Edca Parameters; Dfs (802.11H) - Cisco 9971 Deployment Manual

Unified ip phone wireless lan deployment guide

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EDCA Parameters

Set the EDCA profile for "Voice Optimized" and disable "Low Latency MAC" for either 5 or 2.4 GHz depending on which

band is to be utilized.

Low Latency MAC (LLM) reduces the number of retransmissions to 2-3 per packet depending on the access point platform, so

it can cause issues if multiple data rates are enabled.

LLM is not supported on the Cisco 802.11n access points.

In the DFS (802.11h) configuration, channel announcement and quite mode should be enabled.

Power constraint should be left un-configured or set to 0 dBm as DTPC will be used by the Cisco Unified IP Phone 9971 to

control the transmission power.

In later versions of the Cisco Unified Wireless LAN Controller it does not allow both TPC (Power Constraint) and DTPC

(Dynamic Transmit Power Control) to be enabled simultaneously.

Cisco Unified IP Phone 9971 Wireless LAN Deployment Guide

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