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3 C O M
®
N J 10 0 N E T W O R K J A C K
The 3Com
NJ100
®
Network Jack
supports VoIP
and the proposed
IEEE 802.3af
specification for
Power over Ethernet.
2
Quality of Service (QoS), or 802.1Q
VLANs. However, although it cannot
add VLAN or QoS information to the
frames as they pass through the switch,
the network jack supports any VLAN
or QoS tags the frames contain. Future
versions are expected to support
802.3p traffic prioritization.
VoIP Compatibility
Does the 3Com NJ100 Network Jack
support VoIP?
The 3Com NJ100 Network Jack can
accommodate voice traffic two ways:
In a converged voice and data net-
work environment, an IP phone can
be plugged into one of the 10/100
switched ports. To support Power
over Ethernet, the IP phone must be
plugged into Port #1 of the 3Com
NJ100 Network Jack. For more dis-
cussion of Power over Ethernet and
power forwarding, please review the
Power Sources section of this docu-
ment and the Power Considerations FAQ.
If voice and data networks are wired
separately, you can use one of the
3Com NJ100 Network Jack's pass-
through ports as the connection point
for the IP phone. The pass-through
port is wired separately from the
switched 10/100 ports—with cable
being pulled and terminated in the
traditional manner.
An additional way to connect voice
and data through the network jack is
by using the pass-through port to
connect your legacy voice system to
the PBX in the telephone room.
Does the 3Com NJ100 Network Jack
adversely affect VoIP quality?
3Com lab tests of the 3Com NJ100
Network Jack indicate that even at
data transfer loads within 98 percent
of capacity, there is no significant
degradation in voice response or
quality—even when the other three
switched ports are actively connected.
Power Sources
Does the 3Com NJ100 Network Jack
require power?
Yes. The 3Com NJ100 Network Jack is
an active device and requires a source
of power, which must be purchased
separately. LEDs on the face indicate
power and LAN connectivity.
How is the 3Com NJ100 Network
Jack powered?
The 3Com NJ100 Network Jack is
powered by one of the following
options:
3Com Network Jack Single-Port
Power-over-Ethernet Midspan
Solution (3CNJPSE) provides
midspan power to a single 3Com
NJ100 Network Jack. This in-line
power source can be connected to
the network jack at the end-user
location or installed in the wiring
closet. List price: $29.00
3Com Network Jack Multiport
Power-over-Ethernet Midspan
Solution (3CNJPSE24) provides IEEE
802.3af-compatible midspan power
for up to 24 network jacks. It must be
installed in the wiring closet, where it
adds Power over Ethernet to any man-
ufacturer's switch. This is the optimal
choice for installation convenience.
List price: $1,299.00
3Com Ethernet Power Sources
(3C10220, 3C10222) provide midspan
power for 12 or 24 ports, respectively.
3Com Ethernet Power Sources do not
conform to the proposed 802.3af stan-
dard. These 19-inch, rack-mountable
units were originally designed to
power 3Com NBX
telephone equip-
®
ment, but can also power 3Com NJ100
Network Jacks with the proper dip-
switch settings. 3C10220 List price:
$1,282.00 3C10222 List price: $1,683.00
Any 802.3af-compliant power-
forwarding device can be used to
provide midspan power for 3Com
NJ100 Network Jacks.
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