3Com 8807 Configuration Manual page 91

Setting Speed on the
Ethernet Port
Setting the Cable Type
for the Ethernet Port
Enabling/Disabling Flow
Control for the Ethernet
Port
You can use the following command to set the speed on the Ethernet port. If the
speed is set to auto-negotiation mode, the local and peer ports will automatically
negotiate about the port speed.
Perform the following configuration in Ethernet port view.
Table 71 Setting speed on the Ethernet port
Operation
Set Ethernet port speed
Restore the default speed on Ethernet port
The optional parameters of this command are determined by the port types and
duplex modes. For example, the 10/100/1000 electrical ports support three
optional parameters including 10 Mbps, 100 Mbps, and 1000 Mbps. You can
select proper port speed as you require. But when the duplex mode is changed
into half duplex mode, the port speed can be set to 1000 Mbps or auto.
Note that, the 10/100 Mbps electrical Ethernet port can operate at 10 Mbps, 100
Mbps and in auto mode. You can set it accordingly. The 10/100/1000Mbps
electrical Ethernet port can operate at 10 Mbps, 100 Mbps, or 1000 Mbps as per
different requirements. However in half duplex mode, the port cannot operate at
1000 Mbps or in auto mode. The 100 Mbps optical Ethernet port supports 100
Mbps; the 1000 Mbps optical Ethernet port supports 1000 Mbps; the 10 Gbps
optical Ethernet port supports 10 Gbps without user intervention.
By default, the speed of the port is in auto mode.
The Ethernet port supports the straight-through and cross-over network cables.
The following command can be used for configuring the cable type.
Perform the following configuration in Ethernet port view.
Table 72 Setting the type of the cable connected to the Ethernet port
Operation
Set the type of the cable connected to the
Ethernet port
Restore the default type of the cable
connected to the Ethernet port
Note that, the settings only take effect on 10/100 Mbps and 10/100/1000 Mbps
electrical ports.
By default, the cable type is auto (auto-recognized). That is, the system can
automatically recognize the type of cable connecting to the port.
After enabling flow control in both the local and the peer switch, if congestion
occurs in the local switch, the switch will inform its peer to pause packet sending.
Once the peer switch receives this message, it will pause packet sending, and vice
versa. In this way, packet loss is reduced effectively. The flow control function of
the Ethernet port can be enabled or disabled through the following command.
Ethernet Port Configuration
Command
speed { 10 | 100 | 1000 | 10000 | auto }
undo speed
Command
mdi { across | auto | normal }
undo mdi
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