Chapter 6.2: Advanced Voice over DSL Configuration
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6.2.6 Echo Cancellation
The IAD complies with G.168 which says:
The echo cancellers covered by this Recommendation should be equipped with a
tone detector that conforms to this sub clause. This tone detector should disable
the echo canceller only upon detection of a signal which consists of a 2100 Hz
tone with periodic phase reversals inserted in that tone, and not disable with any
other in-band signal, e.g., speech, or a 2100 Hz tone without phase reversals.
The tone disabler should detect and respond to a disabling signal which may be
present in either the send or the receive path.
The IAD is detecting the tone in both directions. The Phone LED indicates the
status of the echo canceller:
Stays ON continuously, echo canceller is ON in both directions.
600ms ON 100ms OFF the echo canceller is OFF in one direction.
1600ms ON 100ms OFF the echo canceller is OFF in both directions.
