Specifications

EN
55
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.
• Loss of Signal Defect Momentary signal discontinuities.
• Loss of Frame Defect Failures due to loss of frames.
• Loss of Power Defect Failures due to loss of power.
• Fast Path HEC Error Fast Path Header Error Concealment errors.
• Interleaved Path HEC Error Interleaved Path Header Error Concealment errors.
Statistics (Superframes represent the highest level of data
presentation. Each superframe contains regular
ADSL frames, one of which is used to provide
superframe synchronization, identifying the start of a
superframe. Some of the remaining frames are also
used for special functions.)
• Received Superframes
Interleaved Number of interleaved superframes received.
• Transmitted Superframes
Interleaved Number of interleaved superframes transmitted.
• Received Superframes Fast Number of fast superframes received.
• Transmitted Superframes Fast Number of fast superframes transmitted.