The NSS-368A Network Cable Tester is a practical, handheld diagnostic tool designed for professionals and DIYers to verify the integrity and wiring configuration of network and telephone cables.

It is a two-piece system consisting of a Master unit and a Remote terminator, allowing you to test cables that are already installed through walls or across large distances.

Core Specifications & Capabilities

Supported Cable Types: * RJ45: Ethernet cables (Cat5, Cat5e, Cat6, Cat6a, Cat7).
- RJ11/RJ12: Telephone and DSL cables.
Testing Modes: * Auto-Scan: Automatically cycles through the wires at a standard speed.
- Slow-Scan (S): Cycles through at a slower pace to allow for easier visual inspection of each pin.
Detection Features: Identifies short circuits, open circuits, crossed pairs, and miswiring.

Key Components

Main (Master) Unit: Features the power switch (Off/On/S) and a set of 8-9 LED indicators.
Remote Unit: A passive unit that mirrors the signals sent from the Master unit.
G-LED (Ground): Specifically used for testing shielded (STP) cables to ensure the grounding wire is intact.

How to Interpret Results

When the tester is active, the LEDs on both units should light up in sequential order (1 through 8) for a standard straight-through Ethernet cable.

Result	Observation
Normal (Straight)	Both units flash 1-2-3-4-5-6-7-8 in perfect synchronization.
Short Circuit	Multiple LEDs light up at the same time, or one LED appears significantly dimmer.
Open Circuit	One or more LEDs fail to light up on either the Master or Remote unit.
Crossed Cable	The sequence on the Remote unit is out of order (e.g., 1-2-6-4-5-3-7-8).

Usage Tips

Don't Test Live Circuits: Never connect this tester to an active network switch or PoE (Power over Ethernet) port, as the voltage can damage the internal circuitry of the tester.
Battery Check: If the LEDs appear very faint or cycle erratically, it is usually a sign that the 9V battery needs replacement.
Patch Lead Testing: You can slide the Remote unit onto the side of the Master unit to test short patch cables easily at your desk.