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This chapter is from the book

This chapter is from the book

Deploying Voice over Wireless LANsDeploying Voice over Wireless LANs

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This chapter is from the book

This chapter is from the book

Deploying Voice over Wireless LANsDeploying Voice over Wireless LANs

Learn More Buy

Security Systems

The ability for people to quickly report wrongdoings and suspicious activities is vitally important for providing security in all companies and organizations. A person equipped with a wireless phone, for example, can get critical information to the appropriate organization for it to respond to an emergency situation. For example, a security person in an airport can report the findings on an unattended piece of luggage, which would trigger a reaction from the airport security team. VoWLAN systems can certainly support these types of functions to bolster security through faster response to situations.

Companies can also deploy wireless security cameras that send video over wireless LANs. This approach is much more feasible than running wires to each camera. The ease of installation allows a greater number of cameras to be put in place, which increases the viewing of the different parts of a facility or campus.

A major issue with using wireless LANs for supporting wireless voice and video is that they are vulnerable to denial of service (DoS) attacks. A person wanting to disrupt the security system can block the flow of voice and video signals by jamming the network. For example, someone can transmit either an overriding RF signal or specialized protocols (such as multiple CTS frames having long NAV values) that block phones and cameras from accessing the network. Also, wireless video cameras are vulnerable to sniffing. For example, someone could passively monitor the video stream using a tool such as driftnet. Companies must consider these threats and plan accordingly.

Airport Improves Security with VoWLAN

Security personnel at a large airport in the southern United States continually walk throughout the airport looking for potential security issues and responding to passengers needing medical assistance. In the past, the security people would use two-way radios to communicate with a central security office, which would dispatch appropriate support staff in response to situations. The radios, however, were not reliable because of range issues. In some parts of the airport, the security agents would be too far away from the office to work effectively. In some cases, the range was so great that communications were not possible. In addition, the two-way radios were limiting, because only someone else having a two-way radio was able to communicate with the roving security personnel. Having someone use a phone to contact the mobile person was not possible.

Because of the need for improved security, the airport decided to take advantage of VoWLAN technology. A wireless LAN had to be put in place, but the airport had wanted to do so anyway to offer a public wireless LAN to passengers and other airport applications. It was much more cost-effective to build a common wireless LAN infrastructure for multiple applications. The public wireless LAN users could be kept separate from the airport applications, such as the VoWLAN solution for the security personnel, through the use of different VLANs.

Now, security personnel can immediately report incidents that need attention and receive a quicker response than before.

Metro Rail Monitor Tracks with VoWLAN

A city in the midwestern United States has a passenger rail system that moves people around various parts of the city. Before implementing a wireless, video-based monitoring system, the operator of the train had to keep an eye on track conditions and report findings to maintenance staff via an unreliable two-way radio, which often fell out of range from the maintenance office, or through a cell phone. Both ways, however, took a great deal of time. The operator was finding that performing other important tasks was difficult, such as driving the train and being alert to the safety of passengers.

The city equipped the train with Wi-Fi cameras on the front of each train and mounted access points periodically along the tracks. A maintenance person can now view the entire track as the train moves—saving the time of the operator and a maintenance person riding on the train. Problems with the track can now be found and repaired much faster, saving time of staff, and making the transport system safer for passengers.

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