# Quectel RM502Q-AE support for LTE bands

Source: https://forum.modalai.com/topic/2227/quectel-rm502q-ae-support-for-lte-bands
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2023-06-06 03:18:54 UTC by IFTEKHAR HASAN
Replies: 4 · Views: 747

## IFTEKHAR HASAN · 2023-06-06 03:18:54 UTC

HI , I have a general question. Our Modal AI VOXL2 has a Quectel RM502Q-AE . Does it only support 5G SA & NSA or can the device connect to LTE band ( B4 for example) ? I noticed that Quectel AT command provides option for both 4G/5G mode preference and datasheet suggested it supports LTE band

echo -ne "AT+QNWPREFCFG=\"mode_pref\",LTE:NR5G\r" | busybox microcom /dev/ttyUSB2

## Reply by Eric Katzfey (ModalAI staff) · 2023-06-06 03:23:43 UTC

@IFTEKHAR-HASAN It supports 3G / 4G / 5G

## Reply by IFTEKHAR HASAN · 2023-06-06 03:58:23 UTC

That's what my understanding is too based on the datasheet. But how do I make the quectel modem only look for LTE . I used below command to set LTE only mode  but it didn't work 

echo -ne "AT+QNWPREFCFG="mode_pref",LTE\r" | busybox microcom /dev/ttyUSB2

Is there any internal configuration or config file that is overriding user command

## Reply by IFTEKHAR HASAN · 2023-06-06 04:25:15 UTC (in reply to IFTEKHAR HASAN)

@IFTEKHAR-HASAN  I also updated the AT command on voxl-modem-start.sh to connect to LTE but I am getting error with AT command as seen in "systemctl status voxl-modem"
![2b8a413b-e709-4986-bc9e-afd2cd668edb-image.png](https://forum.modalai.com/assets/uploads/files/1686025453771-2b8a413b-e709-4986-bc9e-afd2cd668edb-image.png) 

Can you let me know if you see any issue here . or does the AT command has any issue?

## Reply by Eric Katzfey (ModalAI staff) · 2023-06-06 15:44:47 UTC (in reply to IFTEKHAR HASAN)

@IFTEKHAR-HASAN I have used this AT command `at!selrat=06` to force only LTE mode on a Sierra cellular modem in the past.