The intent is to provide secure communications between two computers. Some systems use a cryptography key to encipher transmitted bit patterns and decipher received bit patterns. To work properly, the communications software on both ends of link must use matching enciphering and deciphering techniques. Privacy Encrypted Mail . Some dial up HOST and BBS systems can even send Internet email messages.
Gateways allow their users to send and receive messages from email systems by other vendors.
You can request a higher cost data grade line from most phone companies. This allows the communications package to act as an answering machine and automatically answers the incoming call and to receive the imcoming data. Any computer user should use a surge suppressor . This ensures network operations and file integrity under various failure conditions. UPSs can be connected to a file server serial port for automatic shutdown service.