US Robotics COURIER - CHAPTER 1. FEATURES AND COMPATIBILITY; Modem Introduction; Adaptive Speed Leveling (ASL); Error Control Protocols (V.42;MNP)

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COURIER HIGH SPEED MODEMS
CHAPTER
1. FEATURES AND COMPATIBILITY
INTRODUCTION
Congratulations! The Courier modem you've purchased repre-
sents powerful, advanced electronic design that offers excep-
tional reliability,
compatibility and flexibility at all standard
rates up to 14,400 bits per second (bps). Courier HST modems
connect with each other at up to 16,800 bps. The transmission
rate between the computer and modem, depending on your
equipment and software support, can be as high as 57,600 bps.
The following features
and capabilities assure you of superior
reliability and performance.
High Speed Calls-Adaptive Speed Leveling (ASL)
All Courier high speed modems-HST, V.32 bis and Dual Stan-
dard-connect at 9600, 12K and 14.4K bps, with 16.SK the
maximum rate on HST-to-HST connections. In addition, our
high-speed modems monitor phone line quality and perform
Adaptive Speed Leveling.
Like
most high speed modems, Courier modems fall back to the
next lower speed, for example, 12K, then 9600, if poor line
conditions warrant. Unlike other modems, however, that stay at
the lower rate for the rest of the call, Courier modems detect
improved line conditions and shift upward again to the next
higher speed. ASL keeps the modems online, always operating
at the highest possible speed, and constantly ensuring data
integrity.
Fax Capability-Courier Fax Modems
If you've chosen to purchase a Courier modem with fax capabil-
ities,
you can use your modem in Class 1 facsimile mode for
sending or receiving faxes.
Error Control-V.42/MNP
Data integrity is ensured when the modems connect with remote
modems that use the V.42 (LAPM), USR-HST, or MNP error
control protocols. Error control is available on calls at 1200 bps
and above.
Features and Compatibility 1-1