The reasons for energy waste in industrial grade ONUs

1. The interface is idle.

Industrial grade ONUs generally include multiple interfaces, such as FE interface, GE interface, POTS interface, WIFI and IPlV interface, etc. In many cases, only a portion of the interfaces are used, and while the interfaces are idle, they are also consuming energy.

2. The increase in energy consumption caused by chip module design.

In industrial grade ONU design, modules are usually divided by function and integrated on the same chip, controlled by an enabling end. When powered, the entire module needs to be powered, and unnecessary functional blocks also consume energy.

3. Processing of OLT data.

Due to the broadcast transmission characteristics of OLT, when OLT sends broadcast information or sends information to a certain ONU, other non receiving ONUs also need to process it, resulting in resource waste.

4. Idle listening.

For TDM-PON, each industrial grade ONU can only send uplink data in burst mode during the time slot authorized by OLT. OLT forwards downlink data in the form of broadcast frames, which requires all ONUs to be in operation at all times. Industrial grade ONUs do not know when the user or OLT will send data to them, and the receiving and sending modules remain in a listening state. When a certain 0NU has no uplink or downlink data for a long time, its normal operating state will consume more energy.

5. Waiting time.

The structure of the PON system determines that channel capacity needs to be shared between ONUs in the upstream direction. The PON system needs to adopt some arbitration mechanism to avoid conflicts. Each industrial level ONU is allocated a time slot, and the frames received from the user are cached first, and can only be sent when the time slot arrives.