Multitech MTA128ST-USB Podręcznik Użytkownika Pobierz pdf (Strona 56)

MultiMobile

USB

User Guide

Appendix B - V.90 Support

Introduction

V.90 is the ITU designation for what had formerly been called V.pcm. The ITU recommendation V.90

was determined at a meeting in Geneva ending February 6, 1998.

V.90 will replace K56flex and other proprietary solutions for PCM connections. Dual-mode client

modem code will be important until all central-site digital modems are upgraded to V.90 and all

interoperability problems have been resolved. Until that time, the Dual-mode client code will provide

reliable connections in K56flex mode to the central-site modems currently deployed.

Your V.90 dual-mode (V.90/K56flex) modem now includes:

· New AT commands,

· New Result Codes in V.90 mode, and

· A-law/μ-law selection and various changes to the AT command documentation.

V.90 Troubleshooting

1. Check if the modem firmware is the latest. If not, download the latest from

www.multitech.com

2. Try adding one or more comma (,) characters to the dialed number in the dialing string.

3. Try limiting the speed with the S37 (sets the maximum upstream speed) and S38 (sets the

maximum “downstream speed) commands.

4. Perform basic modem/line troubleshooting (check the phone line for noise, try a different line, try

another device on the same line, etc.

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Multitech MTA128ST-USB Podręcznik Użytkownika Strona 56