# HL6528 CMUX on windows

**URL:** <https://forum.sierrawireless.com/t/hl6528-cmux-on-windows/7714>\
**Category:** Legacy HL Series\
**Created:** [January 26, 2015, 6:11pm UTC](https://forum.sierrawireless.com/t/hl6528-cmux-on-windows/7714 "2015-01-26T18:11:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![okqqkimo1](https://avatars.discourse-cdn.com/v4/letter/o/f1d935/32.png) [@okqqkimo1](https://forum.sierrawireless.com/u/okqqkimo1)\
**Post date:** [January 26, 2015, 6:11pm UTC](https://forum.sierrawireless.com/t/hl6528-cmux-on-windows/7714/1 "2015-01-26T18:11:01Z")

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Hi All,  
I used HL6528 to do ppp connection, but I want send at command.  
I found an “at command” can do it.

Case 1. I can use virtual serial port on linux and I can get IP address by pppd. But I cannot ping 8.8.8.8.  
I already check pppd that can ping 8.8.8.8 without CMUX mode.  
_ **question** _ -\> how to setup at+cmux correctly?

Case 2. Does Sierra have CMUX application on windows? I need to fast check it.

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**Author:** ![Rex\_alex](https://avatars.discourse-cdn.com/v4/letter/r/73ab20/32.png) [@Rex\_alex](https://forum.sierrawireless.com/u/Rex_alex)\
**Post date:** [February 11, 2015, 2:03pm UTC](https://forum.sierrawireless.com/t/hl6528-cmux-on-windows/7714/2 "2015-02-11T14:03:43Z")

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Hi,  
In Linux there is one utility to do MUX. you can download it from the below link.  
[urlhttp://source.sierrawireless.com/resources/sagemcomm2m/hilo/hilo\_and\_hilonc\_mux\_0710\_guidelines\_and\_sources/[/url]

for windows, I don’t think we have any CMUX application.

Thanks,  
Alex