3Com 100 TX User Manual

Power-Up Disabled Option Switch 3-13Power-UpDisabled OptionSwitchIf network management is present, an external switch on the hub’s rear panelallows you to power-up the hub with the ports disabled. The power-updisabled option switch is located between the expansion connectors and theDC input connector, as shown in Figure 3-12.This feature cannot be fully implemented unless a network managementdevice (such as the LinkBuilder FMS 100 Management Unit) is connected tothe hub stack. If no network management is present, leave the power-updisabled option switch in the enabled position (set to E).Figure 3-12 Power-Up Disabled Option SwitchTable 3-4 describes the functioning of the power-up disabled option switch.You can use this option for security purposes. For example, you can disable aport where a faulty device or other problem exists. This prevents the disabledport from receiving any data when the hub is powered-up. Conversely, youcan enable ports if you want them to receive data.tionA–120.2UPDOWNEXPADC INPUTEDPower-up disabledoption switchTable 3-4 Settings on Power-Up Disabled Option SwitchSetting ResultD (disabled) If network management is present, you can enable specific portsafter the hub has been powered-up.If network management is not present, all ports remain disabledafter the hub has been powered-up.E (enabled) This is the default setting. All ports are enabled after the hub hasbeen powered-up, whether or not network management is present.If network management is present, individual ports can then bedisabled after the hub has been powered-up.