3Com 3CNJ100 Installation Manual page 5

Installation Guide
The 3Com Network Jack is a 4-port, unmanaged Ethernet switch
that fits into any standard electrical wall outlet or data port
opening.
The Network Jack brings switching capabilities to any single port
on an Ethernet network by allowing up to four networking
devices, such as computers, printers, Voice Over IP (VoIP)
telephones, and scanners, to be connected to the network via
one Ethernet port. Optional connectors are also available that
allow up to two additional devices to be connected to separate
network segments through the same Network Jack.
The Network Jack needs no software to operate and little or no
configuration. All ports feature 10/100 Mbps auto-negotiation,
which configures the Network Jack for 10 Mbps or 100 Mbps
connections automatically.
Power to the Network Jack can be provided one of the following ways:
Over the network via an integrated switch that supports
I
Power Over Ethernet; specifically, a switch that is compatible
with Capacitive Power Discovery Process (24V or 48V) or IEEE
802.3af-compatible Power Over Ethernet. Power Over
Ethernet, also known as in-line power, is a feature that
provides power onto an Ethernet cable, allowing a device to
receive both data and power from the same network cable.
Over the network via an optional single-port or multi-port
I
Ethernet power supply. See "Setting up the Power Supply"
on page 10 for more information.
Locally via an optional local power supply. See "Using the
I
3Com Local Power Supply" on page 12 for more information.
1