D-Link DXE-820T User Manual
Group D: Ethernet Traffic Tests
D1
MAC Loopback
Enables MAC loopback mode in the adapter and transmits 5000 Layer 2
packets of various sizes. As the packets are received back by Broadcom
NetXtreme II User Diagnostics, they are checked for errors. Packets are
returned through the MAC receive path and never reach the PHY. The adapter
should not be connected to a network.
D2
PHY Loopback
Enables PHY loopback mode in the adapter and transmits 5000 Layer 2 packets
of various sizes. As the packets are received back by Broadcom NetXtreme II
User Diagnostics, they are checked for errors. Packets are returned through the
PHY receive path and never reach the wire. The adapter should not be
connected to a network.
D4
LSO
Verifies the functionality of the adapter's Large Send Offload (LSO) support by
enabling MAC loopback mode and transmitting large TCP packets. As the
packets are received back by Broadcom NetXtreme II User Diagnostics, they are
checked for proper segmentation (according to the selected MSS size) and any
other errors. The adapter should not be connected to a network.
D5
EMAC Statistics
Verifies that the basic statistics information maintained by the chip is correct
by enabling MAC loopback mode and sending Layer 2 packets of various sizes.
The adapter should not be connected to a network.
D6
RPC
Verifies the Receive Path Catch-up (RPC) block by sending packets to different
transmit chains. The packets traverse the RPC logic (though not the entire MAC
block) and return to the receive buffers as received packets. This is another
loopback path that is used by Layer 4 and Layer 5 traffic within the MAC block.
As packets are received back by Broadcom NetXtreme II User Diagnostics, they
are checked for errors. The adapter should not be connected to a network.