SDX Audio SPOT 14.4, User Manual

Page: 31 / 40

Modem Terminology Overview Modem Terminology Overview - Page - Page 31 31
SPOT 14.4 SPOT 14.4 User's Guide User's Guide 38GDE00001SCF - Issue 4 (11/96) 38GDE00001SCF - Issue 4 (11/96)
Standard Protocols Standard Protocols
Like the standard tones used by a modem, its transmission speed, parity
checking, and number of stop/start bits has to be known by the answering
computer for it to decode your data. All these details are defined by the
CCITT in a series of "V" specifications.
The following is a brief list of the various modem specifications supported
by SPOT.
– V17
V17:: See "Fax Modems" on page 33.
– V.21 V.21: : Full duplex transfer of data in both directions at the same time.
This mode handles any speed up to 300 bps including 75 and 100
bps.
– V.22 V.22: : This is a full duplex operating mode with data transferred in
both directions at 1200 bps.
– V.22bis V.22bis: : Full duplex operation mode with data transferred in both
directions at 2400 bps. When operating using V.22bis or higher, it is
recommended that error detection is used.
– V.23 V.23:: Operation with 600 or 1200 bps on from the originating DTE and
75 bps from the answering DCE.
– V.27ter V.27ter:: See "Fax Modems" on page 33.
– V.29 V.29:: See "Fax Modems" on page 33.
– V.32 V.32: : Full duplex operation mode with data transferred in both
directions at 9600bps.
– V.32bis V.32bis: : Full duplex operation mode with data transferred in both
directions at 14400bps.
– V.42 V.42:: Error correction using MNP4 for V22, V.22bis, V.32 and
V.32bis.
– V.42bis V.42bis: : See "Data Compression" on page 30.