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jbird
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Sierra Wireless MC7750 on Verizon Wireless

Sat Jun 24, 2017 12:55 am

I am trying to set up a Sierra Wireless MC7750 on a RouterBoard RB912 to connect to Verizon Wireless 4G LTE in the United States. It doesn't work via the LTE interface in RouterOS, but I'm able to intermittently use it with a PPP client.

When it works, my ppp-out1 interface status shows a local address of 100.x.x.x, remote address is blank, and connect speed is 100000000. I am able to create a NAT rule to masquerade, and I can connect to the ether1 port and browse the Internet.

When it's not working, my ppp-out1 interface shows a local address of 100.x.x.x, but is also shows a remote address of 69.x.x.x, and a connect speed of 3100000. I have no connectivity with the PPP interface in this status.

Sometimes the modem will connect in the faster mode, but later drop to the slower mode, and I lose connectivity.

I haven't found a way to ensure that the ppp client connects at 100000000.

Are there ways to do any of the following things?
1. Configure the PPP interface so that it always connects in the faster mode?
2. Configure the router so that I can gain connectivity in the slower mode?
3. Configure the router so that it provides connectivity regardless of whether the modem is connected in the faster or slower mode?

Are there any Mini PCIe modems that are known to work better on MikroTik with Verizon Wireless?
 
sanitycheck
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Re: Sierra Wireless MC7750 on Verizon Wireless

Sat Jun 24, 2017 4:15 am

Did you check your MC card firmware version? That makes a difference, as is indicated in the Mikrotik supported hardware list. The hardware reference is for the MC7700, which is the ATT version, but I'd guess it is a factor on the MC7750 as well. With a firmware upgrade the card should show up as an LTE device, which should solve all your problems.

You also have to make sure it's in DIP mode, not QMI mode. I get the idea the card doesn't show up at all if it's in QMI mode, so that may not be an issue for you.
 
jbird
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Re: Sierra Wireless MC7750 on Verizon Wireless

Tue Jun 27, 2017 11:38 pm

I upgraded the MC card firmware version and tried again. MikroTik recommended firmware 3.5.23.2 for the MC7700, but the newest firmware that I could find for the MC7750 was 3.5.10.13, so I upgraded to 3.5.10.13. It still doesn't show up as an LTE device. I haven't figured out how to determine whether or not the modem is in DIP Mode. In another post, someone mentioned to set "/port firmware ignore-direct-ip-modem=yes" in order to make sure the modem works on a PPP interface. I did this, and it didn't seem to make a difference.

However, I went to lunch and when I came back, I had connectivity for about an hour. In the log, I noticed that there was an entry that said "ppp-out1: could not determine remote address. Using 10.112.112.132."
I have connectivity when the PPP client doesn't list a remote address in the ppp-out1 interface status and instead "Uses" a 10.112.112.x address according to the log. I have no connectivity when a remote address is listed in PPP status.

The PPP client dropped after about an hour. The log repeatedly said:
async, ppp, info ppp-out 1: initializing modem
async, ppp, info ppp-out1: dialing out

The PPP client reconnected after about 10 minutes. I have connectivity. The log now says "ppp-out1: could not determine remote address. Using 10.112.112.135." The "Local address" in PPP Status is 100.91.15.4. "Remote address" is blank.

/IP addresses shows:
Address Network Interface
100.91.15.4 10.112.112.135 ppp-out1

Any ideas as to what's going on with this? If I can find a way to make the PPP client consistently connect in the manner that provides connectivity, this modem will be a viable solution.
 
sanitycheck
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Re: Sierra Wireless MC7750 on Verizon Wireless

Tue Jun 27, 2017 11:51 pm

The firmware issue Mikrotik mentioned might have only applied to the 7700 ATT version, but it was a good idea to upgrade anyway.

The only link I know for the DIP/QMI switcher is: www hptouchpad4g com / sierra.html
 
sanitycheck
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Re: Sierra Wireless MC7750 on Verizon Wireless

Sat Jul 22, 2017 11:24 pm

Interested to hear if you got the 7750 to run as an LTE device.
 
jbird
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Re: Sierra Wireless MC7750 on Verizon Wireless

Fri Sep 22, 2017 5:43 pm

We never got it to work. I contacted MikroTik support via e-mail and sent them a supout, and they replied back and said that this looks like a compatibility issue with the modem's firmware. I'm testing a couple of different modems now - a Quectel EC25-V and an EC21-V. So far, the EC25-V isn't working at all, and the EC21-V is working via PPP client. I started a new thread yesterday for help with the EC25-V, but so far no one has responded:

viewtopic.php?f=2&t=125890&p=619702&hil ... +V#p619702
 
sanitycheck
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Re: Sierra Wireless MC7750 on Verizon Wireless

Fri Sep 22, 2017 6:02 pm

Since your original message I noticed an update for the 7750 in the 6.41RC changelog:
ppp - added support for Sierra MC7750, Verizon USB730L;
PPP not LTE, unfortunately, and I'm not exactly sure what USB730L references. But maybe it means you can get your 7750 working with PPP at least.

Also, if you didn't already, try the program I listed earlier for the DIP/QMI switcher. I assume it wouldn't work at all if in QMI mode, but you never know.
 
jbird
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Re: Sierra Wireless MC7750 on Verizon Wireless

Sat Sep 23, 2017 12:38 am

Thank you. I'll give it a try on 6.41RC. I'm pretty sure I was in DIP mode before, but that's also worth another look.
 
jbird
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Re: Sierra Wireless MC7750 on Verizon Wireless

Wed Sep 27, 2017 6:23 pm

I tried the Sierra Wireless MC7750 on RouterOS 6.40.3 and 6.41rc32. It works on both of these RouterOS versions, but it connects at a slower rate than the Quectel EC21-V.

RouterOS shows a connect speed of 3100000 with the Sierra Wireless, and 150000000 for the Quectel. I ran speed tests at testmy.net. The Sierra Wireless barely exceeded 1 MBps download and 512 KBps upload. The Quectel averaged about 3MBps upload and download. I had the similar results at a different physical location and with an outdoor antenna.

Any ideas as to how to get a faster data rate with these modems on a RouterOS PPP client? They're both capable of higher data rates than what I'm getting.

So far, the Quectel EC21-V is the winner.

I had no success at all with the Quectel EC25-V.
 
jrpaz
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Re: Sierra Wireless MC7750 on Verizon Wireless

Mon Dec 18, 2017 3:07 pm

Try running at+qcfg="usbnet",1 on the EC25-V to allow it to go to ECM mode AKA LTE interface.

It worked for me and I have it running with my wAP-R I get about 15/5 Mbps up/down

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