RE: Packet delivery on a Ethernet Wire

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.
> >
> >
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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
>
> _______________________________________________________________________
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Received on Sun Jul 31 2011 - 16:36:24 ART