Dead air after switching loop and Dchannel to dual PRI Card 2

[ttdredd1]

Users say when they talk to a person they will randomly hear dead air for a second or so and then hear the caller again. It's as though they are losing signal for a sec and then comes back? The end caller can hear them fine without any dead air but they seem to get it without any warning, will just heard silence and then will hear the other person.

I have checked and the loop is experiencing some clock slips and we have re-set the counter but even when it's at .002 they still have same issue.

This is on an opt61c.

What could be the problem?

 

[TAnselm]

If the T is experienceing drop offs you should be able to see it in load 60...

Go to LD 60 and type LCNT (list count for errors)

 

[ttdredd1]

I am resetting the Slips using RCNT at least 3 time a day since we moved to the new loop.

PRI TRK LOOP 13
TRSH CNT:
BPV -000
SLIPD -000
SLIPR -095
CRC -000
LOSFA -000
OS_BPV -000
OS_LOSFA-000
OS_YEL -000

 

[EddieDuece]

Whats you clock set to?

 

[johnpoole]

ssck 0, ld 60.. resetting the counter just resets the counter, ever time you slip someone gets dead air.. get yout clocking fixed

john poole
bellsouth business
columbia,sc

 

[ttdredd1]

We have an OPt61 where all of our loops and DCH reside. This loop goes thru a fiber mux to an opt11.

On the opt11 there is no slips. That where the users are receiving the dead air for a few seconds.

On the OPT61 is where I'm getting the slips.

Check the clocking?????

In ld 60
. ssck 0

What does this do?

How would I fix this or know that there is a clocking issue?

 

[EddieDuece]

It's the clocking of your T1's. When you have the issues like dead air and such, you clocking is out of whack. You could be set to free run or secondary, so you want to ensure your clocking to the primary.

 

[ttdredd1]

How do I do that?

Sorry to be a bother.

Thanks!

 

[EddieDuece]

SSCK x <full> Get status of system clock x, where:
• x = 0 or 1
• full = Get full status of clock in side x, including serial number
and loadware versions and states.
The SSCK command indicates the active controller as well as
active primary or secondary reference clock source or free run.

 

[ttdredd1]

We have our clock set to 1

We also have several loops and 4 dch's.

How can I determin if there is a clocking issue with the loop in question?(loop 13)Where the users are getting dead air for a few seconds. The call does not disconnect, just get dead air from the other end. This is when talking to someone internal or externally?

This is my clock info:

ENBL
STANDBY
CLOCK CONTROLLER - LOCKED TO LOOP 2
PREF - 2
SREF - 18
AUTO SWREF CLK - ENBL
NO ERROR
.ssck 2

.
DTI005 2
ssck 1
ENBL
CLOCK ACTIVE
CLOCK CONTROLLER - LOCKED TO LOOP 2
PREF - 2
SREF - 18
AUTO SWREF CLK - ENBL
NO ERROR
.

 

[EddieDuece]

You need to check the clocking on both switches......

 

[ttdredd1]

OOOOOOOOOK, This is the info on the other switch.

I'm assuming that free run is bad?

How do I fix?

.SSCK 0
ENBL
CLOCK ACTIVE
SYSTEM CLOCK - LOCKED TO SLOT 1
PREF - 1
SREF - FREE RUN
AUTO SWREF CLK - ENBL
NO ERROR

 

[EddieDuece]

TRCK aaa n Set clock controller tracking.
Where aaa is:

SCLK = track secondary clock (on remote)

Where n is:
• 0 = Main cabinet clock
• 1, 2, 3, or 4 = IP expansion cabinet or MG 1000S number
Parameters PLL1, PLL3 and PLL4 can be used with n=0 only.
Track primary clock (PCK) or secondary clock (SCLK) as the
reference clock or go to free run (FRUN) mode.
dti/pra-5

 

[ttdredd1]

I'm not sure what I'm doing wrong, but you have directed me in the right direction. Thanks!

Since SREF is secondary, does it matter what this is set to?


.TRCK PCK

.SSCK 0
ENBL
CLOCK ACTIVE
SYSTEM CLOCK - LOCKED TO SLOT 1
PREF - 1
SREF - FREE RUN
AUTO SWREF CLK - ENBL
NO ERROR


PRI* TRK LOOP 1 - ENBL
FFMT/LCMT/YALMT: ESF/B8Z/FDL
TRACKING
SERVICE RESTORE: YES
YEL ALM PROCESS: YES
ALARM STATUS : NO ALARM
CH 01 - UNEQ CH 02 - UNEQ
CH 03 - UNEQ CH 04 - UNEQ
CH 05 - UNEQ CH 06 - UNEQ
CH 07 - UNEQ CH 08 - UNEQ
CH 09 - UNEQ CH 10 - UNEQ
CH 11 - UNEQ CH 12 - UNEQ
CH 13 - UNEQ CH 14 - UNEQ
CH 15 - UNEQ CH 16 - UNEQ
CH 17 - UNEQ CH 18 - UNEQ
CH 19 - IDLE TIE * CH 20 - IDLE TIE *
CH 21 - IDLE TIE * CH 22 - IDLE TIE *
CH 23 - IDLE TIE * CH 24 - DCH 8

 

[EddieDuece]

Yes, it does matter, in the event your primary clocking goes down. I would establish your secondary clocking throughout your network. Always fix your pitfalls when you run across them. Make cleanup efforts less of a headache down the road. You might not be sure about it now, but stick with it, and in a couple of hours, it'll seem easy. Just like playing with a new toy, of course with certain risks!!

 

[jamie2]

If you primary is running clean, the secondary should be able to free run without any slips occurring on your primary.

Have you checked all your cabling or worked with your carrier in testing the circuit?

 

[ttdredd1]

You're right.

It's just fruastrating because I can't get it to change from free run? I want to fix it and I will.

However, will this resolve the dead air problem?

Thanks for helping out.

 

[jamie2]

Verify your framing/coding from your vendor on the circuit.

 

[ttdredd1]

I actually think it's just me.

I don't know what to set it to.

We only have one box over there, vs on opt61, we have a primary and a secondary.

Should I just set it to 1 like the primary?

 

[EddieDuece]

You have a primary and secondary circuit over there? On the opt 11?