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A-2 Courier I-modem Getting Started Guide

Period Dial Modifier

The period (‘.’) dial modifier is used to send DTMF tones after the

telephone number is dialed. The period dial modifier can be used with

the comma (',') dial modifier to insert delay between the numbers as

appropriate for the application. A typical application for the period dial

modifier is use with PBX systems.

Example: ATDT18479335200.980234

In this example, 18479335200 will be dialed using ISDN signaling, then

980234 will be dialed using in band DTMF signaling.

PCSDL vs. XMODEM

In certain situations, such as running under a multitasking OS such as

Microsoft Windows 95, you may experience difficulty performing a

software download using PCSDL. As a result, U.S. Robotics recommends

using PCSDL under DOS only or performing software download using

the XMODEM file transfer protocol as described in the Courier I-modem

Command Reference in section 17-2.

230 kbps DTE Rate Under Windows®

If you are using a Windows® 95 terminal program, you will be unable to

set your transmission speed to 230 kbps.

230 kbps in Internal I-modems

The I-modem operates at 230 kbps when appropriate regardless of the

transmission speed setting.

Note: Windows does not display the actual data rate for internal

I-modems.

230 kbps in External I-modems

To take advantage of the 230 kbps data rate, you may need to purchase a

high speed (230 kbps) serial card.

Note: Depending on the serial card you purchase, the actual data rate

may not appear correctly in Windows. Consult the serial card

documentation if this problem occurs.

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Robotics COURIER Informações Técnicas Página 122