2520s have an S/T interface. The TelTone Demonstrator supports the U
interface. Yes, you need an NT-1 device between the router and the Teltone.
The more expensive Teltone box supports either U or S/T.
> -----Original Message-----
> From: James Robinson [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, November 21, 2000 7:52 PM
> To: [EMAIL PROTECTED]
> Subject: ISDN ?????
>
>
> I have a question concerning by ISDN setup!
>
>
> I have 2 cisco 2520 routers with bri(s) on each. I also am
> using a teltone
> ISDN demonstrator. My task is to network these to routers together
> connecting via ISDN. I have setup all I can thin of and am
> believing that
> my problem is no in the routers or teltone but what is
> supposed to be in the
> middle of the router and simulator. I guess my question
> is....do I need a
> NT1 device between the router and the simulator or does the
> router do this
> for me?
>
> I have looked at some configs and some have a dialer
> interface configured on
> them others do not! (What is up with that?)
>
> When I look at the "show ISDN status" command I get that layer 1 is
> deactivated. I am stuck please help.
>
>
> James Robinson
>
>
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