[Asterisk-Users] timing/clock problem

[Alex G Robertson]

Kevin P. Fleming wrote:
> Andrew Kohlsmith wrote:
> 
>> Wow you're the first person I've seen using a combination of T1 and E1 
>> on the same card.  I wonder if this has something to do with it (i.e. 
>> a bug in the drivers).
> 
> 
> Based on my understanding of these cards, I don't think it's possible 
> for this to work.
> 
> The framer chip on the board will sync itself to the incoming streams 
> and recover the data, so that _might_ work. What will _not_ work 
> properly is the outgoing streams; all the streams leaving the card are 
> clocked using the same clock (either the on-board clock, or the 
> currently selected "span" clock).
> 
> When you set a span to clock source "1" in zaptel.conf, that makes it 
> the preferred transmission clock source for the _entire card_. If that 
> span is down, the span marked "2" becomes the source for the card. If 
> none of the spans with non-zero preferences are up, the card uses its 
> internal source to clock the transmissions.

Ok. I got that. But when I put another PRI from another telco (I use it for Dial 
clients) it "syncronizes". The clock differnce appear, but this Telco doesn't 
send me any alarms.

I am in contact to Digium support and they did not say any thing about using E1 
and T1 in the same card.

I can't understand why the clock synchronize when clock on span 4 is set to 0 
and when it is set to 1, I get that 443 bps difference in the clocks.

The channel bank at the E1s work just fine at both conditions.

[]s
-- 
Alex G Robertson
NOC - Microlink