DSP-100/2000
Users Manual
Figure 7-11 shows a plot of NEXT and attenuation limits, along with the resulting ACR plot. Notice that the ACR is lower where NEXT and attenuation values are near each other.
Limit in dB
70.0
60.0
50.0
40.0
NEXT
GOOD
30.0
ACR
GOOD
20.0
ATTEN.
GOOD
10.0
0.0
0 | 20 | 40 | 60 | 80 | 100 |
Frequency in MHz
gc37f.eps
Figure 7-11. A Plot of NEXT, Attenuation, and the Resulting ACR
RL
RL (return loss) is the difference between the power of a transmitted signal and the power of the signal reflections caused by variations in the cable’s impedance. A RL plot indicates how well a cable’s impedance matches its rated impedance over a range of frequencies. High RL values mean a close impedance match, which results in a large difference between the powers of transmitted and reflected signals. Cables with high RL values are more efficient at transmitting LAN signals because little of the signal is lost in reflections.
