3Com 3C780 User Guide - Page 54

Removing Modules

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2-14 Installing the Hub There is no power switch on the hub. Power to the hub is provided by connecting the power cord to the hub and to an ac outlet. NOTE: The hub allows "power-on insertion," which means that you do not have to unplug the power cord for module insertion or removal. When you replace a module, reset the hub by pressing the RESET button or entering the reset command. Resetting the hub reinitializes the hub and causes the system to run its power-on self-tests (POST). CAUTION: When the hub is reinitialized, any devices connected to the hub are momentarily disconnected. This could result in serious data loss unless you take preventative measures before changing installed modules. To avoid potential problems, enter the disconnect command before activating the reset function. After you install the management module and one or more media modules, one or two empty slots may remain in the base unit. Insert a blanking plate into each of these empty slots. This keeps objects from falling into the hub and prevents RF emissions from an open slot. Removing Modules To remove modules from the hub, follow these steps: CAUTION: Observe the same precautions outlined above regarding discharge of static electricity and potential loss of data. 1. Disconnect all cables connected to the module that you want to remove. You do not have to unplug the hub from its power source. 2. Enter the disconnect command. This disconnects the hub from the ring. 3. Remove all jewelry from your hands and wrists.

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2-14
Installing the Hub
There is no power switch on the hub.
Power to the hub is provided by
connecting the power cord to the hub and to an ac outlet.
NOTE:
The hub allows “power-on insertion,” which means that you do not
have to unplug the power cord for module insertion or removal.
When you
replace a module, reset the hub by pressing the RESET button or entering the
reset
command.
Resetting the hub reinitializes the hub and causes the system to
run its power-on self-tests (POST).
CAUTION:
When the hub is reinitialized, any devices connected to the hub are
momentarily disconnected.
This could result in serious data loss unless you
take preventative measures before changing installed modules.
To avoid
potential problems, enter the disconnect command before activating the reset
function.
After you install the management module and one or more media modules, one
or two empty slots may remain in the base unit.
Insert a blanking plate into each
of these empty slots.
This keeps objects from falling into the hub and prevents
RF emissions from an open slot.
Removing Modules
To remove modules from the hub, follow these steps:
CAUTION:
Observe the same precautions outlined above regarding discharge
of static electricity and potential loss of data.
1.
Disconnect all cables connected to the module that you want to
remove.
You do not have to unplug the hub from its power source.
2.
Enter the
disconnect
command.
This disconnects the hub from the ring.
3.
Remove all jewelry from your hands and wrists.