USRobotics V.34 user manual Universal Connect

COURIER HIGH SPEED MODEMS

Universal Connect

Courier high speed modems automatically detect and connect at the fastest available speed.

Adaptive Speed Leveling (ASL)

Like most high speed modems, Courier modems fall back to the next lower speed—for example, 19.2K, then 16.8K in V.terbo mode—if poor line conditions warrant. In addition, Courier V.32 bis, and V.32 terbo modems detect improved line conditions and shift upward again to the next higher speed. both transmit and receive channels adapt independently, each detecting and adjusting to line conditions. ASL keeps the modems online, always operating at the highest possible speed, and constantly ensuring data integrity.

Fax Capability

You can use your modem with Class 1 or Class 2.0 facsimile software to exchange faxes with millions of Group III fax machines worldwide. See Chapter 5.

Error Control⎯V.42/MNP

Data integrity is ensured when the modems connect with remote modems that use the V.42 (LAPM), HST, or MNP error control protocols. Error control is available on calls at 1200 bps and above.

Data Compression⎯V.42 bis/MNP5

Data compression enables potential throughput of up to 115.2K bps on 28.8K bps connections. Couriers connecting under V.42 or HST error control use V.42 bis compression. Couriers connecting under MNP error control use MNP Level 5 compression. Typical throughput of text and other types of files using V.42 bis is provided in Appendix A.

1-2 Features and Compatibility