is also permitted by the ANSI/TIA/EIA standard, but it provides only a single pair backward compatibility to the USOC wiring scheme.

Transmission Control Protocol (TCP) — Is one of the protocols for exchanging data packets. This protocol guarantees reliable and accurate data from the sender to the receiver. It also coordinates the retransmission of data packets that failed to reach the end user.