I suppose we were making it more difficult than it needed to be. If you
were simply asking if it exists, then the answer is yes. It's called a
router. <g> There is no simple interface converter alone that can
handle all the issues. Something with more intelligence is necessary.
>>> "Neil Schneider" <[EMAIL PROTECTED]> 3/22/01 9:48:07
AM >>>
I agree with you about the issues. I wasn't ever asking a question
about
how the technologies worked, just whether anyone had heard or seen of
such a
device. Again, I am not saying it would make sense, just whether it
exists.
Neil
-----Original Message-----
From: John Neiberger
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Sent: 3/22/01 11:28 AM
Subject: Re: RJ45 ethernet to cisco Serial conversion?
There are two separate issues that need to be dealt with to accomplish
your goal. First you need to deal with the physical issue, which in a
way is what that bridging device does for you. It allows you to place
ethernet data onto a WAN link, but it also requires the same device to
be on the other end of the link to convert this serialized-ethernet to
standard ethernet. This is just bridging, not true media conversion.
There are yet other physical issues like clocking and encoding. A
synchronous serial link places bits on the wire in a way that would be
completely incomprehensible to an ethernet speaker and vice versa. To
handle the clocking issue you certainly would need a device that can
provide clocking for the serial port, which that bridging unit does.
The second issue is the datalink encapsulation. In ethernet, you're
using Ethernet v2 or 802.3 frames as your encapsulation, whereas the
serial link is using either HDLC, PPP, or frame relay. Again, these
are
so much different than ethernet that it requires some intelligence to
convert between them.
This is why a router is necessary and no simple converter can handle
it. A two-port router would be needed to successfully accomplish this
task. I think that is why Priscilla pointed you to that link.
Instead
of answering the question outright, she pointed you to material
that--upon digestion--would lead to the answer.
HTH,
John
>>> "Neil Schneider" <[EMAIL PROTECTED]> 3/22/01 9:06:57
AM >>>
Priscilla,
I usually look forward to your posts, but I think you are way off
base
with
this response. Pointing to the cisco page describing different
technologies
does absolutely nothing to answer my original question. I also relize
that
a converter/transiever such as this would have limited use in a real
world
situation, but that certainly does not mean it doesnt exist.
Obvoiusly we can move data between ethernet and serial, that is what
is
being done in the router itself, so your train/bus senario is
meaningless.
What I was looking for was an external device that can do this without
resorting to using another router such as -->>
ethernet -->routerA rj45 ----routerA serial --->routerB serial
----routerB
rj45--->ethernet
I want to do:
ehternet ---> external converter ---->routerA serial---routerA
rj45 --->ethernet
Neil Schneider
Priscilla Oppenheimer <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> The question doesn't even make sense. It would be like asking "what
could
I
> use to convert a train station to a bus station?"
>
> Read the document.
>
> http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/index.htm
>
> Priscilla
>
> At 10:19 AM 3/22/01, you wrote:
> >whoever comes up with the converter will be rich...
> >
> >-----Original Message-----
> >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf
Of
> >Priscilla Oppenheimer
> >Sent: Thursday, March 22, 2001 9:29 AM
> >To: [EMAIL PROTECTED]
> >Subject: RE: RJ45 ethernet to cisco Serial conversion?
> >
> >
> >At 12:27 AM 3/22/01, Lim Jit Cheng wrote:
> > >it's not all gone...... there is such converter....
> > >
> > >http://www.lanode.com/tier2/et10.htm
> >
> >That's not a converter. It's a bridge.
> >
> >Here's a good document to help you and the person who asked the
original
> >question:
> >
> >http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/index.htm
> >
> >Priscilla
> >
> >
> >
> >
> > >i wonder how much is the price.. i am interested too.....
> > >
> > >
> > >-----Original Message-----
> > >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
Behalf Of
> > >John Neiberger
> > >Sent: Wednesday, March 21, 2001 11:51 PM
> > >To: [EMAIL PROTECTED]
> > >Cc: [EMAIL PROTECTED]
> > >Subject: Re: RJ45 ethernet to cisco Serial conversion?
> > >
> > >
> > >There is no way to connect an ethernet interface to a serial
interface,
> > >they are entirely different technologies. Your only option would
be to
> > >add another router to do the media conversion.
> > >
> > >Or, you could buy a hub/switch and use that to connect the dsl
router,
> > >the lan, and your 2501. However, that's not the greatest
solution
and
> > >it doesn't really accomplish your goal.
> > >
> > >HTH,
> > >John
> > >
> > > >>> "Neil Schneider" <[EMAIL PROTECTED]> 3/21/01
8:28:06
> > >AM >>>
> > >I want to be able to plug my DSL modem into the serial port on my
> > >2501,
> > >leaving the ethernet port available for my lan. Does anyone know
of a
> > >converter/transiever that will allow me to do this?
> > >Thanks in advance.
> > >
> > >Neil
> > >
> > >
> > >_________________________________
> > >FAQ, list archives, and subscription info:
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> > >
> > >
> > >_________________________________
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[EMAIL PROTECTED]
> >
> >
> >________________________
> >
> >Priscilla Oppenheimer
> >http://www.priscilla.com
> >
> >_________________________________
> >FAQ, list archives, and subscription info:
> >http://www.groupstudy.com/list/cisco.html
> >Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
>
>
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
>
> _________________________________
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