[VoiceOps] Adtran TA900 timing problems

[Matt Yaklin]

I have also not been seeing such a problem with an almost identical
setup.

I am using a 7206VXR with PA-MC-2T3+. Two port DS3 card, clear or
channelized running c7200-js-mz.123-3a.bin. The DS3 is using internal
timing. It is channelized.

My DS3 goes from the router to an Adtran M13 mux (MX2820 with a M13 card).
That Adtran M13 mux card gets it's timing from the loop.

As an example of a flawlessly working Adtran hanging off the DS3 is a:

Total Access 916 (1st Gen)
A2.04.00.E

We also use the FXS ports on this box.

On the TA916:
The primary clock source is t1 0/1.
The secondary clock source is t1 0/2 (we do not have a 2nd t1 installed).
We do not set the internal at all.

This T1 is carried over our SONET network, other M13 muxes, etc.. which
pretty much all have BITS clocks connected to them for proper network
timing. From the Central Office to the customer premise would either
be a T1 or copper pairs build a T1 (TA3000) leased from Fairpoint.

Only the Cisco to the M13 mux card has an odd timing setup with no
true BITS clock going into them.

How much of the network do you control? I am going to guess you lease
a channelized DS3(s) from an ILEC and then they terminate the leased T1s
into THEIR m13 mux at the central office which come back to you over the
DS3?

Is the cisco router DS3 using internal or line timing?

Do you have a totally different Cisco 7206 with Adtran 9xx devices hanging
off of it then "just work"? You mention other Cisco routers so I am just
wondering if a 9xx is working on them...

Just rambling here... throwing out what I do. It might set off a light
bulb that leads to the fix.

matt


On Mon, 4 Nov 2013, My List Account wrote:

> 
> Has anyone ever seen this problem?  I have a good number of TA900s and TA900Es on the other side of a 7206VXR with PA-MC-T3 cards.   Once every few months SIP accounts in the TA900s that are attached to FXS ports have trouble passing
> audio.  It sounds like the audio stream is On/Off about every 3 seconds.   The only ?fix? is to change the timing from the T1 to internal or reboot the router which effectively does the same thing.
> 
>  
> 
> It never has an effect on PRI/T1 voice, Hosted PBX behind that router, or data traffic behind the router.  We never see a problem with other Cisco routers connected to the same DS3(s) including voice on Cisco 2431-8FXS and 16FXS
> rotuers.   When the problem happens it will happen to every TA900 or TA900E at the same time on the same DS3.   It?s always a single random DS3 in the same box.
> 
>  
> 
> I?ve had countless tickets open with our DS3/T1 Provider over the years and they always say they see nothing.  Adtran?s only solution so far is to change the timing when it happens.   One tech suggested we just run internal timing
> all the time but that seems to only work for 31 days.  I?ve completely swapped out the 7200 and the PA-MC-T3 cards.   I?ve had a JDSU test set on random DS3s for weeks at a time and never seen a problem.
> 
>  
> 
> We set up the routers so that the T1 is the Primary and the Internal is secondary.  I suspect that something happens to the primary clock and it fails to the internal clock.   When the primary clock becomes available again the TA900
> does not revert back to the T1 clock.  So when we get to around 31 days the internal timing fails and then the problem with the audio happens. 
> 
>  
> 
>  
> 
>  
> 
> -Richey
> 
> 
>