0049-1800-xxx 326X V.34, V.34-SDC and V.32bis Series Modem – USER’S GUIDE 02/23/2010
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CQMS parameters continuously estimate major line parameters without disrupting data traffic. Measurement of
such selections as signal-to-noise ratio and receive level helps you to isolate causes of degraded network
performance.
ADAPTIVE RATE SYSTEM
With the Adaptive Rate System enabled, the 326X Series Modem continuously optimizes its transmit speed
within the V.34, V.32bis, V.32 (coded and uncoded), and V.22bis modulation modes. By constantly monitoring
signal quality, the modem adapts to the optimum transmission rate allowed by line conditions, ensuring
maximum throughput and efficiency.
TROUBLESHOOTING (V.54 AND V.22bis TESTS)
The modem supports a full range of ITU-TS V.54 and V.22bis compatible tests to help isolate and correct
problems.
Refer to Chapter 6 for typical problems and ways to correct them. Chapter 6 also lists the supported diagnostic
tests, and instructions for initiating and terminating tests using either the front panel control keys or AT
commands.
For details on tests, refer to Chapter 4 of the 326X
Series Modem Reference Guide
.
COUNTRY-SPECIFIC INFORMATION
Telephone company regulations vary by country. Because of this, there are minor physical or operational
differences among 326X Series Modem models.
Appendix C, Country-Specific Information, provides cabling, rear panel layouts, interface pinouts, and other
modem features that are required or restricted by country regulatory agencies.
NET COMPLIANCE
This release of the 326X Series Modem complies with the European Telecommunication Standards Institute’s
(ETSI) Net 20, 21, 22, 23, and 25.
