Loop Diagnostics Test Parameters; Loopback Screen - ZyXEL Communications MSC1024G Series User Manual

Chapter 8 Diagnostic Screens

8.2.1 Loop Diagnostics Test Parameters

The following table lists the loop diagnostics test parameters that display, see the ITU-T's
G.992.3 for more information.
Table 56 Loop Diagnostics Test Parameters
LABEL
near end
far end
attainable bit rate
(kbps)
loop attenuation
(dB)
signal attenuation
(dB)
snr margin (dB)
actual tx power fe
(dBm)

8.3 Loopback Screen

Click Diagnostic > Loopback in the navigation panel to display this screen. Use this screen to
perform loopback tests.
178
DESCRIPTION
This column of diagnostics results is for the upstream traffic (coming from the
subscriber to the IES).
This column of diagnostics results is for the downstream traffic (going from the
IES to the subscriber).
This is the upstream and downstream attainable net data rate in Kilobits/s.
This is the upstream and downstream line attenuation, measured in decibels
(dB).
Loop attenuation is the difference between the power transmitted at the near-end
and the power received at the far-end. Loop attenuation is affected by the
channel characteristics (wire gauge, quality, condition and length of the physical
line).
This is the upstream and downstream signal attenuation (reductions in amplitude
of the DSL signal). It is measured in decibels (dB).
Signal attenuation is affected by factors such as noise, heat, crosstalk and loop
attenuation.
This is the upstream and downstream Signal-to-Noise Ratio margin (in dB). A
DMT sub-carrier's SNR is the ratio between the received signal power and the
received noise power. The signal-to-noise ratio margin is the maximum that the
received noise power could increase with the system still being able to meet its
transmission targets.
This is the upstream and downstream far end actual aggregate transmit power (in
dBm)
MSC1000G/1024G/1224G Series User's Guide