Re: Bottlenecks and link upgrades

2020-08-12 Thread m.Taichi
Just my curiosity. May I ask how we can measure the link capacity loading? What does it mean by a 50%, 70%, or 90% capacity loading? Load sampled and measured instantaneously, or averaging over a certain period of time (granularity)? These are questions have bothered me for long. Don't know if I c

Re: PTP/Syncronized Ethernet maturity

2020-09-07 Thread m.Taichi via NANOG
Hi Macho, How are you? Glad to hear this from you. We also have PTP deployed in our transport network as one of the synchronization methods for our mobile networks. And we have encountered a lot of problems as well, such as instabilities, path asymmetry, large TIE variation, poor clock recovery p

Re: PTP/Syncronized Ethernet maturity

2020-09-08 Thread m.Taichi via NANOG
Hi Geir, Can we say, from your production network experiences across Asia and Europe, that getting synchronization clock signal via GNSS receiver directly on each cell site is a much more reliable, stable, and simpler way than getting it by network-based PTP? Especially when there is WDM link used

Re: PTP/Syncronized Ethernet maturity

2020-09-09 Thread m.Taichi via NANOG
ween > GNSS-input and the received PTP clock. > > So key message is that PTP does not work out of the box, it requires > significant engineering effort. GNSS has many issues as well, and in > certain parts of Europe we cannot rely on GNSS only. So it is not an > either-or, - we need