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Recommended Powering Architecture for ONU Premises
Local powering is less effective than centralized powering in maintaining and operating. However, centralized powering has higher power loss and may lower or remove some of the main advantages of an all-passive optical network. For this reason, we suggest to use local powering architecture for ONU/ONT networks and other FTTHs as shown in Figure 1.
Local architecture for ONU network
As illustrated, the ONT (ONU) is powered by a DC UPS, which is located in local premises not far than 100 feet (30 meters) away. The UPS is powered from a commercial 120V or 220V power connection and dispose backup power source (rechargable batteries), while providing low voltage DC power to ONU
The UPS will alert the customer in case of:
- AC Power Out
- Low Battery
- Missing Battery
- Battery replacement required
These alerts help customer to ensure uninterruptible powering of ONI/ONT. During power blackouts, a power-down scheme is used to ensure longer life for voice services by disabling nonessential services.
The battery life and capacity is enhanced by installation inside customers’ home in a weather-controlled environment.
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