28 CG-SV01B-E4
LonTalk
®
option
Cable characteristics
Level 4 cable may be used with TP/FT-10 channels. The level 4 cable specification used by Echelon and as originally
defined by the National Electrical Manufacturers Association (NEMA) differs from the Category 4 specification
proposed by the Electronic Industries Association / Telecommunication Industries Association (EIA / TIA).
The following specifications can be used by cable suppliers to identify a compliant Level 4 cable.
Specifications apply to shield or unshielded 22AWG (0.65mm
2
) cable
18.0
D-C resistance unbalance (percent) maximum 5
Mutual capacitance of a pair (pF/foot) maximum 17
Pair to ground capacitance unbalance (pF/1000 feet) maximum 1000
Characteristic impedance (ohms)
772 kHz 102+/- 15%
1.0 MHz 100 +/- 15%
4.0 MHz 100 +/- 15%
8.0 MHz 100 +/- 15%
10.0 MHz 100 +/- 15%
16.0 MHz 100 +/- 15%
20.0 MHz 100 +/- 15%
Attenuation (dB/1000 feet at 20°C) maximum
772 kHz 4.5
1.0 MHz 5.5
4.0 MHz 11
8.0 MHz 15
10.0 MHz 17
16.0 MHz 22
20.0 MHz 24
Worst pair to pair near end crosstalk (dB) minimum. Values are shown for information only. The minimum NEXT
coupling loss for any pair combination at room temperature is to be greater than the value determined using the
formula NEXT (F MHz)>NEXT (0.772)-15log10(F MHz / 0.772) for all frequencies in the range of 0.772 MHz for a length
of 1000 feet.
772 kHz 58
1.0 MHz 56
4.0 MHz 47
8.0 MHz 42
10.0 MHz 41
16.0 MHz 38
20.0 MHz 36
For the TP/FT-10 channel operating in a bus topology , the maximum bus length of level 4 22AWG (0.65 mm
2
) cabling is
1400 meters with a maximum stub length of 3 meters.
It is recommended to use shielded cable if high amplitude modulation noise exist or transient protection is required.
D-C resistance (ohms/1000 feet at 20°C) maximum for a
single copper conductor regardless of whether it is solid
or stranded and is or is not metal coated
