Cisco Cisco Aironet 3500p Access Point 백서
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White Paper
Cisco CleanAir Technology: Intelligence in Action
This white paper addresses the RF interference challenges that result from high
usage of a shared spectrum
usage of a shared spectrum
. With the introduction of the IEEE’s latest wireless
standard, 802.11ac, with its 80-MHz-wide channel bandwidth, these challenges
become more acute. It explores the limitations of standard Wi-Fi chip design and how
this affects the ability of an IT organization to gather critical, actionable data about the
wireless spectrum for effective troubleshooting. Finally, it introduces
become more acute. It explores the limitations of standard Wi-Fi chip design and how
this affects the ability of an IT organization to gather critical, actionable data about the
wireless spectrum for effective troubleshooting. Finally, it introduces
integrating RF intelligence into the network, users gain tremendous insight into actual
usage of the wireless spectrum. This insight is critical to proactively managing Wi-Fi
networks so that they can support the mission-critical and latency-sensitive
applications needed in today’s hospitals, distributed enterprises, manufacturing sites,
retail stores, and offices.
usage of the wireless spectrum. This insight is critical to proactively managing Wi-Fi
networks so that they can support the mission-critical and latency-sensitive
applications needed in today’s hospitals, distributed enterprises, manufacturing sites,
retail stores, and offices.
Wi-Fi Becomes Mission Critical
The first enterprise Wi-Fi networks were an added convenience used for web surfing in enterprise lobbies or
conference rooms. For these applications, a best-effort level of performance was acceptable.
Now Wi-Fi has matured to the point that it is being deployed for many mission-critical applications. Hospitals use
Wi-Fi for mobile access to patient files and to remotely monitor secondary bedside systems. In retail and
manufacturing, Wi-Fi is used for logistics and business transactions. Small branch offices are beginning to use
Wi-Fi as the exclusive network access method, forgoing wired connections. And increasingly, Wi-Fi is being used
for voice and video, which is sensitive to the impact of interference.
In all these examples, Wi-
Fi networks are expected to run with very high reliability. It’s no longer acceptable for
Wi-Fi networks to have unexpected downtime due to interference.
Defining the Solution
Spectrum intelligence (SI) is data about RF spectrum activity derived from advanced interference identification
algorithms similar to those used in the military. SI provides visibility into all the users of the shared spectrum - both
Wi-Fi devices and non-Wi-Fi interferers. For every device operating in the unlicensed band, SI reveals: What is it?
Where is it? How is it impacting the Wi-Fi network?
Spectrum management is the active use of spectrum intelligence data to improve performance and lower the
operational costs of Wi-Fi networks. Information about the severity and duration of interference can be used to
calculate its impact on the network and to troubleshoot problems. This information can also be stored for
back-in-time analysis and trending. Combined with contextual data such as physical location and systemwide
correlation, spectrum management is a powerful, proactive tool that increases WLAN reliability, performance,
and security.