Utp/Levels 3, 4, And 5 Lobe Cables; 120 Ohm (Screened Twisted Pair) Lobe Cables; Utp Level 3 Cable Specifications; Utp Level 4 Cable Specifications - 3Com CoreBuilder 5000 User Manual

2-8 D E
ESIGNING AND XPANDING THE
N
ETWORK

UTP/Levels 3, 4, and 5 Lobe Cables

To maintain maximum performance of your network design, use wiring
that meets or exceeds the specifications defined in Tables 2-5, 2-6, and
2-7. For additional information on UTP cable specifications, refer to the
EIA/TIA Bulletin: Technical Systems Bulletin, Additional Cable
Specifications for Unshielded Twisted Pair Cables, TSB-36, November
1991, Electronic Industries Association.
Table 2-5

UTP Level 3 Cable Specifications

Characteristics
Impedance
Attenuation (dB/100 m)
Crosstalk (dB maximum)
Table 2-6

UTP Level 4 Cable Specifications

Characteristics
Impedance
Attenuation (dB/100 m)
Crosstalk (dB maximum)
Table 2-7

UTP Level 5 Cable Specifications

Characteristics
Impedance
Attenuation (dB/100 m)
Crosstalk (dB maximum)

120 ohm (Screened Twisted Pair) Lobe Cables

3Com supports 120 ohm cable, often called screened twisted pair,
using cable lengths recommended for Level 4 UTP cabling. When using
120 ohm wire, use only 120 ohm patch cables with 120 ohm "in the
wall" wiring.
To maintain maximum performance of your network design when using
the 120 ohm cable, make sure the cable meets the requirements in
Table 2-8.
4 Mbps
90 to 110 ohms
5.6 dB
–32 dB
4 Mbps
90 to 110 ohms
4.3 dB
–47 dB
4 Mbps
90 to 110 ohms
4.3 dB
–53 dB
16 Mbps
90 to 110 ohms
13.1 dB
–23 dB
16 Mbps
90 to 110 ohms
8.9 dB
–38 dB
16 Mbps
90 to 110 ohms
8.2 dB
–44 dB