Fiberplex TDU-4000-R Telephone Disconnect Unit

The Fiberplex TDU - 4000 - R Telephone Disconnect Unit is a top - notch solution for safeguarding your phones. It prevents phones from being misused as secret listening devices. When the phone is on - hook, this unit electrically cuts off the telephone line from the phone. The line is left open, and the phone's voice path is grounded, stopping room audio from being sent over the line and preventing eavesdropping. The phone only connects to the line when off - hook. The 'Off Hook' and 'Ring' detect signals are opto - isolated from the phone. A common setup has one TDU - 4000 connected to the POTS line and the subscriber's phone. For high - security needs, FiberPlex recommends the 'R' units as they have extra shielding and filtering to suppress RFI. Key features include no signal propagation to the Central Office or PBX when the phone is on - hook, compatibility with standard phones, STU - III phones, fax machines, and modems, and RFI suppression. Technical specs: Power requires a voltage range of 7V - 12V (typical 9V) and a supply current of 525mA. Audio has an input level of 5 dBm, a load impedance of 600 Ohms, and a frequency response of 200 - 8k Hz. It can be stored at - 40 - 85 °C and operated at 0 - 70 °C. The interface connector is RJ - 11.

Using the Fiberplex TDU - 4000 - R is easy. First, connect it between the POTS line and your phone using the RJ - 11 connector. Once connected, the unit will automatically work to protect your phone. When the phone is on - hook, it disconnects the line to prevent eavesdropping. Just pick up the phone when you want to make a call, and it will connect to the line. Note that the unit requires a power supply with a voltage between 7V and 12V, so make sure your power source meets this requirement. Also, avoid using it in environments with temperatures outside the operating range of 0 - 70 °C. For storage, keep it in a place where the temperature is between - 40 - 85 °C. To maintain the unit, keep it clean and free from dust. Check the connections regularly to ensure they are secure. If you notice any issues, such as a loss of connection or abnormal power consumption, consult the technical specifications or contact customer support.