SMC Networks SMC7404WBRA manual Scheme is employed to ensure higher data integrity. For

ADSL

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	There are two latency paths that may be used: fast and
Correction	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

Interleaved Path

CRC Error

Loss of Signal

Defect

Indicates the number of Fast Path Cyclic Redundancy Check errors.

Indicates the number of Interleaved Path Cyclic Redundancy Check errors.

Momentary signal discontinuities.

Loss of Frame	Failures due to loss of frames.
Defect

4-55