Below is a basic schematic for testing your modem at the INI (Indoor Network Interface). For detailed instructions please reference the INI Test FAQ. NOTE: If you live in a standard residential home please reference the NID Test FAQ and NID Test Schematic .

*Some modems (STH Test and Cayman Test) have the ability to test attainable line rate, relative bandwidth capacity, power, attenuation, and signal-to-noise ratio. If available, these measurements are the most accurate assessment of line quality.


Schematic by Andy Houtz
Andy Houtz DSL