You can define the protocol to use with each device in /etc/uucp/Devices. This specification is usually unnecessary because you can use the default or define the protocol with the particular system you are calling. Refer to UUCP /etc/uucp/Systems File for details. If you do specify the protocol, you must use the following form:
Type,Protocol [parameters]
For example, you can use TCP,te to specify the TCP/IP protocol.
The following table shows the available protocols for the Devices file.
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Here is an example that shows a protocol designation for a device entry:
TCP,te - - Any TCP -
This example indicates that, for device TCP, you should try to use the t protocol. If the other end of the transmission refuses, use the e protocol.
Neither e nor t is appropriate for use over modems. Even if the modem assures error-free transmission, data can still be dropped between the modem and the CPU.