IBM 5500-01E, Руководство по эксплуатации, установке и обслуживанию

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Note: Although 24 AWG UTP is typically used for network wiring, 22 AWG
is available and might offer lower DC resistance or attenuation. Only use 22
AWG between patch panels or punch down blocks, because most RJ
connectors cannot accommodate 22 AWG wire. For compatibility
information, contact the cable and connector manufacturers.
When using twisted-pair cable, comply with one of the industry cabling
standards. Using a structured wiring standard helps document and
troubleshoot a network.
RJ Connector Standards
Industry standards specify the wire pairs and colors of the UTP wire for RJ
connectors. The modules use either 6-position (RJ11) or 8-position modular
plug/jacks (RJ45) for UTP connectivity.The most common wiring standard
now being used with 4-pair RJ45 connectors is the EIA/TIA 568 B. Using this
standard protects your wiring investment, because both 10BaseT Ethernet and
Token Ring networks use the same standard. The configuration for this
standard is shown in Figure 73.
Figure 72: Electrical Specifications for Cables
UTP
Category 3
UTP
Category 4
UTP
Category 5
FTP
Wire Type Unshielded Unshielded Unshielded Shielded
Wire Size 24 AWG solid 24 AWG solid 24 AWG solid 24 AWG solid
Next dB @ 1000ft 41 @ 1 MGz
32 @ 4 MHz
23 @ 16 MHz 56 @ 1 MHz
45 @ 4 MHz
38 @ 16 MHz 62 @ 1 MHz
63 @ 4 MHz
44 @ 16 MHz 62 @ 1 MHz
53 @ 4 MHz
44 @ 16 MHz
Nominal Impedance ohms 100 ± 15% 100 ± 15% 100 ± 15% 100 ± 15%
Maximum Attenuation dB/1000ft 6.5 @ 1 MHz
17 @ 4 MHz
40 @ 16 MHZ 6.5 @ 1 MHz
13 @ 4 MHz
27 @ 16 MHz 6.3 @ 1 MHz
13 @ 4 MHz
25 @ 16 MHz 6.3 @ 1 MHz
13 @ 4 MHz
25 @ 16 MHz
Maximum Capacitance pF/foot 20 17 17 17