Parameters of EIA/TIA 568 Posted on February 27, 2017 by Brandy McNeil Up to 50,000 users Facilities up to 10 million square feet 90 meter horizontal distance limit between closet and desktop 4 pairs of conductors to each outletâ??all must be terminated 25-pair cables may not be used (crosstalk problems) May not use old wiring already in place Bridge taps and standard telephone wiring schemes may not be used Requires careful installation procedures Requires extensive testing procedures