[Asterisk-Users] RedAlarm (t100p - Adtran Total Access 750)

[Steven Critchfield]

On Thu, 2004-12-23 at 13:53 -0500, Brent Franks wrote:
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of TC
> Sent: Thursday, December 23, 2004 1:29 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] RedAlarm (t100p - Adtran Total Access 750)
> 
> > Why would you say channel banks should sync with asterisk box ?
> > I would advoate that the highest quality timing source should be the souce
> > Of timing, ie which source has the most accurate crystal or what source 
> > has the highest stratum rating ?
> 
> Thanks to everyone who has responded to my e-mail.
> 
> The documentation doesn't really explain it that well.
> 
> This is what I have picked up from the conversation:
> 
> Using these settings, The T100P would get Clock Sync from itself.  It would
> use its own timing.
> 
> span=1,0,0,esf,b8zs
> 
> Using these settings, the Channel Bank will receive clock sync from the
> t100p.
> 
> span=1,1,0,esf,b8zs

When you take a moment to look over your logic above, you will see you
are trying to explain the same thing with both entries.

A timing of zero is to ignore line timing and generate your own. The
channel bank would then use the line timing to sync itself.

A timing of non zero is to pick up timing from the line in lessening
priority as the numbers increase. 

You would want to set a timing of 1 if you are connecting the span to a
PSTN provider or some hardware connected to the PSTN. You would set
other non zero timings for other PSTN touching lines. Only put a zero in
place if you already have timing or if you are sending to a non PSTN
connected device.
-- 
Steven Critchfield <critch at basesys.com>