WG3526 and MC7455B vs EM7565

[yumbrad]

Hi! I have been using an The Wireless Haven WG3526 with AT&T, initially with an EM7455B that I ordered off eBay and then flashed to a newer generic firmware. With this modem in my current location, I can get 50-60 mpbs down and 20-30 mbps up. This is what this sort of connection looks like:

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!GSTATUS: 
Current Time:  657		Temperature: 41
Reset Counter: 3		Mode:        ONLINE         
System mode:   LTE        	PS state:    Attached     
LTE band:      B4     		LTE bw:      20 MHz  
LTE Rx chan:   2050		LTE Tx chan: 20050
LTE CA state:  INACTIVE    		LTE Scell band:B12    
LTE Scell bw:10 MHz  		LTE Scell chan:5110
EMM state:     Registered     	Normal Service 
RRC state:     RRC Connected  
IMS reg state: No Srv  		

PCC RxM RSSI:  -80		RSRP (dBm):  -106
PCC RxD RSSI:  -78		RSRP (dBm):  -104
SCC RxM RSSI:  -75		RSRP (dBm):  -99
SCC RxD RSSI:  -78		RSRP (dBm):  -104
Tx Power:      -5		TAC:         291D (10525)
RSRQ (dB):     -10.9		Cell ID:     01477A16 (21461526)
SINR (dB):     14.2

I wanted to try improving my speeds, so I ordered an MC7565 from The Wireless Haven. Popping this in the router, it seems to consistently get slower speeds, and never seems to do CA. Also, AT!LTECA? works when I have the EM7455 in, but resets the modem when I run it with the MC7565.

What might be the issue here? Could it be a firmware version problem? Do I need to upgrade the MC7565?

Thank you!

[bjames]

Can you post the return of the AT!GSTATUS? for the EM7565. That will give everyone something to work from.

[yumbrad]

Yes. I'll do that when I get home. Has anyone heard of "AT!LTECA?" (either after or before AT!ENTERCND="A710") crashing a modem? What is the best command to determine what firmware the MC7565 is running?

[Didneywhorl]

AT+GMR for currently installed firmware

Do you have a copy of the AT command guide for the EM7565? If not they are available on the Sierra Wireless website.

I've not heard of any regular commands causing a crash of the modem. BUT I don't have one of them either.

[JimHelms]

Run the AT Commands post the returns:

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ATI

and, xxx out your IMEI and MEID numbers, then run:

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AT!IMPREF?

[yumbrad]

Ok, was able to run all these commands on both modems. Today, the 7565 is getting pretty good speeds on B66, which the 7455 doesn't seem to be able to use. But it wasn't doing CA until a reboot. When I do one band at a time, B66 and B4 are definitely the fastest, followed by B2 and then B12... so it would be nice to use 4 and 66 if possible! But any tips on changes I can make to improve things are welcome. Below are the results of GSTATUS, ATI, and IMPREF for both modems.

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==================================
  EM7455
==================================
ATI
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455B
Revision: SWI9X30C_02.24.05.06 r7040 CARMD-EV-FRMWR2 2017/05/19 06:23:09
MEID: xxx
IMEI: xxx
IMEI SV: 12
FSN: LF828321030110
+GCAP: +CGSM

!IMPREF:
preferred fw version:    02.24.05.06
preferred carrier name:  GENERIC
preferred config name:   GENERIC_002.026_000
current fw version:      02.24.05.06
current carrier name:    GENERIC
current config name:     GENERIC_002.026_000

!GSTATUS:
Current Time:  152691       Temperature: 36
Reset Counter: 3                         Mode:        ONLINE
System mode:   LTE                       PS state:    Attached
LTE band:      B4                        LTE bw:      20 MHz
LTE Rx chan:   2050                      LTE Tx chan: 20050
LTE CA state:  INACTIVE                  LTE Scell band:B12
LTE Scell bw:10 MHz                      LTE Scell chan:5110
EMM state:     Registered                Normal Service
RRC state:     RRC Connected
IMS reg state: No Srv

PCC RxM RSSI:  -75      RSRP (dBm):  -107
PCC RxD RSSI:  -79      RSRP (dBm):  -105
SCC RxM RSSI:  -75      RSRP (dBm):  -99
SCC RxD RSSI:  -77      RSRP (dBm):  -101
Tx Power:      2        TAC:         291D (10525)
RSRQ (dB):     -9.4     Cell ID:     01477A16 (21461526)
SINR (dB):      9.8

=======================================
   EM7565
=======================================
ATI
Manufacturer: Sierra Wireless, Incorporated
Model: EM7565
Revision: SWI9X50C_01.08.04.00 dbb5d0 jenkins 2018/08/21 21:40:11
IMEI: xxx
IMEI SV:  8
FSN: UF921271970215
+GCAP: +CGSM

!IMPREF:
 preferred fw version:    01.08.04.00
preferred carrier name:  GENERIC
preferred config name:   GENERIC_002.011_000
current fw version:      01.08.04.00
current carrier name:    GENERIC
current config name:     GENERIC_002.011_000

!GSTATUS:
Current Time:  292      Temperature: 37
Reset Counter: 1                     Mode:        ONLINE
System mode:   LTE                   PS state:    Attached
LTE band:      B66                   LTE bw:      20 MHz
LTE Rx chan:   0                     LTE Tx chan: 132072
LTE SSC1 state:NOT ASSIGNED
LTE SSC2 state:NOT ASSIGNED
LTE SSC3 state:NOT ASSIGNED
LTE SSC4 state:NOT ASSIGNED
EMM state:     Registered       Normal Service
RRC state:     RRC Connected
IMS reg state: No Srv

PCC RxM RSSI:  -67      PCC RxM RSRP:  -100
PCC RxD RSSI:  -66      PCC RxD RSRP:  -104
Tx Power:      --       TAC:         291d (10525)
RSRQ (dB):     -8.9     Cell ID:     01477a16 (21461526)
SINR (dB):      6.6

!GSTATUS: (after a reboot)
!GSTATUS:
Current Time:  161      Temperature: 41
Reset Counter: 2        Mode:        ONLINE
System mode:   LTE          PS state:    Attached
LTE band:      B66          LTE bw:      20 MHz
LTE Rx chan:   0        LTE Tx chan: 132072
LTE SSC1 state:INACTIVE     LTE SSC1 band: B12
LTE SSC1 bw  : 10 MHz       LTE SSC1 chan: 5110
LTE SSC2 state:NOT ASSIGNED
LTE SSC3 state:NOT ASSIGNED
LTE SSC4 state:NOT ASSIGNED
EMM state:     Registered       Normal Service
RRC state:     RRC Connected
IMS reg state: No Srv

PCC RxM RSSI:  -73      PCC RxM RSRP:  -101
PCC RxD RSSI:  -74      PCC RxD RSRP:  -106
SCC1 RxM RSSI: -79      SCC1 RxM RSRP: -100
SCC1 RxD RSSI: -79      SCC1 RxD RSRP: -102
Tx Power:      --       TAC:         291d (10525)
RSRQ (dB):     -9.0     Cell ID:     01477a16 (21461526)
SINR (dB):      8.0