FREQUENTLY ASKED QUESTIONS
3Com
®
NJ100 Network Jack
Product Specifications
Is this a hub?
No. The 3Com
®
NJ100 Network Jack is
a four-port, 10/100 wire-speed switch
with one switched 10/100-uplink port
in the back of the unit. The five inte-
grated independent Fast Ethernet
transceivers are fully compliant with
IEEE 802.3 and 802.3u standards.
What colors are available?
The 3Com NJ100 Network Jack comes
in two colors:
• Black, 3CNJ100-BLK
• Cream, 3CNJ100-CRM
Which adapter plates are included
with the 3Com NJ100 Network Jack?
The single-unit pack includes three
adapter plates—blank, Avaya, and
Panduit—that match the network
jack color, black or cream. The
20-unit packs do not come with
adapter plates, which must be
ordered separately. Currently, the
20-unit packs of adapter plates are
only available in cream.
Are the switched ports autosensing
or autonegotiating?
All four switched ports support
IEEE-compliant 10/100 autonegotia-
tion and full duplex or half-duplex
connections.
What switch mode does the 3Com
NJ100 Network Jack utilize?
The 3Com NJ100 Network Jack uses
store-and-forward switch mode. Ethernet
packets from each port are buffered
until the full packet is received. Once
the packet is received, it is forwarded
to any one of the other ports based on
the destination MAC address. The
network jack switch cannot be config-
ured for “cut through” mode.
How many MAC addresses does the
switch table hold?
The 3Com NJ100 Network Jack includes
a high-performance lookup engine with
support for up to 4,096 MAC address
entries. It also includes automatic
learning and aging.
Network Compatibility
Are there compatibility issues with
other networking equipment in the
wiring closet?
No. The 802.3-compliant 3Com NJ100
Network Jack is designed as a client
device. Because it’s an unmanaged
switch, there’s no software to conflict
with your existing management or
networking applications.
Does the 3Com NJ100 Network Jack
support traffic prioritization, QoS,
or multiple VLANs?
No. The 3Com NJ100 Network Jack is
an unmanaged switch, so it doesn’t
deploy 802.1p traffic prioritization,
The cost-saving,
cabling alternative
for IEEE 802.3-
compliant LANs.
