Allied-telesis AT-TS24TR Manual de usuario descargar pdf (Pagina 71)

Appendix A

UTP Reference

UTP Wiring Specifications

10BASE-T requires UTP wiring capable of supporting 10 Megabit data

rates. Use Level 3 or better UTP wiring throughout the 10BASE-T wiring

system. The wire should be 22 to 26 AWG, 100 Ω impedance with 3 to 8

twists per foot. Typically, if a cable is ﬂat, the pairs are untwisted and will

cause problems. A cable more or less round in section is likely to be

twisted.

The speciﬁcations of 6 common modular cables and their applicability to

10BASE-T network use are shown in Table 7. The maximum length for

10BASE-T UTP segments is 100 meters (328 ft.).

Table 7: Usable and Unusable Twisted Pair Cable

Cable

Level

Cable Description AC Character Speciﬁcation

Twist/

Foot

10BASE-T

OK?

1 Unshielded untwisted N/A CCITT N/A NO!

2 Individual UTP 100 Ω ± 30 Ω RS232 1BASE5

AT&T PDS

N/A NO!

3 Typical Individual UTP 100 Ω ± 15 Ω TI, AT&T ISDN

10BASE-T

IBM Type 3

3-5 YES

4 Enhanced Individual

UTP

100 Ω ± 30 Ω EIA, TIA

10BASE-T

NEMA

5-8 YES

5 Individual STP 100 Ω ± 30 Ω EIA, TIA

10BASE-T

8-10 YES

IBM

Type 1

Individual STP 150 Ω PCC FT 1 N/A NO!

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 94 95

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Allied-telesis AT-TS24TR Manual de usuario Pagina 71