RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
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Table 13-1. DTMF Receiver Performance Characteristics
Characteristic
Minimum10
Maximum10
Units
Programmable?
Notes
Acceptable Twist
-8.2 ±0.2
+4.3 ±0.2
dB
Yes
1, 2, 4, 5, 6, 7, 9
Acceptable Positive
Frequency Deviation
+1.5 to +3.2
%
Yes
1, 3, 4, 5, 6, 7, 9
Acceptable Negative
Frequency Deviation
-2.1 to -2.8
%
Yes
1, 3, 4, 5, 6, 7, 9
Required On-Time
40.0 ±1.0
ms
Yes
2, 3, 4, 5, 6, 7, 9
Required Off-Time
40.0 ±1.0
ms
Yes
2, 3, 4, 5, 6, 7, 9
Required Cycle-Time
93.0 ±1.0
ms
Yes
2, 3, 4, 5, 6, 7, 9
Dynamic Range
-43.0
0.0
dBm
Yes
1, 2, 3, 5, 6, 7, 9
Signal-to-Noise Ratio
12.0
dB
-
1, 2, 3, 4, 5, 6, 7, 9
Talk Off
2
3
Hits
-
8, 9
Notes:
1. On-time = 50 ms, off-time = 50 ms, and cycle-time = 100 ms.
2. Nominal DTMF frequencies.
3. Both tones of DTMF symbol have equal amplitude, i.e., 0 dB twist.
4. Received signal level = -35.0 dBm.
5. All 16 DTMF symbols transmitted.
6. Error rate of 1/10,000 or less.
7. TAS Telephone Network Simulator Model #112, flat line transmission path.
8. Mitel CM7291 DTMF Receiver Test Cassette.
9. All DTMF receiver parameters are equal to their default values.
10. Values shown are for DTMF Receiver (configuration code 21h).
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