Radio interface need to be disabled when antenna is not present?

I have been informed within a training class that the radio interface of an access point should be disabled when an antenna is not present. The reason given was that it would protect the radio from being adversely affected (potetnial for irreparable conditions). Question: 1) Is this true? 2) If so, where can I find supporting documentation on CCO? (I have not been able to find corroboratory information.)

Hi Vincent,
Here is a doc that speaks to this issue ( I don't see this causing irreparable damage but, better safe than sorry :)
Q. If you operate the radio but do not attach the antenna, can you damage the radio?
A. Some radio equipment manufacturers specifically warn against the operation of radios without the attachment of the antenna. Operation without the antenna can damage the transmitter. Most pieces of amateur or commercial radio equipment carry this warning because the equipment operates at a much higher transmitter power. A failure to use a proper antenna or load causes a reflected wave standing wave ratio (SWR) that can damage the final amplifier stage. This final amplifier stage is the power amplifier (PA).
For Cisco Aironet equipment, the transmitter power output is 100 milliwatts (mW) for the 350 Series and 30 mW for the 340 Series. Damage is unlikely, but possible. If you need to run the devices without antennae, turn the transmitter power down to 1.5 mW. Also, you can use a 50/52 ohm dummy load (attenuator) to be safe.
From this good Q & A doc;
http://www.cisco.com/en/US/products/hw/wireless/ps441/products_qanda_item09186a0080094d01.shtml#aps
Hope this helps!
Rob

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capaho wrote:
That's like saying a boat is an airplane because it's not a car.
SMH
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Message was edited by:
srpunreddy

Need to admin disable 802.11a radio from a few light weight access points

Hi team,
I need help to admin disable the 802.11a radio interface from a few lightweight APs. The operational status of these radio interfaces is down, so I am getting the following error when I try to disable them from the wireless LAN controller.
(Cisco Controller) config>802.11a disable wds2.hyd.shaw.net
This slot is not operational because Regulatory Domain Check has failed! Unable to disable the Cisco AP.
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The two previous posts are correct: the regulatory domain is probably not allowing radio a to be enabled.
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Do you have controller ?? if yes then posts out put of sh sysinfo commad.
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Radio interface Problem in Air-lap1131-a-k9

I have one Air-lap1131-a-k9 and i convert in autonomus system , but when the AP reload the message " the interface radio is not present " apper
so when i type sh run the interfaces radio dont apper...
Please help me

Cisco IOS Software, C1130 Software (C1130-K9W7-M), Version 12.4(21a)JY, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 28-Apr-10 10:40 by prod_rel_team
Proceeding with system init
Proceeding to unmask interrupts
Initializing flashfs...
flashfs[1]: 150 files, 8 directories
flashfs[1]: 0 orphaned files, 0 orphaned directories
flashfs[1]: Total bytes: 15998976
flashfs[1]: Bytes used: 10304512
flashfs[1]: Bytes available: 5694464
flashfs[1]: flashfs fsck took 5 seconds.
flashfs[1]: Initialization complete....done Initializing flashfs.
Radio0 not present 0 0 0 0 0 3
Radio1 not present 0 0 0 0 0 2
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html you require further assistance please contact us by sending email to
[email protected]. AIR-LAP1131AG-A-K9   (PowerPCElvis) processor (revision A0) with 24566K/8192K bytes of memory.
Processor board ID FTX1253N1KJ
PowerPCElvis CPU at 262Mhz, revision number 0x0950
Last reset from power-on
1 FastEthernet interface
If
cisco
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:23:04:B7:BA:8C
Part Number                          : 73-8962-14
PCA Assembly Number                  : 800-24818-13
PCA Revision Number                  : A0
PCB Serial Number                    : FOC125002LQ
Top Assembly Part Number             : 800-29144-03
Top Assembly Serial Number           : FTX1253N1KJ
Top Revision Number                  : A0
Product/Model Number                 : AIR-LAP1131AG-A-K9
Press RETURN to get started!
*Mar 1 00:00:06.194: %SOAP_FIPS-2-SELF_TEST_IOS_SUCCESS: IOS SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 28-Apr-10 10:40 by prod_rel_team
*Mar 1 00:00:54.649: %SNMP-5-COLDSTART: SNMP agent on host ap is undergoing a cold start
*Mar 1 00:00:55.601: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to up
ap>
ap>
ap>en
Password:
*Mar 1 00:01:06.553: %LINK-3-UPDOWN: Interface BVI1, changed state to down
*Mar 1 00:01:07.553: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to down
Password:
ap#sh run
Building configuration...
Current configuration : 731 bytes
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
hostname ap
enable secret 5 $1$yzUD$BN8tHBfXumwWzTMN9YDj20
no aaa new-model
dot11 syslog
username Cisco password 7 1531021F0725
bridge irb
--More--                           !
interface FastEthernet0
no ip address
no ip route-cache
duplex auto
speed auto
bridge-group 1
no bridge-group 1 source-learning
bridge-group 1 spanning-disabled
interface BVI1
ip address dhcp client-id FastEthernet0
no ip route-cache
ip http server
no ip http secure-server
ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag
bridge 1 route ip
line con 0
--More--                           line vty 0 4
login local
end
ap#
ap#sh      hardware
Cisco IOS Software, C1130 Software (C1130-K9W7-M), Version 12.4(21a)JY, RELEASE
SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 28-Apr-10 10:40 by prod_rel_team
ROM: Bootstrap program is C1130 boot loader
BOOTLDR: C1130 Boot Loader (C1130-BOOT-M) Version 12.3(8)JEA, RELEASE SOFTWARE (
fc2)
ap uptime is 3 minutes
System returned to ROM by power-on
System image file is "flash:/c1130-k9w7-mx.124-21a.JY/c1130-k9w7-mx.124-21a.JY"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html you require further assistance please contact us by sending email to
[email protected]. AIR-LAP1131AG-A-K9   (PowerPCElvis) processor (revision A0) with 24566K/81
92K bytes of memory.
Processor board ID FTX1253N1KJ
PowerPCElvis CPU at 262Mhz, revision number 0x0950
Last reset from power-on
1 FastEthernet interface
If
cisco
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:23:04:B7:BA:8C
Part Number                          : 73-8962-14
PCA Assembly Number                  : 800-24818-13
PCA Revision Number                  : A0
PCB Serial Number                    : FOC125002LQ
Top Assembly Part Number             : 800-29144-03
Top Assembly Serial Number           : FTX1253N1KJ
Top Revision Number                  : A0
Product/Model Number                 : AIR-LAP1131AG-A-K9
Configuration register is 0xF
ap#         sh un
ap#         sh inv
ap#         sh inventory
NAME: "AP1130", DESCR: "Cisco Aironet 1130 Series (IEEE 802.11a/g) Access Point"
PID: AIR-LAP1131AG-A-K9, VID: V05, SN: FTX1253N1KJ

Radio interface need to be disabled when antenna is not present?

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