When installing the Network Interface Unit (NIU), what tool is suggested?

The recommended tool for installing the Network Interface Unit (NIU) is a dial-pulse telephone test set for checking dial tone. This choice is relevant because the NIU serves as the demarcation point between the telecommunications provider's network and the customer’s premises. When installing an NIU, it is crucial to confirm that the line is active and functional, which is best accomplished by verifies that there is a dial tone present.

A dial-pulse telephone test set is specifically designed for this purpose, allowing installers to ensure that the necessary connections and services are functioning correctly before completing the installation. This step is vital to guarantee that the customer will have access to the intended services without any disruptions.

While other tools mentioned have their respective uses, they do not directly assist in confirming the operational status of the telephone line during an NIU installation. A digital multimeter would be more suited for electrical measurements rather than checking for dial tone, a cable stripper is used for preparing and terminating cables rather than verifying connectivity, and a probe for checking signal strength is more relevant in evaluating the quality of the signal rather than confirming the operational integrity of the NIU installation itself.