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IAC4000 - Internet Access Controller User Guide
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Appendix C. Ethernet Cable Connections
Appendix C. Ethernet Cable Connections
Appendix C. Ethernet Cable Connections
Appendix C. Ethernet Cable Connections
Appendix C. Ethernet Cable Connections
This cable information is provided for your reference only. Please ensure you only connect the
appropriate cable into the correct socket on either this product or your computer.
If you are unsure about which cable to use or which socket to connect it to, please refer to the hardware
installation section in this manual. If you are still not sure about cable connections, please contact a
professional computer technician or NetComm for further advice.
RJ-45 Ethernet Network Ports
RJ-45 Network Ports can connect any networking devices that use a standard LAN interface, such as a
Hub/Switch Hub or Router. Use unshielded twisted-pair (UTP) or shield twisted-pair (STP) cable to
connect the networking device to the RJ-45 Ethernet port. Depending on the type of connection, 10Mbps
or 100Mbps, use the following Ethernet cable, as prescribed.
Caution: Please do not use telephone cables. Telephone cables do not support Ethernet
or Fast Ethernet
Ethernet Type
Cable Requirements
Maximum Length
10BASE-T
Category 3 or better, UTP or STP
100 metres
100BASE-TX
Category 5 or better, UTP or STP
100 metres
Twisted-pair cabling comes in various grades, or categories. Category 5 is required for Fast
Ethernet, and is also the most reliable and most commonly used category. You can buy UTP
Category 5 (Unshielded Twisted Pair) Ethernet cabling in precrimped lengths, or you can crimp
your own. Crimping your own can result in faulty connections if the RJ-45 tips are not
attached properly. Precrimped Category 5 cabling is available at most computer retail stores.
The most reliable and commonly used type of Category 5 cabling used is UTP, or "unshielded
twisted pair." STP, or "shielded twisted pair" wiring is only necessary for network environ-
ments exposed to excessive amounts of electromagnetic interference, or EMI. These environ-
ments include areas with high sources of electrical power, air conditioning, generators, and
radio signals.
STP is also used for wiring outdoors.
There are two types of the wiring: Straight-Through Cables and Crossover Cables. Category 5
UTP/STP cable has eight wires inside the sheath. The wires form four pairs. Straight-Through
Cables has same pinouts at both ends while Crossover Cables has a different pin arrangement
at each end.
In a straight-through cable, wires 1,2,3,4,5,6,7 and 8 at one end of the cable are still wires 1~8
at the other end. In a crossover cable, the wires of 1,2,3,6 are reversed so that wire 1 become 3
at the other end of the cable, 2 becomes 6, and so forth.
RJ-45 plug attached to
cable
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