Screened Cabling (F/UTP)
As a result of the release of TIA/EIA/IS-729 and the maturity of the '568-B and '11801:2002 standards, telecommunications groups recognize the presence of an overall shield over four twisted-pairs; a media termed Screened Twisted-Pair. This cabling type is recognized as F/UTP, which stands for a foil applied over unshielded twisted-pairs.
F/UTP Cable:
- Color-coding:
- Pair 1 = White/Blue - Blue
- Pair 2 = White/Orange - Orange
- Pair 3 = White/Green - Green
- Pair 4 = White/Brown - Brown
- 0.51mm (24 AWG) 100 . 4-pair enclosed by a foil shield.
- A copper conductor drain wire of .040mm (26 AWG) or larger shall be provided.
- Should be marked "100 . ScTP" or "100 . F/UTP", in addition to any safety markings required by local or national codes.
- Same mechanical and transmission requirements apply to backbone and horizontal cables.
- Additional performance requirements, including surface transfer impedance, is specified in TIA/EIA-568-B.2 and ISO/IEC 11801:2002.
Screened Connectors:
- Interface and pair assignments same as IEC 60603-7 ('568-B.1 states that all 4 pairs must be connected).
- Additional transfer impedance and shield mating interface requirements specified in IEC 60603-7-3 and IEC 60603-7-5.
F/UTP Patch Cords:
- Specifications call for 26 AWG (7 strands @ 0.15mm) or 24 AWG (7 strands @ 0.20mm) stranded conductors.
- Allows for an overall shield.
- Allows for 50% more attenuation than horizontal cable.
F/UTP Installation Practices:
- Shield shall be bonded at both ends at the "Telecommunication Grounding Busbar".
- The difference between the two grounds shall be no more than 1.0 V RMS.
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