Tuesday, August 25, 2009

T Lines


T-1 Lines A T-1 line is a dedicated line supporting data rates up to 1.544 Mbps - using 24 individual channels with each supporting 64 Kbps. An individual channel can carry voice or data traffi c, while a customer switching unit/ digital switching unit (CSU/DSU) is necessary toconnect the channel to the four wires that carry the information. The CSU/DSU sends the data signal to
the router which connects it to a server that may send it to the Internet via other servers. Lines
Repeaters must be in place every 6,000 feet or less to help prevent data signal degeneration (as diagrammed below).

Telephone companies, in general, allow customers to buy individual channels in increments of 56 Kbps (8 Kbps per channel is used for data management). A full T-1 connection can theoretically accommodate 200+ users and other provider services.

T-1 lines use copper wire and offer a popular option to businesses and smaller Internet service providers (ISPs) wanting to connect to the Internet and the Internet backbone (such as faster T-3 connections). Because of costs, T-1 service is generally not considered an effective method for reaching most rural areas or residential customers.

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