eXDee: I can't remember if anyone supports port bonding on UBS, perhaps on a LLU connection, but it would probably be cheaper to rent a 2nd phone line and use a load balancing router/firewall box accross 2 ADSL connections.
jdgamez: is there any isp in newzealand that support combinding multiple adsl lines into one big pipe to get faster speeds.
cyril7: Draytek also have a series of dual wan routers some with built in adsl modems, others can use USB for vodem type devices. These can be used for failover, or load balance type setups.
RalphFromSnap: The Draytek and the Pepelink products are similar - but do IP load balancing. So open new connections up on the least congested link.
If you have 2x ADSL links, say both at 10mbit. You will never exceed 10mbit in any single transaction, for applications such as Bit Torrent, you won't notice this - however for HTTP and FTP etc, you will be stuck with 10mbit.
Our method is different, and load balances accross the two connections, if you are downloading a single stream of HTTP at 400kb/s it will be using both links at 200kb/s each rather than 1 at 400kb/s and the other at 0kb/s.
The usual reason for doing this is not for downstream, but for upstream. Which is where our implementation is much stronger.
Wouldn't bonded ADSL be pointless? Given for just about everything interesting you are limited to what international bandthwidth your ISP and their route can give you which is pretty much always much less than what you sync with your exchange or cabinet at.