DHY-03 User Handbook
33
Telephone Interface Adaptation Differential – parameters 43,68,93,118,143,168,193
This parameter sets the minimum difference between the line input signal and the network
received signal for which recalculation of the network cancellation coefficients will take
place (ie adaptation is allowed). This differential can be expressed either as an absolute
value or as a proportion of the line input signal.
Absolute
Difference
1.5dB
3dB
4.5dB
6dB
7.5dB
9dB
Parameter
Value
8
16
24*
32
40
48
Proportional
Difference
6.25%
12.5% 18.75%
25%
31.25% 37.5% 43.75%
50%
Parameter
Value
129
130
131
132
133
134
135
136
Table 3-16 : Adaptation Differential Parameter Values.
* = default value and set value for firmware versions before v1.40
Telephone Interface Adaptation Response – parameters 44,69,94,119,144,169,194
This parameter sets the response of the adaptation routine and is expressed as a proportion
of the maximum value (100%).
Percentage
12.5%
25%
37.5%
50%
62.5%
75%
87.5%
100%
Parameter
Value
1
2
3
4
5
6
7
8*
Table 3-17 : Adaptation Response Parameter Values.
* = default value and set value for firmware versions before v1.40
Miscellaneous Register – parameters 45, 70, 95, 120, 145, 170 & 195
A number of miscellaneous bits have been defined in this register to set new features
in the code.
Three new bits have been defined in this version:
Bit 5 is set to reverse the polarity of the mlfunc pin so that if the pin is open, the remote line
hold acts as a latching input i.e push to hold, and push to drop the line. If the pin is closed
the remote line hold acts as a momentary input i.e push to hold, and release to drop
the line.
Bit 6 is set to force the remote line hold signal to be a master when in momentary mode.
If this is set and the mlfunc pin on the remote selects momentary mode then the only
way the unit can pick up or drop the line is via the remote port.
Bit 7 is set to lower the noise gate threshold, which means that the noise gate will activate
once a signal has fallen to a signal level 5db lower than at present.
SERIAL PORT CONTROL
SERIAL PORT C
ONTR
OL
3