Allied Telesis AT-S39 - Manual (Page 56)

Section II: Local and Telnet Management
56
Configuring BALUN Cable Detection
You can configure the AT-S39 software to detect loopback cables for all
10/100/1000 copper ports. When a loopback cable is detected, the port
is set to MANUAL/10/HDX/MDIX and a message is displayed on the
console. When the loopback cable is replaced with a good cable, the
original port settings are restored.
To configure the switch to enable or disable balun cable detection,
perform the following procedure:
1. From the Main Menu, type 5 to select System Config Menu.
2. From the System Configuration Menu, type 7 to select BALUN Cable
Detection. The following prompt is displayed:
Enter BALUN Cable Detection Status (E-Enabled, D-Disabled) :
3. Select E to enable cable detection or select D to disable cable
detection.