[asterisk-users] Timing cable usage necessity

[Захаров Антон]

On 26.11.2010 17:29, David Backeberg wrote:
> 2010/11/25 Захаров Антон<instnt at mail.ru>:
>> Hello everyone.
>>
>> I have a timing slips errors and I can't understand what source of the
>> problem is.
>> My installation has 2 digium cards: TE420 and TE220 cards in one server.
>> There are 3 spans (E1) to PSTN and 3 spans to internal PBS stations -
>> normal installation for transit communication.
>> Span configuration is:
>> span=1,1,0,ccs,hdb3 #TE420 - first port. To PSTN.
>> span=2,0,0,ccs,hdb3 #TE420 - second port. To PBX.
>> span=3,2,0,ccs,hdb3 #TE420 - third port. To PSTN.
>> span=4,0,0,ccs,hdb3 #TE420 - fourth port. To PBX.
>> span=5,3,0,ccs,hdb3 #TE220 - first port. To PSTN.
>> span=6,0,0,ccs,hdb3 #TE220 - second port. To PBX.
>> I should to say, that PBXs are interconnected through router (doesn't
>> know anything about it). So all schema looks like this:
>> http://yfrog.com/jjschemaj
>> Spans 1-5 works fine, but on span 6 (marked bold) I have rising timing
>> slips counter.
>>
>> I think it's appearing because I'm getting a primary timing source on
>> span 1 - first port on TE420. But TE220 doesn't use it's span 5 for
>> timing source, because it has priority 3, so it could be a sync problem.
>> Am I wrong?
>>
>> I'm started to think about timing cable for syncing timing on first card
>> and second. Should I use it?
>>
>> It's a problem to bought cable in our city (Russia,Moscow). All
>> resellers sell only cards. Could I use floppy or IDE cable to
>> interconnect cards? As I see in picture of cable, it's a direct 16 pin
>> cable.
>>
>> Does anybody know something about timing cable for different cards? How
>> I can solve my problem?
> I can't answer your problem about how you find one in Moscow, but I
> can tell you that when I've installed two cards in a single server I
> have used the timing ribbon cable. I have no idea whether it made a
> difference, and I now build my servers differently. You could ask
> Digium directly, as they probably know their resellers.
>
> Something that may help you is that you can make sure you set the
> priority on the cards differently from each other. There is a dial
> with a pointer that tells you which card is prioritized. Whenever I
> had two in the same server I made sure that one card was set higher
> than the other.
>
As I think, i forgot to set priority on TE420 and TE220. Could this be 
the cause of an slip error?
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