atcomsystems.ca/forum Forums VOIP Phones & IP PBX Cisco Telephones and Systems cisco call manager question..

is there a way to set your T1 clocking source in a call manager. I am dealing with an issue where I am seeing timing errors and have proved it is a cpe issue, the trouble is clocking errors. The vendor/CG insist there is no way for him to confirm or set his clock to sync from my network. We run clean to a loop at his CSU, as soon as that loop is down...timing errors.

It is my understanding that is has to be set via the serial port as a command...at least if I am reading this properly.

If this is another T in a multi-T system then it could be taking clock from another carrier that uses a different clock (GPS vs Atomic). We ran into this issue with a few carriers at a call center that had 8 and the solution was to not mix/match the T's.

I know this doesn't answer your direct question but changing the master clock to your T could cause their others to go down. I do now know if the Crisco allows you to have individual clocking of the T1 ports or not.

I know jack squat about Crisco, but I do know you are the clock source so you can't have a timing problem, if you did so would thousands of others. Why these idiots can't figure that out is a mystery to me. Setting his clock source is not your problem, but I know you're trying to help him out. Dang CG's :bang: :bang:

Bill it amazes me every time, this one was extra special he is insisting he has no way to set his clocking source!! James it is just one PRI...and If I changed my clocking I would be rapidly escorted from the building..lol Stratum one clock controls well everything

Well if it's a single PRI and nothing else then I have no clue why it's got clocking issues.

And I have ran into difference in clocking between providers. One carrier took their timing sync from GPS satellites and another carrier took their timing from an atomic clock. What happened is a solar flair came along and threw the GPS clocks off enough to cause timing to slip. Took weeks to figure that out. Basically the two switch tech's were on a phone conference and one goes "It's almost like there is a clock slip". The other goes "Well we take our clock from GPS". The first one went silent for a few seconds then went "You do what?". Problem solved.

lol..James the problem is he is most likely using the equipments internal clock instead of clocking from the network. We run into this rather often, my problem this time is this guy has no clue what he is talking about.

Yep everything is timed off that giant clock in the sky. If they didn't nothing would work.

Looks to me like your customer is going to have to call Crisco. There has to be a way to set timing. Even if it were Crisco to Crisco one would have to be master and the other slave.

oh Bill he called cisco...they first told him there was no way...Thanks to the powers of Google I was able to prove that wrong...If anything Cisco has all there info on the website for the world to see. Anyway after finding the info on the website we advised him to call Cisco and ask for tier 2. Te more and more I work with call managers the less I like dealing with them. I am not anti Voip, but God do I hate dealing with Cisco support

The new tech support. A script pops up on my computer screen and if it's not in the script it doesn't exist. This is the vast majority of support not just cisco.

So were you able to find the clock option for them? I can tell you from experience no matter how much you help people on their CPE troubles, you're still the big bad phone guy.

Bill we pointed them in the right direction and have not heard back so I am hoping they figured it out

Anthony
You have probably resolved this issue, but I installed an iwatsu system with a T1 to a Cisco. I assumed the Cisco would not provide clock sync so I set the Iwatsu T1 to generate 'master clocking'. Worked like a champ. The PBX configuration was set to Tie Line operation. Private Tie Line configurations often provide for a local clock source.
The point is - it's a lot easier to set the connected PBX as the clock source, not the Cisco. I like Cisco gear, but they made a phone system that requires a degree in astro physics. Its easier to become a Navy Seal than understand the call manager...

VCE in this case I am the CO, providing a T1 from my 5ess..so they always need to clock from me ). Thanks for the tip though. My problem is not so much with Cisco as it is the arrogance of a lot (NOT ALL) but a lot of IT managers installing these systems. I take pleasure in proving them wrong.

I know you can set master/slave clocking when using QSIG PRI.

I have seen it done, I linked a Samsung to Cisco via PRI QSIG, and on the web interface for CM there was an option for master/slave clocking on the PRI, along with coding method (in our case HDB3 and CRC4).

Can't remember where it was as I am the samsung tech not the cisco one, but i was looking over the shoulder of the cisco guy

Its not easy to get a job with Cisco but you cant blame the Cisco brand because every Partner or independent Cisco guy isnt an expert. I know I have received plenty of calls to work on Norstar and Avaya because the last service company sent a tech that was lacking in knowledge and ability. Was Avaya or Nortel to blame for that?
I know the biz owners here have all experienced gaining a customer because the last tech was no where near your level and the cust recognized it right away. Many become long time cust because of it.

Just my 2 cents.

Here is an example being LINE PRIMARY as deriving clock from the telco.

controller T1 0
framing esf
clock source line primary
linecode b8zs
pri-group timeslots 1-24

No doubt there are a lot of people in high paying positions that dont know much but they have higher ups convinced they do.

I see it all the time.

They call me for help and I make half what they do.

Im not jealous.
They have just positioned themselves better than I have and I have no problem with it.

Some are really good at what they do and worth every dime they make.

Even the fakers have to feed their children.

Its nothing to worry about. The guy may know a lot about something else and T1 may not be one of his areas of expertise.

Ive been a phone guy for 25 years and just this year have learned to debug ISDN at L2 and L3.

We all have our strong areas.

Mine are fishing and Grillin.

"No doubt there are a lot of people in high paying positions that don't know much but they have higher ups convinced they do."
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Example of "The Peter Principal". (An individual promoted to their level of incompetence, at which point they advance no more AND keep everyone else from advancing until they are somehow pushed aside.)

On the VWIC card you will have an option to select clock source.
T1 0/3/0 is up.
Applique type is Channelized T1
Cablelength is long 0db
Description: *** Whatever LEC you use # XXXXXXX***
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Version info Firmware: 20071011, FPGA: 13, spm_count = 0
Framing is ESF, Line Code is B8ZS, Clock Source is Internal.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (41 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 3 15 minute intervals):
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Your choices will be running, line or internal.