Polycom C8 Stereo System User Manual


 
Specifications
3 - 3
THD+N: < 0.005%, -20 dB FS input signal
Common mode rejection ratio: <-61 dB, 20-20,000 Hz, no weighting
Cross talk: <-110 dB, 20-20,000 Hz, 1kHz, channel-to-channel
Latency: Mic/Line inputs to outputs: 20 ms, AEC and NC processing
enabled
Acoustic echo cancellation span: 200 ms
Total cancellation: >65 dB
Convergence rate: 40 dB/second
Noise cancellation: 0-20 dB, software selectable
Control inputs: contact closure
Status outputs: open collector 60 V and 500 mA maximum total per
outputs
All signal ground pins connected to chassis ground through low
impedance planes
Telco
Input gain: -100 to +20 dB in 1 dB steps, software adjustable
Nominal transmit level: 0 dBu in SoundStructure device yields -15 to -17
dBm to phone (country code dependent)
Off hook loop current: 10 mA (minimum) to 120 mA (maximum)
Output gain: -100 to +20 dB in 1 dB steps, software adjustable
Frequency response: 250-3300 Hz
Dynamic range: >70 dB FS, 250-3300 Hz, "A" weighted