Applications: Voice and Low Speed Data. Code Restrictions: OK for power limited circuits. Features: Available in 500ft or 1000ft Tangle-Free Boxes or Spools. Construction: UTP Cables are Unshielded Twisted Pair Cables with a Nominal Impedance of 100 Ohms. Standard Jacket Color: Natural, Blue Gray. Conductor Color Code: Chart 5Maximum Attenuation at 16 MHz: 13.1 db/100mMinimum Next at 16 MHz: 23 db.