Question 1

Comparing Cisco Catalyst Switch P vs PF Models: Which PoE Solution Fits You?

Accepted Answer

P models (e.g. C9300L-48P-4G-A) :
ship with a 715 W PSU, giving ~505 W PoE+—good for light-to-moderate PoE needs.

PF models (e.g. C9300L-48PF-4G-A) :
include a 1 100 W PSU, yielding ~890 W PoE+—ideal for full-port PoE+ and future growth.

Choose P to save cost when you won’t power all ports simultaneously; pick PF when you need guaranteed full-port PoE+ capacity.

Question 2

Comparing Cisco Catalyst Switch U vs UB Models

Accepted Answer

U models (e.g. C9300-48U) ：
provide 48 × 1 Gb UPOE ports (up to 60 W each) with Cisco’s standard packet-buffer size—ideal for typical access-layer PoE deployments where traffic bursts are moderate.

UB models (e.g. C9300-48UB):
deliver the same UPOE capabilities but include an extra 64 MB of packet buffer—perfect for high-density or burst-sensitive environments (video, IoT, multicast) where smoothing micro-bursts and preventing drops is critical.

Cisco Equipment Guide

Cisco Switch Naming Convention