Final answer:
The tools that can be used to see if a line has bridge taps are TDR, OTDR, and Multimeter.
Therefore, the correct answer is a) TDR (Time Domain Reflectometer), b) OTDR (Optical Time Domain Reflectometer), and c) Multimeter.
Step-by-step explanation:
Bridge Tap is a common problem that occurs when multiple telephone lines are connected to a single NBN line.
These additional lines act like bridges, creating interference and causing signal disruptions that will result in lower achievable speeds and sync dropouts.
The tools that can be used to see if a line has bridge taps are:
TDR (Time Domain Reflectometer): This tool sends a signal down the line and measures how long it takes for the signal to be reflected back. If there are any interruptions or changes in the impedance of the line, they will be reflected back and can be detected by the TDR.
OTDR (Optical Time Domain Reflectometer): Similar to TDR, OTDR is used for fiber optic lines. It sends a pulse of light down the fiber and measures the reflections. If there are bridge taps or any other issues with the fiber, they will be reflected back and can be analyzed by the OTDR.
Multimeter: A multimeter can be used to measure the resistance, capacitance, or impedance of the line. If there are bridge taps, they can cause changes in these measurements, indicating their presence.