Troubleshooting a BPV error

[OpethBWP]

General Info
I have an Op11 connected to a CRS dialer that is giving constant BPV errors which is causing the loop to lock out and thus drop the dialer.
The route contains two loops 3 and 2 with 3 being the primary loop so that most of the traffic hits that loop.
Clocking for this setup is the carrier giving me the same source for both.

What Happens
If I bring the loop up then everything is fine with no BPV's. As soon as I connect the dialer the BPV's start before any calls. As the BPV's mount the loop goes into lockout and the dialer drops or I get an Unable to Establish Agent Audio message.

Steps Taken
In troubleshooting this I have had Shared replace everythign from the Nortel side including the whole cabinet. CRS is in the process of replacing the dialer.

Now that I have rambled here is the interesting part.

I can put a TBird on there say between the dialer and loop 3. The TBird strips the BPV's so loop 3 never goes down but loop 2 will then take the BPV's and go down.

Obvioulsy using a Tbird as a filter for BPV's is not the most effective use of such a device but does anyone have any suggestions or any filters that could have the same impact as the TBird?

 

[pbxn]

Its not hardware related, or typically isn't. Just go line by line between the dialer and PBX config's, there's a mismatch somewhere.

 

[markbellot]

Make sure B8ZS is turned off on the dialer T1.

 

[HarrisD1200]

Best use of the T-Berd would be to monitor for BPV's if you have a portable DSX box to put in line with the circuit. If you don't, then use the T-Berd in place of the dialer. TTC has excellent tech support, look on the web under JDSU. BPV's in general are caused by a setup mismatch as PBXN and Markbellot say, or a physical layer issue. Bad cable, incorrect 8 pin heads, improperly punched connections etc. can cause these errors. BPV's are almost always physically related (once configuration has been checked). Use the T-Berd to terminate in place of the Option, and see if BPV's are registered. If they are, move it closer to the dialer until the BPV's are gone. If they come directly out of the dialer, then that's the problem. If they stop before you get to the dialer, then it's the segment you just tested.

 

[OpethBWP]

Earlier today we replaced the dialer with a newer revision. We also removed the Tberd out of the chain and changed the dialer/pbx to run off the same clock source.

Now I am seeing the following on my error counts

DTI LOOP 3
TRSH CNT:
BPV -002
SLIPD -001
SLIPR -001
LOSFA -009
OS_BPV -000
OS_LOSFA-000
OS_YEL -000

 

[TDMtek]

My two cents worth is one end D4 AMI and one end is B8ZS.

 

[OpethBWP]

Ok so I would check signaling (AMI/B8) in the route configuation right?

Basically look at what it is on my side and match up the dialer?