Ethernet transmission rate

Started by nguyentranminhnhat July 3, 2009
Dear all,

What is the maximum ethernet transmission rate of LPC2000 family. If I use LPC2478 at 72MHz clock rate and DP83848 100/10M Ethernet PHY, what is the maximum actual ethernet transmission rate?

Hope to hear from you
Thank you

An Engineer's Guide to the LPC2100 Series

Hi,

> What is the maximum ethernet transmission rate of LPC2000 family. If I use
> LPC2478 at 72MHz clock rate and DP83848 100/10M Ethernet PHY, what is the
> maximum actual ethernet transmission rate?

Duh, isn't it obvious? If you have a 100Mbit link, the bits travel at
100Mbits/second. If you have a 10Mbit link, then they travel at
10Mbit/second.

I mean, this is very Elementary Stuff.

My answer is 100% accurate. Your question is nonsense.

--
Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
CrossWorks V2 is out for LPC1700, LPC3100, LPC3200, SAM9, and more!

Hi Paul Curtis,

Your answer is right and they are maximum rate in theory!

I want to clarify my question: we use 2 LPC2478 at 72MHz clock rate and transceive data on 100M ethernet line. Data from No1 to No2 and back and we measure actual transmission rate. So, what is the maximum rate we can get?

One more example, what if we send camera video stream to LPC2478 and then display on GLCD? how about video size, fps ... we can get?

--- In l..., "Paul Curtis" wrote:
>
> Hi,
>
> I mean, this is very Elementary Stuff.
>
> My answer is 100% accurate. Your question is nonsense.
>
> --
> Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
> CrossWorks V2 is out for LPC1700, LPC3100, LPC3200, SAM9, and more!
>

No one can answer this question, because we do not know what the software is and how efficient it does things in between sending and receiving data packets.

Its a bit like having a fast car in a traffic jam and not knowing how good the roads are like and how good the driver is.

Regards

Jean-Jacques

--- In l..., "nguyentranminhnhat" wrote:
>
> Hi Paul Curtis,
>
> Your answer is right and they are maximum rate in theory!
>
> I want to clarify my question: we use 2 LPC2478 at 72MHz clock rate and transceive data on 100M ethernet line. Data from No1 to No2 and back and we measure actual transmission rate. So, what is the maximum rate we can get?
>
> One more example, what if we send camera video stream to LPC2478 and then display on GLCD? how about video size, fps ... we can get?
>
> --- In l..., "Paul Curtis" wrote:
> >
> > Hi,
> >
> > I mean, this is very Elementary Stuff.
> >
> > My answer is 100% accurate. Your question is nonsense.
> >
> > --
> > Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
> > CrossWorks V2 is out for LPC1700, LPC3100, LPC3200, SAM9, and more!
>

--- In l..., "nguyentranminhnhat" wrote:
>
> Hi Paul Curtis,
>
> Your answer is right and they are maximum rate in theory!
>
> I want to clarify my question: we use 2 LPC2478 at 72MHz clock rate

If you already have 2 boards, why not measure the speed yourself ??

You really need to do your own homework.

don
and transceive data on 100M ethernet line. Data from No1 to No2 and back and we measure actual transmission rate. So, what is the maximum rate we can get?
>
> One more example, what if we send camera video stream to LPC2478 and then display on GLCD? how about video size, fps ... we can get?
>
> --- In l..., "Paul Curtis" wrote:
> >
> > Hi,
> >
> > I mean, this is very Elementary Stuff.
> >
> > My answer is 100% accurate. Your question is nonsense.
> >
> > --
> > Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
> > CrossWorks V2 is out for LPC1700, LPC3100, LPC3200, SAM9, and more!
>

This is how that long and useless discussion starts...

Don,

I think you want to know what to expect from ethernet on LPC. We have a
proprietary OS/TCP stack on an LPC2368 and in simple tests here we get about
2M bytes/s. LPC transmitting packets via a task to monitor on PC.
But you need to do tests with your board/OS/stack...

Marcelo Richter
> -----Original Message-----
> From: l... [mailto:l...] On Behalf
Of
> donhamilton2002
> Sent: sexta-feira, 3 de julho de 2009 12:28
> To: l...
> Subject: [lpc2000] Re: Ethernet transmission rate
>
> --- In l..., "nguyentranminhnhat"

> wrote:
> >
> > Hi Paul Curtis,
> >
> > Your answer is right and they are maximum rate in theory!
> >
> > I want to clarify my question: we use 2 LPC2478 at 72MHz clock rate
>
> If you already have 2 boards, why not measure the speed yourself ??
>
> You really need to do your own homework.
>
> don
>
>
> and transceive data on 100M ethernet line. Data from No1 to No2 and back
and we
> measure actual transmission rate. So, what is the maximum rate we can get?
> >
> > One more example, what if we send camera video stream to LPC2478 and
then
> display on GLCD? how about video size, fps ... we can get?
> >
> > --- In l..., "Paul Curtis" wrote:
> > >
> > > Hi,
> > >
> > > I mean, this is very Elementary Stuff.
> > >
> > > My answer is 100% accurate. Your question is nonsense.
> > >
> > > --
> > > Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
> > > CrossWorks V2 is out for LPC1700, LPC3100, LPC3200, SAM9, and more!
> > >
> >
>
>
>
>
>
>
>
This will also depends on the protocol stack you're using. Are you going to send data raw over ethernet? Are you going tu use a tcp/ip stack? A proprietary stack? Anyway, you shold be the one to answer this. Keep in mind that for each stack you add you'll have more overhead (and obvious you datarate will drop). This is a just a theorical limit, as alredy pointed true rates will depends on software inplementation. Don't forget that even if you send data as faster as you can, if you don't have a real time ethernet (or wathever other stack you're using) on the receiving side, you're likely to miss any real time constraints for you system (suposing the system consists in both sides, sender and receiver).

Regards,
Fernando Almeida.

--- Em sex, 3/7/09, Marcelo Richter escreveu:

De: Marcelo Richter
Assunto: RE: [lpc2000] Re: Ethernet transmission rate
Para: l...
Data: Sexta-feira, 3 de Julho de 2009, 14:20





This is how that long and useless discussion starts...

Don,

I think you want to know what to expect from ethernet on LPC. We have a

proprietary OS/TCP stack on an LPC2368 and in simple tests here we get about

2M bytes/s. LPC transmitting packets via a task to monitor on PC.

But you need to do tests with your board/OS/stack. ..

Marcelo Richter

> -----Original Message-----

> From: lpc2000@yahoogroups .com [mailto:lpc2000@yahoogroups .com] On Behalf

Of

> donhamilton2002

> Sent: sexta-feira, 3 de julho de 2009 12:28

> To: lpc2000@yahoogroups .com

> Subject: [lpc2000] Re: Ethernet transmission rate

>

> --- In lpc2000@yahoogroups .com, "nguyentranminhnhat "



> wrote:

> >

> > Hi Paul Curtis,

> >

> > Your answer is right and they are maximum rate in theory!

> >

> > I want to clarify my question: we use 2 LPC2478 at 72MHz clock rate

>

> If you already have 2 boards, why not measure the speed yourself ??

>

> You really need to do your own homework.

>

> don

>

>

> and transceive data on 100M ethernet line. Data from No1 to No2 and back

and we

> measure actual transmission rate. So, what is the maximum rate we can get?

> >

> > One more example, what if we send camera video stream to LPC2478 and

then

> display on GLCD? how about video size, fps ... we can get?

> >

> > --- In lpc2000@yahoogroups .com, "Paul Curtis" wrote:

> > >

> > > Hi,

> > >

> > > I mean, this is very Elementary Stuff.

> > >

> > > My answer is 100% accurate. Your question is nonsense.

> > >

> > > --

> > > Paul Curtis, Rowley Associates Ltd http://www.rowley. co.uk

> > > CrossWorks V2 is out for LPC1700, LPC3100, LPC3200, SAM9, and more!

> > >

> >

>

>

>

>

> ------------ --------- --------- ------

>

>