Esi-2000 Installation Manual !!top!!

Run the static pressure line to the static port. Ensure all connections use leak-free flare or compression fittings. Electrical Connections

Reversing Tip and Ring. The manual shows that ESI digital phones are polarity-insensitive for voice but require correct data pair orientation for the LCD display. esi-2000 installation manual

– ESI (Enterprise Systems Interface or similar) isn't a widely known standard model. That suggests either a fictional device, an obscure industrial controller, or an inside joke about obsolete telecom/server gear. Run the static pressure line to the static port