So, do ISDN calls between exchanges use AMI, hence their suggestion to use
56k for inter-exchange calls?

>  This has to do w/line coding on channelized T1s and the overhead to keep
>  track of channelized info. If the other end isn't using Clear 64, and is
>  using AMI(a line encoding scheme from telco)then 8 Kbps is used to
>  synchronize between the two ends.
>  
>  Chris
>  
>  -----Original Message-----
>  From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>  John Neiberger
>  Sent: Wednesday, July 05, 2000 4:14 PM
>  To: [EMAIL PROTECTED]
>  Subject: 56k ISDN??
>  
>  
>  I noticed on CCO that when configuring ISDN it suggests settings the
speed
>  to 56k for calls outside of the local exchange.  What types of situations
>  are they actually referring to, and why would we use 56k instead of 64k?
>  
>  Another dumb question:  how do we know if a called number is in our local
>  exchange or not?  Would this be something I'd have to verify with my
local
>  provider?
>  
>  TIA for any help, I'm pretty new to the wonderful world of ISDN.
>  
>  John
>  
>  
>  
>  
>  
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