CIsco AIR-SAP1602E - transmitter power error

[dimitrihofman]

Hi,

Because of end-of-life of the wireless AP 1140 series, we decided to switch to the 1600 series.

We have now several AIR-SAP-1602E devices which show the same behaviour:

On the web interface, there is an error indicated for the transmitter power (see screenshot attached).

Question: Is this a known issue (bug in the interface?,...) or is there actually something wrong.

Output power is measured to be about 3db lower than compared with the 1142.

Attached are the supported dual band Cisco Antenna's.

Regards,

Dimitri Hofman

[Amjad Abdullah]

Hi,

what is the status of the interface?

please issue "show interface dot11radio1 ) output here to see.

How do you power your APs?

is this issue happenign with all APs?

Regards,

Amjad

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[dimitrihofman]

Dear Amjad,

Thank you for replying.

The problem occurs on all AP's.

The AP's are powered via a power injector PWRINJ4 from Cisco.

Not sure what you mean by the interface status? I attached another screenshot, hope this is what you want to see.

Regards,

Dimitri Hofman

[Amjad Abdullah]

I means to show us the "show interfaces" output from CLI.

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[dimitrihofman]

Dear Amjad,

Hereby the interface status from the command line. Hope this give you a clue on what might be wrong.

Regards,

Dimitri Hofman

[Abhishek Abhishek]

Hello,

As per your query i can suggest you the following data sheet-

Maximum Total Transmit Power

2.4 GHz

• 802.11b

• 22 dBm (3 antennas enabled)

• 802.11g

• 22 dBm (3 antennas enabled)

• 802.11n (HT20)

• 22 dBm (3 antennas enabled)

5 GHz

• 802.11a

• 22 dBm (3 antennas enabled)

• 802.11n non-HT duplicate mode

• 22 dBm (3 antennas enabled)

• 802.11n (HT20)

• 22 dBm (3 antennas enabled)

• 802.11n (HT40)

• 22 dBm (3 antennas enabled)

Hope this will help you.

[theunert1]

Hello,

is there any solution for now? I got the same issue..

Here is my running-config for the interface radio1

interface Dot11Radio1
 no ip address
 !
 encryption mode ciphers aes-ccm
 !
 ssid MYSSID
 !
 antenna gain 128
 no dfs band block
 stbc
 beamform ofdm
 speed  basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48                                                          .0 basic-54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m                                            15.
 power local maximum
 channel dfs
 station-role root
 bridge-group 1
 bridge-group 1 subscriber-loop-control
 bridge-group 1 spanning-disabled
 bridge-group 1 block-unknown-source
 no bridge-group 1 source-learning
 no bridge-group 1 unicast-flooding

[Saurav Lodh]

For output power related issues, refer

https://supportforums.cisco.com/docs/DOC-13181

[dimitrihofman]

Hi,

Tried several actions using the CLI. What I can see is that the AP is accepting the CLI commands and is executing them correctly.

This leads me to conclude that the webinterface is buggy.

- The web interface continues to show an error for the transmitter power.

- The web interface does not allow you to select a single channel on 5 Ghz(only DFS is possible)

For my application, I really need to be able to rely on the web interface as these AP's will be used worldwide by service engineers which are not so knowledgeable with WiFi.

Does anyone know of a fix from Cisco?

Regards,

Dimitri

[Amjad Abdullah]

Hi Dmitri,

Just a question on the side, are you really using an antenna gain with 128 dBi?

This is what is configured under your radio as per your colleagues:

antenna gain 128

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[dimitrihofman]

Hi Amjad,

No, I use the standard dual band antenna from Cisco. Gain is 2 dBi for 2.4Ghz and 4 dBi for 5 GHz.

I have configured this so in the AP.

The config that Sven posted is not from my AP (but has indeed an antenna gain of 128dBi which cannot be correct?)

It is strange that Cisco has not yet picked up on this interface issue. I would expect that not able to work the Access Point on a fixed channel is a serious problem.

Regards,

Dimitri