# Ethernet features

Tab QCS6490
Tab IQ-9075
Tab IQ-8275
Tab IQ-615

- *class* tabincludedirective

    - ## Energy efficient Ethernet

EEE is an optional operational mode that helps in reducing the
consumption of power while transmitting and receiving data. When there
is no data to transmit or receive, this feature allows the MAC sublayer
and a family of physical layers (PHY) to operate in the low-power idle
(LPI) mode.

During link negotiation, the link partners learn about the capabilities
and features, such as EEE, supported by the remote entity. Based on the
supported capabilities, features, and data transfer state, the MAC
determines whether the system should enter or exit the LPI mode and
communicates this information to the PHY.

The EEE feature specifies the capabilities and negotiation methods that
the link partners can use to:

- Determine whether EEE is supported.
- Select the set of parameters that are common to both the devices.

Note

EEE feature is supported only on QEP8121 PHY.

## Next steps

> 
> 
> - [Bring up Ethernet](https://docs.qualcomm.com/doc/80-70020-26/topic/bring_up-ethernet.html#bring-up-ethernet)
> - [Configure EEE](https://docs.qualcomm.com/doc/80-70020-26/topic/configure-ethernet-features.html#configure-eee)

- *class* tabincludedirective

    - Basic Ethernet features such as interface enumeration and data path are supported on IQ-9075.

- *class* tabincludedirective

    - Basic Ethernet features such as interface enumeration and data path are supported on IQ-8275.

- *class* tabincludedirective

    - ## Precision time protocol

Precision time protocol (PTP) is a network protocol used to synchronize clocks throughout a device. It’s defined in the IEEE 1588 standard and is especially useful in systems that require very precise time coordination, such as industrial automation.

## TCP segmentation offload

TCP segmentation offload (TSO) is a network optimization feature that enhances system performance by offloading the task of segmenting large data blocks into smaller TCP packets from the CPU to the network interface card (NIC).

The operating system breaks down large chunks of data into smaller segments that fit within the maximum transmission unit (MTU) of the network. With TSO enabled, the OS can hand off a large data buffer to the NIC, which then handles the segmentation process. This reduces CPU overhead, allowing it to focus on other tasks, and improves overall throughput.

## Next steps

> 
> 
> - [Configure PTP](https://docs.qualcomm.com/doc/80-70020-26/topic/configure-ethernet-features.html#configure-ptp)
> - [Configure TSO](https://docs.qualcomm.com/doc/80-70020-26/topic/configure-ethernet-features.html#configure-tso)

Last Published: Oct 10, 2025

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