ZyXEL Communications P-663H-51, User Manual

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Chapter 4 Device Information
P-663H-51 User’s Guide
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The following table describes the labels in this screen.
Table 8 Device Info > Statistics > ADSL
LABEL DESCRIPTION
Mode This is the ADSL mode that the ADSL link is using.
Type
Line Coding This shows whether the ADSL link is using Trellis coding or Reed-Solomon error
correction. Trellis coding helps to reduce the noise in ADSL transmissions. Trellis
may reduce throughput but it makes the connection more stable. “RS” coding stands
for Reed-Solomon error correction.
Status This shows the ADSL link’s connection status.
Link Power
State This is the ADSL connection’s current power management mode.
SNR Margin
(dB) 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 ZyXEL Device still being able to meet its
transmission targets.
Attenuation
(dB) This is the downstream and upstream Line Attenuation (in dB).
Output Power
(dBm) This field displays the amount of power being used to transmit to the other end of the
ADSL link. Output power varies with the line length and quality. The longer the line is
or the more interference there is on the line, the more power is needed.
Attainable
Rate (Kbps) These are the downstream and upstream highest theoretically possible transfer rates
(in Kbps).
Aggregate
Rate (Kbps) These are the combined downstream and upstream rates (in Kbps) of the two DSL
ports.
DSL1 Rate
(Kbps) These are the downstream and upstream rates (in Kbps) at which the DSL1 port has
been receiving and sending data.
DSL2 Rate
(Kbps) These are the downstream and upstream rates (in Kbps) at which the DSL2 port has
been receiving and sending data.
Super Frames These are the downstream and upstream numbers of downstream and upstream
super frames.
Super Frame
Errors
These are the downstream and upstream numbers of errored super frames sent and
received.
RS Words These are the downstream and upstream numbers of Reed-Solomon error correction
words.
RS
Correctable
Errors These are the downstream and upstream numbers of Reed-Solomon errors.
RS
Uncorrectable
Errors The number of downstream and upstream uncorrectable Reed-Solomon errors.
HEC Errors These are the downstream and upstream numbers of Header Error Control errors.
OCD Errors These are the downstream and upstream numbers of Out of Cell Delineation errors.
LCD Errors The number of 1-second intervals since reset where loss of cell delineation occurred.
Total Cells The total numbers of downstream and upstream ATM cells.
Data Cells The total numbers of downstream and upstream data cells.
Bit Errors The total numbers of downstream and upstream bit errors.