> The timestamp is coming over the 16Kbit/s D channel, which is designed to be  
> a very low latency out-of-band signaling channel.
> 
> Why would latency be high on the D channel?  Assuming you're not abusing it  
> for something like a low volume X.25 channel, by definition, there should  
> never be any significant latency.

Since by design the D channel may carry a "low volume" X.25 channel (it's
running effectively as a 9600 baud X.25 line), why would anyone bother to
make the clock particularly accurate, esp. more accurate than can be
guarranteed over this channel?
--
ws@TooLs.DE     (Wolfgang Solfrank, TooLs GmbH) 	+49-228-985800