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Observing Result |
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Dome & Scope Slewing Performance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Slew/Centering Performance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Guiding Performance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Sky Conditions (Locate Frames) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Night Sky Summary Plot Top axis: Sky Brightness at Zenith (in ADU/s) Lefthand axis: Local Time (hh LT). Righthand axis: Sun Altitude (degs) |
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Actual Weather vs Pre-Session Weather Forecast |
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Session Event Log | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Issue. Loss of Ethernet Connection
to/from Observatory before, during and after session S1074 (2022-12-20 &
2022-12-21)
1) Unable to make VNC Connection from or open Windows
Explorer Views from
Development Computer to either Observatory Computer or the AllSky/Weather
Computer (pre-session, 2022-12-20 16:00)
2) Observatory and AllSky/Weather Computers stopped updating website less
than 2 hours into Session (20:15).
3) Observatory remains non-operational due to the
Observatory's Ethernet Connection being down or unreliable (2022-12-21)
Background
Connection to the household LAN and to
the Internet is normally provided by 'Ethernet over Powerline', and is
generally very reliable in comparison with WIFI connectivity to the
Observatory which is normally unreliable and very slow/problematic.
LAN in critical to Observatory Operations to allow i) TCP/ IP Communication
between Observatory Computer and AllSky/Weather Computer ii) VNC Connections
for Remote Monitoring of Observatory Operations, iii) File transfer
to/from Observatory (software updates, targets database handover, session
results), whilst Intenet access is critical for iv) Uploading of
files and data to Observatory's WebSite for Remote Monitoring, and v)
Download of weather forecast data including minutely rain radar based
precipitation forecast.
Description
1) Before the S1074 session at around 16:00 the VNC connection
from the Development (House) Computer to the Observatory Computer went down and couldn't be
readily restored. Also unable to
connect to AllSky/Weather Computer or successfully ping either computer.
Tried power-resetting Ethernet over Power Plugs at both router end and
observatory end, but unable to restore connection. Observatory
Computer able to see files on the
AllSky/Weather Computer.
- Some question over whether the Development Computer
was able to see the Internet ok.
-
Unclear if files from Observatory are being uploaded to website or not (they
are borderline overdue)
(last VWS picture 15:35, Last Obs
Status 15:43, last 60 min rain, 15:44 (later 17:10 but through weak
WIFI link).
- Rebooting Development Computer, rebooting
Observatory Computer and rebooting Router didn't resolve the issue.
-
Power resetting Ethernet over power plugs (both ends) and power-resetting
Observatory Ethernet Switch didn't resolve the issue.
- By passing
the Ethernet Switch didn't resolve issue.
- Ethernet over Power
confirmed to be working in the house.
- Ethernet over power
plug taken from Observatory confirmed to work when located inside the house.
- Employing a different (working) Ethernet over Power plug in the
observatory didn't resolve the issue.
- WIFI connection to Router
working ok (one user querying about the quality of WIFI connection ?).
- The Observatory and AllSky Computers remained in communication to each
other up until 04:30 which is presumed to be the point where the Ethernet
Hub in the Observatory was reset in a vain attempt to restore connectivity
with the house.
- Ethernet connectivity restored by itself at
around around 18:10 or so. Thinking that the problems were fully resolved a
live Observatory Session was kicked off at 18:28 using AuoStart.
2) Observatory and AllSky/Weather Computers stopped updating website less
than 2 hours into Session (20:15). At the same time there was a return
of the pre-session problem whereby both the Development Computer and IPad
couldn't make a VNC connection to either of the computers in the
observatory. As weather was fine and forecast to be remain so
until the follwoing day, the Observatory was allowed to operate under total
automonous control. Observatory was checked in the morning and everything
was closed and parked up as expected. Checking the Computer showed that the
session had run successfully and data had collected the whole night.
Whilst the session was succcessful it is a nevertheless a major issue
that the status of the session and any alerts weren't available for the
majority of the session. Connectivity problem prevented the download
of data from the session until two days later (2022-12-22) when a temporary
powerline was put out to the observatory and the Observatory's Ethernet over
PowerLine plug attached to it.
Analysis and Remediation
2022-12-21
Attempts were made
on 2022-12-21 to use WIFI connection to return some operational capability
back or at least to help diagnostics, but the WIFI connection was not
reliable enough or fast enough to permit any more than occasional use. This
was consistent with past experience and it why Ethernet over Powerline was
adopted for the Observatory Connectivity,
Since it had been pretty
much confirmed that Router and Ethernet over Powerline were working ok
within the house, that Ethernet Over Powerline pugs and Ethernet
Cables were working ok, and the Computer involved were all working ok it was
beginning to look like that there was an issue with the Main Powerline
between house and Observatory or with the electrics in the Observatory.
2022-12-22 am
A
temporary power cable was laid out between the house and the observatory the
following day (2022-12-22). The plug end was connected to a plug
socket in house/garage that is directly adjacent to the socket used for the
main powerline to the Observatory), whilst the EtherNet over PowerLine plug
was connected to the socket end located in the Observatory. Turning on
power, and checking the Observatory Computer it was confirmed that Ethernet
over Powerline is working. With the temporary powerline in
place, data and results from the session was finally downloaded from
the Observatory at 2022-12-22 11:00.
2022-12-22 pm
The
following observations were evident following the basic investigations and
observations :
- Router was working ok. All computers were working ok.
- Power to the observatory is operating ok through the main powerline. All
devices operating normally. ~
- 'Ethernet over Powerline' is
working ok within the house
- The 'Ethernet over PowerIine' plugs
themselves are functioning ok
- Ethernet cables seem to be all
functioning ok
- 'Ethernet over Powerline' to Observatory works ok
through temporarily laid powerline
- 'Ethernet over Powerline' has
previously operated ok through the main powerline, and worked again for the
nearly two hour period on 2022-12-20 (18:30 to 20:15)
It would seem
that there is some sort of interference issue with the power circuit to the
observatory or within the observatory itself ?
Began a series
of random tests and eventually got the Ethernet working over Observatory's
Powerline again for a short time (60 minutes) before it went down again.
Triggeing the resumption may or may not have been a result of temporarily
disabling the Zigbee Network, removing the Conbee II USB stick and turning
off the Hue Smart Plugs in the AllSky/Weather Cabinet (Pulsar Dome,
Dehumidifier, AllSky Heater and Aux Light). Ethernet was up for
over an hour but then went down again at around 14:25.
Got Ethernet running again at 15:50 (again this was after disabling
Zigbee Network but again it was unclear if this was critical or it was the
effect of turning off/turning on the Ethernet over Powerline Plug (probably
not) or leaving it off for 5 minutes and only then turning it back on again
(but later on showed that turning Ethernet OverPowerline at router end for
10 mins didn't resolve issue)
The temporary Powerline whilst useful
for diagostics is not viable workaround even for a short period as it mean
leaving Observatory Door and Garage Door open.
So what could be
preventing reliable use of the Observatory Main Powerline
- Is
it due to issue in the powerline to Observatory, a small short of something.
? (But has been working and still works at least part time, so not a
terminal failure )
- Could it be an intermittant issue with
Ethernet Hub in Observatory. However it was running ok with the
temporary powerline and works ok for at least some of the time when using
ethernet over Observatory's main powerline. (Could test by connecting
Observatory Computer directly to the Ethenet PowerLine plug ?)
-
Could it be related to ground currents ? (powerline to observatory runs
underground and could be affected)
- Could it be related to power
glitches in the power-supply ? (Powerline to Observatory carries lower
voltage due to its distance and might be more exposed to a weakness or
instability in the supply
- Could it be related to Power Socket
issue on one particular socket in the kitchen whose switch has become stuck
in last few days (could it be weakening the ethernet over powerline signal
just enough to cause the issues).
- Could it be related to Zigbee
Network (But Zigbee Network has been running with problems for the
Ethernet Connectivity in the past 8 weeks). Could tTest by disabling
network, regain Ethernet connectivity)
- Could it be a Kaspersky Firewall
issue. (Ethernet again went down at 16:08. Connection to both
computers is lost at the same time ?, so why would Kaspersky kick in at the
same time ?)
- Issue is unrelated to AllSky Heater/Dehumidifier, as the
power to both Smart Plugs was turned off at time of the 16:09
disconnection).
Disabled Zigbee Network at 16:40 (pulling out the
Conbee II USB stick) but it didn't immediately resolve problem,
With
the Zigbee still disabled, turned off Power Sockets using Zigbee Smart Plugs
(Pulsar Dome, Dehumidifier, AllSky Heater and Aux Light) and reset the
Ethernet Over Powerline Adapter, and eventually got Ethernet
Connectivity back again (unclear what the precise critical factor was).
Left the Zigbee Network and associated plugs disconnected, and monitored the
situation over the next 12- 18 hours using a combibation of green Ping flags
in AstroMove and up to date timestamps on AllSkyWeather and
Observatory charts on Website.
2022-12-23
a) Ethernet Connectivity is working ok with the Zigbee Network
disabled and with plugs to Pulsar Dome, Dehumidifier, AllSky Heater and Aux
Light all turned off (15 hour test)
b) Dome noted to be a
couple of degrees from its standard park position (Az 90) meaning that
Induction Charging was also certainly compromised. Could this have set
up current fluctuations that caused problems to the 'Ethernet
over PowerLine' signal . Dome moved to its correct Park position and
resynced it to Az 90 using DeviceHub's Dome Tab.
c) Ethernet
Connectivity is working ok with the Zigbee Network Connected and with power
connected to Aux Light's smart plug and with power connected directly
to Pulsar Dome (ie without Smart Plug) (6 hour test)
c)
Ethernet Connectivity is working ok with the Zigbee Network Connected
and with power connected to the Aux Light's, Dehumidifier's and AllSky
Heater's smart plugs and with power connected directly to Pulsar Dome (ie
without Smart Plug) (4 hour test)
d) Ethernet
Connectivity issue returned after 35 mins with the Zigbee Network Connected
and with power connected to the Aux Light, Dehumidifier, AllSky Heater and
Pulsar Dome via smart plugs (started at 22:15, Ethernet went down at
22:50 as part of planned 9 hour test, but came on before midnight
2022-12-24.
a) Added a LAN Ping monitor
to AstroMove 1.9.9 to record when computers are reachable with a ping and
when they are not.
b) No outages in Observatory Ethernet
2022-12-25.
a) No outages in
Observatory Ethernet
2022-12-26.
a) Added a LAN Speed
Check to measure LAN performance and help in the identification of
improvements to improve LAN performance & speed
b) Measurements
identified that earlier relocation of Observatory Ethernet Over Powerline
adapter has a deterimental affect on LAN performance
- Av Speed
with adapter in socket 3 : 5.78 Mbps, 0.72 MB/s
(Laptop9), 4.58 Mbps, 0.57 MB/s (Laptop7)
- Av
Speed with adapter in socket 1 : 19.72 Mbps, 2.47 MB/s
(Laptop9), 23.91 Mbps, 2.99 MB/s (Laptop7), VNC to Laptop9
on
- Av Speed with adapter in socket 1 : 23.67 Mbps,
2.96 MB/s (Laptop9), 23.84 Mbps, 2.98 MB/s (Laptop7) , VNC to
Laptop9 off
c) No outages in Observatory Ethernet
Findings & Conclusions
The exact cause of the
issue before, during and after session S1074 is uncertain.
-
It could have been due to a temporary issue with the Power Supply (spikes,
lowered voltage ?)
- It may have been due to the interference
effect of a particular fluctuation in current supply due to power induction
charging of the Dome Shutter when it was sitting at a particular offset (but
this hasn't been previously seen)
An important finding was that even
if the LAN connection to house computer and to internet does down the normal
LAN communications between Observatory and AllSkyWeather Computers wasn't
interrupted. This is significant and means that a session can be expected to
and be permitted to continue as the session can still be conducted safely
based on the Observatory Cloud Sensor and AllSky Camera. The chance of
success session is probably similar. The one area of slightly enhanced
risk is that the usually available 60 min precipitation forecast from radar
wouldn't be available unless it can still be gleaned over wifi.
Actions
Make a number of small fixes and improvements to AstroMain Zigbee reporting
& ObsViewer picture drawing.
Keep Observatory's Ethernet over Powerline adapter on Socket 1 (one that is closed to observatory's power supply input).
Issue deemed to be resolved 2022-12-25. No LAN or Ethernet connection issues during sessions S1075 & S1076 (2022-12-26 & 2022-12-27).
Update:
There was a further period of
interruption to LAN/Router & Internet Connection in Sept 2024 during which
there were 5 outages within a 24 hour period (see
Investigation -
Interruptions in LAN & Internet Connectivity, 2024-09-08 ). An
investigation concluded that user attempts to fix/shortern the outages
probably didn't work and that certain actions like resetting the
Observatory's Ethernet Switch can actually lead to more problems. It is
probably best to leave thing to resolve themselves and only intervene if
connection is still down after 24 hours. An improvement was made in
AstroMain 3.69.6 to provide better recording & alerting of LAN/Internet
Outages. A proposal was made to consider installing a dedicated
Ethernet Cable between Observatory and House/Router.
Update
2024-10-19
A Cat 6 Ethernet Cable was finally installed between
Router and Observatory's Ethernet Switch on 2024-10-18 / 2024-10-19. As well
as the expected better reliability intial speed tests show that the Cat6
Wired Ethernet Connection to Observatory is 4x faster than the preceeding
Ethernet Over PowerLine Connection. For more details see
Observatory - Wired Ethernet Cable Connection, 2024-10-18/19 .
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This Web Page: | Notes - Session 1074 (2022-12-20) |
Last Updated : | 2024-10-19 |
Site Owner : | David Richards |
Home Page : | David's Astronomy Web Site |