topic Re: Cisco Aironet 1552 SA - EIRP in Wireless

Cisco Aironet 1552 SA - EIRP

ducnm1234 — Mon, 05 Jul 2021 07:21:56 GMT

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

Re: Cisco Aironet 1552 SA - EIRP

Scott Fella — Fri, 07 Mar 2014 04:52:00 GMT

TX power depends in the country regulations. From the CLI, issue the following to determine the max TX power:

show advanced 802.11b txpower

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Cisco Aironet 1552 SA - EIRP

ducnm1234 — Fri, 07 Mar 2014 05:40:10 GMT

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

Re: Cisco Aironet 1552 SA - EIRP

Sandeep Choudhary — Fri, 07 Mar 2014 07:16:01 GMT

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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Cisco Aironet 1552 SA - EIRP

ducnm1234 — Fri, 07 Mar 2014 08:29:51 GMT

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

Re: Cisco Aironet 1552 SA - EIRP

Sandeep Choudhary — Fri, 07 Mar 2014 09:54:27 GMT

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

Cisco Aironet 1552 SA - EIRP

ducnm1234 — Fri, 07 Mar 2014 11:33:51 GMT

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

Re: Cisco Aironet 1552 SA - EIRP

Scott Fella — Fri, 07 Mar 2014 11:38:28 GMT

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.

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Re: Cisco Aironet 1552 SA - EIRP

Sandeep Choudhary — Fri, 07 Mar 2014 13:28:04 GMT

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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Cisco Aironet 1552 SA - EIRP

ducnm1234 — Fri, 07 Mar 2014 14:09:35 GMT

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.

Cisco Aironet 1552 SA - EIRP

Scott Fella — Fri, 07 Mar 2014 16:19:09 GMT

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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Cisco Aironet 1552 SA - EIRP

Scott Fella — Fri, 07 Mar 2014 16:35:49 GMT

Here is an excel spreadsheet for the 3600's channel and max power:

http://tinyurl.com/kbfskeg

Thanks,

Scott

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Cisco Aironet 1552 SA - EIRP

Sandeep Choudhary — Fri, 07 Mar 2014 16:39:08 GMT

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

Regrads

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