Intel EtherExpress PRO/100+, Руководство по установке

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12 Intel EtherExpress PRO/100+ TX PCI LAN Controller User’s Guide
Select Duplex Mode (Optional)
Duplexing is a performance option that lets you choose how the ethernet
controller sends and receives data packets over the network. The ethernet
controller can operate at full duplex only when connected to a full duplex
10BASE-T, 100BASE-TX switch, or another full duplex adapter.
•
Auto (requires a full duplex adapter or switch with auto-
negotiation capability). The controller negotiates with the switch to
send and receive packets at the highest rate. This is the default
setting. If the switch does not provide auto-negotiation, the
controller runs at half duplex.
•
Full duplex (requires a full duplex switch or adapter). The
controller can send and receive packets at the same time. This
mode can increase controller performance capability. If the full
duplex switch provides auto-negotiation, the controller runs at full
duplex. If the full duplex switch does not provide auto-negotiation,
you need to set the controller duplex mode manually (see
following paragraphs), because it defaults to half duplex.
•
Half duplex. The controller performs one operation at a time; it
either sends or receives.
Manually Configuring for Full Duplex
If your switch supports auto-negotiation with the N-way standard, duplex
configuration is automatic and no action is required on your part. However,
few switches in the current installed base support auto-negotiation. Check
with your network system administrator to verify whether your switch
supports this feature. Most installations will require manual configuration
to change to full duplex.
Configuration is specific to the driver you’re loading for your network
operating system (NOS).
To set up the duplex mode, refer to the section below that corresponds to
your operating system.
Note:
If your controller is running
at 100 Mbps and half
duplex, your potential
bandwidth is higher than if
you run it at 10 Mbps and
full duplex.
Note:
Controller performance
may suffer or your controller
may not operate if your
switch doesn’t support full
duplex and you configure
the controller to full duplex.
Make sure you always set
the speed when you
configure duplex.
ENet2.book Page 12 Monday, May 4, 1998 9:53 AM