User guide

Appendix B - Qualified TP/FT-10 Cable Specifications and Sources
126 FT 3120 / FT 3150 Smart Transceiver Data Book
Table B.5 Worst-Pair Near-End Crosstalk (dB) Minimum
Values are shown for information only. The minimum near-end cross talk (NEXT) coupling loss for any pair com-
bination at room temperature is to be greater than the value determined using the formula
for all frequencies in
the range of 0.772MHz-20MHz for a length of 1000 feet:
NEXT (F
MHz)
>NEXT(0.772)-15*log(F
MHz
/0.772)
16AWG/1.3mm “Generic” Cable Specifications
The specifications for the 16AWG/1.3mm Generic cable qualified by Echelon for use with TP/FT-10 networks is
presented below. The generic single twisted pair is stranded (19 x 29) with tinned copper.
Table B.6 General Specifications
Table B.7 Attenuation and Propagation Delay Characteristics
Frequency Crosstalk db
772kHz 58
1.0MHz 56
4.0MHz 47
8.0MHz 42
10.0MHz 41
16.0MHz 38
20.0MHz 36
Specification Minimum Typical Maximum Units Condition
DC Resistance, each
conductor
14.0 14.7 15.5
/km
20°C per ASTM D
4566
DC Resistance Unbal-
ance
5% 20°C per ASTM D
4566
Mutual Capacitance 55.9 nF/km Per ASTM D 4566
Characteristic Imped-
ance
92 100 108 _ 64kHz to 1MHz, per
ASTM D 4566
Characteristic Minimum Typical Maximum Units Condition
Attenuation
20kHz
64kHz
78kHz
156kHz
256kHz
512kHz
772kHz
1000kHz
1.3
1.9
2.2
3.0
4.8
8.1
11.3
13.7
dB/km
20°C per ASTM D 4566
Propagation Delay 5.6 ns/m 78kHz
Ω