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D-Link DGS-1024D Error Codes, LED Indicators, Power Light Blinking, Cable Diagnostics and Complete Troubleshooting Guide

The D-Link DGS-1024D is a 24-port unmanaged Gigabit Ethernet switch commonly used in offices, server rooms, CCTV/network installations and small-to-medium bu...

Bison Technical Team Enterprise IT specialists

Updated 29 Aug 2026 18 min read 1 total views

The D-Link DGS-1024D is a 24-port unmanaged Gigabit Ethernet switch commonly used in offices, server rooms, CCTV/network installations and small-to-medium business networks.

Because it is an unmanaged switch, the DGS-1024D does not normally display software-generated or numeric error codes such as:

Error 01
E01
E02
PSU Error
Port Error 15

Instead, the switch communicates its operational status primarily through its Power LED and port Link/Act/Speed LEDs.

Therefore, when troubleshooting a DGS-1024D, the LED pattern effectively becomes the switch's diagnostic language.

D-Link documentation confirms that the switch also performs Cable Diagnostics during startup, which can identify common cable faults such as an open or short circuit.

Important: DGS-1024D has been manufactured in several hardware revisions. Front-panel design, diagnostic behavior and available DIP-switch features can vary between revisions. Always check the H/W Ver. printed on the product label before relying on revision-specific documentation.

1. Does the DGS-1024D Have Error Codes?

Not in the conventional sense.

There is no LCD screen, web-management console or CLI on a normal DGS-1024D from which numeric error codes can be retrieved.

Instead, use the following as diagnostic indicators:

Indication	Meaning
Power LED solid green	Switch has power
Power LED off	No power
Power repeatedly green → off → green	Abnormal power cycling/restarting if it continues
Port green solid	Gigabit link on applicable revisions
Port green blinking	Gigabit traffic/activity
Port amber solid	10/100 Mbps link during normal operation on applicable revisions
Port amber blinking	10/100 Mbps traffic/activity
LEDs sequentially blinking during startup	Cable diagnostics/startup sequence
Amber diagnostic result during boot	Open/short cable fault detected
Port LED completely off	No established link

Important: An amber port LED is not automatically an error.

During normal operation on current documented revisions, amber can simply indicate that the port negotiated at 10 or 100 Mbps rather than 1000 Mbps.

During the boot-time Cable Diagnostics, however, amber can indicate an open or short circuit in the connected Ethernet cable.

The timing of the indication therefore matters.

2. Power LED Solid Green

Indication

POWER: GREEN – ON

Meaning

Normal condition. The switch is receiving electrical power.

If network still does not work

A solid Power LED only confirms that the unit is powered. It does not prove that every Ethernet port or connected network path is functioning.

Check:

Individual port LEDs.
Ethernet cables.
Router/firewall/uplink connection.
PC/network adapter.
IP address configuration.
DHCP server.
Gateway.
DNS.
Possible network loop.
Whether another switch or router upstream has failed.

3. Power LED Completely Off

Indication

POWER: OFF

Possible causes

No AC input
Loose power cable
Faulty wall socket
Faulty UPS
Faulty extension board
Damaged power cable
Internal power-supply failure
Blown fuse or failed PSU component
Internal PCB fault

Troubleshooting

Disconnect every Ethernet cable from the switch.

Connect only the AC power.

Try:

Wall outlet → DGS-1024D

Temporarily bypass:

UPS
extension board
surge protector
power distribution strip

Try another known-good power cable where applicable.

If the Power LED remains completely off despite a verified AC source, an internal hardware fault becomes likely.

4. Power LED Green → Off → Green → Off Repeatedly

Indication

POWER: GREEN → OFF → GREEN → OFF continuously

This is particularly important because it is sometimes incorrectly interpreted as normal LED activity.

A continuously cycling Power LED is not the same as normal Ethernet activity.

D-Link documents the Power indicator as green when the switch is receiving power and off when it is not. Brief LED activity during initial startup can be normal, but repeated cycling after startup strongly suggests that the switch is repeatedly losing power or resetting.

Most likely causes

Internal SMPS/power-supply instability
Deteriorated electrolytic capacitor
PSU output voltage collapsing under load
Internal short circuit
Main PCB drawing excessive current
Failed voltage regulator
Thermal/hardware fault
Unstable AC source
Damaged power cable or connector

Isolation test

Disconnect all 24 Ethernet cables.

Leave only AC power connected.

Observe the switch for several minutes.

Result A – Power becomes stable

One connected device, cable or network condition may be contributing to the problem.

Reconnect the cables one at a time until the problem returns.

Result B – Power still cycles with no Ethernet cables connected

The fault is very likely internal to the switch or its power input.

Technician-level diagnosis

A qualified electronics technician can inspect:

PSU electrolytic capacitors
internal fuse
rectifier
switching MOSFET/controller
transformer
secondary rectifiers
output capacitors
voltage regulators
PCB for burn marks
damaged components
excessive heat

Measure PSU output rails and determine whether voltage rises and collapses at the same time as the Power LED.

Safety warning: The DGS-1024D uses an internal mains-powered supply on documented revisions. Opening the unit can expose hazardous voltage. Internal testing should only be performed by someone qualified to service mains-powered electronics.

5. All Port LEDs Flash During Power-On

This can be completely normal.

When the switch starts, its LEDs can briefly illuminate or blink as the unit resets and performs startup diagnostics.

D-Link documentation describes a boot-time Cable Diagnostics process.

Therefore:

LED activity for several seconds after turning the switch on = potentially normal

but:

The entire startup sequence continuously repeating = abnormal

If the sequence keeps starting again and again, suspect a reboot/power loop.

6. Sequential Green Port LEDs During Startup

Indication

Port LEDs appear to scan/blink sequentially.

Meaning

This can be the built-in Cable Diagnostics process.

The switch checks connected Ethernet cabling during boot.

Do not immediately diagnose a switch failure merely because LEDs blink sequentially for a short period after power-on.

Allow startup to finish.

7. Amber Port LED During Cable Diagnostics

Diagnostic indication

AMBER during boot diagnostic

Meaning

D-Link documentation identifies this as:

Open circuit or short circuit detected

Open circuit

An open circuit means electrical continuity is missing where it should exist.

Possible causes:

Broken conductor inside cable
RJ45 pin not making contact
Incorrectly crimped connector
Loose termination
Damaged patch panel
Damaged keystone
Partially inserted RJ45 plug

Short circuit

A short circuit means two or more conductors are unintentionally connected.

Possible causes:

Incorrect crimping
Copper strands touching
Damaged cable
Crushed cable
Water/moisture
Damaged RJ45 connector
Faulty patch-panel termination

Solution

Replace the patch cord first.

If structured cabling is involved, test:

Switch → patch cord → patch panel → permanent cable → I/O/keystone → patch cord → computer

Use a proper network cable tester.

8. Green Port LED During Cable Diagnostics

Diagnostic indication

GREEN

Meaning

No cable fault was detected / good cable connection according to the switch's boot diagnostic.

This does not necessarily guarantee perfect network performance.

Intermittent interference, excessive cable length, packet loss, poor-quality cable and marginal terminations may require additional testing.

9. Green Port LED During Normal Operation

On documented current revisions:

Solid green

A link is established at:

1000 Mbps / Gigabit Ethernet

Blinking green

Data is being transmitted or received at Gigabit speed.

This is normally not an error.

A rapidly blinking port LED can simply mean that the device is generating substantial network traffic.

10. Amber Port LED During Normal Operation

Solid amber

On current documented revisions:

10/100 Mbps link

Blinking amber

Traffic is being transmitted/received at 10/100 Mbps.

Again, amber during normal operation does not necessarily mean a fault.

11. Why Is My Gigabit Computer Showing Amber/100 Mbps?

If both the computer and switch support Gigabit Ethernet but the connection negotiates only at 100 Mbps, investigate the cabling first.

Gigabit Ethernet requires all four twisted pairs.

A cable with only some pairs correctly connected can potentially establish a 100 Mbps connection but fail to negotiate 1 Gbps.

Check

Replace the cable with known-good Cat5e/Cat6.
Check both RJ45 connectors.
Check all eight conductors.
Check patch-panel termination.
Check keystone.
Try another DGS-1024D port.
Check NIC Speed & Duplex.
Update NIC driver if appropriate.
Check whether the connected device actually supports Gigabit Ethernet.

For most modern devices, leave Speed & Duplex on:

Auto Negotiation

unless troubleshooting requires a controlled test.

12. Port LED Completely Off

Indication

Link/Act/Speed LED: OFF

Meaning

No active Ethernet link has been established.

Possible causes

Cable disconnected
Bad Ethernet cable
Connected computer powered off
NIC disabled
NIC failure
Bad switch port
Bad RJ45 connector
Patch-panel issue
Wall I/O problem

Troubleshooting

Perform a simple cross-test:

Same device + same cable → different switch port

Then:

Same device + different cable → original switch port

This separates cable/device faults from switch-port faults.

13. One Port Is Dead but Other 23 Ports Work

If only one port refuses to establish a link while the others operate normally, possible causes include:

Physically damaged RJ45 contacts
ESD/surge damage
Damaged Ethernet PHY
Solder/PCB failure
Dirt or corrosion
Previous electrical surge through Ethernet cable

Confirmation

Use:

known-good laptop
known-good Cat6 patch cord

Test the suspect port.

Then connect exactly the same laptop and cable to an adjacent port.

If the adjacent port works immediately but the suspect port consistently fails, the switch port itself may be defective.

14. Multiple Ports Suddenly Stop Working

Possible causes:

Main switch chipset problem
Internal power rail problem
PSU deterioration
Overheating
Surge/lightning damage
Network loop/broadcast storm
Uplink failure

First determine whether the ports are physically losing link or whether communication is failing despite the LEDs remaining active.

Those are different problems.

15. All LEDs Are On but There Is No Internet

The DGS-1024D does not itself provide Internet routing.

It is a Layer-2 unmanaged Ethernet switch.

Therefore, healthy switch LEDs do not prove that the Internet connection is working.

Check:

Computer → DGS-1024D → Router/Firewall → ISP

Test in this order:

Ping computer's own IP.
Ping default gateway.
Ping router.
Ping a public IP address.
Test DNS resolution.
Check DHCP.
Check WAN/ISP status.

If local communication works but websites do not open, the DGS-1024D may not be the problem.

16. Network Becomes Very Slow When DGS-1024D Is Connected

Potential causes include:

Network loop
Broadcast storm
Faulty uplink
Bad Ethernet cable
Duplex/speed negotiation issue
Excessive traffic
Malware generating network traffic
Another switch connected incorrectly

A classic accidental loop is:

Switch A Port 1 → Switch B Port 1

and simultaneously:

Switch A Port 2 → Switch B Port 2

Without appropriate loop-prevention mechanisms, redundant unmanaged connections can cause severe network disruption.

Symptoms may include:

Extremely slow LAN
High latency
Packet loss
Router becoming unresponsive
LEDs blinking extremely rapidly
Internet appearing/disappearing
All users reporting network problems simultaneously

Remove suspected redundant switch-to-switch connections and retest.

Some current DGS-1024D variants include DIP-switch functions such as Storm Control, but available functions depend on hardware revision.

17. Network Works but Disconnects Randomly

Possible causes:

Cabling

Loose RJ45 connector
Broken cable
Poor crimp
damaged patch panel

Power

Unstable AC
UPS problem
Internal PSU deterioration

Thermal

Blocked ventilation
excessive ambient temperature
dust buildup

Network

loop
upstream router failure
bad uplink
failing NIC

A useful test is to continuously ping:

switch-side gateway
router
another LAN computer
public IP

Compare exactly where packet loss begins.

18. Switch Works When Cold but Fails After Some Time

This pattern can indicate a temperature-sensitive hardware problem.

Possible causes:

Aging electrolytic capacitors
PSU component heating
voltage regulator overheating
failing semiconductor
poor solder joint
excessive ambient temperature

The DGS-1024D is fanless, so correct passive ventilation is important.

Do not block its ventilation openings.

19. Switch Restarts Randomly

Symptoms:

Power LED changes state
all links disappear simultaneously
LEDs perform startup sequence again
network returns after several seconds

This strongly points toward:

AC interruption
UPS fault
power cable fault
internal PSU fault
main PCB instability

Disconnect all LAN cables and perform the power-only test described earlier.

20. Port Works at 100 Mbps but Not 1000 Mbps

This is one of the most useful diagnostic symptoms.

If a connection consistently negotiates at 100 Mbps rather than 1 Gbps, check the Ethernet cable and termination carefully.

1000BASE-T requires all four cable pairs.

Test with a short, factory-made Cat6 patch cable directly between:

Computer → DGS-1024D

If it immediately negotiates at 1 Gbps, investigate the building cable, patch panel, keystone or existing patch leads.

21. Cable Diagnostic Says Good but Network Still Fails

The built-in diagnostic is useful but is not a complete network-certification test.

It primarily detects basic cable conditions such as open and short circuits.

It does not replace a professional cable certifier.

Also check:

cable length
signal quality
crosstalk
incorrect termination
NIC
IP configuration
DHCP
VLAN configuration elsewhere in network
router
DNS
firewall
upstream switch

22. Cable Length Limitation

D-Link documentation specifies the normal Ethernet segment maximum as approximately:

100 metres / 300 feet

The switch's built-in Cable Diagnostics does not determine cable length.

For long structured-cabling runs, use an appropriate cable tester/TDR or certification tool.

23. DGS-1024D Does Not Obtain an IP Address

Normally this is expected.

The DGS-1024D is an unmanaged switch.

You generally do not:

assign it a management IP
log into it through a browser
configure DHCP on it
configure VLANs through a web GUI
SSH into it
access a management console

Do not confuse it with a managed D-Link switch.

Your computers obtain their addresses from the router/DHCP server through the switch.

24. Cannot Find DGS-1024D Login Page

There normally isn't one.

If you enter an IP address in a browser expecting a DGS-1024D configuration page, nothing will appear because the standard DGS-1024D is an unmanaged switch.

Troubleshooting is therefore largely physical:

LEDs
cabling
connected devices
network topology
upstream equipment

25. EEE / Energy Efficient Ethernet Problems

Some DGS-1024D hardware revisions include Energy Efficient Ethernet functionality and/or DIP-switch options.

EEE reduces power consumption during periods of low traffic.

If you experience unusual compatibility problems with an older NIC or network appliance and your particular revision provides an EEE control, temporarily disabling EEE can be useful as an isolation test.

Do not assume every DGS-1024D revision has identical controls.

26. DIP Switch Settings

Current D-Link information lists front-panel DIP-switch functions on applicable versions including:

Energy Efficient Ethernet (EEE)
Flow Control
Port Isolation
Storm Control

The exact arrangement and supported features can vary by hardware revision.

Port Isolation

Useful where connected ports should be isolated from one another while retaining appropriate uplink connectivity.

Storm Control

Can help mitigate excessive broadcast/multicast/unknown traffic conditions.

Flow Control

Can improve reliability under heavy traffic by helping reduce packet loss.

EEE

Reduces energy consumption when network activity is low.

Before changing any DIP switch, obtain the manual matching the exact hardware revision.

27. How to Find DGS-1024D Hardware Revision

Look at the product label, normally on the bottom/rear of the unit.

Look for something similar to:

H/W Ver.: H1

or another revision designation.

Examples of DGS-1024D generations/revisions encountered in D-Link documentation include C, D/E, F, H, J and G-series variants depending on market.

This is important because the DGS-1024D has existed for many years and not every revision has identical hardware or front-panel behavior.

28. Quick DGS-1024D Diagnostic Table

Symptom	Likely meaning	Recommended action
Power solid green	Normal power	Check ports/network if problem remains
Power off	No power	Check AC, cable, UPS, PSU
Power green/off repeatedly	Probable restart/power loop	Remove all LAN cables; test PSU
Port green solid	1 Gbps link on applicable revision	Normal
Port green blinking	1 Gbps activity	Normal
Port amber solid	10/100 Mbps link during normal use	Check if Gigabit expected
Port amber blinking	10/100 Mbps activity	Usually normal
Amber during boot diagnostics	Cable open/short detected	Replace/test cable
Sequential port LEDs at startup	Cable diagnostics	Usually normal
Port completely off	No link	Check cable/device/port
One port always dead	Possible port hardware failure	Cross-test cable/device/port
All ports drop simultaneously	Power/uplink/internal problem	Check power and switch restart
Internet gone but LAN works	Router/WAN/DNS issue likely	Check upstream network
LAN becomes extremely slow	Loop/storm/congestion possible	Inspect topology
100 Mbps instead of 1 Gbps	Cabling/termination/device issue	Test known-good Cat5e/Cat6
Works then fails when hot	Thermal/PSU/component issue	Check ventilation/hardware
Boot LEDs continuously repeat	Switch repeatedly restarting	Check PSU/internal hardware

29. Recommended Troubleshooting Sequence

When a DGS-1024D is malfunctioning, use this order.

Step 1 – Check Power LED

Determine whether it is:

solid
off
cycling

Step 2 – Disconnect all Ethernet cables

Operate the switch with only AC power.

Step 3 – Observe startup

Watch whether Cable Diagnostics completes normally or starts over repeatedly.

Step 4 – Connect only one device

Use:

known-good computer
known-good Cat6 cable

Step 5 – Test every port

Move the same cable/device across ports.

Step 6 – Reconnect uplink

Connect only the router/uplink and one computer.

Step 7 – Add cables individually

Reconnect network cables one by one.

If the problem starts immediately after connecting a particular cable, investigate that cable/device/network segment.

Step 8 – Check for network loops

Pay particular attention to:

multiple links between switches
incorrectly patched wall sockets
unmanaged switches under desks
Wi-Fi bridges/extenders
IP cameras
accidental patch-panel loops

Step 9 – Check speed

Confirm whether expected Gigabit devices negotiate at 1000 Mbps.

Step 10 – Suspect hardware only after isolation

If the switch remains unstable with every Ethernet cable disconnected, concentrate on:

power source
internal PSU
main PCB
thermal/hardware failure

30. Special Case: Power LED Blinking Green and Going Off Repeatedly

Suppose the DGS-1024D behaves like this:

Green → Off → Green → Off → Green → Off

and the sequence continues indefinitely.

This should be treated as a probable power/restart fault, not a normal Ethernet activity indication.

Perform:

Test 1

Remove all 24 LAN cables.

Test 2

Disconnect power for several minutes.

Test 3

Connect only AC power.

Test 4

Try another known-good AC outlet and compatible power cord.

Test 5

Bypass the UPS/extension board temporarily.

If it continues to cycle with no Ethernet cables connected, internal hardware repair or replacement should be considered.

For an older switch, compare repair cost and reliability against replacement cost before undertaking component-level repair.

FAQ

Q1. Does the D-Link DGS-1024D have numeric error codes?

No. It is an unmanaged switch and primarily communicates operating and fault conditions through LEDs and boot-time Cable Diagnostics.

Q2. What does a solid green Power LED mean?

It means the switch is receiving power.

Q3. What does an off Power LED mean?

It means the switch is not currently showing powered status. Check the outlet, power cable, UPS and internal power supply.

Q4. Is a continuously blinking/cycling Power LED normal?

A brief startup sequence is normal. Continuous green → off → green cycling is not normal and can indicate repeated resets or unstable power.

Q5. What does a green port LED mean?

On current documented revisions, green indicates a 1000 Mbps link. Blinking indicates traffic at that speed.

Q6. What does an amber port LED mean?

During normal operation it can mean a 10/100 Mbps link. During boot-time Cable Diagnostics, amber can indicate an open or short circuit. Context is important.

Q7. Why does an amber LED not always mean an error?

Because the same LED is used for speed indication during normal operation and diagnostic information during startup.

Q8. What does sequential green blinking at startup mean?

It can be the built-in Cable Diagnostics scanning the Ethernet ports.

Q9. What cable faults can the switch detect?

D-Link documents detection of basic open-circuit and short-circuit faults during boot-time Cable Diagnostics.

Q10. Does Cable Diagnostics work continuously?

No. D-Link documentation describes it as a startup/boot-time function.

Q11. Can Cable Diagnostics determine cable length?

No. D-Link specifically states that it does not determine cable length.

Q12. What is the maximum Ethernet cable length?

For standard copper Ethernet in this application, D-Link specifies up to approximately 100 metres/300 feet.

Q13. Why is my Gigabit PC connecting at only 100 Mbps?

Check the cable, all eight conductors, RJ45 termination, patch panel, keystone and NIC. Test with a known-good Cat5e/Cat6 patch cable.

Q14. Why is one DGS-1024D port not working?

Cross-test the same computer and cable on another port. If every other port works, the individual port may be damaged.

Q15. Why are all the port LEDs blinking rapidly?

This can be normal under heavy traffic, but if the entire LAN is also slow, investigate a network loop or broadcast storm.

Q16. Why does the switch work but Internet does not?

The DGS-1024D is not the Internet router. Check the router, firewall, DHCP, DNS, gateway and ISP connection.

Q17. Can I log into the DGS-1024D?

The standard DGS-1024D is unmanaged and does not provide the type of browser management interface found on managed switches.

Q18. What IP address does the DGS-1024D use?

An unmanaged DGS-1024D normally does not require a management IP address.

Q19. Does the DGS-1024D have DHCP?

It does not function as your DHCP server. DHCP is normally provided by your router, firewall or server.

Q20. Why does the network stop when I connect another switch?

Check for an accidental network loop, particularly if two or more cables connect the same switches together without an appropriate loop-prevention design.

Q21. Why does the DGS-1024D repeatedly restart?

Possible causes include unstable AC power, a failing internal PSU, deteriorated capacitors, a voltage-regulation problem or a main PCB fault.

Q22. How can I tell whether the PSU is faulty?

Disconnect all Ethernet cables and test the switch on a verified power source. If the Power LED and startup sequence continue cycling, internal power/hardware failure becomes much more likely.

Q23. Should I open the DGS-1024D to repair it?

Only if you are qualified to work on mains-powered electronic equipment. Its internal power supply can expose dangerous voltage.

Q24. Can a bad Ethernet cable make a port amber?

Yes. During Cable Diagnostics an open/short can produce an amber diagnostic indication. During normal operation amber can instead simply represent a 10/100 Mbps connection.

Q25. Can a bad cable cause a Gigabit connection to fall back to 100 Mbps?

Yes. Gigabit Ethernet requires correct connectivity across all four twisted pairs, so cable or termination faults are an important cause to investigate.

Q26. Why do all connections disappear at the same time?

Check whether the Power LED also changes or the startup LEDs repeat. If so, suspect power/reset problems. If power remains stable, check the uplink/router and network topology.

Q27. Can overheating cause intermittent failure?

Yes. Ensure the switch has adequate ventilation and is not installed next to excessive heat sources or with blocked vents.

Q28. Does every DGS-1024D have exactly the same LEDs and features?

No. DGS-1024D has multiple hardware revisions. Always check the H/W version printed on the unit.

Q29. How do I distinguish cable failure from port failure?

Use a known-good device and known-good cable. Test the suspect port, then move the exact same cable/device to another port.

Q30. What should I do if Power cycles even with all 24 network cables removed?

Verify the AC outlet and power cord. If those are good and the switch still continuously restarts, internal PSU or PCB failure is likely and the unit should be professionally repaired or replaced.