Dtmf Dialing - Polycom RealPresence Group Series Reference Manual

Audio Specifications for Polycom RealPresence Group 700 Systems
Characteristic
Maximum Input Level
0 dBFS, Analog Inputs
0 dBFS for Line Inputs
Input Impedance
Analog Inputs
Maximum Output Level
Line Output (≥600 W load):
Output Impedance
Line Output
Signal-to-Noise Ratio
Any analog audio input routed to the
analog output
Any digital audio input routed to any
digital output:
Dynamic Range
Either analog audio input routed to
Main Output:
Any digital audio input routed to any
digital output:
Crosstalk and Feed-Through
Any input or output channel to any
other channel
Frequency Response
Any input to any output, Relative to 997
Hz
Total Harmonic Distortion + Noise vs.
Frequency
-1 dBFS Input Level
-20 dBFS Input Level
-1 dBFS input level
-20 dBFS input level

DTMF Dialing

RealPresence Group Series systems generate the following tip/ring signal levels:
● Low-frequency tone: -10.2 dBV, -8.0 dBm when AC termination of the line is 600 Ohms
● High-frequency tone: -8.2 dBV, -6.0 dBm when AC termination of the line is 600 Ohms
● The system seizes the line and waits 1.5 seconds. The number is then dialed with a 80 ms tone period
followed by a 80 ms silence period for each digit.
Polycom, Inc.
Polycom RealPresence Group Series Specifications
Value
0 dBV (1.0 V ), ± 1 dB
RMS
+6 dBV (2.0 V ), ± 1 dB
RMS
20kW, ± 5%
+6 dBV (2.0 V ), 1 dB
RMS
150 W, ± 5%
>90 dB,
>95 dB, A-weighted
>90 dB
>95 dB
≤-90 dB, 20 Hz to 20 kH
+1, -3 dB, 20 Hz to 20 kHz
-80 dB, 50 Hz to 20 kHz
-70 dB, 50 Hz to 20 kHz
-95 dB, 50 Hz to 20 kHz
-75 dB, 50 Hz to 20 kHz
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