Blind polling: send a ping to every elements every x minutes. It triggers extra network traffics. Total number of packets per hour N = e * x / 60, where e = number of elements, x is minutes.
Severity base polling: send a ping to critical elements more often. For example) GW: every 5 mins, GK: every 6 mins, Switch: every 10 mins, Terminal element: 30 mins, etc.
Dynamic polling: recalculates number of pings based on the previous faults, traffic or volume. Number of packets N = f(1)..f(e), where f is the function being used for calculating faults, traffic and volume.
Manageable VoIP Network – Voice quality measurement
MOS (Mean Opinion Score):
- Subjective measurement of VoIP.
- Pre selected voice sample over different media, replayed to mixed group of men and woman, who rate them from 1 to 5.
PAMS (Perceptual Analysis and Measurement System):
- Designed an intrusive listening speech quality assessment tool where speech quality is computed by injecting a speech like signal at one end and analysing the degraded signal at other end of the network.
Acceptable Acceptable under conditions Unacceptable 0 150 400 0 – 150 ms: Good quality and no echo 151 – 400 ms: Acceptable under certain conditions and echo canceling is needed 401+: Unacceptable for real-time voice traffic and planning and testing purposes only