Animated Telecom Dictionary
Use this dictionary for an understanding of the most recent telecom terms, definitions and acronyms, look at detailed animations, learn to search telecom databases, and more.
TABLE OF CONTENTS Animated Telecom Dictionary
V: V VU
V
See: volt
V.17
ITU recommendation for simplex modulation technique for use in extended Group 3 facsimile applications only. Provides 7,200, 9,600, 12,000, and 14,400bps trellis-coded modulation.
V.21
ITU recommendation for 300 bps duplex modems for use on the switched telephone network. V.21 modulation is used in a half-duplex mode for Group 3 fax negotiation and control procedures.
V.22
ITU recommendation for 1,200 bps duplex modems for use on the switched telephone network and leased lines.
V.22bis
ITU recommendation for 2,400 bps duplex modems for use on the switched telephone networks. V.22bis also provides for 1,200 bps operation for V.22 compatibility.
V.24
A CCITT standard with definitions for interchanged circuits between data terminal equipment (DTE) and data communications equipment.
V.25
The automatic calling or answering equipment on a switched telephone network that includes the disabling of echo suppression on manually established calls.
V.27ter
ITU recommendation for 2.4/4.8-kbps/s modem for use on the switched telephone network. Half-duplex only. It defines the modulation scheme for Group 3 facsimile for image transfer at 2,400 and 4,800 bps.
V.29
ITU recommendation for 9,600 bps modem for use on point-to-point leased circuits. This is the modulation technique used in Group 3 fax for image transfer at 7,200 and 9,600 bps. V.29 uses a carrier frequency of 1,700 Hz which is varied in both phase and amplitude. V.29 can be full duplex on four-wire leased circuits, or half duplex on two-wire and dial-up circuits.
V.32
ITU recommendation for 9,600 bps two-wire full duplex modem operating...
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