MrJames
join:2003-05-19
Jacksonville, FL | 4.5mbps per channel??? quote:
deliver the video over DSL at speeds of 4.5mbps per channel
Are they providing 4.5mbps for each channel or is that for ALL channels combined? It reads a little differently in the article. For each channel that seems like a lot of bandwidth. If thats the case I don't see us getting this any time soon. |
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 jblake
join:2003-06-28
Calera, AL | it could be setup so that you are getting 4.5mbit and it only sends one channel at a time..pretty ingenious way to get around bandwidth issues that plauge cable and satellite operators, although I have always thought that point to point communications systems are a waste when broadcasing, because the server needs 4.5mbit of bandwidth for each and every subscriber, even if the traffic is the same. Total waste of bandwidth IMO |
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| reply to MrJames
Yep... its not like you can watch 3 channels at once. Logically, each set-top device uses its own 4.5mbps channel... and with the Far-East having dsl capable of 45mbps for $20... they could have as many TVs on at once as most familes do here in the US. |
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 tiger72SexaT duorPPremium
join:2001-03-28
Saint Louis, MO
kudos:1
 ·T-Mobile US
| reply to jblake
"although I have always thought that point to point communications systems are a waste when broadcasing, because the server needs 4.5mbit of bandwidth for each and every subscriber, even if the traffic is the same"
this is where multicasting technology comes in.
The server can send have a single outbound 4.5mbps stream, and the internet routers *should* do the rest.
--
low cost public gameservers.www.clanpubs.net |
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 OmegaDisplaced OhioanPremium
join:2002-07-30
Cheyenne, WY | reply to MrJames
Why can't my DSL go to 4.5mbps? |
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 starstuffFly By WirePremium
join:2001-12-05
Mcallen, TX | reply to jblake
said by jblake:
... broadcasing, because the server needs 4.5mbit of bandwidth for each and every subscriber, even if the traffic is the same. Total waste of bandwidth IMO
The server/receiver will transmit ( stream ) the video to all subscribers watching the same channel at once ( multicast ). The bandwidth being used is the client watching the tv channel other clients on the same network will not be affected.
There are very interesting issues here.
1. There is no need for encryption since the streamed data go from the isp's router to the client making the transmission more efficient.
2. With new video compression schemes the bandwidth could be a lot lower. |
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starstuffFly By WirePremium
join:2001-12-05
Mcallen, TX | reply to Omega
said by Omega:
Why can't my DSL go to 4.5mbps?
It can... Do you have $100~150/mo to spare? I know people that spend that much and more a month on beer 
»www01.sbc.com/DSL_new/content/1,···&RI=&RD= |
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| Unless he suffers from too far from CO...
Back to the news item, I am still somewhat bewildered that, to a degree, phone companies want to become cable companies and cable companies want to become phone companies... |
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| reply to MrJames
Yes, it's 4.5 Mbps per channel. They're doing this in multicast IP MPEG-2. Essentially, it's the same as digital cable here (HK), except using IP, rather than MPEG-2 over DVB-C (QAM).
Since PCCW owns the ATM infrastructure in Hong Kong, they can do pretty much whatever they want to with it. You can already get 6 Mbps ADSL to nearly every home in HK on PCCW's network, along with many other (faster) solutions from competing Fixed Telephone Network Systems operators (basically CLECs).
NOW Broadband TV is the first major deployment like this in Hong Kong, but YesTV (China Light & Power Telecom) started their competing service first. We also have a limited deployment from a third FTNS operator, Hong Kong Broadband (CTI). For a city with just over seven million people, and only slightly more than a million households that could receive this kind of service, competition is fierce. |
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