TWISTED PAIR 'LEVELS'

Level Usage Electrical Characteristics
1
 Plain Old Telephone Service (POTS) and Integrated Digital Services Network (ISDN) 
Impedatce:
	 not specified
Attenuation
	 not specified
2
 High Cap Circuits (56k, T1, ISDN PRI) 
Impedance:
	 84-113 ohms @ 1Mhz
Attenuation:
	 8.2 dB @ 1Mhz
3
 10BaseT 
Impedance:
	 100 ohms + or - 15% @ 1Mhz
Attenuation:
	7.8 dB @ 1Mhz
	17dB @ 4Mhz
	30 dB @ 10Mhz
	40 dB @ 16Mhz
4
 Extended distance LAN 
Impedance:
	 100 ohms + or - 15% @ 1Mhz
Attenuation:
	 7.8 dB @ 1Mhz
	17dB @ 4Mhz
	30 dB @ 10Mhz
	40 dB @ 16Mhz
5
100 Mbit networks 
Impedance:
	150 ohms + or - 10% @ 1 Mhz
Attenuation:
	 3.2 dB @ 1Mhz
	 6.7dB @ 4Mhz
	10.6 dB @ 13.6Mhz
	 40 dB @ 16Mhz

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