Hello
the facts:
- about 50% of the adsl network went down, the rest was online without
problems since weeks
- layer1 link was down (from CPE side)
If we have a short look on the Protocol Stack for BBCS ( Swinog #3 Page 14 [1] ) only the DSLAM could have this type of error. Because it is a link failure between the CPE and the DSLAM.
The next tool which could have an impact on all DSLAM's in about 2 hours ( not every layer1 was down on the same time) is either the monitoring tool or the configuration deployment tool.
As a side note: We still do not have access to the DSLAM Monitoring Tool which is a requirement to make firstlevel support !
At the moment we still have customers complaining.
Theorie1: Someone wrote a "new" deployment script for the new BBCS release which includes ***classified ***.
Unfortunatly all DSLAM's were affected by this change.
Any comments ?
Regards Erich
[1] http://www.swinog.ch/meetings/swinog3/BBCS_Swinog.ppt