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<div class="moz-cite-prefix">On 1/11/18 9:58 PM, Stephen Worthington
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:jpeltdh918o3q9mc5o95hhfas5u34m7gh4@4ax.com">>
"100baseTX high-speed network"
<pre class="moz-quote-pre" wrap="">
So it only has 100 Mbit/s Ethernet. So with four tuners, each recording multiple HD channels at once, you would be using a significant percentage of the 100 Mbit/s bandwidth.So I would want
to have each Quatro on its own Ethernet card, if I was directly connecting them to a card. </pre>
</blockquote>
<p>I can't find NZ data, but here's some overseas info</p>
<p><span style="color: rgb(66, 66, 66); font-size: 13.2px;
font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; letter-spacing: normal; text-align:
left; text-indent: 0px; text-transform: none; white-space:
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255); text-decoration-style:
initial; text-decoration-color: initial; display: inline
!important; float: none;">Ofcom plans to put 4x HD 720p channels
on mux B. The total bandwidth is 27.2 Mbit/s which gives us 6.8
Mbit/s per channel. Ofcom say that this is mitigated by a 15%
stat mux gain which gives us 7.82 Mbit/s per channel.<span> <br>
From
<a class="moz-txt-link-freetext" href="http://www.bbc.co.uk/blogs/bbcinternet/2009/06/whats_happening_with_freeview.html">http://www.bbc.co.uk/blogs/bbcinternet/2009/06/whats_happening_with_freeview.html</a></span></span></p>
<p><br>
<span style="color: rgb(66, 66, 66); font-size: 13.2px;
font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; letter-spacing: normal; text-align:
left; text-indent: 0px; text-transform: none; white-space:
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255); text-decoration-style:
initial; text-decoration-color: initial; display: inline
!important; float: none;"><span><span style="color: rgb(0, 0,
0); font-size: 15px; font-style: normal;
font-variant-ligatures: normal; font-variant-caps: normal;
letter-spacing: normal; text-align: left; text-indent: 0px;
text-transform: none; white-space: normal; word-spacing:
0px; -webkit-text-stroke-width: 0px; background-color:
rgb(255, 255, 255); text-decoration-style: initial;
text-decoration-color: initial; display: inline !important;
float: none;">24 Mbit/s used to carry actual content.</span><span
style="color: rgb(0, 0, 0); font-size: 15px; font-style:
normal; font-variant-ligatures: normal; font-variant-caps:
normal; letter-spacing: normal; text-align: left;
text-indent: 0px; text-transform: none; white-space: normal;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255); text-decoration-style:
initial; text-decoration-color: initial; display: inline
!important; float: none;"><br>
</span>From
<a class="moz-txt-link-freetext" href="https://forums.digitalspy.com/discussion/344453/hd-channel-bandwidth">https://forums.digitalspy.com/discussion/344453/hd-channel-bandwidth</a>
seems to be UK again<br>
</span></span></p>
<p><img style="-webkit-user-select: none;"
src="http://www.astra2sat.com/wp-content/uploads/2016/11/PSB1-Bitrates.jpg"><br>
</p>
<p>and<br>
<span style="color: rgb(0, 0, 0); font-size: 15.84px; font-style:
normal; font-variant-ligatures: normal; font-variant-caps:
normal; letter-spacing: normal; text-align: start; text-indent:
0px; text-transform: none; white-space: normal; word-spacing:
0px; -webkit-text-stroke-width: 0px; background-color: rgb(255,
255, 255); text-decoration-style: initial;
text-decoration-color: initial; display: inline !important;
float: none;">For HD programmes, the BBC use H.264 coding, with
an average bitrate of 3.2Mbps and 192 kbps audio.</span><br
style="margin: 0px; padding: 0px; color: rgb(0, 0, 0);
font-size: 15.84px; font-style: normal; font-variant-ligatures:
normal; font-variant-caps: normal; letter-spacing: normal;
text-align: start; text-indent: 0px; text-transform: none;
white-space: normal; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color: rgb(255, 255,
255); text-decoration-style: initial; text-decoration-color:
initial;">
<span style="color: rgb(0, 0, 0); font-size: 15.84px; font-style:
normal; font-variant-ligatures: normal; font-variant-caps:
normal; letter-spacing: normal; text-align: start; text-indent:
0px; text-transform: none; white-space: normal; word-spacing:
0px; -webkit-text-stroke-width: 0px; background-color: rgb(255,
255, 255); text-decoration-style: initial;
text-decoration-color: initial; display: inline !important;
float: none;">HD programmes use about 1.5 gigabytes per hour of
video.</span><br>
from <a class="moz-txt-link-freetext" href="http://www.astra2sat.com/televison/tv-bitrates/">http://www.astra2sat.com/televison/tv-bitrates/</a><br>
</p>
<p><br>
</p>
<p>To summarise, each channel is using under 10 Mbit of data all the
time. So a 100 Mbit link should handle 10 channels at once. Your
points about gigabit being 10x 100 Mbit are fine and valid and I
concur.<br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:jpeltdh918o3q9mc5o95hhfas5u34m7gh4@4ax.com">
<pre class="moz-quote-pre" wrap=""> And they could use a better protocol that had error recovery.</pre>
</blockquote>
<p>Why? You're not moving precious bits, you're moving live
streaming TV. Its not supposed to be perfect, its supposed to be
on-time.</p>
<p>If your local LAN is losing enough frames to cause issues, then
changing to an error recovery protocol will make it even more
delayed in local transmission. This would be worse than losing
the odd bit.<br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:jpeltdh918o3q9mc5o95hhfas5u34m7gh4@4ax.com">
<pre class="moz-quote-pre" wrap="">The other major problem to watch out for is that their wall-wart power supplies always fail with age, and they also cause strange problems as
they start failing, so it can take ages to work out what the problem is. If I was ever to buy a SiliconDust device, I would consider
replacing the power supply immediately with a known good one.</pre>
</blockquote>
<p>This is reasonable. It would be perfectly okay to run a 12V line
from a molex plug out the back of the case, then into an adapter
and into your hdhomerun.</p>
<p><br>
</p>
<p><br>
</p>
<p>-- </p>
<pre class="moz-signature" cols="72">Criggie
<a class="moz-txt-link-freetext" href="http://criggie.org.nz/">http://criggie.org.nz/</a>
</pre>
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