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7-8 Courier I-modem Getting Started Guide

2 Make a test data call.

Call the U.S. Robotics BBS. Type the following:

ATDT18477348612 <Enter>

Or, in the 847 area code:

ATDT7348612 <Enter>

Note: When you make ISDN calls, you won’t hear dialing or

training tones when the call is being made. This is normal.

You should see one of the following messages:

CONNECT 56000/ARQ/DIGITAL/V120

CONNECT 64000/ARQ/DIGITAL/V120

Note: If you don’t see one of these codes, refer to Chapter 15,

Troubleshooting, in the I-modem Command Reference.

Special Considerations for AT&T 5ESS Custom

If your central-office switch is an AT&T 5ESS that runs the Custom

protocol, you can use fewer than two SPIDs/DNs, although this is not

recommended. Lines with fewer than two SPIDs/DNs prevent your

making two analog-based calls at one time.

For example, with fewer than two SPIDs/DNs, you can make a digital call

(such as V.120 or synchronous PPP) and a voice call at the same time, but

not a fax/modem and a voice call simultaneously.

SPIDs DNs Bus Configuration

0 1 Point-to-Point

1 1 Multipoint

2 2 Multipoint

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 150 151

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Robotics COURIER Technical Information Seite 64