Dynamic Transmit Power Control (Dtpc) - Cisco 7925G Series Deployment Manual

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The number of calls may vary depending on the data rate, initial channel utilization, and the environment.

Max # of Streams

When using Coexistence (802.11b/g + Bluetooth), call capacity is reduced to the following:

Max # of Streams

Note: It is highly recommended to use 802.11a if using Bluetooth.

Prior to release 1.3(3), only 2 bi-directional RTP streams were supported when using Coexistence.

Dynamic Transmit Power Control (DTPC)

To successfully exchange packets between the wireless IP phone and the access point, Dynamic Transmit Power Control

(DTPC) should be enabled.

When using an access point that supports DTPC, set the client power to match the local access point power.

Do not use default setting of Max power for client power on Cisco autonomous access points as that will not advertise DTPC to

the client.

If the access point does not support DTPC, then the Cisco Unified Wireless IP Phone 7925G Series will use the highest

available transmit power depending on the current 802.11 mode and data rate.

The transmit power on the Cisco Unified Wireless IP Phone 7925G Series can also optionally be configured to match the

highest transmit power of an access point in the wireless LAN. This setting prevents one-way audio when RF traffic is heard in

one direction only.

By default the Cisco Unified Wireless IP Phone 7925G Series will use the highest available transmit power by default (i.e. 17

dBm / 50 mW for 2.4 GHz and 16 dBm / 40 mW for 5 GHz).

The access point's radio transmit power should not have a transmit power greater than what the Cisco Unified Wireless IP

Phone 7925G Series can support.

Cisco Unified Wireless IP Phone 7925G Series Deployment Guide

802.11 Mode

802.11a or 802.11g + Bluetooth Disabled

802.11 Mode

802.11b/g + Bluetooth Enabled

802.11g + Bluetooth Enabled

Data Rate

6 Mbps

12 Mbps

24 – 54 Mbps

Data Rate

11, <12-54> Mbps

12, <18-54> Mbps

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