CLFI name for a Digital Signal 1 (
DS1) a transmission line with bandwidth sufficient to carry 24 DS0 (64 or 56 Kbps depending on coding) channels.
Because of overhead a
T1 being delivered by a provider for data communications usually provides 1.344Mbps of bandwidth, whereas the
T1 consumes 1.544Mbps of bandwidth. With
B8ZS coding the
T1 can provide 1.536MBps of bandwidth (this has become common in modern networks)
The
T1 was frequently thought of as the basic building block in Telecommunications networks - however with the acceptance of asynchronous and IP based data transmission that concept has lost favour.