Cisco Cisco 1900 2900 3900 Series 4-Port Gigabit Ethernet HS-WIC with PoE Installation Guide

The 4G-ANTM-OM-CM antenna requires a Cisco 3G EHWIC that uses a TNC-Male connector.

This antenna is designed to be mounted indoors on a ceiling. The antenna is mountable to ceiling tiles 
less than 1” thick or to hard ceilings with the included installation accessories.

Follow these guidelines to ensure the best possible performance: 

The antenna must be mounted to a ceiling to maximize its omnidirectional propagation 
characteristics. Mounting it on a wall may noticeably decrease the antenna range and overall 
performance.

Wherever possible, mount the EHWIC and antenna where the wireless devices would be within sight 
and avoid physical obstructions. Barriers along the line of sight between antenna and EHWIC 
degrades the wireless radio signals.

The density of the materials used in a building’s construction determines the number of walls the 
signal must pass through and still maintain adequate coverage. Consider the following before 
choosing the location to install your antenna: 

Paper and vinyl walls have very little effect on signal penetration. 

Solid and precast concrete walls limit signal penetration to one or two walls without degrading 
coverage. 

Concrete and wood block walls limit signal penetration to three or four walls. 

A signal can penetrate five or six walls constructed of drywall or wood. 

A thick metal wall or wire-mesh stucco walls causes signals to reflect back and cause poor 
penetration. 

Avoid mounting the antenna next to a column or vertical support that could create a shadow zone 
and reduce the coverage area. 

Keep the antenna away from reflective metal objects such as heating and air-conditioning ducts, 
large ceiling trusses, building superstructures, and major power cabling runs. If necessary, use an 
extension cable to relocate the antenna away from these obstructions. 

Install the EHWIC and any antennas away from appliances that share the same frequency bands. 
Microwave ovens, cordless telephones, and security monitors can temporarily interfere with wireless 
performance. 

We recommend you avoid installing wireless antennas in or near rack-mounted installations that include 
networking equipment and computer servers whose radiated noise emissions can severely degrade radio 
performance.