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Nokia Net Monitor description (DCT3)
MAIN PAGE Test 10 – TMSI, PRP, T3212 (Location Update) timer and AFC/AGC InformationAvailable in: 2100, 3330, 5110, 6150, 6210, 7110, 8210, 8250 This test displays information about the state of the location update timer, the TMSI (Temporary Mobile Subscriber Identity), the PRP (Paging Repeat Period) and the AGC/AFC (Automatic Gain Control / Automatic Frequency Control).
TMSI: Temporary Mobile Subscriber Identity – the unique 32-bit code used by the network to identify the MS, displayed in hexadecimal. When not available (i.e. phone unable to contact network), this will be displayed as ‘x’. The TMSI is used in place of the IMSI by the network to protect user confidentiality. [GSM 03.03:2.4, GSM 03.20:2.x] T3212 ctr: Current value of the T3212 timer – this timer displays the length of time since the last phone location update, in units of 6 minutes (deci-hours). This timer is reset every time the phone communicates with the GSM network or when the LAC changes. [GSM 04.08:4.4.2] T3212 tim: Maximum value of the T3212 timer. When (if) the current T3212 value reaches the max T3212 value a phone location update is performed, and the current T3212 timer is reset to 0. If this value is set to 0, the periodic location updates are not performed. Units are 6 minutes long, the maximum value is 240 (1 day). This value is assigned by the network. [GSM 04.08:4.4.2] PaRP: Paging Repeat Period – this determines how often the phone enables its receiver to check for notifications from the network (e.g. to see if someone is calling). Units are in 51-multi-frames, which are ~253ms long. Ranges between 2-9, larger numbers mean larger periods, but less power consumption. [GSM 05.02:6.5.2, 6.5.3] DSF: Downlink Signal Failure value. This value indicates the failure rate of paging messages. The counter starts at the closest integer to 90/PRP. Everytime a successful paging message is decoded, the counter is increased by 1, for every failed message, it is decreased by 4. The counter never exceeds it’s initial value. When DSF <= 0 the MS looks for a new cell. [GSM 05.08:6.5] AGC: – Automatic Gain Control value – this value shows how much the phone is adjusting its Rx sensitivity, displayed at all times, but is only correct when MS is on TCH or SDCCH. The higher the value, the weaker the signal from the BTS. AFS: Automatic Frequency Control Digital to Analog Converter value – shows how much the phone is correcting its frequency to match that of the BTS. Ranges from -1024 to +1023, the further the value is from zero, the more corrections are being made. Ch: RF channel of current serving cell. If hopping is enabled, ‘H’ will appear in front of the channel number. [GSM 05.05:2.x] |
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