SMC Networks SMC EZ Card 1000 SMC9452TX - Manual (Page 40)

C
ONFIGURING THE
N
ETWORK
C
ARD
3-2
Media Type
In this field auto-negotiation can be enabled, or the card’s link
speed and duplex mode can be selected. If auto-negotiation is
enabled, the card will match settings with its link partner. If the link
partner has a fixed configuration, the link speed will be sensed and
the mode will default to half duplex. If the link partner is configured
to full duplex, the card will not connect correctly, resulting in high
error rates and inefficient communication. Therefore,
auto-negotiation should be disabled when connecting to a device
with a fixed configuration. The default for this field is “Auto-
Negotiate”.
Offload Checksum
The checksum of received packets is recomputed to check for
corruption of data. A checksum is inserted into transmitted packets.
Enabling Offload Checksum off-loads this function from the CPU to
the card. The default is Tx Checksum.
Packet Size (Maximum)
The card can be configured to use Jumbo Frames. This increases the
maximum Ethernet frame size to greater than 1514 bytes. Using
Jumbo Frames greatly reduces packet processing overhead and can
boost throughput by up to 300% for bulk data transfers.
Note: To use Jumbo Frames, both communicating computers
must have network cards that support this feature. Also, at
full duplex, all switches in the network between the two
end computers must be able to accept the extended frame
size. With half-duplex connections, all devices in the
collision domain need to support Jumbo Frames.