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ASUS P2B-L/P2B-S/P2B-LS User’s Manual 69
VII. NETWORK
Duplex Mode
VII. NETWORK INTERFACE
Select Duplex Mode (optional)
Duplexing is a performance option that lets you choose how the network interface or
adapter sends and receives data packets over the network. This motherboard’s network
interface can operate at full duplex only when connected to a full duplex 10BASE-T,
100BASE-TX switching hub, or another full duplex network interface or adapter. To
summarize:
• Auto (requires a full duplex network interface or adapter or switching hub
with auto-negotiation capability). The network interface or adapter negotiates
with the hub to send and receive packets at the highest rate. This is the default
setting. If the hub does not provide auto-negotiation, the network interface or adapter
runs at half duplex.
• Full duplex (requires a full duplex switching hub or network interface or
adapter). The network interface or adapter can send and receive packets at the
same time. This mode can increase network interface or adapter performance ca-
pability. If the full duplex hub provides auto-negotiation, the network interface or
adapter runs at full duplex. If the full duplex hub does not provide auto-negotia-
tion, you need to set the network interface or adapter duplex mode manually (see
following paragraphs)
• Half duplex. The network interface or adapter performs one operation at a time; it
either sends or receives.
NOTE: If your hub is running at 100 Mbps and half duplex, your potential bandwidth
is higher than if you run at 10 Mbps and full duplex.
Manually Configuring for Full Duplex
If your switch supports auto-negotiation with the N-way standard, duplex configura-
tion 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 ad-
ministrator to verify. Most installations will require manual configuration to change to
full duplex.
Configuration is specific to the driver you’re loading for your network operating sys-
tem (NOS), as shown in the following paragraphs. To set up the duplex mode, refer to
the section below that corresponds to your operating system. The performance of the
network interface or adapter may suffer or your network interface or adapter may not
operate if your hub does not support full duplex and you configure the network inter-
face or adapter to full duplex. Leave the network interface or adapter on half duplex if
you are not sure what type of hub you are connected to.
DOS ODI, NDIS 2.01 Clients
Edit the NET.CFG or PROTOCOL.INI file. Add keywords to Link Driver section:
FORCEDUPLEX 2
SPEED 100 (or 10 if 10BASE-T)