http://www.pcmag.com/article2/0,4149,14443,00.asp The Pro800turbo can use the two broadband connections in several different ways. Each connection can be designated as a normal or backup connection. This can be great for spreading out large, multiple connections. In normal mode, the Pro800turbo performs load balancing, spreading the Internet traffic over the two connections. If instead you designate one connection as the primary and the other as the backup, the backup takes over only when the primary connection goes down. (Since each of the two broadband connections has a different IP address, you cannot combine the bandwidth into one superfast connection, however.)
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http://www.pcmag.com/article2/0,4149,14443,00.asp
The Pro800turbo can use the two broadband connections in several different ways. Each connection can be designated as a normal or backup connection. This can be great for spreading out large, multiple connections. In normal mode, the Pro800turbo performs load balancing, spreading the Internet traffic over the two connections. If instead you designate one connection as the primary and the other as the backup, the backup takes over only when the primary connection goes down. (Since each of the two broadband connections has a different IP address, you cannot combine the bandwidth into one superfast connection, however.)