Data Network Terminal Single-port and Multiport Operating Instructions
104 (128) © Nokia Corporation DN01145897
Nokia Proprietary and Confidential Issue2-0en
Figure 77. Maximal cable length
Factors limiting connection length
The maximum connection length of DNT2Mi is defined by the following
variables:
• Cable attenuation
The attenuation of a cable depends on thickness and pair capacitance. It
also depends on impedance mismatching, resulting from connecting
different types of cables, as well as from the reflections caused by this.
• Cable noise level
Noise in a cable is mainly caused by cross talk between wire pairs. The
main sources of noise are units using the same frequency band.
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
192
256
320
384
448
512
576
640
704
768
832
896
960
1024
1088
1152
1216
1280
1344
1408
1472
1536
1600
1664
1728
1792
1856
1920
1984
2048
kbit/s
m
DNT2Mi reach
0.4mm cable, no noise, BER < 1E-7
2-w, no noise
4-w, no noise
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