3Com NETBuilder II, Installing Instruction, Page: 18 / 82

1-8 C
HAPTER
1: NETB
UILDER
II 4-S
LOT
B
RIDGE
/R
OUTER
POWER and STATUS LEDs
Below and to the left of the LCD control panel are two LEDs marked POWER
and STATUS. The POWER LED indicates whether the system is on or off and is
the same as the POWER LED on the main processor module.
If you are using a DPE module, the STATUS LED on the chassis is the same as
the POWER/FAULT LED on the DPE module. Refer to the DPE module guide for
more information about this LED.
If you are using a CEC 20 module, the STATUS LED on the chassis is the same
as the STATUS LED on the CEC 20 module. Refer to the CEC 20 module guide
for more information about this LED.
Back Panel The 4-Slot chassis has four I/O slots and one main processor slot.
Figure 1-9 4-Slot Chassis I/O Module Slot Numbering Sequence
WARNING: Remove the filler panel only from I/O slots that will house an I/O
module. All unused I/O slots require the filler panels to maintain proper cooling
of the unit and regulatory compliance. Failure to cover open slots can result in
overheating of the NETBuilder II system and will invalidate the warranty.
Floppy Disk Drive The 4-Slot chassis includes a 3.5 inch, 135 tracks per inch (TPI), 4 MB floppy
disk drive that supports 1.4 MB and 2.8 MB DOS-formatted floppies. The drive
is located on the right side of the front panel.
The DPE module does not support the floppy disk drive.
Press the eject button on the disk drive front panel to eject diskettes. The LED
on the front panel lights when a floppy diskette is being formatted, read, or
written. Do not attempt to eject the diskette when the LED is lit.
For information on replacing the floppy disk drive, see page 1-13.
Backplane The backplane consists of a bus that is mounted vertically against the back of
the card cage. When installed, the modules rest inside the card cage.
Connectors on the backplane engage connectors on the edges of the modules.
The backplane has a peak data rate of 800 Mbps.
The backplane allows you to hot-swap an I/O module, which means that you
can install, or remove and reinstall, an I/O module without turning off power to
the chassis.
1
2
4
3
O I
Slot 0
Slot 1
Slot 2
Slot 3
Slot 4
Main processor
module slot
I/O module slots