3com 8807 사용자 가이드

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.

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.

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.

Table 71   Setting speed on the Ethernet port

Set Ethernet port speed 

speed { 10 | 100 | 1000 | 10000 | auto } 

Restore the default speed on Ethernet port 

Table 72   Setting the type of the cable connected to the Ethernet port

Set the type of the cable connected to the 
Ethernet port 

mdi { across | auto | normal } 

Restore the default type of the cable 
connected to the Ethernet port