Re: Packet delivery on a Ethernet Wire

gets even better when you go 40gb and 100gb

http://etherealmind.com/notes-physical-connectors-40-100-gigabit-ethernet/

 --
Garry L. Baker

"With sufficient thrust, pigs fly just fine..." - RFC 1925

On Sun, Jul 31, 2011 at 2:50 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> I stand corrected, in 1000BASE-T there are 4 bidirectional signal paths,
> so it's basically a parallel interface.
>
> Sorry about that.
> -Carlos
>
> Aaron Riemer @ 31/07/2011 05:36 -0300 dixit:
>
> Yep. However just doing some reading it looks like Gigabit copper
>> (1000BaseT) uses all four pairs and this link seems to suggest that data
>> is
>> sent in parallel.
>> http://www.cisco.com/en/US/**tech/tk389/tk214/tech_**
>> digest09186a0080091a86.html<http://www.cisco.com/en/US/tech/tk389/tk214/tech_digest09186a0080091a86.html>
>>
>> "1000BASE-T works by using all four of the Category 5 pairs to achieve
>> 1000
>> Mbps operation over the installed Category 5 copper cabling. 1000 Mbps
>> data
>> rates are achieved by sending and receiving a 250 Mbps data stream over
>> each
>> of the four pairs simultaneously (4 X 250 Mbps = 1 Gbps)."
>>
>>
>>
>> Cheers,
>>
>> -Aaron.
>>
>>
>>
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> Irfan Sid
>> Sent: Sunday, 31 July 2011 1:02 PM
>> To: Aaron Riemer
>> Cc: Carlos G Mendioroz; Cisco certification; Cisco certification
>> Subject: Re: Packet delivery on a Ethernet Wire
>>
>> So does that mean that in copper wire, you have two paths ie full duplex,
>> one for transmit and one for recieve. One pair of the copper will be
>> dedicated to tansmit and one to recieve. Each path transmitting serially.
>>
>> On Fibre its the same, you have two fibre's one for transmit and one for
>> receive and data is transmitted serially on them.
>>
>> Is this correct?
>>
>> On Thu, Jul 28, 2011 at 6:07 AM, Aaron Riemer <ariemer_at_amnet.net.au>
>> wrote:
>>
>> My apologies. I must have misread.
>>>
>>> http://en.wikipedia.org/wiki/**Data_transmission<http://en.wikipedia.org/wiki/Data_transmission>
>>>
>>> Thanks for clearing that up.
>>>
>>> Cheers,
>>>
>>> -Aaron.
>>>
>>> -----Original Message-----
>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>>> Carlos G Mendioroz
>>> Sent: Thursday, 28 July 2011 12:27 AM
>>> To: Aaron Riemer
>>> Cc: 'Irfan Sid'; 'Cisco certification'; 'Cisco certification'
>>> Subject: Re: Packet delivery on a Ethernet Wire
>>>
>>> Aaron,
>>> copper has "pairs" because you use one wire as a reference to the other.
>>> But there is only one signal path (each way), and it works serially.
>>> -Carlos
>>>
>>> Aaron Riemer @ 27/7/2011 4:09 -0300 dixit:
>>>
>>>> Hi Irfan,
>>>>
>>>> I believe with copper Ethernet (100BaseTX for example) since there are
>>>> copper "pairs" the data is sent in parallel. I would assume the only way
>>>> parallel data transmission would work with fibre is if a different band
>>>>
>>> of
>>>
>>>> light is used (CWDM for example).
>>>>
>>>> Queuing on the router/switch only affects packets within the router
>>>>
>>> itself
>>>
>>>> and has no bearing on packets along the wire (unless they are dropped).
>>>>
>>>> Tools such as compression / LFI / DSCP marking are examples of the
>>>>
>>> router
>>
>>> manipulating the packets in some way before transmission out an
>>>>
>>> interface.
>>>
>>>> Cheers,
>>>>
>>>> -Aaron.
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>>>> Irfan Sid
>>>> Sent: Wednesday, 27 July 2011 1:48 PM
>>>> To: Cisco certification; Cisco certification
>>>> Subject: Packet delivery on a Ethernet Wire
>>>>
>>>> This maybe a stupid question would appreciate if someone can clearify:
>>>>
>>>> Are Ethernet packets delivered serially on the physcial medium ie copper
>>>>
>>> or
>>>
>>>> fibre - one after another in one single file or line if you will. Or are
>>>> they delivered in parallel ie. two or more packets can be in
>>>>
>>> transmission
>>
>>> along each other in parallel.
>>>>
>>>> Also when you enable queueing on Router/switch. Does this only effect
>>>>
>>> the
>>>
>>>> behaviour of how the router treats the packet on the inbound or outbound
>>>> interface or does it also effect the behaviour of the packet when it is
>>>> actually in transit on the wire itself.
>>>>
>>>>
>>>> Blogs and organic groups at http://www.ccie.net
>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> --
>>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
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>>
>>
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>>
>>
>>
>>
>>
>>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
> Blogs and organic groups at http://www.ccie.net
>
> ______________________________**______________________________**
> ___________
> Subscription information may be found at: http://www.groupstudy.com/**
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Received on Sun Jul 31 2011 - 15:53:54 ART