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TSB-67 Transmission Performance Specification for Field Testing of Unshielded Twisted Pair Cabling Systems

For the purposes of testing unshielded UTP cabling systems, the horizontal link is assumed to contain a telecommunications outlet/connector, a transition point, 90 meters of UTP (Category 3-5), a cross-connect consisting of two blocks or panels and a total of 10 meters of patch cords. The figure below shows the relationship of these components.

Two link configurations are defined for testing purposes. The basic link includes the distribution cable, telecommunications
outlet/connector or transition point and one horizontal cross-connect component. This is assumed to be the permanent part of a link. The channel link is comprised of the basic link plus installed equipment, user and cross-connect jumper cable.

TSB-67 defines the allowable worst case attenuation and NEXT for an installed link. The following tables show the limitations for Attenuation and NEXT respectively for both the basic and channel links.

Basic / Channel Link Attenuation

Frequency
(MHz)
Category 3
(db)
Category 4
(db)
Category 5
(db)
1 3.2/4.2 2.2/2.6 2.1/2.5
4 6.1/7.3 4.3/4.8 4/4.5
8 8.8/10.2 6/6.7 5.7/6.3
10 10/11.5 6.8/7.5 6.3/7
16 13.2/14.9 8.8/9.9 8.2/9.2
20 -/- 9.9/11 9.2/10.3
25 -/- -/- 9.2/10.3
31.25 -/- -/- 10.3/11.4
62.5 -/- -/- 11.5/12.8
100 -/- -/- 21.6/24
Basic / Channel Link NEXT Loss (Pair-to-Pair)
ISO 8802-3: 1990 (E)
Frequency
(MHz)
Category 3
(db)
Category 4
(db)
Category 5
(db)
1 40.1/39.1 54.7/53.3 60/60
4 30.7/29.3 45.1/43.3 51.8/50.6
8 25.9/24.3 40.2/38.2 47.1/45.6
10 24.3/22.7 38.6/36.6 4.5/44
16 21/19.3 35.3/33.1 42.3/40.6
20 -/- 33.7/31.4 40.7/39
25 -/- -/- 39.1/37.4
31.25 -/- -/- 37.6/35.7
62.5 -/- -/- 32.7/30.6
100 -/- -/- 29.3/27.1



 
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