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22 Sep 2026

September 21, 2026

Fiber Media Converter Lights On but No Network?

Fiber media converter lights on but no network describes a common fault pattern: several green LEDs appear, yet the far endpoint s...

luleey

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User Operation Guide

21 Sep 2026

September 20, 2026

How to Test an SFP Port with a Fiber Loopback

To test an SFP port with a fiber loopback, connect the optical transmitter back to the receiver through a correctly matched passiv...

luleey

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Data Transmission & Conversion

20 Sep 2026

September 19, 2026

Can You Use a Single-Mode SFP with Multimode Fiber？

A single-mode SFP with multimode fiber is not a normal plug-and-play combination. The connector may fit, and a short bench link ma...

luleey

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Data Transmission & Conversion

19 Sep 2026

September 18, 2026

PoE over Fiber: How to Power Remote Cameras and APs

PoE over fiber usually means carrying Ethernet data over a fiber link, then supplying Power over Ethernet on copper cable at the r...

luleey

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Problem Cases

18 Sep 2026

September 16, 2026

10GbE Slow File Transfers? Test with iperf3 First

Troubleshooting 10GbE slow file transfers starts with separating three numbers: the port’s link speed, the throughput between two ...

luleey

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Problem Cases

17 Sep 2026

September 17, 2026

SFP CRC Errors with Normal RX Power? What to Check

SFP CRC errors can rise while the link stays up and the reported RX power looks normal. That is not a contradiction. RX power desc...

luleey

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Network Cabling

17 Sep 2026

September 15, 2026

Can You Splice G.652D to G.657A2 Fiber?

Yes, you can normally splice G.652D to G.657A2 fiber. ITU-T defines G.657 category A fibers as compliant with G.652.D and as havin...

luleey

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Network Maintenance

16 Sep 2026

September 15, 2026

SFP TX Bias Current High: Causes and Fixes

An SFP TX bias current high warning means that the transmitter laser is being driven above the module manufacturer’s programmed wa...

luleey

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Network Maintenance

15 Sep 2026

September 15, 2026

Fiber Loss Higher at 1550nm Than 1310nm: Why?

If you find fiber loss higher at 1550nm than 1310nm, a bend or cable stress is one of the first things to investigate. Longer wave...

luleey

0

Network Maintenance

15 Sep 2026

September 15, 2026

Can a Regular Optical Power Meter Test a Live PON?

A regular optical power meter can test a live PON only in limited ways. It may measure a separated or disconnected downstream sign...

luleey

0

Network Maintenance

15 Sep 2026

September 15, 2026

XGS-PON ONU Not Registering? Check O1–O7 States

XGS-PON ONU Not Registering? Check O1–O7 States If your XGS-PON ONU is not registering, the most useful first clue is the highe...

luleey

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Access Network

10 Sep 2026

September 15, 2026

2.5G GPON ONU Speed: Why You May Not Get 2.5Gbps

2.5G GPON ONU speed is often misunderstood. A 2.5G interface can remove the Gigabit Ethernet bottleneck between an ONU and your ro...

Fiber Media Converter Lights On but No Network?

How to Test an SFP Port with a Fiber Loopback

Can You Use a Single-Mode SFP with Multimode Fiber？

PoE over Fiber: How to Power Remote Cameras and APs

10GbE Slow File Transfers? Test with iperf3 First

SFP CRC Errors with Normal RX Power? What to Check

Can You Splice G.652D to G.657A2 Fiber?

SFP TX Bias Current High: Causes and Fixes

Fiber Loss Higher at 1550nm Than 1310nm: Why?

Can a Regular Optical Power Meter Test a Live PON?

XGS-PON ONU Not Registering? Check O1–O7 States

2.5G GPON ONU Speed: Why You May Not Get 2.5Gbps

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