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IBM Type 6 consists of two STP of 26 AWG stranded wire for data.
Because of its high attenuation, Type 6 is used only in patch panels
or to connect devices to/from wall jacks. Attenuation for Type 6
cable is 3/2 x Type 1 cable (attenuation for 66 m of Type 6 =
attenuation for 100 m of Type 1).
IBM Type 9 is similar to Type 1, but uses 26 AWG solid wire. Like
Type 6, because of its high attenuation, Type 9 is used only in patch
panels or to connect devices to/from wall jacks. Attenuation for
Type 9 cable is 3/2 x Type 1 cable (66 m of Type 9 = 100 m of
Type 1).
2.3.2 STP Cable Lengths to Stations
The physical length of the cable connecting a station to a TCU port
on the concentrator is referred to as the lobe length. The maximum
lobe length attainable with the concentrator, under ideal
conditions, is shown in Table 2-5. Cable routing, connector
attenuation, noise and crosstalk can adversely affect the maximum
lobe length.
Table 2-5. STP Maximum Lobe Lengths.
STP
Types
1 & 2
6 & 9
Mixed STP Cable Types
If cable types are to be mixed in the installation, compensations
must be made for the different cable attenuations. For example,
Type 6 & 9 cables can be run for only 2/3 the distance of Type 1:
100 meters (Type 1)
Maximum Length
@ 4 Mb/s
meter
(feet)
s
300
(984)
200
(656)
66 meters (Types 6, 9)
STP Cable Lengths to Stations
@ 16 Mb/s
meter
(feet)
s
150
(492)
100
(328)
Page 2-7
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