Fast EtherHub 3500 System User’s Guide
Hardware Reference 5-15
Rear Panel Components
The rear panel is also similar for all versions. Figure 5.3 shows
the rear panel, which includes a primary power supply, a slot
for an optional secondary power supply module, and two
backplane connectors used for stacking up to 6 hubs. For easier
management and control of the hub, familiarize yourself with
the indicators, ports, and backplane connectors provided by the
hub.
Figure 5-3 Rear Panel

Power Supply Modules

The Fast EtherHub 3500 series supports both a primary and
backup power supply. The backup power supply is optional (Part
Number EM3550-PWR). When using two modules, the load is
shared equally between both, reducing the chance of failure, but
still providing backup power in case either module should fail. By
connecting the power supplies to separate AC circuits, you can
also provide backup in case an AC supply circuit should fail. This
ensures that there will be no interruption to network or agent
processes in case of a limited power failure. The power socket
accepts AC power from 100 to 240V (± 10%) at 50 to 60 Hz (±
3Hz). The hub is equipped with a universal full-range power
source.