See channelized T1.

In telecommunications, a portion of the 1.544 Mb/s (T1-aggregate) bit stream; the available fractions being determined by the type of multiplexer used to achieve the T1 aggregate bit stream.

A service in which a customer can use less than 24 channels on a T1 line without paying the cost of the entire line.

The use of bandwidth in 64K bps (DS0) increments up to 1.544M bps from a T1 facility. Frame

Fractional T1 is a fraction or part of a T1 line. In data transmission, T1 is one of the many kinds of transmission lines that transport high-quality data at a lightning-fast rate. A T1 line has 24 ch [..]

FT1 is a leased-line service that provides data rates from 64 Kbps to 1.544 Mbps, by allowing a user to purchase one or more channels of a T1 link. If a customer needs less bandwidth than 1.544 Mbps, FT1 is a low-cost alternative to purchasing a full T1.

In the North American or Japanese hierarchies, the tariffed use of a data rate corresponding to fewer than the 24 channels served by a T1 line.