The tty_test utility contains a test server, a test client, and a small terminal application. The test client calls the test server. When the connection is established, the client starts to generate test frames and to transmit these frames to the test server. The test server loops the received data back to the transmitter (client). The test client verifies the received frames based on sequence number and check sum, and generates link statistics. The tty_test utility is located in the /usr/lib/eicon/divas directory.