Fan Assemblies; Backplane; Intake And Exhaust Vents; Maintenance And Repair - 3Com NETBuilder II Installing Instruction

3-12 C 3: NETB
HAPTER UILDER

Fan Assemblies

Backplane

Intake and
Exhaust Vents
Maintenance and
Repair

Preventive Maintenance

II 8-S E B /R
LOT XTENDED RIDGE OUTER
The international CEE-22 AC power receptacle is approved for 10 amp
operation. The connector has three prongs with chassis ground on the middle
prong. All systems are shipped with power cords; if your power cord does not
match your requirements, contact your network supplier for assistance.
For information on replacing or installing the power supply, see page 3-13.
Two fan assemblies are located in the chassis immediately above the module
slots. For information on removing and replacing the fan assemblies, refer to
"Replacing the Fan Assemblies" on page 3-19.
The backplane consists of a bus that is mounted vertically against the back of
the card cage. When installed, modules rest inside the card cage. Connectors
secured on the backplane engage connectors secured to 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 the power
off to the chassis. For details on installing and replacing the backplane, see
page 3-17.
Intake vents are located on the lower right side panel, and exhaust vents are
located on the back panel of the chassis. Make sure that these vents are not
blocked or covered when you install your unit.
CAUTION: Overheating due to improper ventilation can result in system failure
and may void the hardware warranty.
This section includes maintenance and repair information for the Extended
chassis.
3Com recommends the following procedures for preventive maintenance:
Observe the environmental requirements listed in Appendix A. Temperatures
outside the recommended range can impair reliability and cause diskette
access errors.
Observe ESD guidelines whenever handling modules.
Keep the area around the NETBuilder II system clean. Avoid accumulated
dust, especially around the air intake vents.
If the system fails, an immediate memory dump may help diagnose the
problem. Contact 3Com Technical Support for memory dump information.