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STP cable categories are listed as follows:

•

IBM Type 1 consists of two STP lengths of 22 AWG solid wire for 
data. There are three versions of Type 1: Indoor, Outdoor, and Plenum. 
It is typically used for the longest cable runs within the walls of 
buildings. 

•

IBM Type 2 is similar to Type 1 data cable, but has four additional 
UTP lengths of 22 AWG solid wire carried outside of the shield casing. 
There are two versions of Type 2: Plenum and Outdoor. It is typically 
used for voice communication and often used to wire cable runs within 
the walls of buildings.

•

IBM Type 6 consists of two STP lengths of 26 AWG stranded wire for 
data. Used in patch panels or to connect devices to/from wall jacks. 
Attenuation for Type 6 cable is 150% of Type 1 cable (e.g., 66 m of 
Type 6 =100 meters of Type 1).

•

IBM Type 9 is similar to Type 1, but uses 26 AWG solid wire. 
Attenuation for Type 9 cable is 150% of Type 1 cable (e.g., 66 m of 
Type 9 = 100 meters of Type 1).

The attenuation values shown Table B-2 include the attenuation of the 
cables, connectors, patch panels, and reflection losses due to impedance 
mismatches in the segment.

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.)

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.)