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DTPC on Autonomous AP

Hello,

I can't seem to get DTPC working on an Autonomous AP.

AP 1240 2.4Ghz radio running 12.4(10b)JDA (I didn't find any related bugs in bug toolkit)

Config:

dot11 ssid test

authentication open

guest-mode

admit-traffic

!

dot11 phone dot11e

!

interface Dot11Radio0

ssid test

power local 14

power client 14

channel 2412

station-role root

dot11 qos class voice local

admission-control

admit-traffic narrowband max-channel 75 roam-channel 6

!

dot11 qos class voice cell

admission-control

!

world-mode dot11d country US both

bridge-group 1

I got a 7921 associated phone connected to the callmanager.

AP1240A#show dot11 associations 001e.4a3e.e361

Address : 001e.4a3e.e361 Name : SEP001E4A3EE361

IP Address : 3.45.47.134 Interface : Dot11Radio 0

Device : CP-7921 Software Version : NONE

CCX Version : 4 Client MFP : Off

State : Assoc Parent : self

SSID : test

VLAN : 0

Hops to Infra : 1 Association Id : 2

Clients Associated: 0 Repeaters associated: 0

Tunnel Address : 0.0.0.0

Key Mgmt type : NONE Encryption : Off

Current Rate : 54.0 Capability : WMM ShortHdr ShortSlot 11h

Supported Rates : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0

Voice Rates : disabled

Signal Strength : -51 dBm Connected for : 2942 seconds

Signal to Noise : 42 dB Activity Timeout : 57 seconds

Power-save : On Last Activity : 2 seconds ago

Apsd DE AC(s) : BK BE VI VO

Packets Input : 751 Packets Output : 674

Bytes Input : 47227 Bytes Output : 53088

Duplicates Rcvd : 0 Data Retries : 75

Decrypt Failed : 0 RTS Retries : 1

MIC Failed : 0 MIC Missing : 0

Packets Redirected: 0 Redirect Filtered: 0

On the phone I go to: Settings > Device Information > WLAN > TX Power is 5 dBm, I would expect it to be at 14dBm

AP1240A#show controllers d0

!

interface Dot11Radio0

...

Configured CCK Power: 14 dBm

Configured OFDM Power: 14 dBm

Active power levels by rate

1.0 to 54.0 , 14 dBm

OffChnl Power: 20, Rate 1.0

Allowed CCK Power Levels: -1 2 5 8 11 14 17 20

Allowed OFDM Power Levels: -1 2 5 8 11 14 17 20

Allowed Client Power Levels: 2 5 8 11 14 17 20

I did a Wireshark capture with AirPcap and I'm looking at the advertised beacon:

Tagged parameters

Country Information: Country Code: US, Any Environment

Tag Number: 7 (Country Information)

Tag length: 6

Tag interpretation: Country Code: US, Any Environment

Start Channel: 1, Channels: 11, Max TX Power: 26 dBm <<< shouldn't it be 14 dBm?

this is strange, I'm going to try a different IOS image

2 REPLIES
Hall of Fame Super Gold

Re: DTPC on Autonomous AP

HTML into your AP. Go to Network Interfaces > Click on the Radio > Settings Tab.

Change the settings for CCK Transmitter Power and/or OFDM Transmitter Power.

Hope this helps.

Cisco Employee

Re: DTPC on Autonomous AP

The 7921 phone can throttle back the tx power if the current rx signal is strong. This is an algorithm to prevent unnecessary noise in other areas and to conserve the battery.

You can see that you have a strong signal.

Signal Strength : -51 dBm Connected for : 2942 seconds

Try stepping a bit away from the AP (i.e. -67 dBm) and you should see the correct value.

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