Thank you for your response.
I can confirm that the circuit was ordered as AMI/D4. There are 8 other AMI/D4 ckts working properly, terminated to the same piece of equipment but using separate dialogic cards for each T1.
This specific dialogic card defaults to using AMI/D4 and I haven't configured it for anything else. Not sure why the telco is seeing b8zs framing errors.
Telco did an intrusive test to the csu last night and it came up clean. Any ideas?
Thanks.
