# 4600L/4625 short clean link performance issues at 160mhz **URL:** \ **Category:** ePMP\ **Created:** [November 29, 2025, 1:40am UTC](https://community.cambiumnetworks.com/t/4600l-4625-short-clean-link-performance-issues-at-160mhz/107614 "2025-11-29T01:40:16Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![terintamel](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/t/a6a055/32.png) [@terintamel](https://community.cambiumnetworks.com/u/terintamel)\ **Post date:** [November 29, 2025, 3:35pm UTC](https://community.cambiumnetworks.com/t/4600l-4625-short-clean-link-performance-issues-at-160mhz/107614/4 "2025-11-29T15:35:28Z")
I do hope Cambium is still working on optimizing 80mhz and 160mhz channel sizes for TDD PtMP. On 40mhz I can easily get almost 400Mbps down, but at 80mhz I usually only see around 600Mbps to a single SM in PtMP TDD 75/25 mode. So double the channel size for only 50% more bandwidth. I know a wider channel will get more noise and will not translate to a 100% increase in performance, but I guess I would expect at least an 70-80% increase over 40mhz. It could be an issue with the 4625 SM’s processing power as the AP seems to get closer to Cambium’s estimates when doing multi-SM link tests even without MU-MIMO. This is well below Cambium’s own estimates via the [ePMP Capacity Planning Tool](https://www.cambiumnetworks.com/epmpcapacityplanner/) which shows 80mhz should be near 800Mbps or more. [ePMP 4k - 80mhz performance bottleneck - Products / ePMP - Cambium Community](https://community.cambiumnetworks.com/t/epmp-4k-80mhz-performance-bottleneck/102094) --- _[View the full topic](https://community.cambiumnetworks.com/t/4600l-4625-short-clean-link-performance-issues-at-160mhz/107614)._