How to Test an RJ45 Cable After Crimping – RJ45 Cable Tester Guide Malaysia
How to Test an RJ45 Cable After Crimping – RJ45 Cable Tester Guide Malaysia
After crimping an RJ45 connector, test the cable before connecting it to network equipment. Check the wire mapping, look for open, short or crossed connections, and verify the termination quality.
A connector that looks correct externally can still have an internal termination problem.
For network installers and CCTV contractors, the Noyafa NF-8209 Pro provides RJ45 wire mapping and crimping quality testing, together with cable tracing, cable length measurement, PoE testing and Port Flash.
Why Test Every RJ45 Cable After Crimping?
RJ45 termination is a routine job, but small mistakes can cause significant troubleshooting later.
Possible problems include:
Incorrect wire sequence
Conductor not making proper contact
Open circuit
Short circuit
Crossed wiring
Poor crimping
Damaged connector
Damaged cable
Testing immediately after termination allows the installer to correct the problem before the network point is commissioned.
Step 1 – Visually Inspect the RJ45 Connector
Before using the tester, inspect the connector.
Check whether:
The cable is fully inserted
Conductors appear correctly positioned
The connector is properly crimped
The plug is not physically damaged
The cable jacket is properly secured
Visual inspection is useful, but it should not replace electrical testing.
A connector can look good and still fail.
Step 2 – Check RJ45 Wire Mapping
The next step is to verify the wiring.
The Noyafa NF-8209 Pro provides RJ45 wire mapping to help technicians check whether the cable conductors are connected correctly.
This can help identify common conditions such as:
Open
A conductor does not have a complete connection.
This may happen if a conductor fails to make proper contact with the RJ45 terminal.
Short
Conductors that should remain separate are electrically connected.
Crossed Wiring
The conductor arrangement does not match the expected connection.
These problems should be corrected before the cable is placed into service.
Step 3 – Check Crimping Quality
Correct wire sequence is important, but termination quality also matters.
The NF-8209 Pro includes an RJ45 crimping quality test.
This provides technicians with an additional way to inspect a newly terminated connector.
For contractors preparing many RJ45 cables on site, this can be a useful quality-control step.
Step 4 – Test Both Ends of the Installation
A permanent network cable normally has termination points at both ends.
Depending on the installation, this may involve:
Wall Outlet → Network Cable → Patch Panel
or:
IP Camera → Network Cable → PoE Switch
The complete cable path should be considered when troubleshooting rather than looking only at one RJ45 connector.
Step 5 – Identify the Cable If Necessary
After many cables have been installed, identifying which cable corresponds to a particular network point can become difficult.
The NF-8209 Pro supports:
Digital Cable Tracing
and
Analog Cable Tracing
These functions help technicians identify the target cable inside a bundle or network cabinet.
This is especially useful when cable labels are missing or incorrect.
Step 6 – Check the Cable Length
The NF-8209 Pro supports compatible CAT5/CAT6 cable length measurement from approximately 5 to 350 metres.
Cable length measurement can provide useful information for:
Installation documentation
Existing cable investigation
Network troubleshooting
Long cable runs
It adds another diagnostic capability beyond basic RJ45 testing.
Step 7 – Identify the Switch Port
For an installed Ethernet cable, technicians may also need to determine which network switch port is connected.
The Port Flash function helps identify the corresponding switch port through its indicator behaviour.
This is useful when commissioning or troubleshooting office, CCTV and structured cabling installations.
Step 8 – Check PoE When Required
If the newly terminated cable will be used for a PoE device, additional checking may be required.
Typical PoE devices include:
IP CCTV cameras
Wireless access points
VoIP phones
Security equipment
The NF-8209 Pro includes PoE testing, making it particularly useful for installers working with PoE-based networks.
Example: New IP Camera Cable
A CCTV installer runs a new CAT6 cable for an IP camera.
Before completing the installation, the technician can:
1. Crimp the RJ45 connectors
2. Check the wire mapping
3. Check the RJ45 termination
4. Confirm the cable identification
5. Identify the switch port
6. Investigate PoE when required
This is better than waiting until the camera fails to connect before checking the cabling.
Example: Office Network Installation
Consider a new office with 50 network points.
If every cable is installed first and testing is postponed until the end, locating one incorrectly terminated cable may take additional time.
A better workflow is:
Terminate → Test → Label → Document
Testing each connection as the installation progresses helps contractors identify problems earlier.
RJ45 Testing for Network Contractors
For network contractors, cable testing is also part of workmanship quality.
A completed network point should not be handed over based only on visual inspection.
Basic verification can help reduce:
Customer complaints
Return visits
Troubleshooting time
Unnecessary equipment replacement
The correct level of testing should depend on the project requirements.
Basic RJ45 Tester vs Multifunction Tester
If your work only involves occasional patch cable crimping, a basic RJ45 tester may be enough.
However, professional installers may also need to:
Trace the cable
Measure its length
Identify the switch port
Investigate PoE
This is where a multifunction network tester provides additional value.
Noyafa NF-8209 Pro for RJ45 Testing
The Noyafa NF-8209 Pro combines:
RJ45 Wire Mapping
RJ45 Crimping Quality Test
Open / Short / Crossed-Pair Checking
Digital Cable Tracing
Analog Cable Tracing
CAT5/CAT6 Cable Length Measurement
PoE Testing
Port Flash
NCV Detection
This makes it suitable for both cable installation and subsequent troubleshooting.
RJ45 Cable Tester Malaysia
If you regularly terminate CAT5e or CAT6 network cables, testing after crimping should be part of the installation process.
For technicians looking for an RJ45 Cable Tester in Malaysia with additional network troubleshooting functions, the Noyafa NF-8209 Pro is a practical multifunction option.
Contact MTM Precision
Looking for an RJ45 Cable Tester, CAT6 Tester, Cable Tracer or Network Cable Tester in Malaysia?
MTM Precision Sdn Bhd
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
Website: www.mtmpre.com.my
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Contact MTM Precision for the Noyafa NF-8209 Pro and professional network cable testing solutions in Malaysia.
29 Aug 2026
