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Guidelines for Network Configuration 15
DC Power Socket The EPS has a 12-pin DC power socket for use only with an optional –24
VDC uninterruptible power supply (UPS). See the documentation that
comes with your UPS.
The EPS normally draws power from its internal power supplies. If an
external DC supply is connected, an electronic circuit in the EPS draws
power from either the internal or external supply to ensure steady power
delivery to the devices attached to the EPS output ports.
AC Power Socket The EPS adjusts to any supply voltage from 90 through 240V AC.
Guidelines for
Network
Configuration
Design your network with these guidelines in mind:
■ In a typical application, the maximum UTP cable length is 100 m (328
ft.) using Category 5 cable (from the main switch or hub to the
far-end NIC device).
■ 3Com recommends that you use a short UTP cable of 1 to 2 m (6 to 7
ft.) from the switch or hub to the EPS and a longer UTP cable of 1 to
90 m (3 to 300 ft.) from the EPS to the powered device such as the
NBX Business Telephone or a 3Com wireless access point.
Sample topologies are shown in Figure 4 and Figure 5.