Philips CPWBS154 User Manual

The following items are included on the ADSL status page:

Parameter Description
Status
• Line Status 

Shows the current status of the ADSL line connection.

• Link Type 

Two types of link: Fast path and Interleaved path.

Data Rate
• Upstream 

Maximum upstream data rate.

• Downstream 

Maximum downstream data rate.

Operation Data/
Defect Indication
• Noise Margin 

Maximum upstream and downstream noise margin.

• Attenuation 

Maximum reduction in the strength of the upstream and 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  An interleaver is basically a buffer used to introduce a delay, allowing for 

Correction

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

The number of Fast Path Cyclic Redundancy Check errors.

Interleaved Path CRC 
Error

The number of Interleaved Path Cyclic Redundancy Check errors.

Loss of Signal Defect

Momentary signal discontinuities.

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 cells 

Number of cells received.

• Transmitted cells 

Number of cells transmitted.

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