Cabletron Systems 42T Manuel D’Utilisation

MicroMMACs 42T and 44T and TPIMs T1 and T4 support IBM Type 1, 
2, 6, and 9 STP cabling as described below:

•

IBM Type 1: Two STP lengths of 22 AWG solid wire for data. Used 
for the longest cable runs within building walls of buildings.

•

IBM Type 2: Similar to Type 1 data cable, but having four additional 
UTP lengths of 22 AWG solid wire carried outside of the shield casing. 
Typically used for voice communication and often used to wire cable 
runs within the walls of buildings.

•

IBM Type 6: 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 3/2 x Type 1 cable (66 m of Type 6 
=100 meters of Type 1).

•

IBM 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).

The attenuation values shown in Table 2-3 include the attenuation of the 
cables, connectors, patch panels, and reflection losses due to impedance 
mismatches in the segment

.

The lobe length is the physical length of the cable connecting a station to 
its TCU port at the MicroMMAC-T. Table 2-4 lists the maximum lobe 

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.)