Clear Channel on a T1

Christopher A. Woodfield wrote:

<Bell Atlantic Tech> "If it's a T1, then it's B8ZS"
<Me> "Then why can't I send all zeroes, but every other pattern works?"
<Bell> "Hmm... lemme check...(pause)...try now"
<Me> "Ok, it's working. Did you find an AMI segment?"
<Bell> "I didn't change anything."

Ticket closed, "No problem found".

Or, in my former department, officially listed resolution as "CCBM" -
Came Clear By Magic. Amazing what magic tricks folks can do when you
can't see their hands...