20CHAPTER 1: INTRODUCTION

Modulation Schemes

V.90 (backwards-compatible with all US Robotics 56K Standards)

ITU-T V.34+

ITU-T V.34

ITU-T V.32bis

ITU-T V.32

ITU-T V.22bis

ITU-T V.22

ITU-T V.23

Bell 212A

ITU-T V.21

Bell 103

Security

PAP, CHAP and MS-CHAP support

Callback support for dial-in and dial-out calls

Upgradeability

Flash memory for field firmware updates

Firmware posted on 3Com’s Web site

Fully upgradeable to future 56K standards

Diagnostics

LED status display

Statistics display

Warranty

3Com Corporation Limited Lifetime Warranty (refer to the end of this User Guide for details).

Support for Internet Applications

Support for applications that use the User Datagram Protocol (UDP) and the Transmission Control Protocol (TCP). The UDP protocol is used primarily by Internet games.

Look for the latest list of Internet applications and games that are interoperable with the LAN Modem at

http://www.3com.com/support/docs/lanmodem/.

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3Com Dual 56K manual Modulation Schemes, Security, Upgradeability, Diagnostics, Warranty, Support for Internet Applications