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Management and Diagnostic Console
100
Reviewing Bitloading
The Bitloading pane shows the bits loaded per tone for the upstream (tones 6 to 31) and downstream
(tones 32 to 255) spectrum. A single hex-digit for each tone shows the numeric values (0 to F) in addition to
the bar-graph depiction.
Exit Code Indicates the reason for a lost connection or a terminated training attempt.
Following are examples of the typical values that can be represented:
ERR_LOF_LIMIT - Retrained due to loss of framing.
ERR_LOS_LIMIT - Retrained due to loss of signal.
ERR_HI_BER_LIMIT - Retrained due to excessive CRCs.
RESTART - System deliberately restarted modem (line search, reprovisioning, or 30-
second timeout when waiting for DSL signal.
ERR_STATE_TIMEOUT - Modem timed out during training (for example, the modem
failed to detect pilot signal at the appropriate time).
ERR_ALL_OPTIONS_FAIL - Failed to negotiate a final bitrate with DSLAM.
RETRAIN_HIGHER - Proactive retrain in order to obtain a significantly higher connect
rate.
Echo A measure of the uncancelled echo relative to the background noise on the line.
This is an indication of how much the uncancelled echo is affecting DSL
performance, rather than an absolute measure of the uncancelled echo.
VXCO Indicates the difference between the gateway’s and the DSLAM port’s crystal
frequency in parts per million (ppm).
Rx Gain Indicates the current receive gain settings, which will depend on the length of the
DSL line.
INC Tones Indicates the number of compensation tones on which impulse noise is detected.
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