Cisco AS5350XM Configuration Manual page 96

Testing Asynchronous Shell Connections
Basic modem links
•
Basic IP functionality to support shell sessions
•
The Cisco IOS software provides a command-line interface (CLI) called the EXEC that can be accessed
by dialing in with a modem. The EXEC 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
•
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 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:
Locate a client PC, client modem, and analog line. From the client PC, open a terminal emulation
Step 1
program (such as HyperTerminal, not dial-up networking) and connect to the client modem.
shows the network environment for this test.
Figure 4
Client PC
From a terminal emulation program, test your EIA/TIA-232 connection to the client modem. Enter the
Step 2
at command. The modem returns the prompt OK.
at
OK
Note
Dial the PRI telephone number assigned to the gateway (in this example, the number is 5554100). After
Step 3
the modem successfully connects, a connect message appears.
atdt 5554100
CONNECT 33600/REL - LAPM
Cisco AS5350XM and Cisco AS5400XM Universal Gateways Software Configuration Guide
36
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
Basic Configuration Using the Command-Line Interface
PRI lines
PSTN
Cisco gateway
with integrated
modems
Figure 4
Default
gateway
V
V