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WiNG How-To Guide 3G WAN

Saturday, February 15, 2014 9:00 PM
Introduction:
3G or 3rd Generation is a family of standards for mobile telecommunications defined by the International Telecommunication Union which includes GSM, UMTS, CDMA as well as DECT and WiMAX. Compared with 2G or 2.5G, 3G offers simultaneous speech and data services and improved data rates allowing network operators to offer a wider range of advanced services to subscribers while achieving greater network capacity through improved spectral efficiency.
3G Applications:

3G WAN support is available on the RFS4000/RFS6000 WLAN Switch Controllers running WiNG 4.1.0.1 and above and can be deployed to provide primary Internet access at a remote site or Internet failover in the event of a primary wireline Internet service failure.

Primary Internet Access:
For primary Internet access the 3G WAN card provides the primary outbound path for the site to the public Internet. Once connected the 3G card interface will receives network addressing from the service providers DHCP server and the WLAN Switch Controller will use the service provider’s upstream router as its default route.

For primary Internet access a NAT rule must be defined that translates internal private addresses to the Public IP address assigned to the 3G interface. Note that unlike virtual IP interfaces, the 3G interface is automatically designated as a NAT outside interface.

Internet Failover:
For Internet failover the 3G WAN card provides a backup Internet path to a wireline Internet service directly connected to the WLAN Switch Controller. During normal operation the WLAN Switch Controller will use the wireline Internet service and all outbound Internet traffic will be forwarded to the wireline service provider’s router. The wireline service provider’s router is dynamically or statically defined as the WLAN Switch Controller’s default router.
To detect a wireline Internet service failure the WLAN Switch Controller monitors the state of the default router will failover to the 3G interface if the default router becomes unreachable. Outbound Internet will failover to the 3G interface if:
1)  The physical port that the default router is connected through goes down.
2)  The default router is no longer reachable by the WLAN Switch Controller.

If the wireline service provider’s router becomes unreachable, the WLAN Switch Controller will dynamically update the NAT rule to use the 3G interface as well as dynamically update the routing table so that the 3G WAN service provider’s upstream router becomes the default gateway for the WLAN Switch Controller. All outbound traffic destined to the public Internet will then be forwarded via the 3G interface.

3G WAN Express Card Support:
3G WAN Express cards are available from a number of service providers in each region and each card will require a data service plan from a service provider. The available data service plans vary by region and service provider and can ether permit unlimited data transfer or limited data transfer over the service providers 3G network. Service provides may also apply overage fees when a specific amount of traffic has been exceed.

The following table provides a list of supported 3G WAN Express cards supported by the RFS4000/RFS6000 WLAN Switch Controllers available by region and service provider. Before selecting a3G Express card it is recommended that you reference the latest release notes for the latest list of supported cards as new models are being continuously introduced into the market.

3G Bandwidth:
The amount of throughput available over a 3G service provider’s network will vary depending on the 3G technology and each service provider’s implementation. The current generations of 3G access technologies are fully capable of providing comparable throughput to wireline based Internet services, however the radio technologies, backbone and Internet capacity core will ultimately determine the actual amount of throughput that is available at each branch site.
The following table lists the theoretical peak uplink and downlink throughputs that are for each 3G wireless access technology. The actual throughput and performance at a branch site will vary based on the distance of the 3G card from the cellular base station, interference and each service provider’s specific 3G implementation.


3G Performance:
3G WAN performance at a site will also be impacted by number of physical factors including the antenna orientation, distance between the antenna and cellular base station, physical obstructions and external radio frequency (RF) interference.
The 3G Express card will be physically installed in the RFS4000/RFS6000 WLAN Switch Controller and thus the coverage will vary at the site depending on where the RFS4000/RFS6000 WLAN Switch Controller is physically installed at the site.Prior to deployment it is strongly recommended that a walkthrough of the site be performed with the 3G Express card installed in a notebook PC to determine if adequate 3G signal strength is available where the RFS4000/RFS6000 WLAN Switch Controller is to be installed. If the 3G signal is low, the RFS4000/RFS6000 WLAN Switch Controller may need to be moved to an alternative location where the 3G signal is improved.The following table provides a coverage estimate based on signal strength in decibels per milliwatt (dBm).


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