Cabletron Systems TRBMIM-T, User Manual

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MEDIA SPECIFICATIONS
B-2
B.2 SHIELDED TWISTED PAIR (STP)
STP cable has a metallic shielded wrapped around the twisted pairs to
protect the cable from intrusive and unwanted interference from outside
sources. The TPIM-T1 and TPIM-T4 support IBM Type 1, 2, 6, and 9
STP cabling, which is described below:
• IBM Type 1 consists of two STP lengths of 22 AWG solid wire for
data. It is typically used for the longest cable runs within building
walls of buildings.
• IBM Type 2 is similar to Type 1 data cable, but it has four additional
UTP lengths of 22 AWG solid wire carried outside of the shield casing.
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. It is typically 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 is similar to Type 1, but it uses 26 AWG solid wire
instead. Attenuation for Type 9 cable is 3/2 x Type 1 cable (66 m of
Type 9 = 100 meters of Type 1).
IBM Types 6 and 9 are used primarily for lobe connections from stations
to wall jacks or patch panels.
Table B-2 lists STP cable performance specifications.
Table B-1 UTP Performance Specifications
EIA/TIA
Category Electrical
Impedance
Attenuation
@ 4 MHz
dB/1000 ft. Attenuation
@ 16Mhz
dB/1000 ft.
NEXT
dB/1000 ft.
Cat. 3 100
Ω ±
15% 17 40 23
Cat. 4 100
Ω ±
15% 13 27 36
Cat. 5 100
Ω ±
15% 13 25 44
TRBMIM-T BOOK Page 2 Tuesday, July 2, 1996 10:35 AM