A-6
Cisco uBR924 Router Hardware Installation Guide
OL-0338-01 (3/2000)
Appendix A Technical Specifications
Voice Specifications
Hybrid balance:
Echo Return Loss (ERL)
SRL
> 26 dB (standard test line)
> 14 dB (station off hook)
> 21 dB (standard test line)
> 11 dB (station off hook)
Clipping:
Speech segments <5 ms
Speech segments > 5ms
< 0.5%
0.0%
Impulse noise:
(>= 6 dB below receive signal)
0 in 93% of all 15 min intervals
<= 1 count in all 30 min intervals
Phase hits (>= 10 deg)
0 in 99.75% of all 15 min intervals
<= 1 count in all 30 min intervals
Gain hits (>= ± 3dB)
0 in 99.9% of all 15 min intervals
<= 1 count in all 30 min intervals
Dropouts (>= 12)
0 in 99.9% of all 15 min intervals
<= 1 count in all 60 min intervals
Ringer voltage and frequency
52 VRMS (max, short loop, balanced ringing) at
a default of 20 Hz—the frequency can be changed
using the voice-port ring frequency
configuration command.
Port terminating impedance
600 ohms (default)—this can be changed using
the voice-port impedance configuration
command.
Table A-3
Cisco uBR924 Cable Access Router Voice Specifications (continued)
Metric
Value
