COURIER HIGH SPEED MODEMS
Flow Control/Variable Serial Port Rates
Flow control, required under error control, also allows the local serial port (DTE) rate to be set higher than the link (connection) rate, enabling greater efficiency and throughput. If your equipment and software support high rates, data can be sent from the computer to the modem at 115.2K, 57.6K, 38.4K or 19.2K bps, regardless of the link rate.
Voice/Data Switch
A switch on the modem's front panel allows you to change from voice to data and back again, without issuing a command. See Appendix G.
Stored Command String
If you don't ordinarily use voice and data in the same call, you can assign the voice/data switch a different function that normally requires a command, such as resetting the modem or executing a stored command string. See Voice/Data in Appendix G for instructions on use of the voice/data switch.
Asynchronous/Synchronous Capability
Courier high speed modems operate synchronously as well as asynchronously. A personal computer equipped with a synchronous interface adapter can call computers that use standard synchronous protocols. See Appendix F for more information.
Synchronous Operations with V.25 bis
Used with computers that have a synchronous card and port, Courier high speed modems combine the power of older modems and automatic calling units in the mainframe environment. They make synchronous connections by utilizing V.25 bis,
Dial Security
With Dial Security, you will be able to prevent unauthorized access to a system with the use of Autopass, Prompting, and Dialback. See Appendix D for more information.
Features and Compatibility
