# TCP PAD deep dive

**URL:** <https://forum.sierrawireless.com/t/tcp-pad-deep-dive/34726>\
**Category:** AirLink Routers\
**Created:** [April 18, 2025, 12:18am UTC](https://forum.sierrawireless.com/t/tcp-pad-deep-dive/34726 "2025-04-18T00:18:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aharrison](https://avatars.discourse-cdn.com/v4/letter/a/76d3ee/32.png) [@aharrison](https://forum.sierrawireless.com/u/aharrison)\
**Post date:** [April 18, 2025, 12:18am UTC](https://forum.sierrawireless.com/t/tcp-pad-deep-dive/34726/1 "2025-04-18T00:18:53Z")

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Hello. I want to learn more about TCP PAD mode.

1. What are all the ways you experts in the forum have seen it used? Use cases, examples, and topologies if possible
2. When helping customers set up these use cases, what documentation or steps did you use to make it happen? Any tribal knowledge or learning resources you found helpful?
3. The above applies to both ALEOS and AOS.

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**Author:** ![jerdung](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@jerdung](https://forum.sierrawireless.com/u/jerdung)\
**Post date:** [April 18, 2025, 10:19am UTC](https://forum.sierrawireless.com/t/tcp-pad-deep-dive/34726/2 "2025-04-18T10:19:58Z")

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Hi @aharrison,

You can find information about PAD mode for AOS at: [Configuring Serial Interfaces - XR90-5.1 - Sierra Wireless](https://source.sierrawireless.com/airlinkos/XR90-5.1/reference/hardwareinterfaces/howto/serialconfig/) and for ALEOS in the PAD section of the following document: [https://source.sierrawireless.com/resources/airlink/software\_reference\_docs/airlink-lx-series---configuration-guide/#sthash.ol9PF14I.dpbs](https://source.sierrawireless.com/resources/airlink/software_reference_docs/airlink-lx-series---configuration-guide/#sthash.ol9PF14I.dpbs) (pages 359–363).

Thanks,