My last e-mail was one of those mouth engaged before brain e-mails. I'm
travelling at the moment, but hopefully will be able to post this before too
many people shoot me down in flames.
If you're using X21, then at the physical layer there will be no DCD, CTS
etc. I had gone off on a tangent. Forgive me there was a lot more RS232
around when I last used MUX's.
As far as I am aware the only handshaking for X21 will be Control and
Indicate. If the MUX is not providing the correct signalling for this, the
answer may be to loop control to indicate (back towards the router - May
mean you have to make an additional female to male cable unless there is
already an additional patch).
Obviously you should have to do this for both routers.
I am struggling to remember the pin-outs, but what you need to do is wire:
Control A - Indicate A
Control B - Indicate B
Remember I'm talking about a loop back to the router just to fool it into
thinking it's seeing the other end, not any type of cross.
For some reason the following sticks in my mind, but I would definitely do a
search for X21 pin-outs before making a cable:
3 - 5
10 - 12
An X21 breakout box would make things easier if you can get hold of one. If
you can get the MUX's to pass Control and Indicate it would be even better.
Anybody else - Feel free to chip in. I know the above works, but I would be
interested if anybody knows whether there could be side effects (loss of
hardware flow control cause any problems?)
Regards,
Gaz
""Shoaib Waqar"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Well, certainly i m aware of the fact that both DCD
> and CTS are originated by DCE, but the thing is that
> how to get CTS if its not provided by MUX, can anyone
> tell that how to make it on MUX, anyone have clue??
> Plus the MUXes link is Microwave link of 64K and a/c
> to the MUX expert, the MUXes are communicating well.
>
> Shoaib
>
> --- Gareth Hinton
> wrote:
> > Long time since I've messed with the Mux's, but
> > thought I'd have a go as
> > replies seem to be a little scarce.
> > At the very worst you can console yourself with the
> > fact that you're not the
> > only one who hasn't got a clue.
> >
> > Not sure whether you were aware that both CTS and
> > DCD are both originated by
> > the DCE, and depending on the flow control set up,
> > are reliant on the
> > distand end MUX. Do you have a good circuit to the
> > distant mux?
> > Or, do you have a X21 breakout box so you can force
> > DCD and CTS to see if
> > this brings the circuit up.
> > Failing that you could connect DTR to DCD and CTS at
> > the router to see if
> > that brings it up.
> >
> > So in answer to your question, CTS being low,
> > probably isn't the reason for
> > DCD being low. It is more likely that there is a
> > problem with the MUX config
> > or the link which is causing both to be low.
> >
> > Regrds,
> >
> > Gareth
> >
> > ""Shoaib Waqar"" wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > Dear All,
> > >
> > > I am currently experiencing a issue regarding
> > > connectivity of Cisco Router 2511 with Multiplexer
> > > (MUX) which is acting as a DCE device. The MUX is
> > > providing clock, as it is shown at router's
> > console by
> > > entering 'show controller ser 0' but the DCD never
> > > comes up. I have checked the pin configuration by
> > > surfing on Cisco cable specification doc of X21
> > DTE
> > > cable(DB15 connector) and found that the cable is
> > not
> > > getting CTS from MUX, so am i rite in guessing
> > that
> > > this might be the main cause of DCD not coming
> > up??
> > > can anyone plz help ?? i will highly appreciate it
> > >
> > > Shoaib Waqar
> > > CCNP,MCSE,CIPT
> > >
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