LVTTS 1.5

The Lab-Volt Telephony Training System (TTS), Model 8086, is a powerful learning tool that provides training on modern telephone networks and digital private automatic branch exchanges (PABX).
It is also an essential tool to introduce students to the Integrated Services Digital Network (ISDN). The TTS is built upon state-of-the-art, programmable equipment that operates real world devices, including telephone sets and trunk lines.