Allied Telesis AT-2972T/2 - Manual (Page 28)

Chapter 2: Broadcom Advanced Control Suite 2 (BACS 2) Applications
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property is set to Enable. To disable Ethernet@Wirespeed, change the
setting to Disable.
Note
This parameter is available only for copper devices and is not
displayed for the AT-29xx Series Gigabit Ethernet adapters.
– Disable. Disables Ethernet@Wirespeed.
– Enable (default). Enables Ethernet@Wirespeed
ˆ Flow Control. The Flow Control property enables or disables the
receipt or transmission of PAUSE frames. PAUSE frames enable the
network adapter and a switch to control the transmit rate. The side that
is receiving the PAUSE frame momentarily stops transmitting.
– Auto (default). PAUSE frame receipt and transmission are
optimized.
– Disable. PAUSE frame receipt and transmission are disabled.
– Rx PAUSE. PAUSE frame receipt is enabled.
– Rx/Tx PAUSE. PAUSE frame receipt and transmission are
enabled.
– Tx PAUSE. PAUSE frame transmission is enabled.
ˆ LSO & Jumbo Frames. The Jumbo property allows the network
adapter to transmit and receive oversized Ethernet frames that are
greater than 1514 bytes, but less than 9000 bytes in length. This
property requires the presence of a switch that is able to process
Jumbo frames. If Jumbo frames is not one of the properties listed for a
selected adapter, the feature is not supported. BCM5721- and
BCM5751-based adapters do not support Jumbo frames.
Frame size is set at 1500 bytes by default when you select the LSO
Enabled,Jumbo Off option.
Note
Jumbo frames and Large Send Offload (LSO) are mutually-
exclusive properties.
Normally the TCP segmentation is done by the protocol stack. When
you enable the LSO property, the TCP segmentation can be done by
the network adapter.
– Both Disabled. LSO and Jumbo frames are both disabled.
– LSO Enabled, Jumbo Off (default). LSO is enabled and Jumbo