subvoice-grade channel

subvoice-grade channel

[¦səb′vȯis ‚grād ‚chan·əl]
(communications)
A channel whose bandwidth is smaller than the bandwidth of a voice-grade channel; it is usually a subchannel of a voice-grade line.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.