9H423-26 Cabling Requirements
A-2
Fast Ethernet Standard Requirements
100BASE-TX
The IEEE 802.3u (Fast Ethernet specification) specifies for 100BASE-TX to use
either two pair 100 ohm Category 5 unshielded twisted pair (UTP) cable or 2 pair
150 ohm shielded twisted pair (STP) cable. This module utilizes Category 5 100
ohm UTP Cabling systems
. Two copper wires, each encased in its own
color-coded insulation, are twisted together to form a ‘twisted pair’. Numerous
twisted pairs are then packaged together to form twisted pair cables in an outer
sheath. Twists in the cable block interference between pairs by using balancing
and filtering techniques through media filters and baluns. Noise is induced
equally on two conductors that cancels out at the receiver. Because of this and the
fact that UTP cabling is lightweight, thin, inexpensive, and versatile, UTP cabling
tends to be the cable of choice.
The typical single-UTP cable contains four pairs of wires connected to a RJ45
(Figure A-1). Two pairs of conductors, one pair of wires for transmit and one pair
of wires for receive, are needed for 100BASE-TX transmission. For 100BASE-TX,
the remaining two pairs are unused. (10BASE-T4 and 100BASE-T4 utilize all four
pairs.) Refer to Table A-1 and Figure A-2.
Figure A-1. RJ45 Connector
Contact Blades
Locking Clip
Locking Arm
1845n14
Summary of Contents for SmartSwitch 9000
Page 1: ...SmartSwitch 9000 9H423 26 User s Guide 9032242 02 ...
Page 2: ......
Page 30: ...Operation 3 10 ...
Page 34: ...LANVIEW LEDs 4 4 ...
Page 38: ...Specifications 5 4 ...