A comparision of bandwidth - Canadian TV, Computing and Home Theatre Forums

wlee15 · 2008-04-27, 06:18 AM

I was reading through the comcast thread at another forum and the discussion move to the point of sattelite bandwidth because Comcast systems rely on sattelite to receive the bulk of the channels.

dr1394 has calculated that 40.46 Mbps per transponder for HD channels with 1 transponder typically carrying 3 HD channels which works out to about an average 13.48 Mbps per channel, so I wonder what the bitrate was for Canadian systems?

Symbol rate * Modulation system(if QPSK this is 2, 8PSK its 3) * FEC * Reed Solomon(188/204).

Starchoice/Shaw Broadcast Service/Shaw Cable
37.7 Mbps usually with 3 channels per transponder. (12.6 Mbps/channel avg)

Bell
30.7 Mbps usually with 2-3 channels per transponder. (10.2-15.3 Mbps/channel avg)

I_Want_My_HDTV · 2008-04-27, 01:49 PM

EV and Dish use the same technology so the systems are comparable. FEC differs between the two systems though. (I forget the numbers.) Dish is also being slightly more aggressive at rolling out 8PSK and MPEG4.

nicohockey9 · 2008-04-29, 05:16 PM

When Bell rolls out MPEG4 enventually we will notice a difference in bandwith.

tdti1 · 2008-04-30, 11:48 AM

Ya you will notice 10000 channels on a 5000 channel bandwidth hahaha.

2008-04-27, 06:18 AM	#1
wlee15 Join Date: Dec 2006 Posts: 124	A comparision of bandwidth I was reading through the comcast thread at another forum and the discussion move to the point of sattelite bandwidth because Comcast systems rely on sattelite to receive the bulk of the channels. dr1394 has calculated that 40.46 Mbps per transponder for HD channels with 1 transponder typically carrying 3 HD channels which works out to about an average 13.48 Mbps per channel, so I wonder what the bitrate was for Canadian systems? Symbol rate * Modulation system(if QPSK this is 2, 8PSK its 3) * FEC * Reed Solomon(188/204). Starchoice/Shaw Broadcast Service/Shaw Cable 37.7 Mbps usually with 3 channels per transponder. (12.6 Mbps/channel avg) Bell 30.7 Mbps usually with 2-3 channels per transponder. (10.2-15.3 Mbps/channel avg) Last edited by hugh; 2008-04-27 at 04:15 PM.

2008-04-30, 11:48 AM	#4
tdti1 Join Date: Jan 2005 Location: Montreal Posts: 908	Ya you will notice 10000 channels on a 5000 channel bandwidth hahaha. __________________ 4DTV DSR922 HDD 200 VC 2+ GI2500R VC 2 Pansat 2500a c/ku/dbs feed 10.6ft Clearview mesh AMC-8 to AMC-12 24"Venture.

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2008-04-27, 01:49 PM	#2
I_Want_My_HDTV . Join Date: Jan 2003 Location: London, ON Posts: 6,297	EV and Dish use the same technology so the systems are comparable. FEC differs between the two systems though. (I forget the numbers.) Dish is also being slightly more aggressive at rolling out 8PSK and MPEG4.

2008-04-29, 05:16 PM	#3
nicohockey9 Join Date: Mar 2008 Location: Montreal, QC, Canada Posts: 574	When Bell rolls out MPEG4 enventually we will notice a difference in bandwith.