<div dir="ltr">I want to query a modem (MC7455) and find out the SNR values periodically. I've noticed that this information is only available while on LTE?<div><br></div><div><div><b>3G: </b></div><div><br></div><div>[root@trx-r2 /]# qmicli -p -d /dev/cdc-wdm0 --nas-get-signal-strength </div><div>[/dev/cdc-wdm0] Successfully got signal strength </div><div>Current: </div><div> Network 'umts': '-80 dBm' </div><div>Other: </div><div> Network 'cdma-1xevdo': '-125 dBm' </div><div>RSSI: </div><div> Network 'umts': '-80 dBm' </div><div> Network 'cdma-1xevdo': '-125 dBm' </div><div>ECIO: </div><div> Network 'umts': '-7.0 dBm' </div><div> Network 'cdma-1xevdo': '-2.5 dBm' </div><div>IO: '-106 dBm' </div><div>SINR (8): '9.0 dB' </div><div> </div><div><b>LTE:</b></div><div><br></div><div>[/dev/cdc-wdm0] Successfully got signal strength</div><div>Current:</div><div><span style="white-space:pre"> </span>Network 'lte': '-71 dBm'</div><div>RSSI:</div><div><span style="white-space:pre"> </span>Network 'lte': '-71 dBm'</div><div>ECIO:</div><div><span style="white-space:pre"> </span>Network 'lte': '-2.5 dBm'</div><div>IO: '-106 dBm'</div><div>SINR (8): '9.0 dB'</div><div>RSRQ:</div><div><span style="white-space:pre"> </span>Network 'lte': '-14 dB'</div><div><b>SNR:</b></div><div><b><span style="white-space:pre"> </span>Network 'lte': '1.4 dB'</b></div><div>RSRP:</div><div><span style="white-space:pre"> </span>Network 'lte': '-102 dBm'</div><div>[root@trx-r6 /]# </div></div><div><br></div><div><br></div><div><br></div><div>To that end I noticed that both connections report SINR. However the value is always static (<b>SINR (8): '9.0 dB'</b>), is this a placeholder or does it vary?</div><div><br></div><div>If I try AT commands it reports SINR and it varies as expected (but not similar to the value reported with libqmi) but again, only shown on an LTE connection:</div><div><br></div><div><br></div><div><b>LTE:</b></div><div><b><br></b></div><div><div>at!gstatus? </div><div>!GSTATUS: </div><div>Current Time: 218<span style="white-space:pre"> </span>Temperature: 39</div><div>Reset Counter: 2<span style="white-space:pre"> </span>Mode: ONLINE </div><div>System mode: LTE <span style="white-space:pre"> </span>PS state: Attached </div><div>LTE band: B20 <span style="white-space:pre"> </span>LTE bw: 10 MHz </div><div>LTE Rx chan: 6300<span style="white-space:pre"> </span>LTE Tx chan: 24300</div><div>LTE CA state: INACTIVE <span style="white-space:pre"> </span>LTE Scell band:B3 </div><div>LTE Scell bw:20 MHz <span style="white-space:pre"> </span>LTE Scell chan:1700</div><div>EMM state: Registered <span style="white-space:pre"> </span>Normal Service </div><div>RRC state: RRC Connected </div><div>IMS reg state: No Srv <span style="white-space:pre"> </span></div><div><br></div><div>PCC RxM RSSI: -69<span style="white-space:pre"> </span>RSRP (dBm): -101</div><div>PCC RxD RSSI: -73<span style="white-space:pre"> </span>RSRP (dBm): -105</div><div>SCC RxM RSSI: -87<span style="white-space:pre"> </span>RSRP (dBm): -112</div><div>SCC RxD RSSI: -89<span style="white-space:pre"> </span>RSRP (dBm): -112</div><div>Tx Power: 0<span style="white-space:pre"> </span>TAC: 0514 (1300)</div><div>RSRQ (dB): -15.0<span style="white-space:pre"> </span>Cell ID: 00017A07 (96775)</div><div><b>SINR (dB): -2.6</b></div></div><div><br></div><div><b>3G:</b></div><div><br></div><div><div>at!gstatus? </div><div>!GSTATUS: </div><div>Current Time: 2636 Temperature: 42 </div><div>Bootup Time: 5 Mode: ONLINE </div><div>System mode: WCDMA PS state: Attached </div><div>WCDMA band: WCDMA 2100 </div><div>WCDMA channel: 10837 </div><div>GMM (PS) state:Requesting srvc NORMAL SERVICE </div><div>MM (CS) state: IDLE NORMAL SERVICE </div><div> </div><div>WCDMA L1 state:L1M_DCH LAC: 8CA2 (36002) </div><div>RRC state: CELL_DCH Cell ID: 000BD119 (774425) </div><div>RxM RSSI C0: -74 RxD RSSI C0: -94 </div><div>RxM RSSI C1: -106 RxD RSSI C1: -106 </div><div> </div><div> </div><div>OK </div></div><div><br></div><div><div><br class="gmail-Apple-interchange-newline">Is it possible to get SNR/SINR for non-LTE connections? Are they not valuable metrics for some reason? It doesn't seem to be possible, even from reading the AT command set, but thought I would check.</div></div><div><br></div><div>Thanks,</div><div><br></div><div>--</div><div>Paul</div></div>