(ASCEND) Re: Clocking question

[Peter Lalor <plalor@infoasis.com>]

>From: Bob K [mailto:melange@yip.org]
>- - How does a MAX handle the transmission timing on multiple T1's, assuming
>that all of them are set to Clock Source=Yes?  Does it keep the timing of
>the T1's independent of each other, or does it use the 1st T1 that has
>Clock Source=Yes to synchronize *all* T1's in the box?  The former would
>make more sense, but the latter would explain why one T1 having clocking
>issues screwed up all 4.  (Yes, I know it's a bad idea to put 4 T1's in a
>4000, but it wasn't my decision, and there's only 3 in there now :)
>Neither the reference manual nor the ISP configuration guide are very
>clear on this...
>>
>>From: "Treier, Gary R." <gary.treier@unisys.com>
>>I believe that when you have more then one PRI in a MAX that Ascend
>>recommands that you have Clock Source=Yes set on one of them and Clock
>>Source=No set on the rest.

You need to take timing off a PRI, then have the telco have the rest of the
circuits take timing off you ("loop-timing"). You may be able to get away
with not doing this if all your circuits are from a single telco, but when
you start terminating circuits from multiple vendors in a single chassis it
becomes critical.

If that PRI goes down the Max will use it's own closk for the duration. The
TNT can set preference among clock sources.

Search the archives on "frame slip" and "timing" for the complete skinny.

Peter Lalor           Infoasis
plalor@infoasis.com   http://www.infoasis.com/
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