On the causes of industrial-grade ONU energy waste

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 part of the interface is used, and the interface consumes energy when it is idle.

2. Increased energy consumption caused by chip module design.

When designing an industrial-grade ONU, modules are usually divided by function and integrated on the same chip, controlled by an enable terminal. When power is supplied, the entire module needs to be powered, and the 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 must also process it, resulting in a waste of resources.

4. Idle monitoring.

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

5. Waiting time.

The structure of the PON system determines the sharing of channel capacity between ONUs in the upstream direction. The PON system needs to adopt a certain arbitration mechanism to avoid conflicts. Each industrial-grade ONU allocates a time slot and buffers the frames received from users first. It can only be sent when the time slot arrives.