[asterisk-users] DAHDI span timeing source

[Shaun Ruffell]

On Fri, May 27, 2011 at 08:57:15PM +0000, satish patel wrote:
> 
> You mean say 
> 
> 0=Slave (Use PSTN clock)
> 1=Master(generate Internal clock) 
> 
> So best option is 0 for all span if you connected on PSTN right ?

Not really.  Looking in system.conf.sample in dahdi-tools [1]

  Choose 1 to make the equipment at the far end of the E1/T1/BRI link the
  preferred source of the master clock. Choose 2 to make it the second
  choice for the master clock, if the first choice port fails (the far end
  dies, a cable breaks, or whatever). Choose 3 to make a port the third
  choice, and so on. If you have, say, 2 ports connected to the PSTN, mark
  those as 1 and 2. The number used for each port should be different.
  
  If you choose 0, the port will never be used as a source of timing. This
  is appropriate when you know the far end should always be a slave to
  you. If the port is connected to a channel bank, for example, you should
  always be its master. Likewise, BRI TE ports should always be configured
  as a slave.  Any number of ports can be marked as 0.

[1] http://svn.asterisk.org/view/dahdi/tools/trunk/system.conf.sample?view=co

-- 
Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
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