REQUIREMENTS/SPECIFICATIONS
Page 2-5
UTP CABLE TYPES
The TRRMIM-2AT and the TPIM-T2 support D-inside wiring
(DIW) voice grade Unshielded Twisted Pair (UTP) cable as
described in
EIA SP-1907B
. Voice grade UTP cabling (e.g., IBM
Type 3 UTP) must conform to the limits shown in Table 2-3.
The increased popularity and cost advantages of UTP cable have
driven refinements to UTP cable design. As a result, better grades
of UTP cable, known as supergrade or level 4, are becoming
available that exhibit improved transmission characteristics. These
improved grades of UTP can often be used to permit operation at
16 Mbit/sec on longer lobe cables.
Attenuation and Impedance
The maximum attenuation for UTP cabling is shown in Table 2-5.
The values listed include the attenuation of the cables, connectors,
patch panels, and reflection losses due to impedance mismatches in
the segment.
Table 2-4 Maximum Drive Distance
Cable Type
Ring Speed
4 Mbit/s
16 Mbit/s
STP (Types 1 & 2)
STP (Types 6 & 9)
770 meters
346 meters
(2525 feet)
(1138 feet)
513 meters
230 meters
(1683 feet)
(755 feet)