Testing Asynchronous Shell Connections - Cisco AS5350 - Universal Access Server Configuration Manual

Chapter 3 Basic Configuration Using the Command-Line Interface

Testing Asynchronous Shell Connections

This task verifies that the following components are working:
•
•
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The Cisco IOS software provides a command-line interface (CLI) called the EXEC. The EXEC:
•
•
During this task, some administrators try to make complex services function, such as PPP-based Web
browsing. Do not jump ahead. Many other elements still must be configured (for example, PPP and
IPCP). The asynchronous-shell test ensures that the EXEC's login prompt can be accessed by a client
modem. Taking a layered approach to building a network isolates problems and saves you time.
To test asynchronous-shell connections, perform the following steps:
Step 1 Locate a client PC, client modem, and analog line. From the client PC, open a terminal emulation
program (such as Hyper Terminal, not Dial-Up Networking) and connect to the client modem.
shows the network environment for this test.
Figure 3-2
Client PC
Step 2 From a terminal-emulation program, test your EIA/TIA-232 connection to the client modem. Enter the
at command. The modem returns the prompt OK.
at
OK
Note
OL-3418-02 B0
The physical asynchronous data path
Basic modem links
Basic IP functionality to support shell sessions
Can be accessed by dialing in with a modem
Provides access to terminal-shell services (no PPP) to do the following:
– Modify configuration files
Change passwords
–
Troubleshoot possible problems including modem connections
–
Access other network resources by using Telnet
–
Test Environment
POTS line
Client
modem
To learn more about the at command set, see the various references available online at the
Technical Assistance Center website at
http://www.cisco.com/pcgi-bin/Support/PSP/psp_view.pl?p=Internetworking:ASYNC&s=Impl
ementation_and_Configuration
Cisco AS5350 and Cisco AS5400 Universal Gateway Software Configuration Guide
Testing Asynchronous Shell Connections
PRI lines
PSTN
Cisco gateway
with integrated
modems
Figure 3-2
Default
gateway
V
V
3-37