Subject: Re: Clock synchronization with ISDN
To: Jonathan Stone <jonathan@DSG.Stanford.EDU>
From: Christian Kuhtz <>
List: tech-kern
Date: 02/17/1997 19:34:03
On Mon, 17 Feb 1997 11:53:59 -0800, Jonathan Stone  
<jonathan@DSG.Stanford.EDU> wrote:

> Isn't ISDN signalling *slow*?

What do you mean by "slow"?  Low bandwidth or high latency?  Would you care  
to explain that in a little bit more detail?

> If it's slow, then how much jitter is
> that, and (at best) discretisation at the 9600-baud D channel line speed
> adding?  Not  to mention  switching delays inside the telecom net?

Most of the timestamps present in ISDN are generated by the last switch  
before your end of the BRI or PRI, therefore latency will be reasonably low  
(not more than your ISDN link itself (round-trip times of no more than 2-3ms  
worst case).

Christian Kuhtz <> (work),   <> (personal)
UNIX/Network Specialist,   "A German in the U.S., speaking for himself *gasp*"
Paranet, Inc. Rocky Mountain Branch,  MIME/NeXTmail Ok