Connection trouble with WE-826-T2 and EM7565

[dan101]

I'm building a WE-826-T2 with a EM7565 modem and I can't get the modem to connect to Sprint using the sim I got from a ZTE Warp connect from Mobile Citizen. I've been following the tutorial and the troubleshooting page for connection issues. Here is a summary of what I've tried (not in order)

1. Used at+cpin? and at+cnum and it returned "ready" and the phone number associated with the account respectively, so I'm assuming it is not an issue with the sim.

2. atgstatus? gives:

PCC RxM RSSI: -89
PCC RxD RSSI: -66
PCC RxM RSRP: -123
PCC RxD RSRP:-98

My understanding is that this means the signal is poor, correct? But would these values cause the modem not to connect at all? I used my phone in the same location as the router and I got 12 Mb/s download speed on the Google Fi phone plan. I used the Signal Spy app to confirm that the phone is connected to Sprint, Band 41.

3. I tried to reset the modem to OEM settings using

at!entercnd="A710"
at!RMARESET=1
at!reset

However, I get "TIMEOUT ERROR" after issuing the at!RMARESET=1 command.

4. I confirmed the modem firmware is the latest generic version using the ATI command. It lists SWI9X50C_01.08.04.00

5. I verified the apn is set to r.ispsn per the web interface of the zte warp connect.

6. Note that I am using the upgraded 2.5 amp power adapter that was recommended

I'd appreciate any pointers. Thank you

[JimHelms]

Notice the large difference between the RxM (Main modem port) and the RxD (AUX modem port).

I would first check to make sure the MHF4 connector has not popped off, or grounding against the screw head or metal portion of the modem.

I would then program in Band 41 and lock to that band as well as program in the APN:

Code: Select all

at!entercnd="A710"
at+cgdcont=1,"ipv4v6","r.ispsn"
at!band=0a,"b41",0,10000000000
at!band=0a
at!reset

[dan101]

Thanks for your help!

I opened the router and found that a pigtail was disconnected (I think I might not have had it attached right to begin with). I reattached it, and then issued the commands you suggested to set the apn and lock onto band 41. After doing that, the modem is able to connect to the sprint network.

Unfortunately, I'm getting very slow speeds. From inside my apartment, I get about 16 Mb/s on my phone when connected to Sprint Band 41. With the EM7565, it is only able to load web pages intermittently. I get the following at!gstatus message:

Code: Select all

Current Time:  205Temperature: 37
Reset Counter: 1Mode:        ONLINE        
System mode:   LTE        PS state:    Attached    
LTE band:      B41    LTE bw:      20 MHz 
LTE Rx chan:   40978LTE Tx chan: 40978
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:  -90PCC RxM RSRP:  -128
PCC RxD RSSI:  -72PCC RxD RSRP:  -104
Tx Power:      22TAC:         5106 (20742)
RSRQ (dB):     -12.6Cell ID:     0a208103 (169902339)
SINR (dB):      7.0

For the ultimate test, I ran an extension cord outside to a spot where I get 60-70 Mb/s on my phone via sprint band 41. On the EM7565 I was only able to get 4-5 MB/s. When I have the router/modem at that location, I get the following at!gstatus message:

Code: Select all

Current Time:  574Temperature: 45
Reset Counter: 1Mode:        ONLINE        
System mode:   LTE        PS state:    Attached    
LTE band:      B41    LTE bw:      20 MHz 
LTE Rx chan:   40978LTE Tx chan: 40978
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:  -91PCC RxM RSRP:  -122
PCC RxD RSSI:  -62PCC RxD RSRP:  -86
Tx Power:      --TAC:         5106 (20742)
RSRQ (dB):     -8.1Cell ID:     0a208103 (169902339)
SINR (dB):     25.2

Do you have any suggestions? Should I try using new pigtails? Honestly, it was extremely frustrating getting them on in the first place, but obviously I'll try it if that's my best bet.

Thanks again!

[JimHelms]

You still have something not right on the MAIN modem connector port.

My best guess is that your MHF4 connector is bad and/or not making a good connection.

Yes, they can be very frustrating to work with. I use a magnifying glass with a light in it.

I also use a wooden chop stick that is sanded perfectly flat on the end to help snap the connector onto the modem.

[Frankhah]

good day.
Im new here and 67 years old.

Who can give me please times a program design for EASy68K
which one has a connection with RS232 and 9600 baud?

Thank you.
greeting

[dan101]

Jim, just wanted to say thanks for the help and to update the post for anyone trying to troubleshoot their own problem. I installed a new pigtail connector and it seems to be working. The main and aux signals are very close as shown below. Speeds vary between 5-10 Mbps indoors, so I think the next step may be to buy an antenna.

PCC RxM RSSI: -77PCC RxM RSRP: -106
PCC RxD RSSI: -78PCC RxD RSRP: -106

Thanks again