[Asterisk-Users] ISDN master clock issue ?

[Rich Adamson]

Tristan wrote:
> Hi,
> 
> Just a little question about digium/sangoma difference of behaviour...
> 
> I need to setup 3 E1 connections to 3 different ISDN clock provider ...
> Can the TE411P handle this per span or do I have to buy a Sangoma one ?

The digium card has a single on-board clock and you choose which of the 
three PRI's you want to sync to.  The Sangoma card has an on-board clock 
for each PRI, therefore you can sync each clock to its respective PRI.

However, there is seldom a need to truly sync to all three at the same 
time.  In very general terms, all PRI providers sync their equipment to 
a higher level clock (their upstream provider), negating the need for 
you to sync to each. Is there some specific implementation that you're 
thinking of that "requires" each E1 port to sync to their respective 
provider?