Allied Telesis AT-2973T/4, AT-2973SX manual Lso

AT-2973SX, AT-2973T, and AT-2973T/4 NetExtreme II Family Adapters Installation and User’s Guide

Table 9. Diagnostic Tests (Continued)

	Test	Description
Number	Name
D2	PHY Loopback	Enables PHY loopback mode in the adapter
		and transmits 5000 Layer 2 packets of various
		sizes. As the packets are received 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 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 by Broadcom
		NetXtreme II User Diagnostics, they are
		checked for errors. The adapter should not be
		connected to a network

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