Cisco Aironet 1552 SA - EIRP

Answered Question
Mar 6th, 2014
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Hi All

Currently, i have a cisco AIR 1552SA with Controller 5508

as datasheet of cisco AIR 1552SA :

+ 802.11b maximum transmit power - 28dbm with 2 antennas

+ three Cisco AIR-ANT2547V-N-HZ antennas dual-band, omnidirectional, stick antennas with 4dbi ( 2.4Ghz ) and 7 dbi ( 5Ghz )

If you set 802.11b, EIRP ( 2,4Ghz ) = 28dbm + 4 dbi = 32 dbm correct ?

i show advance 802.11b in wirless controller

=> just 802.11b is 15 dbm

now, i want to config WLC to set maximum transmit power to AIR 1552SA ( 32dbm )

pls help me

Thanks

Correct Answer by Sandeep Choudhary about 3 years 5 months ago

HI Nguyen,


Here is my other AP with external antenna:


(WLAN1) >show ap config 802.11b AP035




    Tx Power

      Num Of Supported Power Levels ............. 7

      Tx Power Level 1 .......................... 17 dBm

      Tx Power Level 2 .......................... 14 dBm

      Tx Power Level 3 .......................... 11 dBm

      Tx Power Level 4 .......................... 8 dBm

      Tx Power Level 5 .......................... 5 dBm


--More-- or (q)uit

      Tx Power Level 6 .......................... 2 dBm

      Tx Power Level 7 .......................... -1 dBm

      Tx Power Configuration .................... AUTOMATIC

      Current Tx Power Level .................... 1


    Phy OFDM parameters

      Configuration ............................. AUTOMATIC

      Current Channel ........................... 1

      Extension Channel ......................... NONE

      Channel Width.............................. 20 Mhz

      Allowed Channel List....................... 1,2,3,4,5,6,7,8,9,10,11,12,

        ......................................... 13

      TI Threshold .............................. -50

      Legacy Tx Beamforming Configuration ....... CUSTOMIZED

      Legacy Tx Beamforming ..................... ENABLED

      Antenna Type............................... EXTERNAL_ANTENNA

      External Antenna Gain (in .5 dBi units).... 0

      Diversity.................................. DIVERSITY_ENABLED

      802.11n Antennas

         A....................................... ENABLED

         B....................................... ENABLED

         C....................................... ENABLED

         D....................................... ENABLED


-

So I think you have only 5 power level and the max power you can get is 15dBm for first  2 AP according to regulatery domain.

the 3rd AP which is connected with WLC can have 18 dBm but this all depends on your regulatery domain made APs.

Scott is right, if you need to have good signal the add more APs.


Regards

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Correct Answer by Sandeep Choudhary about 3 years 5 months ago

HI,


As per my exp, it is included with antnna gain.


Check my logs:


(WLAN1) >show advanced 802.11b tx


Leader Automatic Transmit Power Assignment

  Transmit Power Assignment Mode................. OFF

  Transmit Power Update Interval................. 600 seconds

  Transmit Power Threshold....................... -70 dBm

  Transmit Power Neighbor Count.................. 3 APs

  Min Transmit Power............................. -10 dBm

  Max Transmit Power............................. 30 dBm

  Transmit Power Update Contribution............. SNI..

  Transmit Power Assignment Leader............... GKCWLAN1 (10.24.80.1)

  Last Run....................................... 351 seconds ago

  TPC Mode....................................... Version 1

  TPCv2 Target RSSI.............................. -67 dBm

  TPCv2 VoWLAN Guide RSSI........................ -67.0 dBm

  TPCv2 SOP...................................... -85.0 dBm

  TPCv2 Default Client Ant Gain..................   0.0 dBi

  TPCv2 Path Loss Decay Factor...................   3.6

  TPCv2 Search Intensity......................... 10 Iterations




AP Name                          Channel    TxPower       Allowed Power Levels


--More-- or (q)uit

-------------------------------- ---------- ------------- ------------------------

AP015                         *6         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP014                         *1         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP001                         *11        *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP005                         *6         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP011                         *1         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP002                         *1         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP008                         *1         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP020                         *11        *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP007                         *11        *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP013                         *11        *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]


(WLAN1) >show ap config 802.11b AP015


Cisco AP Identifier.............................. 11

Cisco AP Name.................................... AP015

Country code..................................... xxxxxxxxxxxxxxxxxxxxxxx

Regulatory Domain allowed by Country............. 802.11bg:-E     802.11a:-E

AP Country code.................................. xxxxxxxxxxxxxxxxxxxxxxxxx

AP Regulatory Domain............................. -E


AP Model......................................... AIR-CAP2602I-E-K9

AP Image......................................... C2600-K9W8-M

IOS Version...................................... 15.2(2)JA1$

Reset Button..................................... Enabled

AP Serial Number................................. FCZ1729D2TF

AP Certificate Type.............................. Manufacture Installed

AP User Mode..................................... AUTOMATIC

AP User Name..................................... admin

AP Dot1x User Mode............................... Not Configured

AP Dot1x User Name............................... Not Configured

Cisco AP system logging host..................... 255.255.255.255

AP Up Time....................................... 75 days, 22 h 37 m 28 s

AP LWAPP Up Time................................. 75 days, 19 h 08 m 19 s

Join Date and Time............................... Sat Dec 21 15:30:47 2013


Join Taken Time.................................. 0 days, 00 h 00 m 21 s




    Tx Power

      Num Of Supported Power Levels ............. 7

      Tx Power Level 1 .......................... 17 dBm

      Tx Power Level 2 .......................... 14 dBm

      Tx Power Level 3 .......................... 11 dBm

      Tx Power Level 4 .......................... 8 dBm

      Tx Power Level 5 .......................... 5 dBm


--More-- or (q)uit

      Tx Power Level 6 .......................... 2 dBm

      Tx Power Level 7 .......................... -1 dBm

      Tx Power Configuration .................... AUTOMATIC

      Current Tx Power Level .................... 1


    Phy OFDM parameters

      Configuration ............................. AUTOMATIC

      Current Channel ........................... 6

      Extension Channel ......................... NONE

      Channel Width.............................. 20 Mhz

      Allowed Channel List....................... 1,2,3,4,5,6,7,8,9,10,11,12,

        ......................................... 13

      TI Threshold .............................. -50

      Legacy Tx Beamforming Configuration ....... CUSTOMIZED

      Legacy Tx Beamforming ..................... ENABLED

      Antenna Type............................... INTERNAL_ANTENNA

      Internal Antenna Gain (in .5 dBi units).... 8

      Diversity.................................. DIVERSITY_ENABLED

      802.11n Antennas

         A....................................... ENABLED

         B....................................... ENABLED

         C....................................... ENABLED

         D....................................... ENABLED



Check max power per anteena gain:


http://www.cisco.com/c/en/us/td/docs/wireless/access_point/channels/lwapp/reference/guide/lw_chp2/1300_chp.html



More info:


https://supportforums.cisco.com/docs/DOC-12954


Regards

Correct Answer by Sandeep Choudhary about 3 years 5 months ago

Hi Nguyen,


Agree with scott, It depends on the regulatery domain.


Check about the cahnnels and Power level for specific domain:


http://www.cisco.com/c/en/us/td/docs/wireless/access_point/channels/lwapp/reference/guide/lw_chp2/1240_chp.html#wp1044347



Regards

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Scott Fella Thu, 03/06/2014 - 20:52
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TX power depends in the country regulations. From the CLI, issue the following to determine the max TX power:

show advanced 802.11b txpower

Sent from Cisco Technical Support iPhone App

ducnm1234 Thu, 03/06/2014 - 21:40
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Hi Scoot

I am from VietNam.

When i show advanced 802.11b txpowe and result on AIR1552sa is 15dbm

This causes singal streng which is very week. I want to increse txpower

Thanks

Scott Fella Fri, 03/07/2014 - 03:38
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You can't increase power more than what the AP is manufactured for (regulatory domain). If you have weak signal, then you need to add more access points. Looking at your output, 15dbm is your max for that country and the 2.4ghz channel. The max tx power is set for the antenna that Cisco allows you to use. You want to increase EIRP past what the regulations is, then replace the antennas with a 3rd party that has a higher gain. This of course can get you in trouble if in your country they are strict with regulations. 15dbm is the tx power for your radio and not the total EIRP.

Sent from Cisco Technical Support iPhone App

Correct Answer
Sandeep Choudhary Thu, 03/06/2014 - 23:16
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Hi Nguyen,


Agree with scott, It depends on the regulatery domain.


Check about the cahnnels and Power level for specific domain:


http://www.cisco.com/c/en/us/td/docs/wireless/access_point/channels/lwapp/reference/guide/lw_chp2/1240_chp.html#wp1044347



Regards

Dont forget to rate helpful posts

ducnm1234 Fri, 03/07/2014 - 00:29
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AIR-CAP1552SA-E-K9

Log of show advance 802.11b Txpower

Leader Automatic Transmit Power Assignment

  Transmit Power Assignment Mode................. AUTO

  Transmit Power Update Interval................. 600 seconds

  Transmit Power Threshold....................... -70 dBm

  Transmit Power Neighbor Count.................. 3 APs

  Min Transmit Power............................. -10 dBm

  Max Transmit Power............................. 30 dBm

  Update Contribution

    Noise........................................ Enable

    Interference................................. Enable

    Load......................................... Disable

    Device Aware................................. Disable

  Transmit Power Assignment Leader............... Cisco5500 (10.10.2.254)

  Last Run....................................... 351 seconds ago

  Last Run Time.................................. 0 seconds

  TPC Mode....................................... Version 1

  TPCv2 Target RSSI.............................. -67 dBm

  TPCv2 VoWLAN Guide RSSI........................ -67.0 dBm

  TPCv2 SOP...................................... -85.0 dBm

  TPCv2 Default Client Ant Gain..................   0.0 dBi

  TPCv2 Path Loss Decay Factor...................   3.6

  TPCv2 Search Intensity......................... 10 Iterations


--More-- or (q)uit



AP Name                          Channel    TxPower       Allowed Power Levels 

-------------------------------- ---------- ------------- ------------------------

APdca5.f4b8.fa3c                 *6         *1/5 (15 dBm) [15/12/9/6/3/0/0/0]

APdca5.f4b8.f9fc                 *11        *1/5 (15 dBm) [15/12/9/6/3/0/0/0]

AP885a.9288.eac5                 *1         *1/6 (18 dBm) [18/15/12/9/6/3/3/3]

I not sure about Tx Power 15dbm with gain of angtena or not

thanks All

Correct Answer
Sandeep Choudhary Fri, 03/07/2014 - 01:54
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HI,


As per my exp, it is included with antnna gain.


Check my logs:


(WLAN1) >show advanced 802.11b tx


Leader Automatic Transmit Power Assignment

  Transmit Power Assignment Mode................. OFF

  Transmit Power Update Interval................. 600 seconds

  Transmit Power Threshold....................... -70 dBm

  Transmit Power Neighbor Count.................. 3 APs

  Min Transmit Power............................. -10 dBm

  Max Transmit Power............................. 30 dBm

  Transmit Power Update Contribution............. SNI..

  Transmit Power Assignment Leader............... GKCWLAN1 (10.24.80.1)

  Last Run....................................... 351 seconds ago

  TPC Mode....................................... Version 1

  TPCv2 Target RSSI.............................. -67 dBm

  TPCv2 VoWLAN Guide RSSI........................ -67.0 dBm

  TPCv2 SOP...................................... -85.0 dBm

  TPCv2 Default Client Ant Gain..................   0.0 dBi

  TPCv2 Path Loss Decay Factor...................   3.6

  TPCv2 Search Intensity......................... 10 Iterations




AP Name                          Channel    TxPower       Allowed Power Levels


--More-- or (q)uit

-------------------------------- ---------- ------------- ------------------------

AP015                         *6         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP014                         *1         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP001                         *11        *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP005                         *6         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP011                         *1         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP002                         *1         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP008                         *1         *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP020                         *11        *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP007                         *11        *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]

AP013                         *11        *1/7 (17 dBm) [17/14/11/8/5/2/-1/0]


(WLAN1) >show ap config 802.11b AP015


Cisco AP Identifier.............................. 11

Cisco AP Name.................................... AP015

Country code..................................... xxxxxxxxxxxxxxxxxxxxxxx

Regulatory Domain allowed by Country............. 802.11bg:-E     802.11a:-E

AP Country code.................................. xxxxxxxxxxxxxxxxxxxxxxxxx

AP Regulatory Domain............................. -E


AP Model......................................... AIR-CAP2602I-E-K9

AP Image......................................... C2600-K9W8-M

IOS Version...................................... 15.2(2)JA1$

Reset Button..................................... Enabled

AP Serial Number................................. FCZ1729D2TF

AP Certificate Type.............................. Manufacture Installed

AP User Mode..................................... AUTOMATIC

AP User Name..................................... admin

AP Dot1x User Mode............................... Not Configured

AP Dot1x User Name............................... Not Configured

Cisco AP system logging host..................... 255.255.255.255

AP Up Time....................................... 75 days, 22 h 37 m 28 s

AP LWAPP Up Time................................. 75 days, 19 h 08 m 19 s

Join Date and Time............................... Sat Dec 21 15:30:47 2013


Join Taken Time.................................. 0 days, 00 h 00 m 21 s




    Tx Power

      Num Of Supported Power Levels ............. 7

      Tx Power Level 1 .......................... 17 dBm

      Tx Power Level 2 .......................... 14 dBm

      Tx Power Level 3 .......................... 11 dBm

      Tx Power Level 4 .......................... 8 dBm

      Tx Power Level 5 .......................... 5 dBm


--More-- or (q)uit

      Tx Power Level 6 .......................... 2 dBm

      Tx Power Level 7 .......................... -1 dBm

      Tx Power Configuration .................... AUTOMATIC

      Current Tx Power Level .................... 1


    Phy OFDM parameters

      Configuration ............................. AUTOMATIC

      Current Channel ........................... 6

      Extension Channel ......................... NONE

      Channel Width.............................. 20 Mhz

      Allowed Channel List....................... 1,2,3,4,5,6,7,8,9,10,11,12,

        ......................................... 13

      TI Threshold .............................. -50

      Legacy Tx Beamforming Configuration ....... CUSTOMIZED

      Legacy Tx Beamforming ..................... ENABLED

      Antenna Type............................... INTERNAL_ANTENNA

      Internal Antenna Gain (in .5 dBi units).... 8

      Diversity.................................. DIVERSITY_ENABLED

      802.11n Antennas

         A....................................... ENABLED

         B....................................... ENABLED

         C....................................... ENABLED

         D....................................... ENABLED



Check max power per anteena gain:


http://www.cisco.com/c/en/us/td/docs/wireless/access_point/channels/lwapp/reference/guide/lw_chp2/1300_chp.html



More info:


https://supportforums.cisco.com/docs/DOC-12954


Regards

ducnm1234 Fri, 03/07/2014 - 03:33
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Phy OFDM parameters

      Configuration ............................. AUTOMATIC

      Current Channel ........................... 6

      Channel Assigned By ....................... DCA

      Extension Channel ......................... NONE

      Channel Width.............................. 20 Mhz

      Allowed Channel List....................... 1,2,3,4,5,6,7,8,9,10,11,12,

        ......................................... 13

      TI Threshold .............................. -50

      Legacy Tx Beamforming Configuration ....... CUSTOMIZED

      Legacy Tx Beamforming ..................... ENABLED

      Antenna Type............................... EXTERNAL_ANTENNA

      External Antenna Gain (in .5 dBi units).... 0

      Diversity.................................. DIVERSITY_ENABLED

      802.11n Antennas

         A....................................... ENABLED

         B....................................... ENABLED

         C....................................... ENABLED

Hi you

AP use  3 external antenna, each antenna has 4dbi, i see with regulatory domain E, max power is 15dbm

but not EIRP. Because when you plug antenna, signal strength increase more.

pls take a look highlight, i dont understand   External Antenna Gain (in .5 dBi units).... 0

Thanks

Correct Answer
Sandeep Choudhary Fri, 03/07/2014 - 05:28
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HI Nguyen,


Here is my other AP with external antenna:


(WLAN1) >show ap config 802.11b AP035




    Tx Power

      Num Of Supported Power Levels ............. 7

      Tx Power Level 1 .......................... 17 dBm

      Tx Power Level 2 .......................... 14 dBm

      Tx Power Level 3 .......................... 11 dBm

      Tx Power Level 4 .......................... 8 dBm

      Tx Power Level 5 .......................... 5 dBm


--More-- or (q)uit

      Tx Power Level 6 .......................... 2 dBm

      Tx Power Level 7 .......................... -1 dBm

      Tx Power Configuration .................... AUTOMATIC

      Current Tx Power Level .................... 1


    Phy OFDM parameters

      Configuration ............................. AUTOMATIC

      Current Channel ........................... 1

      Extension Channel ......................... NONE

      Channel Width.............................. 20 Mhz

      Allowed Channel List....................... 1,2,3,4,5,6,7,8,9,10,11,12,

        ......................................... 13

      TI Threshold .............................. -50

      Legacy Tx Beamforming Configuration ....... CUSTOMIZED

      Legacy Tx Beamforming ..................... ENABLED

      Antenna Type............................... EXTERNAL_ANTENNA

      External Antenna Gain (in .5 dBi units).... 0

      Diversity.................................. DIVERSITY_ENABLED

      802.11n Antennas

         A....................................... ENABLED

         B....................................... ENABLED

         C....................................... ENABLED

         D....................................... ENABLED


-

So I think you have only 5 power level and the max power you can get is 15dBm for first  2 AP according to regulatery domain.

the 3rd AP which is connected with WLC can have 18 dBm but this all depends on your regulatery domain made APs.

Scott is right, if you need to have good signal the add more APs.


Regards

Dont forget to rate helpful posts

ducnm1234 Fri, 03/07/2014 - 06:09
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the 3rd AP which is connected with WLC can have 18 dBm

=> this is AP indoor 3602I-E-K9 in my network

With the same E Regulatory domain why the indoor ap 3602 has power than 1552sa outdoor.

it's not simple that can explaint to customer about this.

Scott Fella Fri, 03/07/2014 - 08:19
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It's regulations... indoor has its own regulations from outdoor depending on the country.  The antenna gain on the 3602i is also a lower gain antenna.


Thanks,

Scott

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Scott Fella Fri, 03/07/2014 - 08:35
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Here is an excel spreadsheet for the 3600's channel and max power:


http://tinyurl.com/kbfskeg


Thanks,

Scott

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Sandeep Choudhary Fri, 03/07/2014 - 08:39
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Hi Nguyen,


The maximum power setting will vary by channel and according to individual country regulations.


For this you cant do anything because cisco made this products and you can give the maual of these Access Point to your custmoer to make them understand.


http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1550-series/data_sheet_c78-711419.pdf


http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-3600-series/data_sheet_c78-686782.html



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