Cisco Aironet Dual-Band MIMO Wall-Mounted Omnidirectional Antenna (AIR-ANT2544V4M-R and AIR-ANT2544V4M-RS)

Cisco Aironet Dual-Band MIMO Wall-Mounted Omnidirectional Antenna (AIR-ANT2544V4M-R and AIR-ANT2544V4M-RS)

---

Last Updated: February 06, 2020

This document outlines the specifications for the Cisco Aironet 2.4-GHz/5-GHz Dual-Band MIMO Wall-Mounted Omnidirectional Antennas (AIR-ANT2544V4M-R and AIR-ANT2544V4M-RS) and provides instructions for mounting them. Both antennas operate in the 2.4 GHz and 5 GHz frequency ranges and are designed for indoor or outdoor use. The AIR-ANT2544V4M-RS antenna includes self-identifying circuitry.

The following information is provided in this document.

• Technical Specifications
• System Requirements
• Safety Precautions
• Installation Notes
• Installing the Antenna
• Connecting the Antenna to the Access Point

Technical Specifications

Table 1 AIR-ANT2544V4M-Rx Dual-Band MIMO Wall-Mounted Omnidirectional Antenna Specifications

Antenna type	4-element MIMO omnidirectional
Operating frequency range	2400–2484 MHz
	5150–5850 MHz
Nominal input impedance	50 Ohms
VSWR	2:1 or less
Peak gain	2.4-GHz band: 4 dBi
	5-GHz band: 4 dBi
Polarization	Linear, vertical
Azimuth plane (3 dB beamwidth)	Ominidirectional
Elevation plane (3 dB beamwidth	2.4-GHz band: 60°
	5-GHz band: 33°
Length	8.6 in (21.8 cm)
Diameter	6.3 in (16 cm)
Weight	Antenna: 1.48 lb. (671.5 g);
Cable	3-ft. (91.4 cm) plenum
Connector	RP-TNC
Environment	Indoor/outdoor
Temperature range	-22° F to 158° F (-30° C to 70° C)

The figures below show the azimuth plane patterns (indicated by red lines) and elevation plane patterns (indicated by blue lines) for each element in the antenna.

2.4-GHz Antenna 1 Azimuth and Elevation Plane Patterns	5-GHz Antenna 1 Azimuth and Elevation Plane Patterns
2.4-GHz Antenna 2 Azimuth and Elevation Plane Patterns	5-GHz Antenna 2 Azimuth and Elevation Plane Patterns
2.4-GHz Antenna 3 Azimuth and Elevation Plane Patterns	5-GHz Antenna 3 Azimuth and Elevation Plane Patterns
2.4-GHz Antenna 4 Azimuth and Elevation Plane Patterns	5-GHz Antenna 4 Azimuth and Elevation Plane Patterns

System Requirements

This antenna is designed for indoor and outdoor use with any Cisco Aironet radio device with dual-band (2.4- and 5-GHz) RP-TNC connectors.

The Self Identifying Antenna model AIR-ANT2544V4M-RS= is supported only on Cisco Catalyst 9800 Series Wireless Controllers running an IOS-XE 17.4.1 release or a later release. This antenna model is not supported on Cisco AireOS Wireless Controllers.

Safety Precautions

Warning Do not locate the antenna near overhead power lines or other electric light or power circuits, or where it can come into contact with such circuits. When installing the antenna, take extreme care not to come into contact with such circuits, as they may cause serious injury or death. For proper installation and grounding of the antenna, please refer to national and local codes (e.g. U.S.: NFPA 70, National Electrical Code, Article 810, Canada: Canadian Electrical Code, Section 54). Statement 280

For your safety, read and follow these safety precautions.

1. Before you install an antenna, contact your Cisco account representative to explain which mounting method to use for the size and type of antenna that you are about to install.

2. Find someone to help you—installing an antenna is often a two-person job.

3. Select your installation site with safety, as well as performance, in mind. Remember that electric power lines and phone lines look alike. For your safety, assume that any overhead line can kill you.

4. Contact your electric power company. Tell them your plans and ask them to come look at your proposed installation.

5. Plan your installation carefully and completely before you begin. Each person involved in an installation should be assigned to a specific task, and should know what to do and when to do it. One person should be in charge of the operation to issue instructions and watch for signs of trouble.

6. When installing your antenna, follow these guidelines:

a. Do not use a metal ladder.

b. Do not work on a wet or windy day.

c. Do dress properly—wear shoes with rubber soles and heels, rubber gloves, and a long-sleeved shirt or jacket.

7. If the assembly starts to drop, move away from it and let it fall. Because the antenna, mast, cable, and metal guy wires are all excellent conductors of electrical current, even the slightest touch of any of these parts to a power line completes an electrical path through the antenna and the installer.

8. If any part of the antenna system should come in contact with a power line, do not touch it or try to remove it yourself. Call your local power company to have it removed safely.

9. If an accident should occur with the power lines, call for qualified emergency help immediately.

Installation Notes

Antennas transmit and receive radio signals which are susceptible to RF obstructions and common sources of interference that can reduce throughput and range of the device to which they are connected. Follow these guidelines to ensure the best possible performance:

• Install the antenna vertically and mount it with the cables pointing towards the ground.
• Keep the antenna away from metal obstructions such as heating and air-conditioning ducts, large ceiling trusses, building superstructures, and major power cabling runs. If necessary, use a rigid conduit to lower the antenna away from these obstructions.
• The density of the materials used in a building’s construction determines the number of walls the signal can pass through and still maintain adequate signal strength. Consider the following before choosing the location for your antenna:

– Signals penetrate paper and vinyl walls with little change to signal strength.

– Signals penetrate only one or two solid and pre-cast concrete walls without degrading signal strength.

– Signals penetrate three or four concrete and wood block walls without degrading signal strength.

– Signals penetrate five or six walls constructed of drywall or wood without degrading signal strength.

– Signals will likely reflect off a thick metal wall and may not penetrate it at all.

– Signals will likely reflect off a chain link fence or wire mesh spaced between 1 and 1 1/2 in. (2.5 and 3.8 cm). The fence acts as a harmonic reflector that blocks the signal.

• Install the antenna away from microwave ovens and 2-GHz cordless phones. These products can cause signal interference because they operate in the same frequency range as the device to which your antenna is connected.

Installing the Antenna

You can install the antenna on any flat vertical surface, on a pole, or on a ceiling. All hardware for mounting the antenna on a wall or ceiling is provided. If you intend to install your antenna on another surface, you must provide the appropriate hardware.

Mounting on a Vertical Surface

Follow these steps to mount your antenna on a vertical surface.

---

Step 1 Attach the antenna bracket to the antenna using the jam nut provided (Figure 1).

Figure 1 Antenna Bracket

 

Step 2 With the screen mesh washer between the two brackets, attach the antenna bracket to the mounting bracket using the spherical washer and wing bolt provided (Figure 2).

Figure 2 Antenna Bracket Attached to Mounting Bracket

 

Step 3 Determine the mounting location for the antenna.

Step 4 Attach the wall bracket to the wall using the two screws provided (Figure 3).

Figure 3 Wall Mounting

 

Step 5 Slide the mounting bracket onto the wall bracket and secure it in place (optional) with the two screws provided (Figure 4).

Figure 4 Attaching Mounting Bracket to Wall Bracket

 

Once the antenna is secured on the wall, you can adjust the azimuth and elevation.

Step 6 To adjust the azimuth and elevation, loosen the bolt that attaches the antenna bracket to the mounting bracket (Figure 5). Azimuth can be adjusted ±90 degrees. Elevation can be adjusted +15 degrees and -35 degrees.

Figure 5 Azimuth and Elevation Adjustment

 

---

 

Mounting on a Ceiling

To mount the antenna on a ceiling, follow these steps:

---

Step 1 Drill a hole in the ceiling approximately 1.25 in. in diameter.

Step 2 Fit the rubber gasket onto the bottom of the antenna.

Step 3 Insert the antenna shaft through the hole in the ceiling.

Step 4 Thread the jam nut onto the antenna shaft and tighten.

Figure 6 shows the ceiling mount process.

Figure 6 Mounting on a Ceiling

 

---

 

Connecting the Antenna to the Access Point

The AIR-ANT2544V4M-R has four cables with orange labels. The four cables can be connected to any of the four ports on the access point.

The AIR-ANT2544V4M-RS includes circuitry to enable self-identification of the antenna by the Cisco Catalyst 91xx Series access points. The antenna has three cables with orange labels and one cable with a purple label. The self identifying function is indicated by the purple label on this cable. Ensure that this antenna cable is connected to Port A on the AP, which is also designated by purple text around the RP-TNC connector. The AIR-ANT2544V4M-RS antenna has a built-in EEPROM that can be read by the AP to automatically configure the antenna type and gain in the wireless controller.

Suggested Cable

Cisco recommends a high-quality, low-loss cable for use with the antenna.

Note Coaxial cable loses efficiency as the frequency increases, resulting in signal loss. The cable should be kept as short as possible because cable length also determines the amount of signal loss (the longer the run, the greater the loss).