What are the key performance indicators for ONU quality and reliability in FTTx?

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If you are involved in FTTx deployment, you know how important it is to ensure the quality and reliability of the optical network units (ONUs) that connect the end users to the fiber network. ONUs are the devices that convert optical signals to electrical signals and vice versa, and they are subject to various environmental and operational conditions that can affect their performance. In this article, we will discuss some of the key performance indicators (KPIs) that can help you monitor and evaluate the ONU quality and reliability in FTTx.

本文章的要点总结

Monitor optical power:

Keeping tabs on the optical power of your ONUs is like giving them a regular health check. By using tools like an Optical Time Domain Reflectometer, you can spot issues before they worsen, ensuring your customers enjoy a reliable service.
Assess ONU temperature:

ONUs are sensitive to temperature, so monitoring it can help you prevent damage. With embedded sensors or indicators, you can maintain the right conditions for optimal performance and extend the life of your network units.

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1 ONU availability

One of the most basic KPIs for ONU quality and reliability is the availability, which measures the percentage of time that the ONU is operational and able to communicate with the optical line terminal (OLT) at the central office. A high availability indicates that the ONU is functioning properly and has a low failure rate. Availability can be calculated by dividing the total uptime by the total observation time, and it can be affected by factors such as power supply, fiber connection, hardware defects, software bugs, or external interference.

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Ahmed Akeed

Signaling QC Engineer CREC – AVIC INTL Consortium 10th of Ramadan Railway Maintenance Project
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- ONU temperature . - no. of ports used . - received power from OLT . - hardware issues . - quality of ONU . - bandwidth .

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yusuf lukman

CEO of Equilateral Technology Nigeria Limited
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Quality of patchcord use for patching optical power from OLT or nearby FAT box. Avoid dust to ONU fiber port. Ensure your splicing is well managed.

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2 ONU optical power

Another important KPI for ONU quality and reliability is the optical power, which measures the intensity of the light transmitted and received by the ONU. Optical power is measured in decibels relative to one milliwatt (dBm), and it can indicate the health of the ONU and the fiber link. A low optical power can result from fiber attenuation, connector loss, splitter loss, or ONU degradation, and it can cause signal distortion, data errors, or link failure. Optical power can be monitored by using the optical time domain reflectometer (OTDR) or the OLT management system.

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Zac Cronauer

Vice President of Training and Professional Services | Fiber Optic Networks
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Monitoring on the ONU optical power is critical to understanding the health of your network. Understanding how many ONU’s are performing in the “Green” or designed light specification is important, how many are out of specification and why, is what you should be doing as a network provider. Providing the best customer experience to your consumer is the most important part of being an ISP and monitoring these KPI’s are critical for that.

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3 ONU bit error rate

A more advanced KPI for ONU quality and reliability is the bit error rate (BER), which measures the ratio of erroneous bits to the total number of bits transmitted and received by the ONU. BER is a direct indicator of the data quality and integrity of the ONU and the fiber link, and it can be affected by factors such as optical power, noise, interference, modulation, or multiplexing. A high BER can result in data loss, corruption, or degradation, and it can impact the user experience and satisfaction. BER can be measured by using test equipment or software tools that generate and analyze data patterns.

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4 ONU temperature

A less obvious but still relevant KPI for ONU quality and reliability is the temperature, which measures the internal or external heat level of the ONU. Temperature can affect the ONU performance and lifespan, as well as the fiber link stability and safety. A high temperature can cause thermal stress, optical drift, component damage, or fire hazard, while a low temperature can cause condensation, corrosion, or cracking. Temperature can be monitored by using sensors or indicators embedded in the ONU or the OLT management system.

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5 ONU energy consumption

A final KPI for ONU quality and reliability is the energy consumption, which measures the amount of electricity used by the ONU. Energy consumption can reflect the ONU efficiency and sustainability, as well as the operational cost and environmental impact of the FTTx network. A low energy consumption can indicate that the ONU is optimized for power saving, load balancing, or sleep mode, while a high energy consumption can indicate that the ONU is overworked, outdated, or faulty. Energy consumption can be monitored by using meters or calculators integrated in the ONU or the OLT management system.

By using these KPIs, you can better understand and improve the ONU quality and reliability in FTTx, and ensure the optimal performance and user satisfaction of your fiber network.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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What are the key performance indicators for ONU quality and reliability in FTTx?

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1 ONU availability

2 ONU optical power

3 ONU bit error rate

4 ONU temperature

5 ONU energy consumption

6 Here’s what else to consider

Fiber to the x (FTTx)

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