How to Find an Unknown Network Cable in a Server Rack Using FNIRSI LPM-10A Malaysia
How to Find an Unknown Network Cable in a Server Rack Using FNIRSI LPM-10A Malaysia
A common network maintenance problem is surprisingly simple:
You know the network outlet, but you do not know which cable it is inside the server rack.
This happens frequently in older offices, shops, factories and commercial buildings where network cables were installed over many years.
Labels may be missing.
Some labels may be incorrect.
Previous contractors may have changed connections.
The network cabinet may contain dozens of similar Ethernet cables.
Instead of disconnecting cables one by one, a network cable tracer such as the FNIRSI LPM-10A can help technicians identify the required cable more efficiently.
Typical Situation
Imagine an office user reports:
“This network point has no connection.”
You inspect the wall outlet and identify the RJ45 point.
But when you enter the communication room, you find:
24 or 48-port switches
Patch panels
Multiple Ethernet cables
Old cables without labels
Unused cables mixed with active cables
Now the first problem is not repairing the network.
The first problem is:
Which cable belongs to that outlet?
This is where cable tracing becomes useful.
Step 1: Identify the Network Point
Start from the network outlet or cable that you want to identify.
Before tracing, inspect the connector and cable condition.
Look for obvious problems such as:
Damaged RJ45 connectors
Loose wall sockets
Broken locking tabs
Crushed cables
Poorly terminated connectors
If the physical condition already looks abnormal, record it before continuing.
Step 2: Connect the FNIRSI LPM-10A
Connect the appropriate part of the FNIRSI LPM-10A system to the cable you want to trace.
The tester can then be used to generate a tracing signal through the cable.
At the other end of the installation, use the receiving function to search for the corresponding cable.
This is particularly useful when several visually identical network cables are grouped together.
Step 3: Trace the Cable at the Network Cabinet
Move to the network cabinet, patch panel or cable bundle.
Use the receiver to check the suspected cables.
As you move closer to the cable carrying the tracing signal, the receiver helps you narrow down the correct cable.
Do not immediately assume that the first detected cable is correct.
When cables are bundled closely together, signals may be detected from neighbouring cables.
Compare several nearby cables and identify the strongest and most consistent response.
Step 4: Separate the Suspected Cable
Once you have narrowed the search to a small group, separate the suspected cable from adjacent cables where practical.
Test it again.
This helps reduce confusion caused by cables running closely together.
In a densely packed server rack, careful confirmation is much better than simply choosing the first cable that produces a response.
Step 5: Confirm the Cable
After identifying the likely cable, confirm that you have found the correct connection.
Depending on the installation, this may involve:
Wire-map testing
Continuity checking
Cable length checking
Switch port identification
Network connection testing
The important principle is:
Tracing identifies the likely cable. Testing confirms the connection.
Using both methods reduces the chance of working on the wrong cable.
What If the Cable Is Connected to a Switch?
Sometimes the objective is not to find a loose cable.
Instead, you need to identify:
Which switch port is connected to this network outlet?
This is another common problem in offices and server rooms.
The FNIRSI LPM-10A port flashing function can help technicians identify the associated switch port.
This can be particularly useful when dealing with switches containing many active connections.
Rather than unplugging cables randomly, technicians can use the tester to narrow down the correct port.
Why Cable Labels Are Not Always Reliable
Technicians should not rely entirely on existing cable labels.
For example, a wall outlet may be labelled:
A-12
and the patch panel may also have an A-12 label.
But during previous maintenance work, someone may have moved the connection without updating the documentation.
This is why physical testing is important.
A label is information. A test is verification.
For troubleshooting an unfamiliar network installation, verification is safer.
Cable Tracing for CCTV Installations
The same method is useful for IP CCTV systems.
A building may have many IP cameras connected through PoE switches.
If one camera stops working, the technician may need to determine:
Which Ethernet cable belongs to Camera 08?
Which PoE switch port is supplying it?
Is the cable wired correctly?
Is PoE available?
A multifunction network tester becomes much more useful here than a basic continuity tester.
The LPM-10A can support several stages of this troubleshooting process.
Cable Tracing in Offices
Office renovations frequently create network cabling problems.
Staff move desks.
Partitions change.
New network outlets are installed.
Old outlets remain.
Patch-panel documentation becomes outdated.
Eventually, the network cabinet may contain cables that nobody can identify confidently.
A cable tracer allows the technician to start from the actual outlet and work backwards toward the cabinet.
This is much faster than guessing based only on old labels.
Cable Tracing in Factories
Factory environments can be even more challenging.
Network cabling may run through:
Cable trays
Control rooms
Production areas
Machine areas
Communication cabinets
Office sections
CCTV systems
There may also be more electrical interference than in a normal office environment.
The LPM-10A includes cable tracing functions intended to assist with cable identification, including tracing modes for different working conditions.
Technicians should select the appropriate mode according to the installation environment.
Don't Pull Cables Randomly
One common troubleshooting mistake is disconnecting cables until the correct device stops communicating.
That method can create additional problems.
You could accidentally disconnect:
Another employee's workstation
A Wi-Fi access point
An IP camera
A VoIP telephone
A network printer
Access-control equipment
Another critical network device
In an active commercial network, unnecessary disconnection should be avoided.
Proper tracing and identification are safer approaches.
After Finding the Cable, Test It
Finding the correct cable is only the first step.
If the original complaint was:
“This network point is not working.”
you still need to determine why.
Possible causes include:
Incorrect termination
Open conductor
Cable damage
Connector problem
PoE problem
Switch configuration
Network equipment problem
Poor physical connection
This is where the additional testing functions of the FNIRSI LPM-10A become useful.
Instead of carrying a tool that only traces cables, technicians can continue with further network checks.
Why a Multifunction Network Tester Saves Time
Network troubleshooting often follows a sequence:
Find the cable → identify the port → test the cable → check PoE → investigate the network connection.
If separate instruments are required for every step, troubleshooting becomes slower.
A multifunction tester such as the FNIRSI LPM-10A is designed to combine several commonly required functions into one portable tool.
For field technicians, the biggest advantage may therefore not be any single function.
It is the ability to perform multiple troubleshooting steps with one instrument.
FNIRSI LPM-10A Network Cable Tester Malaysia
The FNIRSI LPM-10A is suitable for technicians working with network cabling, CCTV, PoE systems, server racks and structured cabling in Malaysia.
It can be particularly useful when dealing with existing installations where cables are poorly labelled or documentation is incomplete.
For FNIRSI LPM-10A availability or network tester enquiries, contact MTM Precision Sdn Bhd.
MTM Precision Sdn Bhd
Showroom & Service Centre:
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my
Not sure which network tester is suitable?
WhatsApp us a photo of your network cabinet, patch panel, RJ45 outlet or CCTV installation and explain the problem you are trying to troubleshoot.
Supply and enquiries throughout Malaysia, including Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak.
06 Oct 2026
