D-Link DWR 960 Router: LTE 1800 MHz Network, SINR Parameter Issues and Speed Reductions

Hello,

I use the D-Link 960 DWR router in the LTE 1800 MHz network (external antenna) Plus with public IP (APN: m2m.plusgsm.pl)

The router works correctly for some time, but after a few hours from the restart in the SINR parameter field, instead of the correct value (in my case it is usually 9), a sequence of 8 digits appears and cuts my internet speed to 0.5 Mb / s (download and upload). To restore the correct operation of the router (LTE speeds, which in my case are usually in the range of 20-30 Mb / s), I have to switch the WAN to automatic connection and then manually set the access via the APN indicated above.

I sent the router for a complaint to PLUS, they sent a new one, but the problem still arises.

I updated the software (the latest software available) and still nothing helps.

Do any of you have any idea what could be the reason for this?

I have to find a solution on my own because resending the router for the complaint will probably do nothing .... I do not want to call the IT Plus department either because their only advice will be "please restart the router" ....

SUPPLEMENT:

- LTE H4G MIMO antenna 2x15 dBi 1.8-2.2GHz 2x10m (www.all-ant.pl)
- correct signal parameters - as in the attached photo (they are incorrect only in the SINR field there is some nonsense value)

Check if the DWR-960 is doing the same with APN internet. What is the antenna, what signal parameters?

matek451 wrote:

Check if the DWR-960 is doing the same with APN internet. What is the antenna, what signal parameters?

I wrote the antenna and signal parameters in addition to my post.

As for APN internet, switching from APN m2m.plusgsm.pl solves the topic after some time.

I care about a public IP, so I did not check whether keeping the connection to the "Internet" for a longer period gives the same results.

I would like to add that without an external antenna, the SINR parameter is immediately at the level of e.g. 455466756 dBm (instead of e.g. 0).