
collisions even for the smallest possible frame size of 64 bytes (512 bits). But this is only
guaranteed if the first bit of the frame arrives at the most distant subscriber within the collision
domain before the last bit has left the transmitting station. Furthermore, the collision must
be able to propagate to both directions at the same time. Therefore, the maximum distance
between two ends must not be longer than the distance corresponding to the half signal propa-
gation time of 512 bits. Thus, the resulting maximum possible length of the collision domain is
2000 m for a transmission rate of 10 Mbit/s and 200 m for 100 Mbit/s. In addition, the bit delay
times caused by the passed network components also have to be considered.
Table 6: Specified cable properties of the respective cable types per 100 m:
Parameter
10Base-T [10 MHz]
100Base-TX [100 MHz]
Attenuation [dB/100m]
10.7
23.2
NEXT [dB/100m]
23
24
ACR [dB/100m]
N/A
4
Return loss [dB/100m]
18
10
Wave impedance [Ohms]
100
100
Category
3 or higher
5
Class
C or higher
D or higher
The TP cable has eight wires arranged in four pairs of twisted wires. Different color codes
exist for the coding of the wires, the coding according to EIA/TIA 568, version 1, being the one
most commonly used. In this code, the individual pairs are coded with blue, orange, green and
brown color. One wire of a pair is unicolored and the corresponding second wire is striped,
the respective color alternating with white. For shielded cables, a distinction is made between
cables that have one single shield around all pairs of wires and cables that have an additional
individual shield for each pair of wires. The following table shows the different color coding
systems for TP cables:
Table 7: Color coding of TP cables:
Pairs
EIA/TIA 568
Version 1
EIA/TIA 568
Version 2
DIN 47100
IEC 189.2
Pair 1
white/
blue
blue
green
red
white
brown
white
blue
Pair 2
white/
orange
orange
black
yellow
green
yellow
white
orange
Pair 3
white/
green
green
blue
orange
grey
pink
white
green
Pair 4
white/
brown
brown
brown
slate
blue
red
white
brown
Two general variants are distinguished for the pin assignment of the normally used RJ45
connectors: EIA/TIA 568 version A and version B. The wiring according to EIA/TIA 568 version
B is the one most commonly used.
TP cable
Wiring
Connection and wiring > AC500
2023/03/03
3ADR011074, 1, en_US
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