# SM's Disconnecting

**URL:** https://community.cambiumnetworks.com/t/sms-disconnecting/48203
**Category:** ePMP
**Created:** [November 14, 2016, 4:51pm UTC](https://community.cambiumnetworks.com/t/sms-disconnecting/48203 "2016-11-14T16:51:01Z")
**Posts on this page:** 1
**Showing post:** 24

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### Author: ![Fedor](https://d10gw3vjmzyp8.cloudfront.net/user_avatar/community.cambiumnetworks.com/fedor/32/20305_2.png) [@Fedor](https://community.cambiumnetworks.com/u/Fedor)
#### Post date: [November 24, 2016, 4:44pm UTC](https://community.cambiumnetworks.com/t/sms-disconnecting/48203/24 "2016-11-24T16:44:49Z")

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Hi,

Please find belov link to KB wjith description of Registration State Codes:

[http://community.cambiumnetworks.com/t5/ePMP-Troubleshooting/Network-Entry-State-Definitions-and-Courses-of-Action/m-p/40712#U40712](https://community.cambiumnetworks.com/t/network-entry-state-definitions-and-courses-of-action/40551)

Communication Lost means the SM cannot be reached by AP polling, resulting in SM disassociation.

Please check RSSI and SNR levels.

Also please check with Spectrum Analyzer tool whether there is any bursty interference on the channel which may cause Radio Link quality degradation.

Thank you.

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