ñ
Cables that have been certified as EIA/TIA-568
Category 5 meet all 10BASE-T and 100BASE-TX
specifications. An EIA/TIA-568 Category 5 cable must
be used for 10BASE-T and 100BASE-TX.
ò
The cable can contain two to four twisted pairs, but
only two of the pairs will be used by the 10BASE-T or
100BASE-TX network.
ó
The c represents the velocity of light traveling in a
vacuum, which is 300 000 km/sec (186 400 mi/sec).
Notes
AWG = American Wire Gauge
EIA = Electronics Industries Association
STP = shielded twisted pair
TIA = Telecommunications Industries Association
The following figure illustrates the RJ-45 connector.
10BASE-T or 100 BASE-TX
UTP Cable
RJ-45 Modular Plug Connector
1
2
3
Pins
6
The following figure illustrates the wiring in straight-through
cables.
Twisted
Pair
1
2
3
6
4, 5, 7, 8
RJ-45 Modular Connector
Pin
1
1
2
2
3, 4
10BASE-T / 100 BASE-TX
1
2
3
6
4, 5, 7, 8
Pin
TD+
TD
RD+
RD
RJ-45 Modular Connector
(Not used)
TD+
TD
RD+
RD
(Not used)
Signal
Name
Signal
Name
Relative to the device connected to the adapter
Table 1. Cabling specifications for 10BASE-T and
100BASE-TX link segments
Characteristic
Specification
ñ
Cable type
UTP cable with two twisted pairs
of 22, 24, or 26 AWG
ò
wire
Nominal impedance
100 Ohms
Velocity of propagation
0.585 c
ó
Maximum attenuation
For 10BASE-T: 8 to 10 dB
per 100 m at 10 MHz
For 100BASE-TX: 67 dB
per 305 m at 100 MHz
38
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