American Standard TRACER CH532 manual Cable characteristics, Characteristic impedance ohms

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 (0.65mm2) cable

D-C resistance (ohms/1000 feet at 20°C) maximum for a
single copper conductor regardless of whether it is solid	18.0
or stranded and is or is not metal coated
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 mm2) 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.

28 CG-SV01B-E4