Cisco Catalyst IW9165D Heavy Duty Access Point Configuration Guide, Release 26.1.x

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Cisco Catalyst IW9165D Heavy Duty Access Point Configuration Guide, Release 26.1.x

Antenna disconnection detection

Updated: April 10, 2026

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Learn how the Antenna Disconnection Detection feature monitors antenna integrity on access points to ensure optimal performance and reliability by identifying impaired or disconnected antennas.

Antenna Disconnection Detection is a feature that monitors the signal strength delta across antennas on an access point to identify impaired or disconnected antennas.

  • Improves performance and reliability by using multiple antennas for better signal reception.

  • Detects antenna issues based on signal strength differences exceeding a defined threshold for a specific duration.

  • Notifies the system through IAPP messages and controller logs when an antenna issue is detected.

How Antenna Disconnection Detection Works

Multiple antennas on the transmitter and receiver of an access point (AP) enhance performance and reliability by selecting or combining the strongest signals. Detecting an impaired or physically broken antenna is critical to AP reliability.

The Antenna Disconnection Detection feature operates by monitoring the signal strength delta across the antennas on the receiver. If the delta exceeds a defined limit for a specific duration, the antenna is flagged as having issues.

  • Improved reception through antenna diversity.

  • Critical detection of antenna impairment or breakage.

  • Automated notification via IAPP messages and controller logs.

For more information about configuring Antenna Disconnection Detection on the Wireless Controller, see Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide .

Verify Antenna Disconnection Detection on an AP or AP Profile

This procedure describes how to ensure that APs are operating with properly connected antennas. Verifying this configuration can help diagnose connectivity or coverage issues.

Procedure

1.

Use the show ap nameap-name config general command to verify the configuration on an AP.

Example:

Conroller# show ap name AP4C42.1E51.A144 config general

Cisco AP Name   : AP4C42.1E51.A144
=================================================
Cisco AP Identifier                             : 8c84.4292.f840
Country Code                                    : Multiple Countries : US,CN,GB,HK,DE,IN,CZ,NZ
Regulatory Domain Allowed by Country            : 802.11bg:-ACE^   802.11a:-ABCDEHNSZ^   802.11 6GHz:-BEZ^
Radio Authority IDs                             : None
AP Country Code                                 : CZ  - Czech Republic
AP Regulatory Domain
802.11bg                                      : -E
802.11a                                       : -E
MAC Address                                     : 8c84.4292.f840
IP Address Configuration                        : DHCP
IP Address                                      : 9.9.33.3
IP Netmask                                      : 255.255.255.0
Gateway IP Address                              : 9.9.33.1
Fallback IP Address Being Used                  : 
Domain                                          : 
Name Server                                     : 
CAPWAP Path MTU                                 : 1485
Capwap Active Window Size                       : 1
2.

Use the show ap profile nameap-profile detailed command to verify th detailed configuration parameters of a specific access point profile on the controller.

Example:

Controller# show ap profile name ap-profile detailed

AP Profile Name: ap-profile
.
.
.
AP broken antenna detection:
Status                                                 : ENABLED
RSSI threshold                                         : 40
Weak RSSI                                              : -80
Detection Time                                         : 120