R2511-HP MSR Router Series Voice Command Reference(V5)

80
Syntax
dtmf threshold analog index value
undo dtmf threshold analog index
Views
Analog FXS voice subscriber line view, analog FXO voice subscriber line view, analog E&M voice
subscriber line view
Default command level
2: System level
Parameters
analog: Analog voice subscriber line.
index: Index number corresponding to a threshold, an integer 0 through 12.
value: Threshold corresponding to the specified index. The value range varies with indexes. For details,
see Table 26.
A
ccording to the energy level of the row and column frequencies as well as the energy level of their
doubled frequencies, the system determines whether the input DTMF digit is valid.
The maximum energy of the input signal in the row frequency group is ROWMAX and the corresponding
doubled frequency energy is ROW2nd. The maximum energy in the column frequency group is
COLMAX and the corresponding double frequency energy is COL2nd.
Table 26 Meaning of the index numbers
Inde
x
Meanin
g
Value ran
g
e Remarks
0
Lower limit of (ROWMAX + COLMAX). The input
signal can be recognized as a DTMF digit if
(ROWMAX + COLMAX) > 0.
1 to 4,999, with a
default of 1,400
The larger the value, the
higher the detection
specificity and the lower
the detection sensitivity.
1
Upper limit of the maximum value of ROWMAX
or COLMAX, whichever is larger. This limit is
used for detecting the inter-digit delay. A
detected digit is regarded ended only when max
(ROWMAX, COLMAX) < 1.
1 to 4,999, with a
default of 458
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.
2
Lower limit of COLMAX/ROWMAX, where
ROWMAX < COLMAX. An input signal is
recognized as a DTMF digit only when 10 x
(COLMAX/ROWMAX) > 2.
–18 to –3 dB, with a
default of –9 dB
The larger the value, the
higher the detection
specificity and the lower
the detection sensitivity.
3
Lower limit of ROWMAX/COLMAX when
COLMAX  ROWMAX. The function is similar to
that of index 2. An input signal is recognized as
a DTMF digit only when 10 x
(ROWMAX/COLMAX) > 2.
–18 to –3 dB, with a
default of –9 dB
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.
4
Upper limit of the ratio of the second largest
energy level from the row frequency group to
ROWMAX. The ratio must be lower than this limit
for the input signal to be recognized as a DTMF
digit.
–18 to –3 dB, with a
default of –9 dB
The smaller the value,
the higher the detection
specificity and the lower
the detection sensitivity.