# High Latency link

**URL:** <https://discuss.px4.io/t/high-latency-link/13917>\
**Category:** QGroundControl\
**Created:** [November 18, 2019, 4:34pm UTC](https://discuss.px4.io/t/high-latency-link/13917 "2019-11-18T16:34:41Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![AlexandreBorowczyk](https://discuss.px4.io/user_avatar/discuss.px4.io/alexandreborowczyk/32/12383_2.png) [@AlexandreBorowczyk](https://discuss.px4.io/u/AlexandreBorowczyk)\
**Post date:** [November 18, 2019, 4:34pm UTC](https://discuss.px4.io/t/high-latency-link/13917/1 "2019-11-18T16:34:41Z")

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Quick question,

Lets say I’m getting interference on my telemetry radio link which reduce the available bandwidth.  
I would then like to switch to the the high latency Mavlink stream. What the right way of doing this using QGC?

Also does that make sense?

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**Author:** ![DonLakeFlyer](https://discuss.px4.io/user_avatar/discuss.px4.io/donlakeflyer/32/3036_2.png) [@DonLakeFlyer](https://discuss.px4.io/u/DonLakeFlyer)\
**Post date:** [November 18, 2019, 5:22pm UTC](https://discuss.px4.io/t/high-latency-link/13917/2 "2019-11-18T17:22:30Z")

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> [@AlexandreBorowczyk](#):
>
> Also does that make sense?

Not really. You don’t “switch” to a high latency link. It’s a type of link like a satellite link.

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**Author:** ![AlexandreBorowczyk](https://discuss.px4.io/user_avatar/discuss.px4.io/alexandreborowczyk/32/12383_2.png) [@AlexandreBorowczyk](https://discuss.px4.io/u/AlexandreBorowczyk)\
**Post date:** [November 18, 2019, 9:31pm UTC](https://discuss.px4.io/t/high-latency-link/13917/3 "2019-11-18T21:31:55Z")

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Oh ok!!!  
I guess I got confused with the “minimal mode”. Can you which for normal to minimal mode on the fly?  
Also, so how does the high Latency mode differ from the others?

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**Author:** ![acfloria](https://discuss.px4.io/user_avatar/discuss.px4.io/acfloria/32/1568_2.png) [@acfloria](https://discuss.px4.io/u/acfloria)\
**Post date:** [November 20, 2019, 8:32am UTC](https://discuss.px4.io/t/high-latency-link/13917/4 "2019-11-20T08:32:18Z")

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There are a few differences. The ones I recall are:

- You don’t send heartbeats through from QGC to the plane
- The timeout on receiving a heartbeat, which can also be a HIGH\_LATENCY2 message, from the plane is increased
- You cannot synch/modify params and missions using this link
- If there are multiple links connected to QGC then the low latency links are preferred

This high latency link was mainly targeted to satellite communication where you experience latency ranging from 5-30 seconds and the bandwidth is very limited.

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**Author:** ![AlexandreBorowczyk](https://discuss.px4.io/user_avatar/discuss.px4.io/alexandreborowczyk/32/12383_2.png) [@AlexandreBorowczyk](https://discuss.px4.io/u/AlexandreBorowczyk)\
**Post date:** [November 20, 2019, 1:09pm UTC](https://discuss.px4.io/t/high-latency-link/13917/5 "2019-11-20T13:09:53Z")

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Oh ok thanks very much!