Comtrol AT Commands - Manual (Page 82)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Conexant 102184B
3-56
-TTE - Threshold Adjustments for Telephony Extension
This command allows the host to set/tune the telephone extension features for the modem
to determine Line In Use, Extension Pickup, Remote Hang-up, and Digital Line
Protection and Line Interruption Immunity conditions. An ATZ or AT&F will load
default values.
Syntax
-TTE=<Line In Use voltage drop threshold>, <Extension Pickup voltage drop
threshold>, <Remote Hang-up voltage drop threshold>, <Digital Line Protection
current threshold >, <Line Interruption Immunity >,<RESERVED>
Range: (0-9999) 1 , (0-9999) 1 , (0-9999) 1 , (0-9999), (0-255), (0-255)
Units: 1/10 volt (first three parameters), 1 mA (fourth parameter), 100 ms (fifth
parameter)
Defined Values
<Line In Use voltage drop threshold> 1
1000 = 10.00 V drop while modem is on-hook. (Default.)
<Extension Pickup voltage drop threshold> 1
150 = 1.50 V drop while modem is off-hook; this value must
be less than the Remote Hang-up voltage drop threshold.
(Default.)
<Remote Hang-up voltage drop threshold> 1, 2
500 = 5.00 V drop while modem is off-hook; this value must
be greater than the Extension Pickup voltage drop threshold.
(Default.)
<Digital Line Protection current threshold>
160 = 160 mA while modem is off-hook (Default.):
<Line Interruption Immunity>
0 = 200 ms (Default.)
1 = 200 ms
2 = 200 ms
n (where n > 2) = n*100 ms
<RESERVED> 056 (Default.)
Reporting Current or Selected Value
Command: AT-TTE? Queries current setting
Notes:
1. Thresholds are difference thresholds. Example: The line would be considered “in
use” if the Tip & Ring voltage dropped by 10.00 V. Another Example: If the modem
is off-hook and the voltage drops by more than 2.50 V, then the modem would
consider the condition as an extension pickup.
2. The <Remote Hang-up voltage drop threshold> must always be less than the
<Extension Pickup voltage drop threshold). Otherwise, the extension pickup will not
function.