[hpsdr] FW: Call for Comments and Discussion - OzyII

[alex]

yes but now only 3 meter length, i would wait until real tests have been 
done on speeds, still not as fast as 10Gb/s ethernet
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>> -----Original Message-----
>> From: Henry Vredegoor [mailto:henry.vredegoor at gmail.com] 
>> Sent: vrijdag 24 juli 2009 11:38
>> To: 'alex'
>> Subject: RE: [hpsdr] Call for Comments and Discussion - OzyII
>>
>>
>> Hi Alex, All,
>>
>> I think that used to be the limiting situation for USB.
>> I believe it was solved, and can now do simultaneous read and write.
>> This, together with Windows not doing (wanting to do?) 
>> Firewire properly is supposed to be one of the reasons for 
>> Firewire to not gain further  market share.
>> Hardware manufactures seem indeed to be moving away from 
>> Firewire in favor of USB 2.0
>>
>> What about USB 3.0: 
>>
>> 5 Gbit/s (super speed), or 400 Mbyte/s after protocol overhead
>>
>> Lots of other nice enhancements.
>>
>> http://en.wikipedia.org/wiki/Universal_Serial_Bus#USB_3.0
>>
>>
>> Henry. 
>>
>>
>>     
>>> -----Original Message-----
>>> From: alex [mailto:ajbr at btconnect.com] 
>>> Sent: vrijdag 24 juli 2009 11:05
>>> To: Henry Vredegoor
>>> Subject: Re: [hpsdr] Call for Comments and Discussion - OzyII
>>>
>>>
>>> you cant even get 480 Mb/s, it is only a claimed bandwidth, 
>>> you will be 
>>> lucky to get more than 20-30 MB/s (note MB not Mb), since 
>>>       
>> it is also 
>>     
>>> simplex unlike firewire and ethernet, so if you have 
>>>       
>> significant data 
>>     
>>> going the other way then it has to stop to "listen" before it 
>>> can "talk" 
>>> again which slows it down even more.
>>>
>>> if using duplex data such as rx and tx then firewire and 
>>> ethernet would 
>>> be better, they also use less resources so can get closer to 
>>> their spec 
>>> speed but the chip in ozy would be more expensive, also 
>>> windows doesn't 
>>> "firewire" properly
>>>
>>> firewire can also go much further than it is specified, a 
>>> friend of mine 
>>> who uses it for networking (can't be routed but can be used like 
>>> ethernet xover) uses 60m reliably
>>>
>>>
>>>       
>>>> Hi John, All,
>>>>
>>>> It would be nice to have a ball park figure about what we 
>>>>         
>>> are talking about
>>>       
>>>> with respect to _REQUIRED_ bandwidth for the highest 
>>>>         
>>> bandwidth application.
>>>       
>>>> Call it a kind of design specification.
>>>>
>>>> Another question could be if we really could generate data 
>>>>         
>>> at 1 Gbit/s with
>>>       
>>>> the rest of the HPSDR system hardware and software?
>>>> Some seem to doubt that.
>>>>
>>>> Is 480 Mbit/s a maximum or a minimum spec? Would a > 480 
>>>>         
>>> Mbit/s data rate be
>>>       
>>>> "allowed" for USB?
>>>>
>>>> Henry.
>>>>
>>>>
>>>>   
>>>>         
>>>>> -----Original Message-----
>>>>> From: hpsdr-bounces at lists.openhpsdr.org 
>>>>> [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of 
>>>>>           
>> John Melton
>>     
>>>>> Sent: vrijdag 24 juli 2009 9:56
>>>>> To: jeff millar
>>>>> Cc: hpsdr at openhpsdr.org
>>>>> Subject: Re: [hpsdr] Call for Comments and Discussion - OzyII
>>>>>
>>>>>
>>>>> ***** High Performance Software Defined Radio Discussion 
>>>>>           
>> List *****
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>>>>> I think the thing to remember is that one of the real reasons 
>>>>> for going 
>>>>> to ethernet is for the higher bandwidth that gig-e would give 
>>>>> us.  Using 
>>>>> a USB to ethernet dongle type of device would still restrict 
>>>>> you to the 
>>>>> USB limitations.
>>>>>
>>>>> -- John g0orx/n6lyt
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