You have several servers, mail, citrix, etc. They use public IPs from the IP block from your ISP. They are behind an ASA 5500 on a T1 circuit. You want to backup the T1 connection with a cable ...
Errr, reliability mostly, but T1's go out all the time if you lease them throught the wrong provider. Same goes for DSL. Bandwidth throughput purely depends on the backbone its hooked into and how ...