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. |
