ACT6000 User Guide
– January 2021 Page 20 of 52
Notes:
*
Return-Loss
: Due to the impossibility to terminate the line-end for this Automatic Sequence, in some
cases the bad result of the R.L. can be false, above all when the line under test is short (under 500 -
700 meters) or when selected a Base Band mask (Voice or MODEM 56k).
In this case it is suggested to apply the termination at the line-end (i.e. 600 Ohm for Base Band
masks) and perform the R.L. measurement as single test
…see 7.1
** Insertion Loss
: The threshold limit (decreased of 2 dB) is referred to the typical good line with
same length, capacitance and gauge wires.
Local Noise and its remote
estimation, transferred to
the presumed noise floor.
Return-Loss with marker on
the related frequency
reference (1.1 MHz)
*
Longitudinal Balance Loss
with marker on the worse value
of the band.
TDR echogram with marker on
estimated Line End (open) at
2028 m.
Insertion Loss with marker on the
related frequency reference (1.1
MHz)
**
.
Signal-to-Noise Ratio (bit rate)
where are highlighted any DMT
channel amplitude.