0049-1800-xxx 326X V.34, V.34-SDC and V.32bis Series Modem – USER’S GUIDE 02/23/2010
Rev. A
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advantage of faster transmission speeds while providing highly reliable data transmission in full-duplex
synchronous environments.
326X
FAST
modems have a line probing feature that optimizes performance on every connection by
automatically choosing the optimum bandwidth, carrier frequency, and data rate.
V.34 Modulation Mode Characteristics
V.34 modulation mode characteristics are as follows:
Data Rate
: 2.4, 4.8, 7.2, 9.6, 12.0, 14.4, 16.8, 19.2, 21.6, 24.0, 26.4, 28.8, 31.2, and 33.6 kbps
Baud Rate
: 2400, 2743, 3000, 3200, and 3429. Some baud rates do not support all data rates.
Carrier Frequency:
1600, 1646, 1800, 1829, 1920, 1959, and 2000 Hz. Some baud rates do not
support all carrier frequencies.
Modulation
: V.34 is a four-dimensional trellis-coded modulation standard that uses precoding and
pre-emphasis equalization schemes.
Compatibility in V.34 Modulation Mode
326X
FAST
Series Modems (operating in V.34 Auto modulation mode), are compatible with
modems that do not support the V.34 modulation mode, by automatically negotiating the highest
common modulation mode (e.g., V.32bis).
V.90 Compatibility
: Release 8.1 software enables 326X modems to operate with V.90 modems in
dial-up connections. With this software, 326X modems can communicate with V.90 modems and
negotiate V.34 rates. The release does not provide 56 kbps rates for 326X modems, nor 326X rates
higher than the V.34 33.6 kbps standard. An upgrade to 8.1 is not required for modems used only in
leased-line
applications.
SYNCHRONOUS DATA COMPRESSION (SDC) FEATURE
The 326X
FAST
Series Modem is available in a
synchronous data compression (SDC)
model. 326X
FAST
products offer all the features of the 326X
FAST
family, plus synchronous DTE rates at 72.0 kpbs or higher.
The 326XFAST-SDC Modem is an ideal alternative to costly digital services. Whether your application
requires dedicated bandwidth, bandwidth on demand, synchronous dial-up, or dial backup, the 326X-SDC
provides optimum throughput for all HDLC/SDLC-like environments, such as X.25, Systems Networking
Architecture (SNA), Statistical Multiplexer, and Router networks.
