# PMP450 w/5ms frame period and 40MHz carriers

**URL:** https://community.cambiumnetworks.com/t/pmp450-w-5ms-frame-period-and-40mhz-carriers/98211
**Category:** PMP
**Created:** [March 7, 2024, 6:27pm UTC](https://community.cambiumnetworks.com/t/pmp450-w-5ms-frame-period-and-40mhz-carriers/98211 "2024-03-07T18:27:28Z")
**Posts on this page:** 1
**Showing post:** 15

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### Author: ![Eric\_Ozrelic](https://d10gw3vjmzyp8.cloudfront.net/user_avatar/community.cambiumnetworks.com/eric_ozrelic/32/16188_2.png) [@Eric\_Ozrelic](https://community.cambiumnetworks.com/u/Eric_Ozrelic)
#### Post date: [April 15, 2024, 9:35pm UTC](https://community.cambiumnetworks.com/t/pmp450-w-5ms-frame-period-and-40mhz-carriers/98211/15 "2024-04-15T21:35:27Z")

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Yes, this is a very difficult issue to fix, it’s buried deep in the firmware. Delays to the deep vc queue fix were partially because of development work on the Downlink Slot Optimization, work on the interference cancellation features, and 450v development.

And yes, the Downlink Slot Optimization feature was [added in R22.0].([PMP450x Release 22.0 is now available](https://community.cambiumnetworks.com/t/pmp450x-release-22-0-is-now-available/90046))

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