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2
Make a test data call.
Call the U.S. Robotics BBS. Type the following:
Or, in the 847 area code:
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
0
1
2
7-8
ATDT18477348612 <Enter>
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.
DNs
Bus Configuration
1
Point-to-Point
1
Multipoint
2
Multipoint
Courier I-modem Getting Started Guide
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