The small Green, Orange/Amber and blinking LEDs on a network switch or PoE switch are among the quickest diagnostic tools available to an IT engineer. Before opening a switch configuration page, running a ping test, replacing a CCTV camera, or re-crimping an RJ45 connector, a technician can often learn important information simply by observing the LEDs.

Depending on the switch model, LEDs may indicate:

• Physical Ethernet link status
• Network traffic/activity
• Negotiated Ethernet speed
• PoE power delivery
• PoE fault or overload
• Switch system status
• Uplink/SFP status
• Port administrative status
• STP or loop-related conditions
• Power supply or hardware faults

However, there is one extremely important point:

LED colors are not universally standardized across all network switches.

A green LED may indicate 1 Gbps on one switch but simply indicate Link Up on another. An orange LED might indicate 100 Mbps, a PoE condition, a blocked port, or a fault depending on the manufacturer and model.

Therefore, LED indications should always be interpreted together with the switch's manual, printed LED legend, management interface, or datasheet.

1. What Are the LEDs Beside an Ethernet Port?

Most Ethernet switches provide one or more LEDs for each RJ45 port.

Common labels include:

LINK

Indicates whether a physical Ethernet connection has been established.

ACT / Activity

Indicates network traffic passing through the port.

LINK/ACT

One LED performs both functions. It may remain continuously illuminated when connected and blink when traffic is transmitted or received.

SPEED

Indicates negotiated Ethernet speed.

PoE

Indicates whether the port is supplying Power over Ethernet.

STATUS

On managed switches, the same port LEDs may display different information depending on the currently selected LED mode.

2. What Does a Solid Green Light Normally Mean?

In many switches, a solid green LED means that an Ethernet link has successfully been established.

For example:

PC → CAT6 cable → Network Switch

If the PC and switch successfully negotiate an Ethernet connection, the switch port may become solid green.

A solid green LED generally suggests:

• Cable is physically connected.
• Ethernet link negotiation has completed.
• Network Interface Card is active.
• Switch port is enabled.
• Physical-layer communication exists.

But it does not necessarily mean that Internet or network communication is working correctly.

A PC can have a green link LED and still have:

• Wrong IP address
• Duplicate IP
• Incorrect subnet mask
• Wrong gateway
• DNS problem
• VLAN mismatch
• DHCP failure
• Firewall problem
• Internet outage

Therefore:

Green LED = usually physical link OK

It does not automatically mean:

Green LED = Internet OK

3. What Does a Blinking Green Light Mean?

A blinking green LED normally represents network activity.

The port is transmitting or receiving Ethernet frames.

For example:

IP Camera → PoE Switch → NVR

The camera continuously sends video packets toward the NVR.

The switch LED may therefore blink almost continuously.

This is completely normal.

The amount and pattern of blinking depend on network traffic.

Examples:

Device	Typical LED Activity
Idle desktop PC	Occasional blinking
CCTV IP camera	Frequent/continuous blinking
NAS during backup	Very rapid blinking
Printer	Mostly idle, blinking during printing
Access point	Frequent activity
Server	Often continuous activity
VoIP phone	Regular activity during calls

Therefore, a rapidly blinking LED does not automatically indicate a problem.

4. Does Faster Blinking Mean Faster Network Speed?

Not necessarily.

Blinking generally indicates activity, not actual link speed.

For example, a 100 Mbps connection transferring continuously may blink heavily, while a 1 Gbps connection sitting idle may hardly blink.

To determine actual negotiated speed, check:

• Dedicated Speed LED
• Switch management interface
• Windows Ethernet Status
• NIC properties
• Managed switch port statistics

Do not estimate Ethernet speed simply from blinking frequency.

5. What Does an Orange or Amber Light Mean?

This is where technicians need to be particularly careful.

An orange/amber LED does not have one universal meaning.

Depending on the switch, it could indicate:

Possibility 1 — Lower Ethernet Speed

Some Gigabit switches use colors similar to:

Green = 1000 Mbps

Orange/Amber = 10/100 Mbps

Consider:

Gigabit Switch → CAT6 → Computer

If the computer should negotiate at 1 Gbps but the switch displays orange, the connection may have fallen back to 100 Mbps.

Possible causes include:

• Damaged Ethernet cable
• Poor RJ45 crimping
• Incorrect punch-down
• Broken wire pair
• Only two Ethernet pairs connected
• Old 100 Mbps network card
• Device supports only 100 Mbps
• Manual speed setting
• Faulty patch panel termination

6. Why Can a CAT6 Cable Work at 100 Mbps but Not 1 Gbps?

This is an important troubleshooting concept.

10BASE-T and 100BASE-TX normally use two wire pairs, whereas 1000BASE-T uses all four pairs.

Therefore, a damaged cable can sometimes still establish a 100 Mbps connection.

For example:

Pairs 1–2 and 3–6 = working
Another required pair = faulty

The connection might still negotiate at 100 Mbps instead of 1 Gbps.

Therefore, an unexpected amber/orange speed indication can sometimes reveal a cabling problem.

Use a cable tester or certification tester to verify all four pairs.

7. Orange Light Can Also Mean Normal Operation

Do not immediately assume that an orange light means a fault.

Some manufacturers use amber to indicate:

• 10 Mbps
• 100 Mbps
• PoE operation
• Port status
• STP state
• Port disabled
• Link speed
• Duplex condition
• Hardware fault

Always check the particular switch model.

8. What Does Blinking Orange/Amber Mean?

Blinking orange can have several meanings depending on the equipment.

It may indicate:

• Network traffic at a particular negotiated speed
• PoE detection
• PoE fault
• STP transition
• Port blocking
• Network loop
• Port error
• Diagnostic state

For example, if a switch uses:

Amber = 100 Mbps

then:

Blinking amber = 100 Mbps link with network activity

That can be completely normal.

On another managed switch, however, blinking amber might indicate a fault or special port state.

9. Understanding Two LEDs on an RJ45 Port

Many Ethernet ports contain two LEDs.

A common arrangement is:

LED 1 = Link/Activity

LED 2 = Speed

Example interpretation:

LED	Possible Meaning
Green solid	Link established
Green blinking	Network activity
Amber solid	100 Mbps
Amber blinking	100 Mbps + activity
No LED	No physical link

But again, this is only a common implementation—not a universal standard.

10. What Does No Light on a Switch Port Mean?

If an Ethernet cable is connected but no port LED appears, check the physical layer first.

Possible causes:

1. Cable disconnected
2. Bad RJ45 connector
3. Incorrect crimping
4. Broken cable
5. Bad I/O/keystone termination
6. Patch panel termination problem
7. Network card disabled
8. Device powered off
9. Switch port disabled
10. Faulty switch port
11. Faulty NIC
12. Device not booted
13. Cable length or quality problem

A simple test is:

Device → Known-good patch cable → Known-good switch port

If the LED appears, troubleshoot the original cable or port.

11. Green LED Does Not Guarantee a Good Cable

This is another important field troubleshooting point.

A switch can show a link LED even when the cable has:

• Intermittent connection
• High resistance
• Poor termination
• Excessive untwisting
• Split pairs
• Damaged conductor
• Poor-quality CCA cable
• EMI interference
• Marginal signal quality

The connection may work but suffer from:

• Packet loss
• CRC errors
• Speed dropping
• Frequent disconnects
• CCTV video freezing
• Slow file transfers
• Unstable PoE

A proper cable tester or certification tool provides much more information than an LED alone.

12. PoE Switch LEDs Are More Complicated

A PoE switch performs two separate functions:

Data

It transfers Ethernet traffic.

Power

It supplies DC power to compatible devices.

Typical Powered Devices (PDs) include:

• IP cameras
• Wi-Fi access points
• VoIP phones
• Intercom systems
• Access control devices
• PoE speakers
• IoT devices

Therefore, a PoE switch may have separate:

LINK/ACT LED

and

PoE LED

for the same port.

13. What Does the PoE LED Mean?

A PoE LED typically indicates whether the switch is supplying power to the connected device.

A common sequence is:

Cable connected → PoE detection → Power classification/negotiation → Power supplied → Device boots → Ethernet link established

Therefore, it is possible to have PoE power but still not have a working network connection.

14. PoE Green Light but Camera Is Offline

Suppose:

PoE LED = Green

but

IP camera = Offline

This usually means the switch is supplying power, but you still need to troubleshoot data/network communication.

Possible causes:

• Camera IP address changed
• Wrong subnet
• Duplicate IP address
• Camera password changed
• NVR authentication failure
• VLAN configuration issue
• Damaged Ethernet data pair
• Camera software failure
• Camera boot problem
• NVR configuration problem
• Routing problem

Therefore:

PoE LED ON ≠ Camera communication confirmed

15. Link LED Working but PoE Device Does Not Power On

The reverse situation is also possible.

You may have:

LINK LED = Active

but the device is not receiving PoE power as expected.

Check:

• Is the switch port actually PoE-capable?
• Is PoE enabled on that port?
• Does the device support standard PoE?
• Does the device require passive PoE?
• Does the device require more wattage?
• Has the switch exceeded its total PoE budget?
• Is the cable suitable?
• Is there a PoE fault?

16. Understanding IEEE PoE Standards

Common PoE standards include:

Standard	Common Name	General Application
IEEE 802.3af	PoE	Lower-power devices
IEEE 802.3at	PoE+	Higher-power cameras/APs
IEEE 802.3bt	PoE++ / higher-power PoE	High-power network devices

The exact power available to the end device depends on the standard, switch capability, cable losses, device classification and implementation.

Always check both:

Switch PoE specification

and

Powered device requirement

17. What Is PoE Power Budget?

A PoE switch may advertise several PoE ports, but its total power supply has a maximum available PoE budget.

For example, imagine an 8-port switch with:

Total PoE budget = 120 W

If connected devices collectively request more power than the switch can provide, some ports may fail to power devices.

The switch may indicate this through:

• PoE fault LED
• Amber LED
• Flashing PoE LED
• System warning LED
• Management interface alert

Never calculate PoE capacity based only on the number of ports.

18. Example: CCTV Camera Offline

Consider:

IP Camera → CAT6 → PoE Switch → NVR

Camera is offline.

Observe the switch.

Situation A: No PoE LED + No Link LED

Possible causes:

• Cable disconnected
• Bad RJ45
• Cable damaged
• Camera disconnected
• Switch port problem

Situation B: PoE LED ON + No Link LED

Camera may be receiving power but Ethernet communication is not established.

Check:

• RJ45 termination
• Cable pairs
• Camera Ethernet interface
• Camera boot condition
• Switch port

Situation C: PoE LED ON + Link LED blinking

Physical connectivity and traffic probably exist.

Next check:

• Camera IP
• Ping
• NVR password
• Camera credentials
• Subnet
• VLAN
• ONVIF
• Camera/NVR compatibility

Situation D: PoE LED flashing abnormal color

Check:

• PoE overload
• Device power requirement
• Short circuit
• Cable fault
• PoE budget
• Switch manual

19. What Does Extremely Fast Continuous Blinking Mean?

Rapid blinking can simply indicate high network traffic.

Examples include:

• CCTV video streams
• Backup operations
• File transfers
• NAS synchronization
• Software updates
• Network scanning

However, if many or all switch ports suddenly blink extremely rapidly at the same time, investigate further.

Possible causes include:

• Broadcast storm
• Network loop
• Malware-generated traffic
• Multicast flooding
• Incorrect switch configuration
• STP issue

20. Network Loop and Switch LEDs

A physical network loop can produce extremely heavy traffic.

Example:

Switch Port 1 → another switch → Switch Port 2

with an unintended redundant connection and no effective loop protection.

The result can be a broadcast storm.

Symptoms may include:

• Many LEDs blinking continuously
• Network extremely slow
• Internet unavailable
• High switch CPU
• Packet loss
• Switch management inaccessible
• Entire LAN becoming unstable

Managed switches use protocols/features such as Spanning Tree Protocol (STP/RSTP) and loop protection to prevent or control these situations.

21. Amber LED on a Managed Switch

On a managed switch, an amber LED can mean considerably more than speed.

Depending on manufacturer and LED mode, it might indicate:

• STP blocking
• Port disabled
• Port error
• Link fault
• Duplex issue
• PoE fault
• Security violation
• Diagnostic state

Therefore, managed switches should be checked through their management interface.

Look at:

Port Status → Port Statistics → Errors → PoE Status → VLAN → STP

22. Check Port Statistics

LEDs provide a quick indication, but switch statistics provide deeper evidence.

Look for:

• CRC errors
• FCS errors
• Input errors
• Output errors
• Dropped packets
• Collisions
• Link flaps
• Speed/duplex
• PoE consumption

For example, a port may appear normal with a blinking green LED but show thousands of CRC errors.

That points toward a physical-layer issue such as:

• Cable problem
• RJ45 termination problem
• Interference
• Faulty NIC
• Faulty switch port

23. Green vs Orange as Speed Indicator

A frequently encountered implementation is:

LED Color	Possible Speed
Green	1000 Mbps
Orange/Amber	100 Mbps
No speed LED	10 Mbps or no link

But some switches use completely different combinations.

Newer switches may support:

• 1 Gbps
• 2.5 Gbps
• 5 Gbps
• 10 Gbps

Two colors alone may therefore be insufficient to represent every speed.

Always consult the device-specific documentation.

24. Why Does My Gigabit Switch Show Orange?

If the manufacturer's documentation confirms that orange means 100 Mbps, check:

Step 1 — Device capability

Confirm that both endpoints support Gigabit Ethernet.

Step 2 — Replace patch cable

Use a known-good CAT5e/CAT6 cable.

Step 3 — Test all eight conductors

Gigabit Ethernet requires all four pairs.

Step 4 — Check RJ45 crimping

Follow T568A or T568B consistently.

Step 5 — Check I/O and patch panel

A poor punch-down can cause fallback to 100 Mbps.

Step 6 — Check NIC settings

Use Auto Negotiation unless there is a specific reason to configure speed manually.

Step 7 — Try another switch port

This helps isolate a defective port.

25. Can Wrong RJ45 Color Coding Cause an Orange LED?

Yes, depending on how incorrectly the cable was terminated.

Correct Ethernet wiring commonly uses:

T568A

or

T568B

Both ends should normally use the same scheme for a standard straight-through cable.

Poorly terminated or incorrectly paired conductors can cause:

• No link
• 100 Mbps instead of 1 Gbps
• Packet errors
• Intermittent connection
• PoE instability

A basic continuity tester is useful, but professional certification equipment can identify problems that a simple continuity tester cannot.

26. PoE and Data Can Fail Independently

Remember this principle:

PoE power and Ethernet data are related but separate diagnostic conditions.

You may encounter:

Power YES + Data YES

Normal operation.

Power YES + Data NO

Device receives power but network communication fails.

Power NO + Data YES

Network communication may exist while PoE is disabled, unsupported, or not required.

Power NO + Data NO

Check cable, switch port, device and physical connectivity.

This concept is especially useful for CCTV troubleshooting.

27. Switch Power/System LED

Apart from individual port LEDs, switches often have a system LED.

Possible labels include:

• PWR
• POWER
• SYS
• SYSTEM
• STATUS
• FAULT

Typical meanings may include:

Solid Green

Switch operating normally.

Blinking Green

Booting or normal system heartbeat.

Amber/Orange

Warning, boot condition or fault.

Red

Potential serious hardware/power fault.

Again, the exact meaning is manufacturer-specific.

28. SFP/Uplink LEDs

Managed switches may include SFP/SFP+ fiber or uplink ports.

Their LEDs can indicate:

• Optical link established
• Data activity
• Link speed
• Transceiver fault
• Unsupported module
• Fiber connection problem

When troubleshooting fiber, also check:

• Correct SFP type
• Matching wavelength
• Single-mode vs multimode
• TX/RX polarity
• Fiber cleanliness
• Compatible speed
• Transceiver compatibility

29. LED Troubleshooting Quick Reference

LED Condition	Common Interpretation	What to Check
No LED	No physical link	Cable, RJ45, device power, port
Solid green	Link established	Usually normal
Blinking green	Network activity	Usually normal
Solid amber	Often lower speed or special status	Speed/manual
Blinking amber	Activity or warning depending on model	Manual + port status
PoE green	PoE power being supplied	Usually normal
PoE amber	Possible PoE condition/fault	Power budget/device
All ports rapidly blinking	Heavy traffic/possible loop	Network topology/STP
System amber/red	Possible switch fault	Switch logs/manual

Important: This table describes common behavior only. Manufacturer documentation takes priority.

30. Practical Troubleshooting Procedure

When troubleshooting a switch port, use this sequence:

1. Observe the LEDs

Record color, solid/blinking condition and which LEDs are active.

2. Check the switch legend

Look for labels such as LINK/ACT, SPEED and PoE.

3. Check device power

Make sure the connected device is switched on.

4. Replace the patch cable

Use a known-good cable.

5. Change switch port

Move the cable to another known-good port.

6. Test cable

Verify all eight conductors.

7. Check negotiated speed

Confirm 100 Mbps, 1 Gbps, 2.5 Gbps, etc.

8. Check IP configuration

Run:

ipconfig /all

Check IP address, subnet mask, gateway and DNS.

9. Test communication

Ping the local gateway and required network device.

10. Check managed-switch statistics

Look for CRC errors, link flaps, drops, VLAN status and PoE consumption.

This approach prevents unnecessary replacement of cameras, switches and other network hardware.

31. Important Example: Orange Is Not Automatically Bad

Suppose you connect an older IP camera supporting only 10/100 Mbps to a Gigabit PoE switch.

The switch shows:

Orange/Amber + blinking

If the manufacturer's LED specification says amber represents 100 Mbps, this is perfectly normal.

The camera cannot negotiate at 1 Gbps because its Ethernet interface supports only 100 Mbps.

For most CCTV cameras, 100 Mbps can still be more than sufficient for the camera's actual video bitrate.

Therefore, do not replace cables or cameras solely because a Gigabit switch port displays amber.

32. CCTV Installation Example

Consider 16 IP cameras connected to a PoE switch.

You observe:

• Ports 1–15: Green/blinking
• Port 16: No LED

Camera 16 is offline.

Start with:

1. Check camera power/PoE indication.
2. Disconnect and reconnect RJ45.
3. Test camera using a short known-good cable.
4. Move camera to a known-good PoE port.
5. Test the original CAT6 cable.
6. Inspect RJ45 termination.
7. Check PoE status.
8. Check camera IP.
9. Ping camera.
10. Check NVR configuration.

This systematic process tells you whether the problem follows the:

Camera, cable, connector, switch port, PoE supply or network configuration.

33. Common Mistakes When Reading Switch LEDs

Mistake 1: Assuming green means Internet is working

Green normally represents a link or another manufacturer-defined condition—not necessarily Internet access.

Mistake 2: Assuming orange means fault

Orange may simply indicate 100 Mbps.

Mistake 3: Assuming blinking means network problem

Blinking usually means traffic.

Mistake 4: Assuming a PoE LED means camera communication is working

PoE power and network communication are separate.

Mistake 5: Ignoring the manufacturer's LED guide

There is no universal green/orange definition for every switch.

Mistake 6: Replacing the switch before testing the cable

Cabling and termination problems are extremely common.

34. Best Tools for Troubleshooting Switch LEDs

An IT technician should ideally have:

• RJ45 cable tester
• PoE tester
• Known-good CAT6 patch cable
• Laptop with Gigabit Ethernet
• Network scanner
• Ping/traceroute tools
• Managed switch access
• Cable toner/probe
• Professional cable certification tester for advanced work

For CCTV installations, a PoE/network camera tester can be especially useful.

35. Final Technical Summary

The easiest way to remember switch LEDs is:

Solid Green

Usually means a physical link has been established.

Blinking Green

Usually means Ethernet traffic/activity.

Solid Orange/Amber

May represent lower negotiated speed, special port status or warning.

Blinking Orange/Amber

May represent traffic at a particular speed, PoE status, STP state or fault depending on the switch.

No Light

Usually means no physical Ethernet link, although the exact behavior depends on the switch.

PoE Green

Typically means PoE power is being supplied.

PoE Amber/Flashing

May indicate PoE detection, overload, insufficient budget or another PoE-related state.

The most important rule is:

Never diagnose a network switch solely by LED color. First identify what that particular LED represents—LINK/ACT, SPEED, PoE, SYSTEM or STATUS—and then consult the manufacturer's LED table for that exact switch model.

LEDs are excellent first-level diagnostic indicators, but cable testing, port statistics, IP testing and PoE measurements are required for accurate troubleshooting.

FAQ

1. What does a green light on a network switch mean?

It commonly indicates that an Ethernet link has been established. On some switches, however, green can specifically represent a particular link speed or status.

2. What does a blinking green switch light mean?

Usually network traffic. The switch is transmitting or receiving Ethernet frames through that port.

3. Is blinking green normal?

Yes. On active devices such as CCTV cameras, servers, access points and NAS systems, frequent blinking is normal.

4. What does an orange light on an Ethernet switch mean?

It depends on the switch. It may indicate a lower Ethernet speed such as 100 Mbps, or it may indicate a special status, warning, STP condition or PoE state.

5. Does orange mean the network cable is faulty?

Not necessarily. If orange means 100 Mbps and the connected device supports only 100 Mbps, it is completely normal.

6. Why is my Gigabit switch port orange?

If orange represents 100 Mbps on your switch, either the connected device supports only 100 Mbps or the connection has negotiated down because of cabling, termination or configuration issues.

7. Can a damaged CAT6 cable still connect?

Yes. A partially damaged cable may still establish a connection and can sometimes negotiate at a lower speed.

8. Why does my switch show green but there is no Internet?

The physical Ethernet link can be working while DHCP, DNS, gateway, VLAN, routing, firewall or Internet connectivity is failing.

9. Why is my CCTV camera offline even though the switch LED is blinking?

Physical network activity may exist while the camera has an incorrect IP address, authentication problem, VLAN issue, NVR configuration problem or another logical/network issue.

10. What does a PoE green LED mean?

It commonly indicates that PoE power is being supplied to the connected powered device.

11. Can PoE be working while Ethernet data is not working?

Yes. Power and data should be diagnosed separately.

12. Can Ethernet data work without PoE?

Yes. The device may have another power source, or PoE may be disabled/not required.

13. What does no LED on a connected port mean?

Usually there is no physical link. Check the cable, RJ45 connectors, connected device, NIC, switch port and power.

14. Why are all switch LEDs blinking very rapidly?

Heavy legitimate traffic can cause this, but sudden rapid blinking across many ports may also indicate a broadcast storm or network loop.

15. Does blinking indicate packet loss?

No. Blinking normally indicates activity. Packet loss must be diagnosed using ping tests, switch statistics and error counters.

16. Can a bad RJ45 connector reduce speed from 1 Gbps to 100 Mbps?

Yes. Gigabit Ethernet requires all four wire pairs, so termination problems can cause negotiation failure or fallback.

17. Should network adapters be manually configured to 1 Gbps?

Normally, Auto Negotiation is recommended unless a specific network design or troubleshooting requirement calls for manual settings.

18. What are CRC errors?

CRC/FCS errors indicate Ethernet frames arriving corrupted. Large or increasing numbers may indicate cable, connector, interference, NIC or port problems.

19. Can a network switch LED identify a bad cable?

It can provide clues, such as no link or unexpectedly low speed, but a cable tester or certification tester provides a more reliable diagnosis.

20. Why is my 100 Mbps CCTV camera orange on a Gigabit PoE switch?

If the switch uses amber/orange for 100 Mbps, that is expected because the camera cannot negotiate a Gigabit connection.

21. Does a PoE switch automatically supply power to every connected device?

Standards-compliant PoE switches normally detect compatible powered devices before supplying PoE. Behavior can differ with passive PoE equipment, so specifications must be checked carefully.

22. What happens when a PoE switch exceeds its power budget?

The switch may refuse to power additional devices, disable certain PoE ports, or indicate a power-budget/fault condition.

23. Can a network loop cause switch LEDs to blink continuously?

Yes. A loop can generate excessive broadcast traffic and cause many ports to blink continuously while the network becomes slow or unusable.

24. Is green always 1 Gbps?

No. On some switches green represents Gigabit speed, while on others it simply represents an active link.

25. Is orange always 100 Mbps?

No. This is common on some equipment but is not a universal standard.

26. How can I know the exact meaning of my switch LEDs?

Check the exact model's user manual, datasheet, LED legend or management interface.

27. What should I check first when a PoE CCTV camera goes offline?

Check the PoE and Link/Activity LEDs, then test the cable, RJ45 termination, switch port, camera IP address and NVR configuration.

28. Can a switch port show activity even when the IP address is wrong?

Yes. Ethernet operates below IP, so Layer 2 traffic may exist even when Layer 3 IP configuration is incorrect.

29. Can an unmanaged switch diagnose network problems?

Only to a limited extent through LEDs. Managed switches provide much more useful information such as speed, errors, VLANs, PoE consumption and port statistics.

30. What is the most important rule when interpreting switch LEDs?

Never assume LED color alone has a universal meaning. Identify the LED function and verify the manufacturer's documentation for the exact model.

 

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