Extricom EXRP-20E, Руководство пользователя

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The Extricom WLAN System User Guide 15
Figure 12: Switch Cascade With AP Redundancy
It is also possible to deploy the APs in a semi-mesh, according to the degree of service required in
the event of a failover. In a semi-mesh deployment, most APs are configured as in Figure 12, but
one or more APs from the Primary are placed in the coverage area of the secondary, or vice versa.
In a switch cascade, the secondary switch routes all of the traffic from its APs to the primary switch
over the interconnect cable. The primary switch performs the full set of Extricom edge switch
functions on the secondary switch’s traffic, as well as on traffic from its own APs. The same is true
for traffic downloaded to the APs: the primary switch performs the Extricom edge switch functions,
such as determining to which AP to transmit each packet, and the secondary switch routes the traffic
it receives to the correct AP.
Heartbeat checks are performed over the LAN links. A failover takes place if there is a critical
failure of one of the switches, one of the LAN links, or in the interconnect.
Extricom Support for 802.11n
802.11n is a breakthrough technology that enables Wi-Fi networks to do more, faster, over a larger
area. 802.11n Wi-Fi provides optimized connectivity for enterprise computer networking, delivering
the range, bandwidth, and performance that multimedia applications and products demand.
For 802.11n deployment, Extricom offers the EXRP-30n, and EXRP-40En APs. The EXRP-30n
contains two 802.11a/b/g/n radios and one 802.11a/b/g radio, and the EXRP-40En contains two
802.11a/b/g/n radios and two 802.11a/b/g radios.
All current Extricom switches support 802.11n. However, for new 802.11n deployments, the Multi
Series 1000 platform (EXSW-1600/800G) is recommended because of its GbE capability which
takes full advantage of the GbE capability of the EXRP-30 and 40En.