The Interface Unit TU11 combines three main functions in a compact battery powered unit.

• Interfacing test instruments to 2-wire and 4-wire lines
• Enabling telephone communications including dialling
• Providing Pulse and DTMF dial testing

Results are displayed on a 32 character, 2-line LCD.

Extensive software enables a clear indication of measurement conditions. Dial testing parameters are compared with programmed test limits.