Triple Play Data
This white paper by Teresa Mastrangelo, Principal Analyst at The Windsor Oaks Group LLC includes a useful table about bandwidth requirements for various broadband services. It’s not wildly wrong, although she doesn’t clearly state all her assumptions.
A few corrections: VoIP using the G.711 CODEC requires about 120 Kbps per stream when you include all relevant overhead. Her 64 Kbps is the raw sampling rate before the packets are wrapped in IP, UTP, and RTP headers. For great sound quality you want a short sampling period, such as 10 milliseconds. For successful fax, you probably will go as low as 5 millisecond samples.
As you reduce the sample size, the amount of overhead due to IP, UTP and RTP protocol wrappers escalates a lot.
Her table also gets HDTV required bandwidth wrong in my opinion. My planning number for MPEG-4 (or Windows Media 9) encoded high-definitioan TV is 10 Mbps.
Mastanggelo’s table might lead you to the conclusion that 100 Mbps per residence is enough. To understand why that’s an incorrect conclusion, read this Cloudy Thinking note.
[via ConvergeDigest]