I had a chance to speak with David Mandelstam the CEO of Sangoma about his company's new ADSL 2+ networking card the S519 which provides an internal solution for people looking for DSL access sans modems. Asked why the card is needed, Mandelstam explained that one of the primary reasons for this product is its use in inverse multiplexing connections or being able to take disparate DSL lines and combining them together to become a single virtual broadband connection.
This new device compliments the current S518 ADSL card the company supplies but as you can imagine the new card allows greater broadband speeds. As Mandelstam emphasized to me the A in ADSL stands for asymmetrical and subsequently means that the upload and download speed of such service varies. Of course in a situation where you are looking to transmit many VoIP connections at once, you may need more bandwidth than what a single ADSL2+ line can provide.
So if one ADSL2+ line can give you a theoretical 24 megabits per second down and 3 megabits per second up, three combined together give you 72 Mbps download speed and 9 Mbps on the upload side.
David explains the low cost of ADSL let's say $50/month allows you to get a good amount of bandwidth for a combined $150/month. And if you have an aggregate upload speed of 4-5 megabits per second you can transmit about 30 VoIP calls at once.
Need other reasons to purchase an internal ADSL card? Mandelstam explains the limited buffer size of external devices can be improved upon with internal solutions where the internal RAM can act as a virtually limitless buffer. Obviously this functionality is great for VoIP and video applications.
One final reason to look for an internal broadband solution is when you don't want the complexity of an external product and although David didn't mention it, I would think an internal card would save power as well since no separate and wasteful power supplies are needed. And when customers buy and install Sangoma cards 10,000 at a time, a little power and complexity saved per install can add up quickly. Sadly, ADSL2+ is limited in the US but those of my readers in Europe, Canada and other parts of the world will be happy to know there is now a new way to get inexpensive, aggregated bandwidth for whatever applications they need to run.