Chapter 16 Test Results
DSL Results
SmartClass TPS User’s Guide
122 22035456, Rev 001 June 2014
SNR Margin
This category provides statistics for the following values in both Up and Down directions.
DSL Errors
Table 24 describes the DSL Errors.
LATN Line attenuation. Attenuation average of all tones/bins (the entire line, including
empty bins/tones).
1MHz ATN Attenuation measured at 1MHz.
Tx Power Power level, in dB, of the VDSL signal, downstream (from the DSLAM) and
upstream (transmitted by the SmartClass Triple Play Services).
INTLV Delay Interleaving depth set by the DSLAM. This is a measure of latency introduced on
the link due to the scrambling of DSL frames to protect data and create a more
reliable link.
Actual INP The INP (Impulse Noise Protection) values negotiated during training.
a. The estimated loop length is a rough estimated based on attenuation. For a more accurate measure of loop length,
use the TDR in Copper mode.
Table 23 SNR Margin results
Result Description
Max Margin The maximum SNR margin upstream and downstream.
Actual Margin SNR margin upstream and downstream.
Min Margin The minimum SNR margin upstream and downstream.
Table 24 DSL Errors
Result Description
FEC Forward Error Correction upstream and downstream for Fast Path and Interleave
Path.
CRC Cyclical redundancy check upstream and downstream for Fast Path and Interleave
Path.
ES Errored Seconds. Number of seconds during which a LOS, SEF, LPR, or CRC
occurred since starting the test.
SES Severely Errored Seconds. Number of seconds during which one or more LOS, SEF,
or LPR errors were present, or 18 CRCs occurred.
UAS Unavailable Seconds. A count of the number of test seconds which met the ITU-T
Rec. G.821 definition of unavailable time.
Table 22 DSL Signal results (Continued)
Result Description
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