REQUIREMENTS/SPECIFICATIONS
2-4
Table 2-2 IBM Cable Types
Type 1
Two shielded twisted pairs (STP) of 22 AWG solid wire for
data. Used for the longest cable runs within the walls of
buildings.
Type 2
Similar to Type 1 data cable, but having four additional
unshielded twisted pairs of 22 AWG solid wire. These are
carried outside of the shield casing and are typically used for
voice communication. Frequently used to wire cable runs
within the walls of buildings.
Type 6
Two STP of 26 AWG stranded wire for data. This type is used
in patch panels or to connect devices to/from wall jacks.
Attenuation for Type 6 cable is 3/2 x Type 1 cable (66 m of
Type 6 = 100 meters of Type 1).
Type 9
Similar to Type 1, but uses 26 AWG solid wire. Attenuation
for Type 9 cable is 3/2 x Type 1 cable (66 m of Type 9 = 100
meters of Type 1).
Attenuation and Impedance
The maximum attenuation for specific STP cable types is shown in
Table 2-3. The attenuation values include the attenuation of the
cables, connectors, patch panels, and reflection losses due to
impedance mismatches in the segment.
Table 2-3 STP Cable Specifications
Frequency
Impedance
Attenuation
Types 1 & 2
4 Mhz
16 Mhz
150
Ω
±
15%
150
Ω
±
15%
<22 dB/km (6.7 dB/1000 ft)
<45 dB/km (13.7 dB/1000 ft)
Type 6 & 9
4 Mhz
16 Mhz
150
Ω
±
15%
150
Ω
±
15%
<33 dB/km (10 dB/1000 ft)
<66 dB/km (20 dB/1000 ft)
