[mythtv-users] HDHomeRun Quatro: any bandwidth issues?

[Stephen Worthington]

On Thu, 3 May 2018 07:52:25 -0400, you wrote:

>
>> On May 3, 2018, at 6:26 AM, Stephen Worthington <stephen_agent at jsw.gen.nz> wrote:
>> 
>> On Wed, 2 May 2018 23:56:42 -0500, you wrote:
>> 
>>> On Wed, May 2, 2018 at 10:32 PM, Marco Nelissen <marco.nelissen at gmail.com>
>>> wrote:
>>> 
>>>> The HDHomeRun Quatro has 4 ATSC tuners, but only a 100Mbit network port.
>>>> In theory that should be enough, but is it, in practice? Anyone ever run
>>>> into any network bandwidth issues with the Quatro? Would I be better off
>>>> getting two dual-tuner models, to spread the load? (the tuner(s) would be
>>>> connected to a gigabit switch, and the rest of my network is all gigabit)
>>>> 
>>>> 
>>>> ?Don't see why it would be an issue..  21Mb/s is max on ATSC 1080i..
>>> That's 84 total.
>>> 
>>> -Greg?
>> 
>> If multrec is supported with HDHRs, then 100 Mbit/s will not be
>> adequate.  Worst case with multirec you can be downloading all the
>> channels from each multiplex, all at the same time.  I am not sure
>> what the full bandwidth of an ATSC multiplex is, but more than two of
>> them at once will certainly be more than 100 Mbit/s.  I can see why
>> the original HDHRs were 100 Mbit/s, but I find it incredibly stupid
>> for them to still be making new ones that are only 100 Mbit/s.  And
>> quite insane when they have four tuners.
>
>Sorry, but you are completely wrong.  An ATSC transport stream carries up to 19.39 megabits of data per second.  If there are multiple programs in the stream, they have to carve up that bandwidth.   See:
>
>https://en.wikipedia.org/wiki/ATSC_standards#MPEG-2
>
>A 100/Mbits per second ethernet link is quite adequate.
>
>Craig
>Seriously, did you think the SiliconDust guys couldn’t figure this out?  Sheesh.

Wow!  ATSC is using only 6 MHz bandwidth!  No wonder the bit rate is
that low.  Here in New Zealand, DVB-T uses 8 MHz channels.  So 100
Mbit/s Ethernet would work, just.  It is still not a good idea when
the rest of your network is Gbit Ethernet.