Polycom 2457-23216-002 User Manual

 

Polycom RealPresence Group Series Specifications

Polycom, Inc. 

251

The Polycom 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.

Dynamic Range
Either analog audio input routed to 

Main Output:
Any digital audio input routed to any 

digital output:

>90 dB

>95 dB

Crosstalk and Feed-Through

Any input or output channel to any other 
channel

≤90 dB, 20 Hz to 20 kH

Frequency Response

Any input to any output, 

Relative to 997 

Hz

+1, 3 dB, 20 Hz to 20 kHz

Total Harmonic Distortion + Noise vs. 

Frequency
-1 dBFS Input Level
-20 dBFS Input Level

1 dBFS input level
20 dBFS input level

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