Cisco Catalyst 9120AX Series Access Points

1 About this Guide

This guide provides instructions on how to install your Cisco Catalyst 9120AX series access points and links to resources for configuring the access point. It includes mounting instructions and limited troubleshooting procedures. The 9120AX series access point is referred to as access point or AP in this document.

2 About the Access Point

The Cisco Catalyst 9120AX series wireless access point is a dual band, dual concurrent, enterprise 802.11ax (Wi-Fi 6) AP. This series has three models: one with integrated antennas and two with external antennas, designed for both 2.4 GHz and 5 GHz bands. It supports a greater overall High Density Experience (HDX) for predictable performance in advanced applications like 4K/8K video, high-density collaboration, all-wireless offices, and Internet-of-Things (IoT). The access point ensures full interoperability with leading 802.11ax and 802.11ac clients and supports mixed deployments with other access points and controllers, offering integrated security, resiliency, operational flexibility, and increased network intelligence.

A full listing of the access point's features and specifications is available in the Cisco Catalyst 9120AX Series Access Point Data Sheet at: https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9120ax-series-access-points/datasheet-c78-742115.html

Access Point Features

The 9120AX series access point is a wireless controller-based product and supports:

• Four dual-band integrated internal antennas, omni-directional in azimuth for both 2.4 GHz and 5 GHz on the 9120AXI access point models (C9120AXI-x and C9120AXI-EWC-x).
• External antennas on the 9120AXE and 9120AXP AP models (C9120AXE-x, C9120AXE-EWC-x, C9120AXP-x and C9120AXP-EWC-x).
• Four radios: a 4x4 XOR radio for 2.4 GHz or 5 GHz, a single band 4x4 radio for 5 GHz, a 2.4 GHz radio for BLE, Zigbee, Thread, and other 802.15.4 protocol devices, and an auxiliary radio for 2.4 GHz and 5 GHz.
• Simultaneous 4x4 MIMO with four spatial streams for both 2.4 GHz and 5 GHz bands.
• Multiuser Multiple-Input Multiple-Output (MU-MIMO) technology with 4 spatial streams for downlink.
• Orthogonal Frequency Division Multiple Access (OFDMA)-based scheduling for both downlink and uplink.

Hardware External Interfaces:

• 1x100/1000/2500 Multigigabit Ethernet (RJ-45)
• RS-232 Console Interface through RJ-45
• Recovery push button (enables partial or full system configuration recovery)
• USB 2.0 Port
• One multi-color LED Status indicator (refer to "Checking the Access Point LEDs" section for details).

Additional Features:

• Integrated Bluetooth Low Energy (BLE) radio for IoT use cases like location tracking and wayfinding.
• Cisco RF ASIC (Software Defined Radio) for advanced RF spectrum analysis, CleanAir, Wireless Intrusion Prevention System (WIPS), and DFS detection.
• Intelligent Capture for network probing and Cisco DNA Center analysis.
• Spatial Reuse (BSS coloring) for differentiating between BSSs and enabling more simultaneous transmissions.
• Target Wake Time (TWT) power saving mode for battery-operated devices.
• Cisco Digital Network Architecture (DNA) support for Cisco Connected Mobile Experiences, Apple FastLane, and Cisco Identity Services Engine.
• Optimized AP Roaming for client association with the best data rate.
• Cisco CleanAir technology with 160MHz channel support for proactive spectrum intelligence against wireless interference.

Operating Modes:

• Local: Default mode; the AP serves clients.
• FlexConnect: FlexConnect mode for the AP.
• Monitor: Monitor-only mode for the AP.
• Sniffer: Captures and forwards packets on a given channel to a remote machine for analysis (e.g., Airopeek, Wireshark).

Note: In sniffer mode, the server receiving data must be on the same VLAN as the wireless controller management VLAN.

AP Model Numbers and Regulatory Domains

The 'x' in model numbers represents the regulatory domain. For information on supported regulatory domains, see the "AP Model Numbers and Regulatory Domains" section.

Verify AP model approval for your country and identify the regulatory domain at www.cisco.com/go/aironet/compliance.

Antennas and Radios

The 9120AX series access point has dedicated 2.4 GHz and 5 GHz radios. Configurations include:

• C9120AXI-x
• C9120AXI-EWC-x
• C9120AXE-x
• C9120AXE-EWC-x
• C9120AXP-x
• C9120AXP-EWC-x

Internal Antennas

The 9120AXI models (C9120AXI-x and C9120AXI-EWC-x) feature four integrated, internal, dual-band antennas, plus four single-band 5 GHz antennas (for dual 5 GHz mode), one 2.4 GHz antenna for IoT, and one dual-band antenna for the auxiliary radio.

External Antennas

The 9120AXE (C9120AXE-x and C9120AXE-EWC-x) and 9120AXP models (C9120AXP-x and C9120AXP-EWC-x) support four external, dual-band RP-TNC connectors.

Note: Always connect external antennas to 9120AXE and 9120AXP models before powering up the AP. Enabling radios without antennas can damage the AP.

The 9120AXE and 9120AXP models include a 4-port Smart Antenna (DART) connector. External antennas, including Self Identifying Antennas (SIA), can connect via the 4-port DART cable connector (AIR-CAB002-DART-R=).

Table 1: List of External Antennas Supported on C9120AXE and C9120AXP

Cisco also provides the following external antenna accessories:

• 5 ft Low Loss RF cable with RP-TNC and N connectors (4 cables required) (AIR-CAB005LL-R-N/=)
• 2 ft Smart Antenna Connector to RP-TNC Connectors (AIR-CAB002-DART-R=)

3 Safety Instructions

Translated versions of the following safety warnings are provided in the translated safety warnings document that is shipped with your access point. The translated warnings are also in the Translated Safety Warnings for Cisco Catalyst Access Points, available on Cisco.com.

Warning: IMPORTANT SAFETY INSTRUCTIONS

This warning symbol ⚠️ means danger. You are in a situation that could cause bodily injury. Before working on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. Use the statement number provided at the end of each warning to locate its translation in the translated safety warnings that accompanied this device.

SAVE THESE INSTRUCTIONS Statement 1071

Warning: Read the installation instructions before using, installing, or connecting the system to the power source. Statement 1004

Warning: Installation of the equipment must comply with local and national electrical codes. Statement 1074

Warning: In order to comply with FCC radio frequency (RF) exposure limits, antennas should be located at a minimum of 12 inches (30 cm) or more from the body of all persons. Statement 332

Warning: Ultimate disposal of this product should be handled according to all national laws and regulations. Statement 1040

Warning: This equipment is suitable for use in environment air spaces (plenums) in accordance with Section 300.22 (C) of the National Electrical Code, and Sections 2-128, 12-010(3) and 12-100 of the Canadian Electrical Code, Part 1, CSA C22.2. External power supply, power adapter, and/or power injector, if provided, are not suitable for installation in air spaces. Statement 440

Warning: This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than: 20A. Statement 1005

Caution: The 9120AX AP series is intended for indoor operation. While using the C9120AXE or C9120AXP AP models, if the external antenna is placed outdoors, you must ground the AP. For more information, see "Grounding the Access Point" section.

4 Unpacking

To unpack the access point, follow these steps:

1. Unpack and remove the access point and the accessory kit from the shipping box.
2. Return any packing material to the shipping container and save it for future use.
3. Verify that you have received the items listed below. If any item is missing or damaged, contact your Cisco representative or reseller for instructions:
   • The access point
   • Mounting bracket (selected when you ordered the access point)
   • Adjustable ceiling-rail clip (selected when you ordered the access point)

5 AP Views, Ports, and Connectors

Figure 1: Face of the 9120AXI Model

A top-down view of the Cisco Catalyst 9120AXI access point. It shows the Cisco logo, status indicators, and labels for ports and connectors. Label 1 points to the location of ports and connectors on the head of the AP. Label 2 points to the USB 2.0 port. Label 3 points to the Status LED.

Figure 2: Ports and Connectors on the Head of the 9120AXI Model

A view of the underside of the Cisco Catalyst 9120AXI access point, revealing its ports and connectors. Label 1 indicates the 2.5GbE port. Label 2 indicates the RJ-45 console port. Label 3 indicates the USB 2.0 port, located under a mylar cover. Label 4 indicates the Mode button. Label 5 indicates the Security hasp for padlocking the AP to a mounting bracket.

Figure 3: Face of the 9120AXE and 9120AXP Models

A top-down view of the Cisco Catalyst 9120AXE and 9120AXP access points. It shows the Cisco logo and four external antenna connectors. Label 1 points to the location of the 4-port Smart Antenna (DART) connector, under a mylar cover. Label 2 points to the general location of ports and connectors on the head of the AP. Label 3 indicates RP-TNC antenna connector port (Dual-band A). Label 4 indicates RP-TNC antenna connector port (Dual-band B). Label 5 indicates the USB 2.0 port, under a mylar cover. Label 6 indicates the Status LED. Label 7 indicates RP-TNC antenna connector port (Dual-band C). Label 8 indicates RP-TNC antenna connector port (Dual-band D). A note indicates that Self Identifying Antenna compatible RP-TNC connector ports are marked with purple text.

Figure 4: Ports and Connections on the Head of the 9120AXE and 9120AXP Models

A view of the underside of the Cisco Catalyst 9120AXE and 9120AXP access points. Label 1 indicates the 4-port Smart Antenna (DART) connector port, under a mylar cover. Label 2 indicates the Security hasp for padlocking the AP to a mounting bracket. Label 3 indicates the 2.5 GbE port. Label 4 indicates the RJ-45 console port. Label 5 indicates the USB 2.0 port, under a mylar cover. Label 6 indicates the Mode button. A note specifies that only external antennas with the 4-port DART cable can be connected to this AP.

6 Preparing the AP for Installation

Before mounting and deploying your access point, perform a site survey (or use the site planning tool) to determine the best installation location. Ensure you have the following information available:

• Access point locations.
• Access point mounting options: below a suspended ceiling, on a flat horizontal surface, or on a desk top.

Note: Mounting above a suspended ceiling requires additional mounting hardware. Refer to the "Mounting the Access Point" section for details.

• Access point power options: 802.3at (PoE+) (Cisco Power Injector AIR-PWRINJ6=) or 802.3af (Cisco Power Injector AIR-PWRINJ5=).

Note: If 802.3af is used, the 2.4 GHz and 5 GHz radios will operate at 1x1, and Ethernet will be downgraded to 1 GbE. The USB port will also be off.

• Operating temperature:
  • For 9120AXI model: 32°–122°F (0°–50°C)

Note: When installing the 9120AXI model in ambient temperatures between 104°–122°F (>40°–50°C), the AP must be configured for 2x2 on both 2.4 GHz and 5 GHz radios, and 1GbE Ethernet. The USB port should not be loaded.

• For 9120AXE and 9120AXP models: -4°–122°F (-20°–50°C)

Cisco recommends creating a site map showing access point locations to record device MAC addresses and facilitate network management.

7 Installation Overview

Installing the access point involves the following operations:

1. Performing a Pre-Installation Configuration, page 13 (optional)
2. Mounting the Access Point, page 15
3. Grounding the Access Point, page 17
4. Preparing the AP for Installation, page 12

8 Performing a Pre-Installation Configuration

The following procedures ensure your access point installation and initial operation proceed as expected. This procedure is optional.

Note: Pre-installation configuration is optional. If your network controller is properly configured, you can install the access point in its final location and connect it to the network. See the "Deploying the Access Point on the Wireless Network" section on page 19 for details.

Figure 5: Pre-Installation Configuration Setup

A diagram illustrating the pre-installation configuration setup. It shows a network hierarchy with a "Controller" at the top, connected to "Layer 3 devices," which are then connected to "Cisco Aironet access points."

Steps for Pre-Installation Configuration:

1. Ensure the Cisco Wireless Controller DS port is connected to the network. Use the appropriate Cisco Wireless Controller guide for CLI or web-browser interface procedures.
   • Verify that access points have Layer 3 connectivity to the Cisco Wireless Controller Management and AP-Manager Interface.
   • Configure the switch to which your access point will attach. Refer to the Cisco Wireless Controller Configuration Guide for your release.
   • Set the Cisco Wireless Controller as the master so new access points join it by default.
   • Ensure DHCP is enabled on the network for the access point to receive its IP address.

Note: An 802.11ax Cisco AP receives an IP address from the DHCP server only if a default router (gateway) is configured on the DHCP server and the gateway ARP is resolved.

2. Ensure CAPWAP UDP ports are not blocked.
3. The access point must be able to find the controller's IP address via DHCP, DNS, or IP subnet broadcast. This guide describes the DHCP method. Refer to product documentation for other methods. See also "Configuring DHCP Option 43" on page 24.

Note: The access point requires a gigabit Ethernet (GbE) link to prevent the Ethernet port from becoming a bottleneck, as wireless traffic speeds exceed 10/100 Ethernet port speeds.

4. Apply power to the access point. See "Grounding the Access Point," page 17.
   • As the AP connects to the controller, LEDs cycle through green, red, and blue (up to 5 minutes).

Note: If the AP remains in this mode for over five minutes, it cannot find the Master Cisco Wireless Controller. Check the connection and ensure the AP and controller are on the same subnet.

5. If the AP shuts down, check the power source.
6. After finding the Cisco Wireless Controller, the AP attempts to download the new operating system code if the version differs. The Status LED blinks blue during this process.
7. If the OS download is successful, the AP reboots.
8. Configure the access point if required, using the controller CLI, GUI, or Cisco Prime Infrastructure to customize 802.11ac network settings.
9. If pre-installation configuration is successful, the Status LED turns green. Disconnect the AP and mount it at its intended deployment location.
10. If the AP does not indicate normal operation, power it off and repeat the pre-installation configuration.

Note: When installing a Layer 3 AP on a different subnet than the Cisco Wireless Controller, ensure a DHCP server is reachable from the AP's subnet, and that the subnet has a route back to the Cisco Wireless Controller. Ensure the route back to the controller has destination UDP ports 5246 and 5247 open for CAPWAP. Also, ensure routes allow IP packet fragments and that if address translation is used, the AP and controller have a static 1-to-1 NAT. Port Address Translation is not supported.

9 Mounting the Access Point

Cisco Catalyst 9120AX series access points can be mounted in several configurations: on a suspended ceiling, a hard ceiling or wall, an electrical or network box, or above a suspended ceiling.

For mounting instructions, visit: www.cisco.com/c/en/us/td/docs/wireless/access_point/mounting/guide/apmount.html

Table 2: Brackets and Clips for Mounting the AP

1. Mount the AP using no less than four screw holes on a bracket.
2. AIR-AP-BRACKET-3 is not compatible with Cisco Catalyst 9120AX series access points.
3. "In-tile" mounting options are available from third parties. Refer to the access point data sheet on Cisco.com for more information.

When mounting the AP in areas where it might be knocked off the bracket, use the lock hasp or a plastic tie on the back of the AP (see Figure 6) to secure it.

Figure 6: Locking the AP to the Bracket

A rear view of the access point showing the mounting bracket attachment points and the location of the hasps for securing the AP. Label 1 points to the position of the hasps for the locks on the back of the 9120AXI model.

10 Grounding the Access Point

Warning: Only trained and qualified personnel should install, replace, or service this equipment. Statement 1030

Grounding is not always required for indoor installations. However, for C9120AXE or C9120AXP AP models with outdoor external antennas, grounding the AP is mandatory before connecting power.

For supported external antennas, see "List of External Antennas Supported on C9120AXE and C9120AXP".

Required user-supplied tools and materials for grounding:

• Copper ground wire (minimum 18AWG)
• Grounding O-ring connector (M3 stud size)
• Crimping tool
• Wire stripping tool
• Phillips screwdriver (Number 2)

Warning: To reduce the risk of electric shock, the chassis of this equipment must be connected to permanent earth ground during normal use. Statement 445

If grounding is required for your C9120AXE or C9120AXP AP installation, follow these steps after mounting:

1. Find a suitable building grounding point near the AP.
2. Connect the ground wire to the building grounding point.
3. Route the other end of the ground wire to the AP.
4. Strip the ground wire to 0.22 inches (5.56mm) using the wire stripping tool.
5. Insert the ground wire into the open end of the connector.

Figure 7: Grounding O-ring connector

An image of a metal O-ring connector, typically used for grounding connections.

6. Crimp the connector's wire receptacle carefully around the wire for a proper mechanical connection.
7. Locate the chassis ground connector on the AP.

Figure 8: Grounding Label on the Head of the 9120AXE and 9120AXP Models

A view of the underside of the access point showing the location of the grounding label. Label 1 points to the grounding label.

8. Secure the connector to the AP using the connector's washer and screw. Tighten carefully with a screwdriver until the connector is held firmly to the chassis; do not over-tighten.

Caution: Connect the power cable to the AP only after the AP is grounded.

The outdoor antenna connection must be grounded per ANSI/NFPA 70 (NEC), Article 800, Grounding of Outer Conductive Shield of a Coaxial Cable.

Warning: To reduce the risk of electric shock, the shield of the coaxial cable must be connected to the building earth. Statement 1094

11 Powering the Access Point

For C9120AXE or C9120AXP AP models using external antennas, ensure antennas are connected before applying power.

The AP can be powered via Power-over-Ethernet (PoE) using:

• 802.3at (PoE+): Any 802.3at (30.0 W) compliant switch port or Cisco Power Injector AIR-PWRINJ6=.
• 802.3af: Any 802.3af (15.4 W) compliant switch port or Cisco Power Injector AIR-PWRINJ5=.

Note: If 802.3af is used, the 2.4 GHz and 5 GHz radios will operate at 1x1, and Ethernet will be downgraded to 1 GbE. The USB port will also be off.

12 Configuring and Deploying the Access Point

This section details connecting the access point to a controller. Configuration occurs on the controller; refer to the Cisco Wireless Controller Configuration Guide for details.

The Controller Discovery Process

Note: The controller must be running release 8.9.111.0 or later to support 9120AX series access points. Refer to the access point data sheet on Cisco.com for more information.

• Access point names with spaces cannot be edited or queried via controller CLI.
• Ensure the controller is set to the current time; an incorrect time may invalidate certificates and prevent AP joining.

Access points must be discovered by a controller before becoming active network components. Supported discovery processes include:

• Locally stored controller IP address discovery: If previously joined to a controller, the AP stores primary, secondary, and tertiary controller IP addresses in non-volatile memory. This process is called priming. See "Performing a Pre-Installation Configuration" on page 13.
• DHCP server discovery: Uses DHCP option 43 to provide controller IP addresses. Cisco switches often support this. See "Configuring DHCP Option 43" on page 24.
• DNS discovery: APs discover controllers via DNS. Configure DNS to return controller IP addresses for CISCO-CAPWAP-CONTROLLER.localdomain. This provides backwards compatibility. When an AP gets IP/DNS from DHCP, it contacts DNS to resolve the name, and then sends discovery requests to the listed controllers.

Deploying the Access Point on the Wireless Network

After mounting the access point, follow these steps:

1. Connect and power up the access point.
2. Observe the access point LED (see "Checking the Access Point LEDs" on page 22 for descriptions).
   • On power-up, the AP begins a sequence (green, red, off) for power-up, discovery, and join. A chirping green LED indicates no clients associated; solid green indicates one or more clients.
   • If the LED is off, the AP is likely not receiving power.
   • If the LED blinks sequentially for over 5 minutes, the AP cannot find its primary, secondary, or tertiary Cisco Wireless Controller. Check connections and ensure the AP and controller are on the same subnet or have a route back. If not on the same subnet, ensure a properly configured DHCP server is present. See "Configuring DHCP Option 43" on page 24.
3. Reconfigure the Cisco Wireless Controller so it is not the master.

Note: A master Cisco Wireless Controller should only be used for configuring access points, not in a live network.

13 Self-Identifying Antennas

The 9120AXE and 9120AXP APs support Self-Identifying Antennas. These antennas have a purple band or label on RP-TNC connectors, indicating they should connect to dual-band port A on the AP, which is also marked with purple text.

Figure 9: Dual-band port A on C9120AXE and C9120AXP Models for Self-Identifying Antennas

A close-up image of an RP-TNC connector port on the access point, marked with purple text and a purple band, indicating it is Dual-band port A, compatible with Self-Identifying Antennas.

Other dual-band RP-TNC ports, not supporting Self-Identifying Antennas, are marked with standard orange text. While Self-Identifying Antennas can connect to any RP-TNC port, only port A correctly identifies them.

Figure 10: Dual-band port on C9120AXE and C9120AXP Models for non-Self-Identifying Antennas

A close-up image of an RP-TNC connector port on the access point, marked with orange text, indicating it is a standard dual-band port not specifically for Self-Identifying Antennas.

When a 9120AXE or 9120AXP AP powers up with a Self-Identifying Antenna connected, its circuitry reads the antenna's EEPROM, automatically configuring gain and beam-width. Legacy antennas require manual configuration in the wireless controller.

Note: Always connect external antennas to 9120AXE and 9120AXP models before powering up the AP. Enabling radios without antennas can damage the AP.

14 Checking the Access Point LEDs

The location of the access point status LED is shown in Figure 2.

Note: Minor variations in LED color intensity and hue are normal and within manufacturer specifications. LED intensity can be adjusted via the controller.

Table 3: LED Status Indications

15 Miscellaneous Usage and Configuration Guidelines

Using the Mode Button

Using the Mode button (see Figure 2) allows you to:

• Reset the AP to the default factory-shipped configuration.
• Clear the AP internal storage, including all configuration files.

To use the mode button, press and hold it during the AP boot cycle until the AP status LED changes to Blue. A seconds counter will appear on the AP console.

• Factory Reset: Keep the mode button pressed for less than 20 seconds. This clears AP configuration files, resetting all settings to factory defaults (passwords, WEP keys, IP address, SSID).
• Clear Internal Storage: Keep the mode button pressed for more than 20 seconds but less than 60 seconds. The AP status LED changes from Blue to Red, and all files in the AP storage directory are cleared.

If the mode button is pressed for more than 60 seconds, it is assumed faulty, and no changes are made.

Troubleshooting the Access Point to Cisco Controller Join Process

Note: Ensure your controller is running software Release 8.9.111.0 or later, as specified in the Cisco Wireless Solutions Software Compatibility Matrix.

Access points may fail to join a controller for various reasons, including pending RADIUS authorization, disabled self-signed certificates, or mismatched regulatory domains. Controller software can send CAPWAP-related errors to a syslog server for analysis.

The controller tracks join information for access points that send discovery messages. This collection starts with the first discovery message and ends with the last configuration payload. If the controller reaches its maximum capacity for join information, it stops collecting data for new access points.

By default, an access point sends all syslog messages to IP address 255.255.255.255 when:

• A newly deployed AP runs software release 8.2.110.0 or later.
• An existing AP running software release 8.2.110.0 or later is reset after clearing its configuration.

If these conditions are met and the AP has not joined a controller, a DHCP server can be configured (using option 7) to return a syslog server IP address. The AP will then send syslog messages to this address.

Upon first joining a controller, the controller sends the global syslog server IP address (default 255.255.255.255) to the AP. This address is used until overridden by:

• A change in the controller's global syslog server IP address configuration (using `config ap syslog host global syslog_server_IP_address`).
• Configuration of a specific syslog server IP address for the AP on the controller (using `config ap syslog host specific Cisco_AP syslog_server_IP_address`).
• The AP disconnecting from its controller and joining a new one, which then sends its global syslog server IP address.

When a new syslog server IP address overrides an old one, the old address is erased from persistent storage. The AP then sends all syslog messages to the new IP address, provided it is reachable.

Syslog server configuration and AP join information can be viewed from the controller CLI only.

Important Information for Controller-based Deployments

Keep these guidelines in mind for 9120AX series access points:

• APs communicate only with Cisco wireless controllers.
• APs do not support Wireless Domain Services (WDS), but controllers provide equivalent functionality.
• CAPWAP does not support Layer 2. APs must discover controllers via Layer 3, DHCP, DNS, or IP subnet broadcast.
• The AP console port is enabled for monitoring and debug; configuration commands are disabled when connected to a controller.

Configuring DHCP Option 43

DHCP Option 43 provides controller IP addresses to APs, enabling them to find and join a controller. The following is a DHCP Option 43 configuration example for a Windows 2003 Enterprise DHCP server used with Cisco Catalyst lightweight access points. Consult product documentation for other DHCP server implementations. Use the controller management interface IP address for Option 43.

Note: DHCP Option 43 is limited to one access point type per DHCP pool. Configure a separate pool for each type.

The 9120AX series AP uses the type-length-value (TLV) format for DHCP Option 43. DHCP servers must return the option based on the AP's DHCP Vendor Class Identifier (VCI) string: Cisco AP C9120AX.

The TLV block format is:

• Type: 0xf1 (decimal 241)
• Length: Number of controller IP addresses * 4
• Value: IP addresses of WLC management interfaces, sequentially in hex.

To configure DHCP Option 43 in the embedded Cisco IOS DHCP server:

1. Enter configuration mode at the Cisco IOS CLI.
2. Create the DHCP pool with necessary parameters (default router, name server). Example scope:ip dhcp pool <pool name>
network <IP Network> <Netmask>
default-router <Default router>
dns-server <DNS Server>
3. Add the option 43 line: option 43 hex <hex string>

The hex string concatenates TLV values. Example: For two controllers with IPs 10.126.126.2 and 10.127.127.2, the hex string is f1080a7e7e020a7f7f02.

16 FAQs

What is 802.11ax?

IEEE 802.11ax, also known as High-Efficiency Wireless (HEW) or Wi-Fi 6, builds upon 802.11ac. It offers improved performance in typical environments and more predictable performance for advanced applications like 4K/8K video, high-density collaboration, all-wireless offices, and IoT. It operates on both 2.4 GHz and 5 GHz bands.

What are Self Identifying Antennas?

Self Identifying Antennas are external, dual-band antennas for 802.11ax APs (like 9120AXE and 9120AXP models) that automatically detect and identify antenna gain and beam-width values, eliminating manual provisioning by the wireless controller or network management system.

What is Flexible Radio Assignment?

Flexible Radio Assignment (FRA) automatically adjusts dual radios (e.g., from 2.4 GHz/5 GHz to 5 GHz/5 GHz) to serve more clients when device density is high. It also monitors for security threats and RF interference. FRA improves mobile user experience in high-density networks and has modes including Default (2.4/5 GHz clients), Dual 5 GHz Mode, and Wireless Security Monitoring.

What is a Smart Antenna connector?

The 9120AXE and 9120AXP models feature a Smart Antenna connector directly linked to the flexible radio. Without an external antenna, the flexible radio defaults to 2.4 GHz mode. With an external antenna connected, it supports full Flexible Radio Assignment, including dual 5 GHz and Wireless Security Monitoring modes. The DART cable connector (AIR-CAB002-DART-R=) is used to connect RP-TNC external antennas to this connector.

Figure 11: Smart Antenna Connector C9120AXE and C9120AXP Models

An image showing the 12-pin Smart Antenna connector on the access point.

Figure 12: AIR-CAB002-DART-R= DART Connector

An image of the DART cable connector, which has multiple RP-TNC connectors on one end and a single multi-pin connector on the other, used to connect external antennas to the Smart Antenna connector.

What is Cisco Multigigabit Ethernet?

Cisco Multigigabit Ethernet (mGig) is a Cisco innovation supporting speeds from 1 to 10 Gbps over traditional Cat 5e cabling or newer. The 9120AX AP supports up to 2.5 Gbps using mGig, addressing the increased bandwidth needs of 802.11ax and modern wireless applications. For more information, see the Cisco Multigigabit FAQ document: http://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise-networks/catalyst-multigigabit-switching/multigigabit-ethernet-technology.pdf

17 Related Documentation

All user documentation for the Cisco Catalyst 9120AX series access point is available at: www.cisco.com/c/en/us/support/wireless/aironet-9120AX-series-access-points/tsd-products-support-series-home.html

For detailed configuration and deployment guidelines, see:

• Cisco Wireless Controller Configuration Guide, Release 8.9: www.cisco.com/c/en/us/td/docs/wireless/controller/8-9/config-guide/b_cg89.html
• Cisco Catalyst 9120AX Series Access Point Deployment Guide: https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9100ax-access-points/guide-c07-742311.html

18 Declarations of Conformity and Regulatory Information

This section provides declarations of conformity and regulatory information for the Cisco Catalyst 9120AX Series Access Points. Additional information is available at: www.cisco.com/go/aironet/compliance

Manufacturers Federal Communication Commission Declaration of Conformity Statement

Access Point Models:
C9120AXI-B
C9120AXE-B
C9120AXP-B

Certification Number:
LDKVCVER1937
LDKEDAC92157
LDKROFSN2177

Manufacturer:
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA

This device complies with Part 15 rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential environment. The equipment generates, uses, and radiates radio frequency energy; improper installation or use may cause harmful interference. No guarantee of no interference is provided. If interference occurs, users are encouraged to correct it by:

• Reorienting or relocating the receiving antenna.
• Increasing separation between the equipment and receiver.
• Connecting the equipment to a circuit different from the receiver's.
• Consulting a dealer or an experienced radio/TV technician.

Caution: The Part 15 radio device operates on a non-interference basis with integrated antennas. Modifications not expressly approved by Cisco may void the user's authority to operate this device.

VCCI Statement for Japan

Warning: This is a Class B product based on the Voluntary Control Council for Interference from Information Technology Equipment (VCCI) standard. Use near radio or television receivers in domestic environments may cause interference. Install and use according to the instruction manual.

Guidelines for Operating Cisco Catalyst Access Points in Japan

This section provides guidelines for avoiding interference when operating Cisco Catalyst access points in Japan, in both Japanese and English.

Japanese Translation:

この機器の使用周波数帯では、電子レンジ等の産業・科学・医療用機器のほか工場の製造ライン等で使用されている移動体識別用の構内無線局(免許を要する無線局)及び特定小電力無線局(免許を要しない無線局)が運用されています。1. この機器を使用する前に、近くで移動体識別用の構内無線局及び特定小電力無線局が運用されていないことを確認して下さい。2. 万一、この機器から移動体識別用の構内無線局に対して電波干渉の事例が発生した場合には、速やかに使用周波数を変更するか又は電波の発射を停止した上、下記連絡先にご連絡頂き、混信回避のための処置等(例えば、パーティションの設置など)についてご相談して下さい。3. その他、この機器から移動体識別用の特定小電力無線局に対して電波干渉の事例が発生した場合など何かお困りのことが起きたときは、次の連絡先へお問い合わせ下さい。連絡先:03-6434-6500

English Translation:

This equipment operates in the same frequency bandwidth as industrial, scientific, and medical devices such as microwave ovens and mobile object identification (RF-ID) systems (licensed premises radio stations and unlicensed specified low-power radio stations) used in factory production lines.

1. Before using this equipment, make sure that no premises radio stations or specified low-power radio stations of RF-ID are used in the vicinity.
2. If this equipment causes RF interference to a premises radio station of RF-ID, promptly change the frequency or stop using the device; contact the number below and ask for recommendations on avoiding radio interference, such as setting partitions.
3. If this equipment causes RF interference to a specified low-power radio station of RF-ID, contact the number below.

Contact Number: 03-6434-6500

Statement 371—Power Cable and AC Adapter

Japanese: 接続ケーブル、電源コード、ACアダプタ、バッテリーなどの部品は、必ず添付品または指定品をご使用ください。添付品・指定品以外の部品をご使用になると故障や動作不良、火災の原因となります。また、電気用品安全法により、当該法の認定(PSEとコードに表記)でなくUL認定(ULまたはCSAマークがコードに表記)の電源ケーブルは弊社が指定する製品以外の電気機器には使用できないためご注意ください。

English Translation: When installing the product, please use the provided or designated connection cables/power cables/AC adaptors. Using any other cables/adaptors could cause a malfunction or a fire. Electrical Appliance and Material Safety Law prohibits the use of UL-certified cables (that have the "UL” shown on the code) for any other electrical devices than products designated by CISCO. The use of cables that are certified by Electrical Appliance and Material Safety Law (that have "PSE” shown on the code) is not limited to CISCO-designated products.

Industry Canada

Access Point Models:
C9120AXI-A
C9120AXE-A
C9120AXP-A

Certification Number:
2461N-VCVER1937
2461N-EDAC92157
2461N-ROFSN2177

Canadian Compliance Statement

This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.

This radio transmitter has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés ci-dessous et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.

Table 4: List of Internal Antennas Supported on C9120AXI

Table 5: List of External Antennas Supported on C9120AXE and C9120AXP

RF Exposure Information

This section contains information on compliance with guidelines related to RF exposure.

Generic Discussion on RF Exposure

Cisco products are designed to comply with national and international standards on Human Exposure to Radio Frequencies, including:

• US 47 Code of Federal Regulations Part 2 Subpart J
• American National Standards Institute (ANSI) / Institute of Electrical and Electronic Engineers / IEEE C 95.1 (99)
• International Commission on Non Ionizing Radiation Protection (ICNIRP) 98
• Ministry of Health (Canada) Safety Code 6. Limits on Human Exposure to Radio Frequency Fields in the range from 3kHz to 300 GHz
• Australia Radiation Protection Standard

To ensure compliance with Electromagnetic Field (EMF) standards, the system should only be operated with Cisco approved antennas and accessories.

This Device Meets International Guidelines for Exposure to Radio Waves

The 9120AX series device includes a radio transmitter and receiver designed not to exceed international exposure limits for radio waves (radio frequency electromagnetic fields). These guidelines include a substantial safety margin for the safety of all persons.

Systems are designed to avoid antenna contact by the end user. It is recommended to place the system where antennas maintain a minimum specified distance from the user to reduce overall exposure.

The World Health Organization states that current scientific information does not indicate the need for special precautions for wireless devices. For further exposure reduction, reorient antennas away from the user, increase separation distance, or lower transmitter power.

This Device Meets FCC Guidelines for Exposure to Radio Waves

The 9120AX series device is designed not to exceed FCC Part 1.1310 limits for radio wave exposure. Guidelines are based on IEEE ANSI C 95.1 (92) and include a safety margin for all persons.

Systems are designed to avoid antenna contact by the end user. It is recommended to place the system where antennas maintain a minimum specified distance from the user to reduce overall exposure.

The device has been tested and found compliant with applicable regulations.

The US Food and Drug Administration states no special precautions are needed. The FCC recommends reorienting antennas, increasing separation distance, or lowering transmitter power for further exposure reduction.

This Device Meets the Industry Canada Guidelines for Exposure to Radio Waves

The 9120AX series device is designed not to exceed Health Canada Safety Code 6 limits for radio wave exposure. Guidelines include a safety margin for all persons.

Systems are designed to avoid antenna contact by the end user. It is recommended to place the system where antennas maintain a minimum specified distance from the user to reduce overall exposure.

Health Canada states current scientific information does not indicate the need for special precautions. For further exposure reduction, reorient antennas away from the user, increase separation distance, or lower transmitter power.

European Community, Switzerland, Norway, Iceland, and Liechtenstein

Access Point Models:
C9120AXI-E
C9120AXE-E
C9120AXP-E

Note: This equipment is intended for use in all EU and EFTA countries. Outdoor use may be restricted to certain frequencies and/or may require a license. Contact Cisco Corporate Compliance for details.

The product carries the CE Mark: CE

Declaration of Conformity for RF Exposure

This section contains information on compliance with guidelines related to RF exposure.

Generic Discussion on RF Exposure

Cisco products are designed to comply with the following national and international standards on Human Exposure to Radio Frequencies:

• US 47 Code of Federal Regulations Part 2 Subpart J
• American National Standards Institute (ANSI) / Institute of Electrical and Electronic Engineers / IEEE C 95.1 (99)
• International Commission on Non Ionizing Radiation Protection (ICNIRP) 98
• Ministry of Health (Canada) Safety Code 6. Limits on Human Exposure to Radio Frequency Fields in the range from 3kHz to 300 GHz
• Australia Radiation Protection Standard

To ensure compliance with Electromagnetic Field (EMF) standards, the system should only be operated with Cisco approved antennas and accessories.

Operation of Cisco Catalyst Access Points in Brazil

This section contains special information for operation of Cisco Catalyst access points in Brazil.

Access Point Models:
C9120AXI-Z
C9120AXE-Z
C9120AXP-Z

Portuguese Translation: Este equipamento não tem direito à proteção contra interferência prejudicial e não pode causar interferência em sistemas devidamente autorizados.

English Translation: This equipment is not entitled to the protection from harmful interference and may not cause interference with duly authorized systems.

Figure 13: Brazil Regulatory Information

An image displaying the ANATEL logo and a barcode, representing Brazilian regulatory information.

Declaration of Conformity Statements

All Declaration of Conformity statements related to this product can be found at: http://www.ciscofax.com

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