I believe the two serial interfaces on a 2501 are synchronous only.
> Couldn't you configure the serial interface to be a async interface by
using
> the command...
>
> physical-layer async
>
> Then you would be able to do it??? I am not sure though I have never
used a
> serial for ISDN.
>
> -chris
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> lee
> Sent: Friday, May 26, 2000 12:40 PM
> To: [EMAIL PROTECTED]
> Subject: Re: 2501 and ISDN
>
>
> Provided you ISDN TA is a sync TA, bcoz the serial port of 2501 is a sync
> serial port.
>
> rgs,
> lee
>
>
> "John Neiberger" <[EMAIL PROTECTED]> wrote in message
> 28127067.959358464405.JavaMail.imail@tiptoe">news:28127067.959358464405.JavaMail.imail@tiptoe...
> > I've been handed a 3COM ISDN terminal adapter and have been told that
we
> are
> > planning to use ISDN as dial backup for a T-1 connecting to a 2501.
One
> > serial port and the ethernet port are being used. The aux port won't
> > provide the needed bandwidth. So that leaves me with the second serial
> > port.
> >
> > Is it possible to use a serial port on a 2501 in conjunction with a TA
> for
> > ISDN DDR? I've been searching cisco's site and haven't found any
mention
> of
> > how to accomplish this. My suggestion at this point is to buy a 2520
and
> > use the BRI interface instead.
> >
> > Any suggestions on how to make this work?
> >
> > Thanks, as always!
> >
> > John Neiberger
> >
> >
> >
> >
> >
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