Datasheet

3.0 Functional Description (Continued)
Subject to change without notice. 26 Rev O www.national.com
DP83815
3.10.4 Line Quality Monitor
It is possible to determine the amount of Equalization being
used by accessing certain test registers with the DSP
engine. This provides a crude indication of connected
cable length. This function allows for a quick and simple
verification of the line quality in that any significant
deviation from an expected register value (based on a
known cable length) would indicate that the signal quality
has deviated from the expected nominal case.
3.10.5 MLT-3 to NRZI Decoder
The DP83815 decodes the MLT-3 information from the
Digital Adaptive Equalizer block to binary NRZI data.
Figure 3-10 EIA/TIA Attenuation vs. Frequency for 0, 50,
100, 130 & 150 meters of CAT V
cable
Figure 3-11 MLT-3 Signal Measured at AII after 0 meters
of CAT V cable
2ns/div
Figure 3-12 MLT-3 Signal Measured at AII after 50
meters of CAT V
cable
Figure 3-13 MLT-3 Signal Measured at AII after 100
meters of CAT V
cable
2ns/div
2ns/div
Obsolete