Re: Packet delivery on a Ethernet Wire

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
>
> "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
>>
>> 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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>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net