Chapter 3: Supported Reports and KPIs
Table 2: Key performance indicators
KPI | Comment |
|
|
|
|
MOS | Mean Opinion Score. This is an high level metric. Note: There is no |
| algorithm for Mean Opinion Score calculations. This is a subjective metric |
| from the end user point of view. In voice communications, particularly |
| Internet telephony, the mean opinion score (MOS) provides a numerical |
| measure of the quality of human speech at the destination end of the circuit. |
| The scheme uses subjective tests (opinionated scores) that are |
| mathematically averaged to obtain a quantitative indicator of the system |
| performance. To determine MOS, a number of listeners rate the quality of |
| test sentences read aloud over the communications circuit by male and |
| female speakers. A listener gives each sentence a rating as follows: - 1 bad; - |
| 2 poor; - 3 fair; - 4 good; - 5 excellent. The MOS is the arithmetic mean of |
| all the individual scores, and can range from 1 (worst) to 5 (best). In our |
| context, our MOS calculation is based on the consolidation of Jitter, Latency |
| and Packets Lost values which give us a good overview of the real MOS |
| value. |
|
|
NbPacketsLost | Number of Packets Lost by the subelement during a call. This metric comes |
| from the CMR table. Its set only once the call is established. This metric is |
| only available for IP Phones. |
|
|
NbPacketsReceived | Number of Packets Received by the subelement during a call. This metric |
| comes from the CMR table. Its set only once the call is established. This |
| metric is only available for IP Phones. |
|
|
NbPacketsSent | Number of Packets Sent by the subelement during a call. This metric comes |
| from the CMR table. Its set only once the call is established. This metric is |
| only available for IP Phones. |
|
|
OffNet | Identifies a call where at least one PSTN Gateway is involved in the Voice |
| path, with the following criteria: - Inbound or Outbound call - Internal or |
| call to/from PSTN number - Intersite or Intrasite Legacy PBX Call |
|
|
OnNet | Identifies a call where the caller is an internal extension and where the callee |
| is also an internal extension, from the same site or different sites, with the |
| following criteria: - Outbound call - Internal call - Intersite or Intrasite IP |
| Call - No PSTN Gateway is involved in the Voice path - This is a pure IP to |
| IP call |
|
|
Outbound Loss (percent) | Out of all outbound traffic to be sent by this entity, the percentage of PDUs |
| that: (a) contained defects which prevented them from being transferable, or |
| (b) were discarded even though no errors are detected (i.e. due to congestion |
| or resource limitations). |
|
|
PSTN Gateway Active DS0 Channels (Nb) | Total number of active DS0 channels for all of the enabled PRIs in a PSTN |
| device |
|
|
PSTN Gateway Active DS0 Channels (Nb) | Total number of currently active DS0 channels for a PSTN gateway |
(Gauge) |
|
|
|
PSTN Gateway Call Setup Quality (percent) | Percentage of successful call setups for a PSTN gateway device |
(Successful / Total) |
|
|
|
PSTN Gateway DS1 Active DS0 Channels | Number of Active DS0s Channel that are active for a specific Serial E1/T1 |
(Nb) | Interface. Because there is no specific OID for thisin the MIB we assume |
| that: 1 Call = 1 DS0 Channel = 64 kbpsThenThroughput (in or out) / |
| 64000 = Active Channels |
|
|
42 | IBM Tivoli Netcool/Proviso Cisco IP Telephony 2.4.0.0 Technology Pack |
