| MOS | Mean Opinion Score - Level of audio quality for an end-to-end communication. Value is 0 when there is no communication and 5 when communication is perfect. The 0 and 5 values are theoretical and thus never appear in measurements. The presented data refers to average values per call. |
| Routed calls: | Telephone calls successfully established by the network and between the two terminals in question (?the call reached the called terminal?). |
| Abandoned during conversation: | Calls successfully set up by the network but abandoned during the conversation phase. |
| Normal release: | Calls successfully set up by the network and which end normally. |
| Calls not routed: | Calls not established by the network between the two terminals in question (?the call did not reach the called terminal?). |
| Abandoned calls: | Calls interrupted either in the phase of setting up the connection or during conversation. |
| Causes: | Reasons for the interruption of communications. |
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Service unavailable (no network). |
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Network congestion. |
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Failure of the radio link between the mobile terminal and the base station. This can occur when passing through a shadow area of the network in question. |
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Other reasons for call interruption. |
| RSSI signal strength (dBm): | Received Signal Strength Indication - Indication of signal strength received by the mobile terminal. Measured on the control channel (BCCH) and therefore not affected by frequency hopping and downlink power control algorithms. |
| BCCH | Broadcast Control Channel - Conveys information to all mobile terminals (MSs) served by a given BTS (Base Transceiver Station). Transmitted in downlink mode and transports numerous parameters, among them CI (Cell Identity), LAC (Local Area Code), MCC (Mobile Country Code), MNC (Mobile Network Code) and FH (Frequency Hopping) algorithm. |
| FTS | Fixed Telephone Service. |
| PSTN | Public Switched Telephone Network |
