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10
Appendix
A. ANSI/TIA/EIA-568-A PLUG & Twisted-pair Cable
The IEE802.3u Standards permits the use of category 3, 4, 5 or better
balanced cable pairs, installed according to ANSI/EIA-568-A. This
appendix provides pinout and brief information for the CAT5
unshielded twisted pair cables
.
B. EIA568A pin assignment:
Pin Number
Assignment
1
2
Plus data transmission (Pair 3)
Minus data transmission (Pair 3)
3
6
Plus data receiver (Pair 2)
Minus data receiver (Pair 2)
4
5
Not used by 10BASE-T and
100Base-TX (Data pair 1)
7
8
Not used by 10BASE-T and
100Base-TX (Data Pair 4)
C. Recommend CAT5 UTP specifications
Physical:
FR-PVC cable construction
Cable Type: 4-pair unshielded-twisted pair solid copper
Conductors: 24 AWG, solid bare annealed copper
Operating temperature: -20
0
C to +75
0
C
Electrical:
Impedance: 100 ±15 %
Near-End Cross-talk: 38dB @ 100 MHz
Attenuation: 22 dB/100 m typical @ 100 MHz
Maximum DC resistance : 9.38 / 100 m (24 AWG) at 20
0
C
Maximum DC insulation resistance 150M/km
