RJ45 connectors are among the most commonly encountered components in computer networking. They are used to terminate copper Ethernet cables connecting computers, switches, routers, access points, IP cameras, VoIP phones, network printers, servers and numerous other network devices.

Although people commonly call the Ethernet plug an RJ45 connector, the modular connector normally used for Ethernet cabling is technically an 8P8C (8 Position, 8 Contact) modular plug. The term "RJ45" has nevertheless become the standard industry and everyday name for it.

Two connector designs are commonly available to technicians:

1. Standard or Normal RJ45 Connector
2. Pass-Through RJ45 Connector

Both can produce excellent Ethernet cables when the connector, cable and crimping tool are correctly matched. However, their physical construction and termination procedures are different.

Understanding these differences becomes particularly important when installing large numbers of network points, CCTV cameras, access points or structured cabling.

1. What Is an RJ45 Connector?

An RJ45-style Ethernet plug contains eight electrical contacts corresponding to the eight conductors inside a typical four-pair Ethernet cable.

Typical cables include:

• Cat5e
• Cat6
• Cat6A
• UTP cable
• F/UTP and other shielded cable variants

The eight conductors are arranged according to a defined wiring standard and then electrically contacted by the connector during crimping.

The connector typically contains:

• Plastic connector body
• Eight conductor channels
• Eight metal contact pins
• Locking tab
• Cable entry
• Cable retention/crimp area
• Sometimes an internal load bar or guide

A boot may also be fitted over the connector to provide additional strain relief and protect the locking tab.

2. RJ45 Pin Numbering

Looking at an RJ45-style plug with the contacts facing you and using the appropriate orientation, the connector has eight contact positions:

Pin 1 through Pin 8

Correct conductor placement is essential.

Even if all eight wires have electrical continuity, an incorrectly paired cable can still have poor network performance.

This is because Ethernet depends not merely on eight individual conductors, but on correctly maintained twisted pairs.

3. T568A and T568B Wiring Standards

Two common Ethernet termination schemes are:

T568A

Pin sequence:

1. White/Green
2. Green
3. White/Orange
4. Blue
5. White/Blue
6. Orange
7. White/Brown
8. Brown

T568B

Pin sequence:

1. White/Orange
2. Orange
3. White/Green
4. Blue
5. White/Blue
6. Green
7. White/Brown
8. Brown

T568B is commonly encountered in many installations, although either standard can be used where appropriate.

For a normal straight-through Ethernet cable, the important requirement is generally:

Use the same standard at both ends.

For example:

T568B → T568B

or

T568A → T568A

Consistency across an installation is extremely important.

4. What Is a Standard or Normal RJ45 Connector?

A traditional RJ45 connector has a closed front end.

The eight conductors enter from the rear of the plug and must stop at the correct position inside the connector.

They cannot pass through the front.

The technician therefore needs to:

1. Remove the required amount of outer cable jacket.
2. Separate the four twisted pairs.
3. Arrange conductors according to T568A or T568B.
4. Straighten the conductors.
5. Trim all eight conductors evenly.
6. Insert them into the connector.
7. Visually verify that every conductor has reached the end.
8. Confirm the colour sequence.
9. Crimp the connector.
10. Test the completed cable.

This method has been used successfully for Ethernet cabling for decades.

5. Main Difficulty with Standard RJ45 Connectors

The biggest challenge is getting all eight wires simultaneously:

• In the correct order
• Straight
• Equal in length
• Fully inserted
• Inside the correct channels

Suppose one conductor is slightly shorter than the others.

It may fail to reach its contact properly.

The connector may appear correctly installed externally while one wire is not properly terminated.

This can cause:

• Open circuit
• Intermittent connection
• Network negotiation problems
• Reduced Ethernet speed
• Packet errors
• PoE problems
• Unstable IP camera connectivity

This is why proper inspection and testing are essential.

6. What Is a Pass-Through RJ45 Connector?

A pass-through RJ45 connector changes the physical termination process.

Instead of stopping inside the connector, the individual conductors pass completely through openings at the front.

The installer can therefore see the wires extending beyond the plug.

This makes it much easier to verify the conductor sequence before final termination.

For example, when using T568B, the technician can visually confirm:

White/Orange – Orange – White/Green – Blue – White/Blue – Green – White/Brown – Brown

before completing the crimp.

7. How Pass-Through RJ45 Works

The typical procedure is:

1. Strip the cable jacket.
2. Arrange the conductors.
3. Straighten them sufficiently for insertion.
4. Push all eight conductors through the connector.
5. Pull or push the cable until the jacket and pairs are positioned correctly.
6. Verify the colour sequence.
7. Insert the connector into a compatible pass-through crimping tool.
8. Crimp the contacts.
9. Trim the conductors flush at the connector face.
10. Test the cable.

Many dedicated pass-through crimpers perform the crimping and trimming operation together.

This is one of the major advantages of the system.

8. Standard RJ45 vs Pass-Through RJ45

Feature	Standard RJ45	Pass-Through RJ45
Front	Closed	Conductors pass through
Wire inspection	More difficult	Easier
Wire alignment	Requires more practice	Easier
Pre-cutting accuracy	Important	Less critical
Colour verification	Before/through plug	Very easy before final crimp
Termination speed	Moderate	Usually faster
Beginner friendliness	Moderate	High
Special crimper	Conventional RJ45 crimper	Pass-through compatible crimper preferred
Connector cost	Usually lower	Often slightly higher
Installation consistency	Depends heavily on technique	Often easier to achieve
Field termination	Good	Very convenient
Professional use	Excellent	Excellent when properly implemented

9. Advantages of Standard RJ45 Connectors

9.1 Lower Connector Cost

Traditional RJ45 plugs are manufactured in extremely high volumes and are usually inexpensive.

This becomes significant when terminating hundreds or thousands of cables.

9.2 Widely Available

Standard plugs and crimping tools are available almost everywhere networking equipment is sold.

9.3 Mature and Proven Design

Traditional modular plugs have been used in networking installations for many years.

When properly terminated, they are highly reliable.

9.4 No Exposed Cut Conductor Ends at the Front

Because the conductors terminate internally, there are no pass-through wire ends requiring flush trimming at the connector nose.

9.5 Large Selection

Traditional connectors are available for:

• Cat5e
• Cat6
• Cat6A
• Solid conductors
• Stranded conductors
• Different conductor gauges
• Shielded cable
• Unshielded cable

10. Disadvantages of Standard RJ45 Connectors

10.1 Requires More Skill

The technician must cut and align all eight wires correctly before inserting them.

10.2 Harder to Verify Full Insertion

A conductor may look correct but may not have reached the front of the plug.

10.3 Greater Chance of Misalignment

A wire can move to the wrong channel during insertion.

10.4 More Time for Beginners

Technicians with limited cabling experience may need several attempts to produce a good termination.

10.5 Greater Dependence on Preparation

If conductors are cut unevenly, insertion becomes difficult.

11. Advantages of Pass-Through RJ45 Connectors

11.1 Easier Colour Verification

This is perhaps the biggest practical advantage.

Because wires extend through the connector, the installer can inspect the complete sequence before crimping.

11.2 Faster Termination

There is less need to precisely cut all eight conductors to identical lengths before insertion.

11.3 Easier for Beginners

Pass-through connectors reduce some of the hand skill required for traditional termination.

11.4 Easier Full-Conductor Insertion

Because the conductors emerge through the front, it is immediately obvious that every conductor has passed through its channel.

11.5 Helpful for High-Volume Installation

When installing many:

• IP cameras
• Wireless access points
• Office network points
• VoIP phones
• Network devices

the time saved per termination can become significant.

11.6 Easier Visual Quality Control

Before crimping, another technician can quickly inspect the colour order.

12. Disadvantages of Pass-Through RJ45 Connectors

Pass-through plugs are convenient, but they are not automatically superior in every situation.

12.1 Requires a Suitable Crimping Tool

A conventional RJ45 crimper may crimp the plug but may not properly cut the protruding conductors.

A proper pass-through crimper is therefore recommended.

12.2 Poor Cutting Can Cause Problems

The conductor ends should be cut cleanly and flush.

If they protrude from the connector, termination quality can be compromised.

12.3 Connector and Tool Must Match

Not every pass-through plug works optimally with every crimper.

12.4 Usually More Expensive

Pass-through connectors often cost more than conventional plugs.

12.5 Poor-Quality Connectors Can Create Reliability Problems

Cheap connectors may have:

• Weak plastic bodies
• Poor contact plating
• Incorrect conductor channels
• Poor dimensional tolerances
• Weak locking tabs

Connector quality matters more than simply choosing "standard" or "pass-through."

13. Does Pass-Through RJ45 Improve Network Speed?

Not inherently.

A correctly terminated standard connector and a correctly terminated pass-through connector should both support the network performance for which the cable/connector system is rated.

A pass-through connector does not magically increase:

• Mbps
• Gigabit speed
• Internet speed
• LAN throughput

Its primary benefit is installation convenience and easier visual verification.

However, indirectly, pass-through connectors may reduce termination mistakes. Fewer termination errors can result in more reliable links.

14. Does RJ45 Connector Quality Affect Gigabit Ethernet?

Yes.

For 1000BASE-T Gigabit Ethernet, all four twisted pairs are used.

Therefore, poor termination of even one pair can prevent proper Gigabit operation.

Possible symptoms include:

• No link
• Intermittent link
• Negotiation at a lower speed
• Packet errors
• Link instability
• PoE issues

This is why a cable should not be judged simply because a link LED turns on.

15. Importance of Maintaining Twisted Pairs

One of the most important principles in Ethernet termination is:

Do not untwist more conductor length than necessary.

Ethernet cables use twisted pairs to control electromagnetic interference and crosstalk.

Excessive untwisting near the connector can degrade electrical performance.

This becomes increasingly important as Ethernet speeds and cable categories increase.

A visually neat connector is therefore not necessarily an electrically excellent connector.

16. Keep the Cable Jacket Inside the Connector

A common installation mistake is removing too much outer jacket.

Ideally, the cable should enter far enough into the plug that the connector's strain-relief mechanism grips the outer jacket, not merely the individual conductors.

Bad termination:

Cable jacket → long exposed individual wires → RJ45

Better termination:

Cable jacket → minimal exposed conductors → RJ45

This improves:

• Mechanical strength
• Strain relief
• Pair geometry
• Long-term reliability

17. Cat5e and Cat6 RJ45 Connectors Are Not Always Interchangeable

A common mistake is assuming that every RJ45 plug can be fitted to every Ethernet cable.

The connector must match characteristics such as:

• Cable category
• Conductor diameter
• Conductor insulation diameter
• AWG
• Solid vs stranded conductor
• Cable jacket diameter
• Shielding design

Cat6 cables, for example, may have larger conductors and thicker insulation than Cat5e.

Some Cat6 cables also contain a central separator or spline.

A plug designed for thin Cat5e conductors may therefore not properly accommodate a particular Cat6 cable.

18. Solid vs Stranded Ethernet Cable

Ethernet cable conductors may be:

Solid conductor

Each conductor consists of one solid copper wire.

Commonly used for:

• Permanent structured cabling
• Wall-to-wall cable runs
• Patch panel installations

Stranded conductor

Each conductor contains multiple fine copper strands.

Commonly used for:

• Patch cords
• Flexible cables
• Device connections

RJ45 plugs should be selected according to conductor construction.

The contact design can differ between plugs intended for solid and stranded conductors.

19. UTP vs Shielded RJ45 Connectors

UTP stands for Unshielded Twisted Pair.

A conventional plastic RJ45 connector is commonly used with UTP cable.

Shielded cabling may require a shielded connector containing a metallic housing.

The shield must be correctly maintained throughout the cabling system if the installation is designed as a shielded system.

Simply installing a metal RJ45 plug does not automatically create effective shielding.

20. RJ45 Connectors and Power over Ethernet

RJ45 terminations are particularly important in PoE environments.

Power over Ethernet can supply both network connectivity and electrical power to devices such as:

• IP cameras
• Wireless access points
• VoIP phones
• Access-control equipment
• IoT devices

A poor connection introduces resistance.

Resistance can generate heat when current passes through the contact.

For PoE installations, therefore, use:

• Correct cable
• Correct connector
• Quality contacts
• Proper crimping
• Appropriate cable category
• Proper testing

High-current PoE applications make connector and termination quality especially important.

21. RJ45 Connectors in CCTV Installations

Modern IP CCTV systems depend heavily on Ethernet cabling.

A typical architecture is:

IP Camera → RJ45 → Ethernet Cable → RJ45/Patch Panel → PoE Switch → Network/NVR/Server

Poor RJ45 termination can produce symptoms that may initially look like camera or network faults:

• Camera disconnecting randomly
• PoE restarting
• Camera showing offline
• Video freezing
• Packet loss
• Reduced link speed
• Intermittent recording
• Connection failure after cable movement

Therefore, RJ45 quality is particularly important for CCTV installations.

22. Common RJ45 Crimping Mistakes

Mistake 1: Wrong colour sequence

One or more wires are placed in incorrect pin positions.

Mistake 2: Excessive untwisting

Pairs are untwisted too far from the connector.

Mistake 3: Cable jacket does not enter the connector

Only individual conductors are mechanically held.

Mistake 4: Wire does not reach the contact

Common with poorly prepared traditional connectors.

Mistake 5: Wrong connector for cable

For example, conductor diameter is incompatible with the plug.

Mistake 6: Poor-quality crimping tool

Contacts are not pressed correctly.

Mistake 7: Pass-through wires are not cut flush

Protruding conductor ends indicate an unsuitable or poorly adjusted cutting process.

Mistake 8: Cable is not tested

Never assume a newly crimped cable is correct simply because it looks good.

23. Basic Cable Tester vs Professional Certification Tester

A basic LAN cable tester normally verifies:

• Continuity
• Open circuits
• Shorts
• Reversed wires
• Miswiring

Typical result:

1-2-3-4-5-6-7-8

This is useful but does not prove that the cable meets all Cat5e, Cat6 or Cat6A performance requirements.

Professional certification equipment can evaluate parameters such as:

• Wire map
• Cable length
• Insertion loss
• Return loss
• NEXT
• PSNEXT
• ACR-related parameters
• Propagation characteristics

Therefore:

Continuity test ≠ cable certification.

This distinction is important in professional structured-cabling projects.

24. Standard RJ45 Crimping Procedure

For T568B:

1. Cut the cable cleanly.
2. Strip a short section of outer jacket.
3. Separate the pairs only as much as required.
4. Arrange:

White/Orange – Orange – White/Green – Blue – White/Blue – Green – White/Brown – Brown

5. Straighten conductors.
6. Cut them evenly.
7. Insert them fully into the connector.
8. Confirm each conductor reaches the front.
9. Confirm the jacket enters the plug.
10. Insert the plug into the crimper.
11. Crimp completely.
12. Inspect.
13. Test using a LAN tester.

25. Pass-Through RJ45 Crimping Procedure

1. Cut the Ethernet cable cleanly.
2. Remove the required outer jacket.
3. Separate the pairs carefully.
4. Arrange conductors according to T568A or T568B.
5. Insert them through the pass-through plug.
6. Allow all eight conductors to extend through the front.
7. Verify the colour sequence.
8. Pull/push the cable into its final position while maintaining pair twists as close as practical to the termination.
9. Ensure the outer jacket reaches the strain-relief area.
10. Place the connector into a compatible pass-through crimper.
11. Crimp fully.
12. Ensure all protruding wires are cut flush.
13. Inspect the connector.
14. Test using a network cable tester.

26. Which Is Better: Standard or Pass-Through RJ45?

There is no universal answer.

Choose Standard RJ45 when:

• Your technicians are experienced.
• Connector cost is important.
• Existing tools are designed for standard plugs.
• You already have a reliable termination process.
• The specified cabling system requires a particular conventional plug.

Choose Pass-Through RJ45 when:

• Fast field termination is important.
• Technicians need easier colour verification.
• Many cables need to be terminated.
• You are working on CCTV or office LAN deployments.
• Reducing conductor-order mistakes is a priority.
• You have a quality compatible pass-through crimper.

For many field technicians, pass-through connectors are extremely convenient.

For professional structured cabling, however, the manufacturer's cable/connector compatibility and required performance rating should take priority over convenience.

27. Does Pass-Through Mean Better Quality?

No.

"Pass-through" describes the termination design, not automatically the manufacturing quality.

A high-quality conventional connector may be much better than a cheap pass-through connector.

Important factors include:

• Connector manufacturer
• Contact material
• Contact plating
• Mechanical tolerances
• Cable compatibility
• Crimp quality
• Installation technique

28. Gold-Plated Contacts

RJ45 connectors commonly use plated contact surfaces to provide reliable electrical connections and corrosion resistance.

However, marketing claims such as "gold plated" should not be considered sufficient proof of quality.

The overall connector design and compliance are more important than a vague plating claim.

For professional installations, purchase connectors from reputable manufacturers and verify their specifications.

29. Can Pass-Through RJ45 Be Used for Cat6?

Yes, provided the connector is specifically designed and rated for the cable being used.

Do not simply purchase a generic pass-through connector and assume that it supports every Cat6 cable.

Check:

• Supported cable category
• AWG range
• Insulation diameter
• Cable diameter
• Solid/stranded compatibility
• Shielded/unshielded compatibility

30. What About Cat6A and 10 Gigabit Ethernet?

10GBASE-T places considerably greater demands on cabling performance.

For higher-performance installations, connector selection and termination quality become even more important.

For Cat6A systems, use properly specified Cat6A components and follow the cabling manufacturer's termination instructions.

Do not assume that a connector marketed merely as "RJ45" is suitable for Cat6A or 10 Gigabit Ethernet.

31. Can Normal and Pass-Through Connectors Be Mixed?

Yes, electrically there is no requirement that both ends must use the same physical connector design.

For example:

Standard RJ45 → Cat6 cable → Pass-Through RJ45

can work correctly if both connectors are compatible with the cable and correctly terminated.

The electrical wiring standard matters, not whether one connector happens to be pass-through.

32. Can a Normal RJ45 Crimper Be Used for Pass-Through Connectors?

Sometimes it can crimp the contacts, but it normally cannot perform the essential front trimming operation correctly.

A dedicated pass-through crimper is strongly recommended because it is designed to:

• Crimp contacts
• Secure the cable
• Cut protruding conductors

often in one operation.

Using mismatched tools increases the possibility of poor termination.

33. RJ45 Cable Length Considerations

For conventional twisted-pair Ethernet structured cabling, the commonly referenced maximum channel length is 100 metres, typically consisting of up to 90 metres of permanent horizontal cabling plus patch cords within the overall channel allowance.

The RJ45 connector does not extend this limit.

Actual supported distance also depends on:

• Ethernet standard
• Cable category
• Installation quality
• Environmental interference
• Patch cords
• Connectors
• Intermediate components

34. CCA vs Pure Copper Cable

Connector quality cannot compensate for poor cable quality.

CCA – Copper Clad Aluminium cable uses aluminium conductors coated with copper.

For professional Ethernet and especially PoE installations, standards-compliant solid copper cable is strongly preferable.

CCA can introduce:

• Higher electrical resistance
• Greater voltage drop
• More heating
• Poorer PoE performance
• Mechanical fragility
• Standards/compliance concerns

For CCTV PoE deployments, conductor quality can directly affect camera stability over longer cable runs.

35. Troubleshooting a Newly Crimped RJ45 Cable

If the cable does not work:

Step 1 – Check colour sequence

Verify both ends.

Step 2 – Run a wire-map test

Check pins 1 through 8.

Step 3 – Inspect connector contacts

Confirm all contacts were properly crimped.

Step 4 – Check jacket insertion

Make sure cable tension is not being carried by individual conductors.

Step 5 – Check for excessive untwisting

Particularly important for higher-speed links.

Step 6 – Verify cable and connector compatibility

Confirm category, AWG and conductor type.

Step 7 – Re-terminate if uncertain

RJ45 plugs are generally treated as termination components rather than something to repeatedly remove and reinstall.

36. Best Practices for Professional RJ45 Installation

For reliable Ethernet cabling:

• Use good-quality pure copper Ethernet cable.
• Use connectors matched to cable category and conductor dimensions.
• Use the correct crimping tool.
• Maintain pair twists as close to the connector as practical.
• Avoid excessive jacket removal.
• Make sure the jacket is secured by the plug.
• Follow one wiring standard consistently.
• Inspect every termination.
• Test every cable.
• Label important cables.
• Avoid sharp cable bends.
• Keep data cables appropriately separated from electrical interference sources.
• Use shielded components only as part of a properly designed shielded cabling system.
• For commercial structured cabling, follow applicable cabling standards and manufacturer specifications.

37. Practical Recommendation for Network and CCTV Technicians

For day-to-day field work involving:

• IP CCTV
• Small office networks
• Wi-Fi access points
• Routers
• Switches
• Network printers
• VoIP phones
• Temporary network installations

quality pass-through connectors can significantly simplify termination.

A useful technician kit would include:

Quality Cat5e/Cat6 cable + matching pass-through connectors + professional pass-through crimper + cable stripper + LAN cable tester.

For permanent enterprise structured cabling, patch panels and keystone jacks are generally preferable for horizontal cabling, with factory-manufactured patch cords used between equipment wherever practical.

38. Standard RJ45 vs Pass-Through RJ45 – Final Verdict

Neither design is inherently faster electrically.

The key difference is how the cable is terminated.

Standard RJ45

Advantages

• Economical
• Widely available
• Proven technology
• Huge selection
• Excellent when installed correctly

Disadvantages

• Requires greater termination skill
• Harder to confirm wire insertion
• More preparation required
• Greater chance of conductor-order errors for inexperienced installers

Pass-Through RJ45

Advantages

• Easier conductor arrangement
• Excellent colour-code visibility
• Faster field installation
• Beginner friendly
• Easy to confirm all conductors entered the plug
• Particularly convenient for large CCTV/LAN projects

Disadvantages

• Usually slightly more expensive
• Requires a compatible crimper
• Wire ends must be trimmed correctly
• Poor-quality plugs can cause reliability problems

Therefore, the best connector is not simply "normal" or "pass-through."

The best termination is:

Correct cable + correctly matched connector + quality crimper + correct T568A/T568B wiring + proper installation technique + final cable testing.

Frequently Asked Questions – FAQ

1. What is an RJ45 connector?

RJ45 is the commonly used name for the modular connector used with twisted-pair Ethernet cables. The Ethernet plug commonly called RJ45 is technically an 8P8C modular connector.

2. What is a pass-through RJ45 connector?

It is an RJ45-style plug that allows all eight conductors to extend through the front during installation so their sequence can be checked before they are trimmed and crimped.

3. Is pass-through RJ45 better than normal RJ45?

It is generally easier and faster to terminate, but both can provide excellent network performance when properly installed.

4. Does pass-through RJ45 increase network speed?

No. Connector design itself does not increase Ethernet speed.

5. Can pass-through RJ45 support Gigabit Ethernet?

Yes, when the connector, cable and termination meet the required specifications.

6. Can pass-through RJ45 be used with Cat6?

Yes, provided the connector is specifically compatible with the particular Cat6 cable.

7. Do I need a special crimping tool?

A compatible pass-through crimper is strongly recommended because it can correctly trim the protruding conductors while crimping.

8. Can I use a normal crimper?

Some tools may crimp the contacts, but they may not correctly trim pass-through conductors. Use a tool designed for the connector.

9. What is T568B?

T568B is one of the standard conductor arrangements used for Ethernet termination.

10. What is the T568B colour order?

White/Orange, Orange, White/Green, Blue, White/Blue, Green, White/Brown, Brown.

11. What is T568A?

It is another recognized Ethernet wiring arrangement, differing primarily in the placement of the orange and green pairs compared with T568B.

12. Can T568A and T568B both support Gigabit Ethernet?

Yes. Either can support Gigabit Ethernet when the complete cable is correctly constructed.

13. Should both ends use the same wiring standard?

For an ordinary straight-through Ethernet cable, yes.

14. Why should twisted pairs remain twisted near the connector?

The twists help control electromagnetic interference and crosstalk. Excessive untwisting can degrade cable performance.

15. Why does my cable tester show all eight wires correctly but the network is slow?

A simple tester normally checks wire mapping and continuity. It may not detect performance problems such as excessive crosstalk, poor pair geometry or other signal-quality issues.

16. Can RJ45 connectors cause PoE camera problems?

Yes. Poor contact, incorrect termination or excessive resistance can cause voltage drop, intermittent connectivity and device restarts.

17. Is pass-through RJ45 good for CCTV?

Yes. It is particularly convenient when terminating large numbers of IP camera cables.

18. Are all Cat6 RJ45 connectors the same?

No. They may differ in conductor size, insulation diameter, cable diameter, shielding and solid/stranded compatibility.

19. Can I use Cat5e connectors on Cat6 cable?

Do not assume compatibility. Use connectors specifically rated and dimensioned for the cable being installed.

20. What is 8P8C?

It means 8 Position, 8 Contact, describing the modular connector configuration commonly used for Ethernet.

21. What causes an RJ45 cable to negotiate at only 100 Mbps instead of 1 Gbps?

Possible causes include bad termination, damaged conductors, incorrect pairing, defective connectors or cable problems. Gigabit Ethernet requires all four pairs.

22. Can I reuse a crimped RJ45 plug?

Generally, no. Once crimped, replacing it with a new connector is the appropriate practice.

23. Should I use CCA cable for PoE cameras?

Standards-compliant pure copper Ethernet cable is strongly preferred, particularly for PoE and longer cable runs.

24. Is a cable tester necessary after crimping?

Yes. At minimum, perform a wire-map/continuity test on every field-terminated cable.

25. Which RJ45 connector should a technician keep in the toolkit?

For frequent field installations, high-quality pass-through connectors matched to the commonly used cable, together with a compatible crimper, can be extremely convenient.

Conclusion

RJ45 termination may look like a small part of network installation, but it can determine the reliability of the entire Ethernet link.

Traditional RJ45 connectors remain economical, proven and reliable. Pass-through RJ45 connectors simplify conductor alignment and visual verification and can substantially improve installation efficiency, particularly for technicians terminating many cables.

The most important lesson is that connector type alone does not determine network quality.

Cable category, conductor material, connector compatibility, pair geometry, crimping quality, wiring sequence, tooling and testing all contribute to the final result.

For a professional installation, always remember:

Don't judge an Ethernet cable only because the link light is ON. A correctly wired cable must also maintain the electrical characteristics required by the Ethernet standard.

 

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