New upstream record: 10.8 / 1.63 after power cut
Power cut for a few minutes caused chaos here on Saturday morning as it destroyed one of my UPSs. The router and modems lost power and did not come back on. I panicked as at the time I was in pain and trying to summon help by using my iPad to call my wife. The wireless LAN was up, as it was on a different UPS which remained up through the outage. However even though there was no router, hence no default gateway, my iPad preferred the wireless lan over 4G which it could have chosen and which was a workable route to the internet. iOS was so stupid - it knew there was no default gateway, it told me so in fact, so what was the point of ignoring 4G which was available at the time? To make things worse, when I could not get my iPad to work properly, I had seen an error message about no internet connectivity, in my befuddled pain-ridden state I blamed the iPad, thinking it was an iOS bug, and so restarted the o/s. This now meant that when the iPad came back up it had no real IP addresses because it relied for address allocation on DHCP for IPv4 and router advertisement/solicitation for IPv6 and the router was down. So iOS knew that the WLAN was unusable. Eventually I gathered my wits, realised there was no router and it was not a bug with the iPad, and remembered that due to iOS’s stupidity I had to disable the Wi-Fi NIC to force iOS to prefer 4G; this then restored internet connectivity and I was finally able to summon Janet for some pain relief.
I can only assume that there was a power surge at the time of the power outage, seeing as my UPS decided to die right at that moment. I suddenly realise that that was supposed to be impossible, as there are surge protectors with MOVs further upstream, so these either just failed in their duty, or had already failed but not failed-safe and no one noticed, perhaps due to that recent lightning strike. Anyway, I must check them all somehow. Should probably just replace surge protectors regardless.
When power was restored by Janet removing the duff UPS and moving mains plugs around, I saw the miraculously high levels of performance that have been seen in the past due to an exceptionally quiet local electrical environment, where neighbours’ kit was still off after the end of the outage, having in many cases not automatically come back in again.
I would think crosstalk was exceptionally low too, for this same reason, although I’m not entirely sure why modems would not come back on after having experienced a power loss. Is that correct? If so, why?
This is what I saw; sync rates:
#1: down 3088 kbps, up 505 kbps
#2: down 3012 kbps, up 557 kbps
#3: down 3261 kbps, up 416 kbps
#4: down 3162 kbps, up 557 kbps
1. Highest ever total measured upstream tcp payload speed tester rate with speedtester2.aa.net.uk at 1.63 Mbps upstream; beats previous records of 1.56, 1.58, 1.61 Mbps; would be at least 90k better if line 3 upstream were not acting up
2. Highest ever downstream sync rate seen on any line: now on line 3 at 3.261 Mbps sync
3. One of the possible highest ever downstream tcp payload speed tester rate figures with speedtester2.aa.net.uk at 10.8 Mbps downstream
This record upstream means that the upstream performance problem that I have been moaning about off and on has now mysteriously gone away, and then some. This is 1.63 Mbps TCP payload to be compared with 1.25-1.35 some few weeks ago, so what between 21 and 32% depending on how you look at it.
This just reminds me that when I am a bit less broke it is definitely time for a new UPS. Have discussed this in an earlier thread several times but have never actually done anything. I would be grateful for some purchasing tips to get a bargain
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Topic: Power cut, iOS, UPS damage and low-crosstalk honeymoon record performance (Read 1085 times)