Reasons for ONU energy waste

1. The interface is idle.

ONU generally includes a variety of interfaces. Such as FE interface, GE interface, POTS interface, WIFI and IPlV interface, etc. In many cases, only part of the interface is used, and the interface consumes energy when it is idle.

2. The energy consumption caused by the chip module design increases.

In the design of ONU, modules are usually divided according to functions and integrated on the same chip, controlled by an enable terminal. When supplying power, the entire module needs to be powered, and unnecessary functional blocks are also consuming energy.

3. Processing of OLT data.

Due to the broadcast transmission characteristics of the OLT, when the OLT sends broadcast information or sends information to a certain ONU, other ONUs that do not receive the information also need to process it, resulting in a waste of resources.

4. Idle monitoring.

For TDM-PON, each ONU can only send upstream data in burst mode in the time slot authorized by the OLT, and the OLT forwards the downstream data in the form of broadcast frames, which makes all ONUs in a running state all the time. The ONU does not know when the user or the OLT sends data to itself, and the receiving and sending modules keep monitoring. When a certain ONU has no uplink or downlink data for a long time, the normal operation state will cause it to consume more energy.

5. Waiting time.

The structure of the PON system determines that the channel capacity should be shared among the ONUs in the upstream direction. The PON system needs to adopt an arbitration mechanism to avoid conflicts. Each ONU allocates a time slot, and buffers the frames received from the user first. Can only be sent when it arrives