SMC Networks 7404BRA FRT, User Manual

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ADSL
4-51
Parameter Description
Status
Line Status Shows the current status of the ADSL line.
Data Rate
Upstream Actual and maximum upstream data rate.
Downstream Actual and maximum downstream data rate.
Operation Data/
Defect Indication
Noise Margin
Upstream: Minimum noise margin upstream.
Downstream: Minimum noise margin downstream.
Output Power Maximum fluctuation in the output power.
Attenuation
Upstream: Maximum reduction in the strength of the upstream
signal.
Downstream: Maximum reduction in the strength of the downstream
signal.
Fast Path FEC
Correction
There are two latency paths that may be used: fast and
interleaved. For either path a forward error correction
(FEC) scheme is employed to ensure higher data
integrity. For maximum noise immunity, an interleaver
may be used to supplement FEC.
Interleaved Path
FEC Correction
An interleaver is basically a buffer used to introduce a
delay, allowing for additional error correction techniques
to handle noise. Interleaving slows the data flow and may
not be optimal for real time signals such as video
transmission.
Fast Path CRC
Error
Indicates the number of Fast Path Cyclic Redundancy
Check errors.
Interleaved Path
CRC Error
Indicates the number of Interleaved Path Cyclic
Redundancy Check errors.