ZLR964222L
Line Module User Guide
36
Microsemi Corporation Confidential and Proprietary
The adaptive ringing feature for Le9642 requires
VP-API-II version 2.24.0
or later. By default the Adaptive Ringing
feature is disabled.
The following ZTAP CLI command enables the feature on both channels, sets the power threshold to 1.2W per
channel (26 * 39mW / 2) and sets the minimum ringing voltage to 83% of the nominal ringing voltage:
api so 100 -d VP_DEVICE_OPTION_ID_ADAPTIVE_RINGING 61 83 VP_ADAPT_RING_SHARED_BB_ABS
Once enabled, the ringing voltage should be at its nominal voltage in open circuit and drops to its minimum if the
load exceeds approximately the power threshold that has been configured. The power level and ringing reduction
level are configurable.
Adaptive ringing can be disabled using the following ZTAP CLI command:
api so 100 -d VP_DEVICE_OPTION_ID_ADAPTIVE_RINGING VP_ADAPTIVE_RINGING_DISABLED
Figure 27 - Adaptive Ringing Behaviour, 0 REN to 5REN
In Figure 25 above, continuous ringing is sent while the load a varied from 0 to 5REN and then back to 0REN.
Adaptive Ringing in this case is configured to roll back the ringing amplitude at a 3REN load. Yellow and Blue traces
are tip and ring respectively. The magenta trace is VBATH. When adaptive ringing kicks in, VBATH is also reduced.
By enabling adaptive ringing, higher REN loads can still be supported while minimizing maximum power
consumption of the FXS.
