All, We have a DS1 line down, that is the result of a line cut along a DS3 trunk. Apparenty, the cut is either so bad, or so hard to reach, that we are getting an ETR of 2 days+. This is not my problem, however. When asked about rerouting, one of the Telco techs stated that they couldn't reroute right away, becasue the DS3 is not provisioned for B8ZS. To which I replied, "So. I didn't know any DS3 used B8ZS line coding." Anyway, my question is this: Is there a DS3 signalling standard that would call for B8ZS instead of B3ZS? And if so, what difference would it make if the coding were coming in as B8ZS, AMI, 4B/5B, NRZI, etc - it still needs to be demuxed back into the original signal, to terminate in the switch, right? Besides, I would think channelized DS1s riding a DS3 would already have been ones-density ensured, so any ones-density scheme on a channelized DS3 seems moot. If I am wrong, however, let me know so I can explain this to my techs for future reference. Thanks! Chris