[mythtv-users] HD Choppy or Jerky

Sun Feb 2 01:10:42 UTC 2014

On 2/1/14, 7:16 PM, Hika van den Hoven wrote:
> Hoi Stephen,
>
> Sunday, February 2, 2014, 1:05:00 AM, you wrote:
>
>
>> On 2/1/14, 6:58 PM, Hika van den Hoven wrote:
>>> Hoi Stephen,
>>>
>>> Sunday, February 2, 2014, 12:42:43 AM, you wrote:
>>>
>>>
>>>> On 2/1/14, 6:26 PM, Hika van den Hoven wrote:
>>>>> Hoi Mike,
>>>>>
>>>>> Sunday, February 2, 2014, 12:01:50 AM, you wrote:
>>>>>
>>>>>> On 01/02/14 22:45, Dick Steffens wrote:
>>>>>>> On 02/01/2014 12:13 PM, Doug Lytle wrote:
>>>>>>>> Dick Steffens wrote:
>>>>>>>>> CAT-5 cable, and 10/100 Ethernet. I don't use the wireless side of the
>>>>>>>>> router.
>>>>>>>> You'll really want to be gigabit for HD.
>>>>>>> Are you saying that I need gigabit Ethernet between my HDHomeRun Prime and the
>>>>>>> machine doing the recording, or playing the program live?
>>>>>>>
>>>>>>> Would it work to have gigabit between the HDHomeRun Prime and the machine doing
>>>>>>> the recording, then copy the recorded file to the machine connected to the TV
>>>>>>> and have a stable playback?
>>>>>>>
>>>>>>> Very rarely do we watch live TV anymore. The Super Bowl, tomorrow, is probably
>>>>>>> the only thing we plan to watch live. Mostly we record what we want to see and
>>>>>>> then watch it later. If I set up a backend connected by gigabit Ethernet to my
>>>>>>> HDHomeRun Prime to do the recording, but transferred those recordings over
>>>>>>> 10/100 Ethernet to the playback machine, should that work? It would be very
>>>>>>> impractical to run better than CAT-5 cable to where the TV sits. Or can gigabit
>>>>>>> Ethernet work on CAT-5 cable. (I haven't kept up to date on cable. Last I knew
>>>>>>> there was CAT-5e cable, but I don't have any of that in my house.)
>>>>>>>
>>>>>> You /can/ use Cat-5 cable for Gigabit, I do it myself at one or two points
>>>>>> within my networks. The issue is the quality of the cable. What you might get
>>>>>> away with using, say, a commercially-made patch cable might not work where you
>>>>>> have runs around rooms/ducting/etc with sharp turns and indifferent termination
>>>>>> at the sockets.
>>>>>> There is also Cat-6 cable, but despite having a larger number Cat-5e is
>>>>>> perfectly adequate for Gigabit (something shop assistants don't seem to be aware
>>>>>> of).
>>>>>> You /can/ run HD over 100 Mbit ethernet but a lot will depend on your setup.
>>>>>> Buffer sizes in your switches, for example. The bit rate of your video, many
>>>>>> other factors. Gigabit just makes HD that bit easier to handle without having to
>>>>>> tune everything.
>>>>> I've never had problems with cat5. The main difference is that 10/100
>>>>> only uses 4 of the 8 wires (pair 1,2 up and pair 3,6 down) Gbit uses
>>>>> all 8. To preserve quality prevent bending the cable. every pair is
>>>>> twisted around each other to prevent interference. Bending might
>>>>> disturb this twisting. Also for longer stretches you best have cable
>>>>> with solid wiring, which is less flexible than twined cable, but has
>>>>> lower resistence.
>>>>>
>>>>> Tot mails,
>>>>>   Hika                            mailto:hikavdh at gmail.com
>>>>>
>>>>> "Zonder hoop kun je niet leven
>>>>> Zonder leven is er geen hoop
>>>>> Het eeuwige dilemma
>>>>> Zeker als je hoop moet vernietigen om te kunnen overleven!"
>>>>>
>>>>> De lerende Mens
>>>>> --
>>>>>
>>>>> _______________________________________________
>>>>>
>>>> I've occasionally had problems with cat5 running longer gigabit runs,
>>>> haven't had any problems with cat5e though.
>>>> I also tend to stay with hard wire, rather than stranded.
>>>> _______________________________________________
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>>>> mythtv-users at mythtv.org
>>>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>>> Thanks for the proper english/american wording, I literally translated
>>> from dutch. But for short cable (max 2m, computer to outlet) that might
>>> bend now and then, stranded might last longer without damaging the
>>> twisting or even one of the wires. Hard wire should never bend more
>>> then 20-30 degrees.
>>>
>>> Tot mails,
>>>   Hika                            mailto:hikavdh at gmail.com
>>>
>>> "Zonder hoop kun je niet leven
>>> Zonder leven is er geen hoop
>>> Het eeuwige dilemma
>>> Zeker als je hoop moet vernietigen om te kunnen overleven!"
>>>
>>> De lerende Mens
>>> --
>>>
>>> _______________________________________________
>>>
>> Are you saying that I'm wrong to wrap the hard cable around a pencil a
>> few dozen times?   ;)
>> Seriously, quite true. Tighter bends tend to push the twisted wires
>> apart, lessening the noise rejection capability of the cable and
>> increasing noise within the cable itself from adjacent strands that are
>> also separated.
>> The downside of hard wire cables is that it can easily kink when feeding
>> it, giving it those sharp twists that one should avoid.
>> Still, I'm still trying to find the proper cable to use my cable
>> stretcher on, for when the run isn't *quite* long enough.*
>
>> *Yes, I'm one of those nice guys who send the FNG off to get the cable
>> stretcher on his first day at work.  ;)
>> _______________________________________________
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>> mythtv-users at mythtv.org
>> http://www.mythtv.org/mailman/listinfo/mythtv-users
>
> If you want real quality... there is an unofficial standard they call
> cat7 it's like stp but with every pair shielded. It comes with special
> walloutlets (a square of four connectors, for each pair one) where you
> can choose which pairs to use. The cables come in 1, 2 or 4 pairs with
> rj11 or rj45 or even audio or coax etc on the other side.
> We had it in part at the greenpeace headquaters in Amsterdam. It could
> be it's only available her in the Netherlands.
>
> Tot mails,
>   Hika                            mailto:hikavdh at gmail.com
>
> "Zonder hoop kun je niet leven
> Zonder leven is er geen hoop
> Het eeuwige dilemma
> Zeker als je hoop moet vernietigen om te kunnen overleven!"
>
> De lerende Mens
> --
>
> _______________________________________________
>
Category 7 cable and connectors are available, but the standard has yet
to be approved.
Either way, it's rather a moot point currently, as currently, the
highest common switch in the consumer realm is only gigabit.
Still, it'll be an interesting world when we get 10 gigabit or greater
to the desktop!

We used something quite similar with category 5 and 6 cabling in the US
DoD, as the cable and connectors had to be shielded.
Then, ran through sealed conduit and a bunch of other requirements for
TEMPEST standards.