03-06-2003 07:56 AM - edited 03-02-2019 05:38 AM
I'm in the process of trying to troubleshoot the massive errors I'm receiving on one end of 3 T1s. After verifying line codes, framing and clocking with AT&T, I want to test the line with them. The problem is that they've never been able to see my equipment when they loop me. Is there a loopback command that I need to turn on to allow this? I need to turn it on for a VWIC-2MFT-T1 and WIC1-DSU. Thanks.
03-06-2003 08:36 AM
This link might help!
http://www.cisco.com/warp/public/125/11.html
03-06-2003 09:11 AM
I've read this page but I'm still not completeley clear:
My question is it "loopback local" that needs to be used to allow my service provider to test up to the router. If it is, is the router usable in this mode? I realize intrusive testing brings the line down but once they're done the line comes back up. If the line is in this mode, will this T1 have to wait for me to do a "no loopback local" to bring it up? Thanx.
03-06-2003 09:09 AM
you may want to turn on service-module t1 fdl both on the serial interface . This allows the Lec to loop the card
03-06-2003 11:05 AM
It sounds liek you have a Layer 1 issue. Do you have an extended DEMARC? Can ATT loop the SmartJack? If so, place a HARD loop at the end of your extended DEMARC (buy or make one). Once you have the hard loop at teh far end of the extension, have ATT test the circuit again. If they can see the loop, and your are certain your CSU is good, ask ATT to conduct a "STRESS TEST" for your T1 and request it for at least 60 minutes. Remember this is an intrussive test.
03-06-2003 12:17 PM
Ok, I got AT&T to loop me up and when they did, I saw no errors:
Data in Interval 1:
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
As soon as he let go of the line, the errors came back. I 'm not sure what this means. the other end of the T1 shows no errors either. Just the Calif location:
Data in current interval (755 seconds elapsed):
7287 Line Code Violations, 15185 Path Code Violations
221 Slip Secs, 0 Fr Loss Secs, 221 Line Err Secs, 2 Degraded Mins
143 Errored Secs, 143 Bursty Err Secs, 78 Severely Err Secs, 0 Unavail Secs
03-06-2003 12:55 PM
how far in did the loop go ? If they went to their dmarc, then you may have cable issues between the demarc and your hardware
03-06-2003 10:20 PM
Have you check your framing & clocking ?
Have a look at these links:
http://www.cisco.com/en/US/tech/tk713/tk584/technologies_tech_note09186a00800a5cdc.shtml (Instead of 'e1' use 't1'
http://www.cisco.com/en/US/tech/tk713/tk584/technologies_tech_note09186a00801095a3.shtml
http://www.cisco.com/en/US/tech/tk713/tk584/tk628/tech_protocol_home.html
03-07-2003 08:40 AM
slips & aborts are usually clocking issues , check with the service provider to find out who provides clock, if the provide clock make sure your service module is set to rx clock from the line . If they do not provide clock (this is generally the case in a point to point ) one side of your circuit needs to be set for internal clock and the other side needs to be set for line .
03-07-2003 09:09 AM
Agreed. The Vegas side is set to internal while the Los Angeles is set to line. When AT&T looped me up, there were no errors but when they let it go they came back. Almost seems that I'm not able to clock off of Vegas...
03-07-2003 09:54 AM
try reversing it , have LA provide clock and have Vegas rx
you may also want to try resetting your service module 'clear service-module'
03-12-2003 09:57 AM
I asked AT&T to run tests again. Their quick Monitor test showed the following errors in their log:
Circuit: A-End: NORGCA11
Test Monitor: 60 Seconds
CSU or Access or AT&T IOC problems between Customer and AT&T.
BEFORE: ES=00000 SES=------ BS=------ UAS=00000 LOFC=------
AFTER: ES=-0802 SES=------ BS=------ UAS=00021 LOFC=------
DS1 Test : Problem detected. Requires further analysis.
So then it gets escalated to an actual tech and he finds nothing wrong:
Intrusive testing not authorized...non-intrusively tested
and checked all access points...clean...no errors...the
csu spoke to me - clean...return to customer for closure.
He didn't read the notes to do intrusive testing at night but still he didn't find anything. If he tested to me with no problems doesn't that just clear me and up to where he tested? What about before that point? What about the errors the quick monitoring found? Any suggestions where to go from here would help a lot.
03-12-2003 10:48 AM
Ok
This is what you need to do with ATT
first of all if you have an internal CSU make sure you have the command " service-module FDL T1 both ' This will allow for ATT to loop the CSU.
Next when ATT tests find out where they are testing from , they have a bad habit of testing from the closest test point. If they are testing good from there have them test from the same place in the other direction .
Next If they can looping the smart jack have them loop the CSU.
What is showing when you do a ' sh service-module serial x/xperformance-statistics '
Please paste this in from both ends
03-12-2003 11:03 AM
I have to use the controller t1 commands but assuming you want a "sh controller t1 x/x" . Was there a different command you were looking for. Yes, I do have the FDL both turned on and they were looping me up to the CSU. This is what I got:
Applique type is Channelized T1
Cablelength is short 133
Description: T1 to Las Vegas
Receiver has no alarms.
alarm-trigger is not set
Version info Firmware: 20000922, FPGA: 15
Framing is ESF, FDL is ansi & att, Line Code is B8ZS, Clock Source is Line.
Current port master clock: recovered from controller 3/1
Data in current interval (860 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
Notice, no errors.
I will have them loop as you suggested. Looping both side from the same point. I've contested the ticket with AT&T and waiting for a tech to pick it up. Any gut feeling on this yet? Thanks again, man.
03-12-2003 11:20 AM
What is the sh controllers t1 x/x show on the other end ?
Also You can do a sh controllers t1 x/x this will show you stats over the last 24 hrs
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