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SonicOS Enhanced 4.0 Administrator Guide
• Primary WAN connection where wire-based connections are not available and 3G Cellular
is.
Wireless Wide Area Networks provide untethered remote network access through the use of
mobile or cellular data networks. While legacy cellular networks, such as GSM, were only able
to provide data rates of about 14 Kbps, today's emerging WWAN technologies (such as UMTS
and HSDPA) provide theoretical data rates of up to 10 Mbps, rivaling many wired technologies.
The cellular networks powering Wireless Wide Area Networking have been evolving very
quickly, and as a result comprise many different implementations. Fundamentally, they fall into
two protocols:
• GSM - Global System for Mobile Communication - The most widely used protocol
outside of the Americas. GSM is often regarded as less susceptible to signal degradation
indoors. Although GSM is used both in the Americas and the rest of the world, the American
implementation operates on a different frequency, and interoperability is not guaranteed
unless explicitly supported by the equipment.
• CDMA - Code Division Multiple Access - The most widely used protocol in the Americas.
CDMA has capacity advantages over GSM, but congestion tends to reduce its operating
range.
Understanding Wireless WAN Connection Models
The TZ190 provides flexible control over WAN connectivity with the WAN Connection Model
setting. Accessible from the Network > Interfaces page of the management interface, the
WAN Connection Model settings allows the administrator to precisely control the behavior of
the WWAN connection. The three settings are as follows:
• WWAN Only – For use when the WWAN is the only WAN connection in use on the TZ190.
• Ethernet Only – For use when the WWAN is to be disabled. The Ethernet WAN (the WAN
port, OPT port, or both) is the only WAN connection in use on the TZ190.
• Ethernet with WWAN Failover – For use when both the WWAN and the Ethernet WAN
(the WAN port, OPT port, or both) are to serve as WAN connections on the TZ190.
In addition to the WAN Connection Model setting, the following changes were also introduced
in SonicOS Enhanced 3.6 (and later versions) to optimize the operation of the WWAN interface:
• To more accurately reflect the operation of WAN load balancing and Failover sub-system,
the WAN Failover & LB page has been renamed to Ethernet LB.
• Failover between the Ethernet WAN (the WAN port, OPT port, or both) and the WWAN is
supported through the WAN Connection Model setting, but Load-balancing is currently
only supported on Ethernet WAN interfaces. WWAN interface traffic statistics will continue
to be displayed in the WAN Load Balancing Statistics table on the Network > Ethernet LB
page.
• The WAN Load-balancing and Failover sub-system is now permanently enabled for more
transparent support of the WAN Connection Model setting. This was previously controlled
by the Enable Load Balancing setting on the WAN Failover & LB page.
• WWAN interface probe monitoring appears on the WWAN > Settings page under the
WWAN Probe Settings heading. (Ethernet WAN interface probe settings is unchanged on
the Network > Ethernet LB page under the WAN Interfaces Monitoring section.)