Extricom EXRP-20E, Руководство пользователя

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The Extricom WLAN System User Guide 5
Same band operation
The Extricom WLAN system enables WLAN channels, in the same band (e.g. Channel 1, 6, and
11 in 2.4 GHz), to be simultaneously used within the same AP, to form overlapping Channel
Blankets using the same physical set of APs. It is possible
to configure up to four channels of
same band when using EXRP-40/40E/40En APs.
TrueReuse bandwidth
TrueReuse technology multiplies the bandwidth of a standard 802.11 channel by dynamically
optimizing the reuse of each frequency. Within a Channel Blanket, up to three APs are
permitted to simultaneously transmit on the same channel, when the TrueReuse algorithm
determines that they can do this without causing each other co-channel interference.
Zero-latency mobility
In an Extricom WLAN, wireless device remains on the same channel everywhere within the
Channel Blanket. Inter-AP handoffs delays or packet loss do not occur as the client moves
across the range of different APs.
Wi-Fi Collaboration
Extricom’s patented Wi-Fi Collaboration technology in which all APs are able to receive on the
same channel, provides uplink path diversity for client transmissions, making the system highly
resistant to RF instabilities and outside interference.
Dense AP deployment
In an Extricom WLAN, APs can be deployed in any density convenient to the enterprise, to
achieve both blanket coverage and a guaranteed communications rate to all users. In fact, while
cell-based
solutions shy away from dense deployments because of their inherent RF obstacles,
Extricom’s system performance actually increases with AP density .
Wire-line quality VoWLAN
Extricom’s Interference-Free architecture is perfectly suited for VoWLAN providing
zero-latency mobility, voice and data separation, reduced power consumption, and high RF
resiliency, all together resulting in superior voice performance.
IEEE 802.11n
Extricom architecture supports 802.11n both in the 2.4 GHz and in the 5GHz bands, using both
20MHz and 40MHz wide channels. The advantages of Extricom’s architecture are numerous in
the 802.11n setting. Among them is the unique ability to deliver full-bandwidth performance in
the 2.4GHz band, to both 802.11n and 802.11b/g devices. By contrast, cell-planning
architectures cannot be used with 802.11n 40MHz channel-bonding, since the number of non
overlapping channels is insufficient for this.
IEEE 802.11i support
Extricom’s products support WEP-64, WEP-128, WPA-TKIP, WPA2-AES (CCMP)
encryption. The authentication modes supported include: RADIUS (802.1x) and WPA
Pre-Shared Key (PSK).
Power save
Full power conservation management is enabled for associated mobile devices over unicast,
multicast, and broadcast frames. This is based on various IEEE 802.11 standard power-save
specifications such as PS-Poll and U-APSD for 802.11a/b/g devices, and SM & U-PSMP power
save for 802.11n devices.