3com 100 TX Manual Do Utilizador

If network management is present, an external switch on the hub’s rear panel 
allows you to power-up the hub with the ports disabled. The power-up 
disabled option switch is located between the expansion connectors and the 
DC input connector, as shown in Figure 3-12.

Figure 3-12   Power-Up Disabled Option Switch

Table 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 a 
port where a faulty device or other problem exists. This prevents the disabled 
port from receiving any data when the hub is powered-up. Conversely, you 
can enable ports if you want them to receive data. 

tion

A

–12

0.2

DC INPUT

E

D

Power-up disabled
option switch

Table 3-4   Settings on Power-Up Disabled Option Switch

D (disabled)

If network management is present, you can enable specific ports 
after the hub has been powered-up.

If network management is not present, all ports remain disabled 
after the hub has been powered-up.

E (enabled)

This is the default setting. All ports are enabled after the hub has 
been powered-up, whether or not network management is present. 
If network management is present, individual ports can then be 
disabled after the hub has been powered-up.