USRobotics Introduces 33.6 Kbps

Welcome to the next level of high speed analog data communications - 
33.6 Kbps.  Your Courier modem contains new enhanced V.34 software 
that provides the capability for two new connection rates:  31.2 Kbps and 
33.6 Kbps.  The new software also improves general throughput as a 
result of advanced design, larger block sizes, and the implementation of 
selective reject.  

Higher Connection Rates

While line conditions may not always allow for 33.6 connections, the 
new software enhances overall performance and reliability, making it 
more likely to achieve and maintain 28.8 connections.  It can even add up 
to 4800 bps to your average V.34 connection rate.  

Selective Reject

Selective reject is part of the improved software for the "V.Everything" 
modem.  You may notice significant throughput improvements over 
noisy lines when connecting with other modems using this feature, as the 
number of retransmitted blocks is reduced.  

Upgrades

31.2 and 33.6 Kbps connection rates are only possible when connecting 
with other "V.Everything" modems upgraded to the latest software 
revision.  Be sure that friends and business associates using U.S. Robotics 
Courier modems upgrade to the new V.34 software, so that they too can 
take advantage of the higher connection rates and improved throughput 
capabilities.  Upgrades are free to anyone who owns a U.S. Robotics 
"V.Everything" modem.  Simply download the new software from our 
free BBS service.  Complete instructions for performing software upgrades 
are included in the Courier manual.  

New Parameters

Result Codes

The following new verbal connect messages and numeric result codes are 
included.  

       Verbal            Numeric
---------------------    -------
CONNECT 31200              151
CONNECT 31200/ARQ          152
CONNECT 31200/V34          153
CONNECT 31200/ARQ/V34      154
CONNECT 33600              155
CONNECT 33600/ARQ          156
CONNECT 33600/V34          157
CONNECT 33600/ARQ/V34      158

New Inquiry Displays

The ATI6 diagnostic screen has an extended protocol field which 
displays the actual block and window sizes, and indicates when selective 
reject has been negotiated.  The I11 screen displays "V34+" for 
connections with other U.S. Robotics modems using the new V.34 
software.

Fixed Connection Rate

The &N command for fixing connection rates has been extended to 
support the two new speeds, adding &N15 (31.2 Kbps) and &N16 (33.6 
Kbps).  

Feature Disable

31.2 and 33.6 Kbps may be disabled by issuing the following AT 
command:  

AT S56.5=1

Selective reject can be disabled by issuing the following command:  

AT S51.6=1

Disabling of these features is only necessary for certain troubleshooting 
purposes.  

Synchronous

Fixed synchronous mode can also operate at 31.2 and 33.6 Kbps under 
V.34 with the new software upgrade.  The maximum synchronous rate 
under V.25bis is 19.2 Kbps.  

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