# Cascades — request to Vertical (Richard Turner): set Poly handsets to 5 GHz-only

- **Date:** 2026-06-19
- **To:** Richard Turner <RTurner@vertical.com> (Vertical, VoIP vendor)
- **From:** Howard Enos, Arizona Computer Guru
- **Why:** After the RF optimization, the residual dropped-call/audio issues are handsets stuck on
  saturated 2.4 GHz despite strong 5 GHz-capable signal (band-selection problem, not coverage).
  Controller-side band steering is on but not holding the Poly fleet on 5 GHz -> need a phone-side
  5 GHz band lock. Evidence: handsets on 2.4 at -50 to -60 dBm showing 36-96% retransmission vs <10%
  for handsets on 5 GHz. Poly OUI 48:25:67.

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To: Richard Turner <RTurner@vertical.com>
Subject: Cascades — set Poly handsets to 5 GHz-only

Richard,

We've finished optimizing the WiFi at Cascades. 5 GHz is now clean (2-3% utilization); 2.4 GHz is
saturated at 84-91% and isn't usable for voice at this site.

The remaining dropped-call/audio issues are all handsets that are sitting on 2.4 GHz despite a strong
5 GHz-capable signal — some at -50 dBm showing 36-96% packet retransmission, versus under 10% for the
phones on 5 GHz. It's a band-selection problem, not coverage.

Please set the Poly WiFi handsets at Cascades to 5 GHz only (disable the 2.4 GHz band in provisioning)
so they can't fall back to 2.4.

Let me know when it's pushed and I'll confirm they re-home to 5 GHz from our side.

Thanks,
Howard Enos
Arizona Computer Guru
