deepakjain

Hi,

(Avaya G3r V11)
Can someone tell me what's the difference b/w Stratum level 3 & Stratum level 4

At present we have taken one Ds1 card as clock source.

We are also facing a peculiar problem.

we are getting 10% of total calls as one way communication calls.

Cisco and AT&T have checked at their end and found nothing at their end.

Is there anything related to Avaya or DS1 cards.

please help.

Regards
DJ

martinyoung

Clocks are stratum 1 to stratum 4. A stratum 1 clock is the atomic clock and a stratum 4 clock is the internal clock in the Definity. The clock in the CO that you get your T1s from is usually a stratum 3 clock. Here's how to find out if you are using that clock.

Use the command "disp sync" to find out if the switch is programmed to use a T1 for synchronization. If it is, then do a "status sync" to verify if the switch is using the programmed T1 for clocking. If the result of this test is the sync source is "1A" then you are not using the T1. Disable sync and enable sync to force it back to the T1.

If everything tests ok, contact your local vendor (SBC or whomever does the proverbial last mile) and make sure they do not have any loopbacks in place. Ask them to execute the command to drop all loopbacks. We had a problem here about two months ago where SBC had looped some B channels on some MCI T1s and made them one way transmission.

You can also test it. Do the command "test board 1B06 (or wherever the board is located)". Cancel the command after test 146 because the tests after that do the B channels. The tests up to, and including, test 146 are the span tests. Do they all pass? You might fail test 144, retest again. That is just a counter of how many slips have happened since the last time it was tested. It should pass this time because the last test reset the counter.

If your T1 goes through somebody elses equipment before getting to the Definity, make sure that piece of equipment has its' clock disabled and that it passes the CO clock through.

If your T1 is ISDN there is another thing to look at. On the DS1 page itself in the middle of the right column is a protocol, It will either be an a, b, or c. D is also a choice, but it is rare. This option needs to match the CO. The most common choices are NI1=a and NI2=b. But you could also have 4ess, 5ess, and DMS100. If you are outside the US, there are even more possibilities.

__________________
Marty
Retired Avaya DSIC tech

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