I've been struggling with an embedded EM7455 device for several months now and after trying a whole host of options, I'm throwing myself at the mercy of other experts for help. The EM7455 is installed in an embedded edge device (Core i7) that runs Ubuntu 18.04 server. Nothing magical here.
I've had terrible upload speeds from this device from the start. No matter what we do the upload speed is ALWAYS 0.26Mbps via speedtest-cli. We initially tried an external antenna, basic omnidirectional antenna mounted to a large metal cabinet with a great ground plane. Results were the same, 0.26Mbps upload.
We tried changing the firmware to generic from the stock Verizon firmware. Same, 0.26Mbps. We ensured that we were using the latest firmware from Sierra Wireless, SWI9X30C_02.33.03.00, no change - 0.26Mbps. We've tried different versions of ModemManager, no change. We even thought it might be the device itself so we ordered 2 new EM7455s, also no change.
Most recently we installed a Wilson Wideband 8.5dBi directional antenna and no matter where we aimed it, 0.26Mbps. Download speeds with the Wilson improved a lot - 30Mbps.
Thinking that perhaps we were just in a bad area, though, we tethered the device to a phone on the same network. We were able to get 5/5Mbps via Wifi, tethered. So that told us that it wasn't some strange network/propagation issue, and that it was actually possible to get decent speeds.
So why is this EM7455 stuck at 0.26Mbps?! Help!
Thanks... Sam
EM7455 - 30Mbps down/0.26Mbps up?
Forum rules
Please assure there is not an existing forum and topic related to your post
Please assure there is not an existing forum and topic related to your post
-
Didneywhorl
- Posts: 3635
- Joined: Fri Mar 23, 2018 5:37 pm
- Location: USA
- Has thanked: 1369 times
- Been thanked: 761 times
- Contact:
Re: EM7455 - 30Mbps down/0.26Mbps up?
Which cellular provider are you using and what plan on that are you using?
What are you signal numbers? RSSI?CSQ?RSRP?RSRQ?
An AT!GSTATUS? output would do wonders to tell info too.
What are you signal numbers? RSSI?CSQ?RSRP?RSRQ?
An AT!GSTATUS? output would do wonders to tell info too.
Re: EM7455 - 30Mbps down/0.26Mbps up?
Provider is Verizon. Here is the output from ModemManager:Didneywhorl wrote: ↑Sun Aug 23, 2020 12:08 pm Which cellular provider are you using and what plan on that are you using?
What are you signal numbers? RSSI?CSQ?RSRP?RSRQ?
An AT!GSTATUS? output would do wonders to tell info too.
Code: Select all
--------------------------------
General | dbus path: /org/freedesktop/ModemManager1/Modem/0
| device id: d3c2e8d7e5a4c5687ab669a594496794d55526e9
--------------------------------
Hardware | manufacturer: Sierra Wireless, Incorporated
| model: EM7455
| revision: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
| h/w revision: 1.0
| supported: gsm-umts, lte
| current: gsm-umts, lte
| equipment id:
--------------------------------
System | device: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-8
| drivers: qcserial, qmi_wwan
| plugin: Sierra
| primary port: cdc-wdm0
| ports: ttyUSB0 (qcdm), ttyUSB2 (at), cdc-wdm0 (qmi),
| cdc-wdm1 (qmi), wwp0s20f0u8i8 (net), wwan1 (net)
--------------------------------
Numbers | own:
--------------------------------
Status | lock: sim-pin2
| unlock retries: sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10)
| state: connected
| power state: on
| access tech: lte
| signal quality: 67% (recent)
--------------------------------
Modes | supported: allowed: 3g; preferred: none
| allowed: 4g; preferred: none
| allowed: 3g, 4g; preferred: 3g
| allowed: 3g, 4g; preferred: 4g
| current: allowed: 3g, 4g; preferred: 4g
--------------------------------
Bands | supported: utran-1, utran-3, utran-4, utran-5, utran-8, utran-2,
| eutran-2, eutran-4, eutran-5, eutran-13
| current: utran-1, utran-3, utran-4, utran-5, utran-8, utran-2,
| eutran-2, eutran-4, eutran-5, eutran-13
--------------------------------
IP | supported: ipv4, ipv6, ipv4v6
--------------------------------
3GPP | imei:
| operator id: 311480
| operator name: Verizon
| registration: home
--------------------------------
3GPP EPS | ue mode of operation: csps-2
--------------------------------
SIM | dbus path: /org/freedesktop/ModemManager1/SIM/0
--------------------------------
Bearer | dbus path: /org/freedesktop/ModemManager1/Bearer/0Code: Select all
!GSTATUS:
Current Time: 952551 Temperature: 74
Reset Counter: 1 Mode: ONLINE
System mode: LTE
AT!LTECA?
Hardware:
LTEB1: B8,
LTEB2: B2, B5, B12, B13, B29,
LTEB3: B7, B20,
LTEB4: B4, B5, B12, B13, B29,
LTEB5: B2, B4, B30,
LTEB7: B3, B7, B20,
LTEB8: B1,
LTEB12: B2, B4, B30,
LTEB13: B2, B4,
LTEB20: B3, B7,
LTEB25:
LTEB26:
LTEB29:
at!band=?
Index, Name, GW Band Mask L Band Mask TDS Band Mask
00, All bands 0002000007C00000 000000000000101A 0000000000000000
01, Europe 3G 0002000000400000 0000000000000000 0000000000000
Re: EM7455 - 30Mbps down/0.26Mbps up?
More info... I finally got the correct output from the terminal session. Here are all the relevant numbers. What is confounding to us though is that the DL speeds are 30+Mbps, but upload never moves off 0.26Mbps. The signal numbers here look terrible, but we have a high gain yagi connected and a laptop tethered to an iphone on the same network gets 5Mbps synchronous.
Code: Select all
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
MEID: A00000AC911DFD
ESN: 12802151217, 8020D331
IMEI:
IMEI SV: 20
FSN: LF015547080310
+GCAP: +CGSM
OK
PRI Part Number: 9909765
Revision: 001.000
Customer: Generic-M2M
Carrier PRI: 9999999_9904780_SWI9X30C_02.33.03.00_00_VERIZON_002.079_001
Carrier PRI: 9999999_9904594_SWI9X30C_02.32.11.00_00_ATT_002.070_000
Carrier PRI: 9999999_9905153_SWI9X30C_02.24.05.06_00_BELL_001.005_000
Carrier PRI: 9999999_9904609_SWI9X30C_02.32.11.00_00_GENERIC_002.064_000
Carrier PRI: 9999999_9905151_SWI9X30C_02.24.03.00_00_ROGERS_001.001_000
Carrier PRI: 9999999_9904779_SWI9X30C_02.32.11.00_00_SPRINT_002.062_000
Carrier PRI: 9999999_9905152_SWI9X30C_02.32.11.00_00_TELUS_001.040_000
Carrier PRI: 9999999_9904930_SWI9X30C_02.24.03.00_00_VODAFONE_001.001_000
OK
!GSTATUS:
Current Time: 1306897 Temperature: 73
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B2 LTE bw: 10 MHz
LTE Rx chan: 1000 LTE Tx chan: 19000
LTE CA state: NOT ASSIGNED
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: Full Srv IMS mode: Normal
PCC RxM RSSI: -85 RSRP (dBm): -112
PCC RxD RSSI: -97 RSRP (dBm): -140
Tx Power: -- TAC: 640E (25614)
RSRQ (dB): -13.4 Cell ID: 0187B52C (25670956)
SINR (dB): 6.6
OK
!LTEINFO:
Serving: EARFCN MCC MNC TAC CID Bd D U SNR PCI RSRQ RSRP RSSI RXLV
1000 311 480 25614 0187B52C 2 3 3 10 448 -12.6 -111.1 -77.0 --
IntraFreq: PCI RSRQ RSRP RSSI RXLV
448 -12.6 -111.1 -77.0 --
InterFreq: EARFCN ThresholdLow ThresholdHi Priority PCI RSRQ RSRP RSSI RXLV
WCDMA: UARFCN ThreshL ThreshH Prio PSC RSCP ECN0 RXLV
OK
+CGDCONT: 1,"IPV4V6","ims","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 2,"IPV4V6","vzwadmin","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 3,"IPV4V6","ne01.VZWSTATIC","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 4,"IPV4V6","vzwapp","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 5,"IPV4V6","vzw800","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 6,"IPV4V6","vzwclass6","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
OK
+CGPADDR: 1,38.0.16.2.17.48.37.80.0.0.0.0.92.235.82.150
OK
+cops: 0,0,"Verizon ",7
OK
+cops: (2,"Verizon ","Verizon ","311480",7),(1,"Extended Network","Extended","310410",2),(3,"311 490","311 490","311490",7),(3,"T-Mobile","T-Mobile","310260",7),(3,"T-Mobile","T-Mobile","310260",2),(1,"Extended Network","Extended","310410",7),(1,"313 100","313 100","313100",7),,(0,1,2,3,4),(0,1,2)Re: EM7455 - 30Mbps down/0.26Mbps up?
RSRP (dBm): -140sam1220 wrote: ↑Thu Aug 27, 2020 3:03 pm More info... I finally got the correct output from the terminal session. Here are all the relevant numbers. What is confounding to us though is that the DL speeds are 30+Mbps, but upload never moves off 0.26Mbps. The signal numbers here look terrible, but we have a high gain yagi connected and a laptop tethered to an iphone on the same network gets 5Mbps synchronous.
That is terrible and likely the cause of it. Compare the RSRP from your iphone by going to field test mode.
1. Turn off your Wi-Fi before beginning
2. Dial *3001#12345#*
3. Press the call button
4. Field test mode menu will show up
5. Go to LTE > Serving Cell Measurements
If it's better than your setup then that's why it's getting 5Mbps UL. My suggestion is try to switch it to the generic firmware with the right config version number associated with it to see if it helps. If not, check the connection of the pigtails going to the modem to see if it's loose or not then try to adjust your yagis and make sure they are not misaligned for polarization too if they are dual yagis.
