1. Since Sunday 2019-09-08 the lines have been consistently excellent, with downstream SNRM down-spiking completely gone. This really has been the month from hell. A&A worked very very hard but were perhaps overwhelmed. DLM was a disaster.
2. One new development: for the first time in a year, the daily square wave of upstream SNRM on line 3 has disappeared completely. This has improved line 3’s upstream performance and reliability a lot, and it has made the grouping of upstream speeds closer, since line 3 is now no longer hugely slower than the others, just a bit slower.
3. For some unknown reason, despite this, speed tests on upstream throughput give poor results. Since both the closer upstream sync rate grouping and increased upstream sync rate of line 3 contribute towards improved combined performance then this is unexplained and counterintuitive.
Line 1 SNRM Sun-Mon :
Line 2. Don’t yet know what the 1.5 dB u/s downstep is all about. That remains to be seen. It’s a nuisance though.
Line 3. No more green (upstream) daily square wave:
Line 4: