Q
Problem solve Get help with specific problems with your technologies, process and projects.

# Solving wireless signal interference from brick walls

## Does having brick walls between my wireless router and PCI receiver pose any problems with the signal?

Does having brick walls between my wireless router and PCI receiver pose any problems with the signal?

Wi-Fi wireless routers and PCI cards exchange data using radio frequency (RF) transmissions in the 2.4 or 5 GHz bands. All radio waves gradually lose power as they are dispersed through the air; this is known as free-space path loss.

In addition, radio waves that encounter objects lose power as they are attenuated, reflected, refracted, diffracted, and/or scattered by those objects. For example, scattering occurs when a radio wave hits a rough surface (like brick), causing the wave to be reflected in many different directions at once, degrading the RF signal.

Airespace design notes estimate 2.4 GHz (802.11b/g) path loss for drywall at 4 dB, brick wall at 8 dB, and concrete wall at 10-15 dB. Loss is also impacted by how thick the wall is and whether it is dry or wet. Higher frequencies tend to experience higher loss, so 5 GHz (802.11a) path loss would probably be a little larger but still proportional.

So, what does all of this mean? Suppose your 802.11b wireless router and PCI card communicate at 11 Mbps up to 100 feet apart, separated by open space. Stick one sheetrock wall between them and that distance might drop to 50 feet. Stick one brick wall between them and that distance might fall to 30 feet. Data rates will drop from 11 to 5 to 2 to 1 Mbps with increasing distance and path loss, until eventually signal is too weak for useful communication. Your own "mileage" will vary, depending on both your products and physical environment.

## SearchNetworking

• ### How cloud-native networking will transform infrastructure

Cloud-native networking aims to prioritize business needs and enable networks to become more efficient. Learn more about the ...

• ### The role of network observability in distributed systems

Network observability sounds like a new term for an existing practice, but is that the case? This chapter excerpt lays out what ...

• ### Common network vulnerabilities and how to prevent them

It's not possible to eliminate all network vulnerabilities, but network teams can implement best practices to limit potential ...

## SearchUnifiedCommunications

• ### Microsoft update of Teams Rooms for Android falls short

Microsoft has yet to add to Teams Rooms on Android critical features available on the Windows version. Missing features include ...

• ### 5 steps to managing team collaboration apps

Team collaboration apps offer measurable productivity and cost benefits. Follow these five steps to address technical, security ...

• ### How to improve virtual collaboration in the enterprise

In the ideal team collaboration environment, technology enables a nuanced work experience while fading into the background. ...

## SearchSecurity

• ### Advice on how to prepare for the CompTIA Security+ exam

The CompTIA Security+ certification is a smart starting point for cybersecurity career hopefuls. Learn how to prepare for the ...

• ### Sample CompTIA Security+ exam questions and answers

The CompTIA Security+ exam covers a wide swath of topics, from threats to compliance to architecture. Test what you know about ...

• ### Threat intelligence frameworks to bolster security

Organizations have many threat intelligence frameworks to work with, each with its own advantages. From for-profit to nonprofit, ...

Close