AT-3624TR/3648TR Installation Manual - Allied Telesis
AT-3624TR/3648TR Installation Manual - Allied Telesis
AT-3624TR/3648TR Installation Manual - Allied Telesis
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Appendix A<br />
UTP Reference<br />
UTP Wiring Specifications<br />
10BASE-T requires UTP wiring capable of supporting 10 Megabit data rates.<br />
Use Level 3 or better UTP wiring throughout the 10BASE-T wiring system.<br />
The wire should be 22 to 26 AWG, 100 Ω impedance with 3 to 8 twists per foot.<br />
Typically, if a cable is flat, the pairs are untwisted and will cause problems. A<br />
cable more or less round in section is likely to be twisted.<br />
The specifications of 6 common modular cables and their applicability to<br />
10BASE-T network use are shown in Table 5. The maximum length for<br />
10BASE-T UTP segments is 100 meters (328 ft.).<br />
Table 5: Usable and Unusable Twisted Pair Cable<br />
Cable<br />
Level<br />
Cable Description AC Character Specification<br />
Twist/<br />
Foot<br />
10BASE-T<br />
OK?<br />
1 Unshielded untwisted N/A CCITT N/A NO!<br />
2 Individual UTP 100 Ω ± 30 Ω RS232 1BASE5<br />
<strong>AT</strong>&T PDS<br />
N/A<br />
NO!<br />
3 Typical Individual UTP 100 Ω ± 15 Ω TI, <strong>AT</strong>&T ISDN<br />
10BASE-T<br />
IBM Type 3<br />
4 Enhanced Individual UTP 100 Ω ± 30 Ω EIA, TIA<br />
10BASE-T<br />
NEMA<br />
5 Individual STP 100 Ω ± 30 Ω EIA, TIA<br />
10BASE-T<br />
3-5 YES<br />
5-8 YES<br />
8-10 YES<br />
IBM<br />
Type 1<br />
Individual STP 150 Ω PCC FT 1 N/A NO!<br />
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