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Ring Detection
Most modems produce an interrupt request each time they detect a ring signal. Some modems generate an interrupt only on the first ring signal that they receive. AT&T Data Port 2001 is an example of such a modem.
The service processor uses the ring interrupt request to count the number of rings when Ring Indicate
Terminal Emulators
The service processor is compatible with simple ASCII terminals, and therefore compatible with most emulators. When a remote session is handed off from the service processor to the operating system, agreement between terminal emulators becomes important.
The server's operating system will have some
For best formatting, choose line wrap in your terminal emulator setup.
Recovery Procedures
Situations such as line noises and power surges can sometimes cause your modem to enter an undefined state. When it is being used for
If your modem communicates correctly with remote users, it is probably in control. It may be wise to occasionally change some of the functional settings and then change them back, just for the sense of security that the modem is communicating, and to ensure it has been initialized recently.
If your system is particularly difficult to access physically, another strategy is to protect it with an Uninterruptable Power Source (UPS) and a
In case recovery becomes necessary, shut down your system as gracefully as possible. Disconnect the power cable and press the power button to drain capacitance while power is disconnected. Disconnect and reconnect modem power, then reconnect system power to completely reinitialize your system.
Transfer of a Modem Session
Because many modem command variations exist, the sample modem configuration files located at the end of this appendix have been written to capture the largest number of workable modem settings.
Appendix E. Modem Configurations 175