Satellite Internet modem for VSAT Systems high speed satellite Internet 

Satellite Internet Modem

Revolutionary science behind the scenes

To understand the revolutionary nature of these satellite modems, a little history is in order.

Early broadband satellite solutions were built by piggybacking IP on top of (Digital Video Broadcast) DVB satellite technology, which was designed for television video.

That format uses MPEG for broadcasting video, and the Internet Protocal (IP) packets had to be dropped inside MPEG frame to be transported over DVB. Here's what that means on a practical level: MPEG cells are 188 bytes; the maximum sized Ethernet packet is 1,500 bytes.

Now here's the second part. IP traffic is bursty in nature. There's a short burst of information asking for data, followed by the download of that data, followed by a moment where that information is handled. Such a system can leave a lot of idle or wasted bandwidth on a dedicated SCPC (Single Channel Per Carrier) circuit.

To minimize that waste, the advanced iDirect satellite modem and broadband router uses a technique most known for use in cellular telephones, TDMA (time division multiple access), in a flavor called D-TDMA (Deterministic TDMA).

In a nutshell, the bandwidth gets allocated among mutliple remote sites, and that removes a lot of this downtime. And even though we'll skip the details here, this allocation of bandwidth can be taken to quite sophisticated levels. When you see references to quality of service, to committed information rate, remember it's based on this increased efficiency.

As explained elsewhere on this site, satellite communications are hampered by what's known as latency, and numerous techniques are used to provide acceleration. Thing is, most standard satellite systems can only accelerate in one direction -- the download.

Thanks to what's known as turbo-coding, a forward-error-correcting technique, transmission efficiency on these satellite Internet modems can be increased radically. More important in our case, however, is that Turbo Product Coding can accelerate traffic in both directions. And that's a big reason in the upload speeds we're able to offer.

Click here for more information on the technology behind the broadband satellite internet modem and router.

Click here for the satellite internet modem technical specifications.