Re: Install Firefox
On Tue, May 28, 2013 at 9:40 PM, Basanta Shrestha basanta.shres...@olenepal.org wrote: Adding firefox did install firefox but gave following error while trying to execute on XO: $ firefox Error: Platform version '13.0' is not compatible with minVersion = 12.0 maxVersion = 12.0 - Looks like an incompatibility with xulrunner, which hasn't been successfully built on F17 in a while: http://arm.koji.fedoraproject.org/koji/packageinfo?packageID=10131 Maybe Peter has some comments. You could try an older version of firefox to match the latest (old) version of xulrunner available. Daniel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Install Firefox
On Wed, 2013-05-29 at 08:08 -0600, Daniel Drake wrote: On Tue, May 28, 2013 at 9:40 PM, Basanta Shrestha basanta.shres...@olenepal.org wrote: Adding firefox did install firefox but gave following error while trying to execute on XO: $ firefox Error: Platform version '13.0' is not compatible with minVersion = 12.0 maxVersion = 12.0 - Hi Basanta, Think this has something to do with firefox wanting a specific xulrunner version. Can you confirm what version is installed with: rpm -q xulrunner. I have a workaround that I used with F14 that should still work with this situation. Which repos are enabled in olpc-so-builder when you generate the image? Jerry Looks like an incompatibility with xulrunner, which hasn't been successfully built on F17 in a while: http://arm.koji.fedoraproject.org/koji/packageinfo?packageID=10131 Maybe Peter has some comments. You could try an older version of firefox to match the latest (old) version of xulrunner available. Daniel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [OLPC New Zealand] Auckland Testing Summary 25 May 2013
Thanks for the testing. All the defects/enhancements were recorded in our tracker On 25 May 2013 15:07, Tom Parker t...@carrott.org wrote: Auckland Testing Summary 25 May 2013 Who: Alana, Barry, Charlotte, Fabiana, Hans, John, Oliver, Tabitha, Tom Testing olpc au build on XO-1.75 and dextrose on XO-4 One Education OS 1.2 (build au891) on XO-1.75: The laptop fails to start with a white screen after choosing the name, age and colour if you enter a very large age. See https://sugardextrose.org/** issues/3973 https://sugardextrose.org/issues/3973 After restarting you get another opportunity to enter the name, age and colour and things proceed normally if you enter a smaller age. Write 79 Moa and Mohua - Sometimes you can’t toggle underline or bold if you select text across two lines. The behaviour here seems quite complex and not consistent. On one occasion we selected two lines and toggling underline caused the second line to toggle but not the first. Moa - Can insert picture, table, change colour and fonts. Collaboration on write between “nz” and “nzbuild”. Both laptops contributions are being added in black (previous builds have had different colours for different contributors). When highlighting some text and resizing it changed the colour (we did not touch the colour palette). Manage to hang write by clicking on the “export to hypertext button”. The export dialog did not appear, write still repainted the screen (covering and uncovering it caused the menu bars and documents to reappear), but clicking on buttons or writing in the document didn’t do anything. The log was very strange but unfortunately we didn’t get a copy of it at the time and the laptop appears to have deleted it. We were unable to reproduce this. Memorize - Collaboration in Memorize between “nz” and “nzbuild” failed first time on local area network wifi, but restarting and carrying out further tests could not reproduce. Both laptops tried initiating, played several games each time, and tried creating own game. Maze works on “nz”. Browse works on “Moa”. Implode works on “nz”. Typing Turtle works. Tried to do collaborative chat on adhoc networking. Laptops could see each other but the shared chat window doesn’t show up in either laptop’s neighbourhood view. Repeating this by closing the chat and opening it again causes things to work. Jam2Jam hangs every time every time you click the Regae button. It also hangs if you open it, click the keyboard button at the bottom and then click the stop button. In both cases it stops repainting it’s screen and consumes no cpu. There is nothing interesting in the log. Raised https://sugardextrose.org/**issues/3970https://sugardextrose.org/issues/3970 The built in book The blue sky has very small text, and zooming in the browser makes it smaller because the the controls get bigger leaving less room for the page. Also the home button inside the page doesn’t seem to do anything. You can launch Record more than once. Any record started while another record has locked the camera just show a white screen in the preview. Perhaps record should refuse to start when it can’t get the camera. If you quit the first record and the quit the second record, the second record will hang. You can’t shut down the laptop after encountering this, it hangs on the goodbye screen. Did some collaboration testing in Record with two XOs. Both XOs took photos and the photos appeared on each others XOs successfully. Where should we raise Maori localisation issues? In Maori, Moon-13 fails to start and Clock-9 doesn’t speak. The days of the week are also written in English in Clock. We reported this in October: http://lists.laptop.org/**pipermail/olpc-nz/2012-**October/001640.htmlhttp://lists.laptop.org/pipermail/olpc-nz/2012-October/001640.htmland for moon at least, Gary identified the problem in one of the following messages on the mailing list. Raised https://sugardextrose.org/** issues/3971 https://sugardextrose.org/issues/3971 The confirmation dialog for removing an item from the journal is not translated properly, it has “Continue”. The names of items in the journal in Maori are all squashed up, see https://plus.google.com/**photos/118146064923365210751/** albums/5468706263336090945/**5881722567507197362?banner=** pwapid=5881722567507197362**oid=118146064923365210751https://plus.google.com/photos/118146064923365210751/albums/5468706263336090945/5881722567507197362?banner=pwapid=5881722567507197362oid=118146064923365210751and https://plus.google.com/**photos/118146064923365210751/** albums/5468706263336090945/**5881722567507197362?banner=** pwapid=5881722567507197362**oid=118146064923365210751https://plus.google.com/photos/118146064923365210751/albums/5468706263336090945/5881722567507197362?banner=pwapid=5881722567507197362oid=118146064923365210751for the same laptop in maori and english. Raised
Re: #12690 NORM 13.2.0: Include updated activities in 13.2.0
On Wed, May 29, 2013 at 4:46 PM, Zarro Boogs per Child bugtrac...@laptop.org wrote: #12690: Include updated activities in 13.2.0 +--- Reporter: godiard | Owner: dsd Type: defect| Status: new Priority: normal| Milestone: 13.2.0 Component: build-system | Version: not specified Resolution:|Keywords: Next_action: add to build |Verified: 0 Deployment_affected:| Blockedby: Blocking:| +--- Comment(by dsd): Write: ok Read: not pushed to git Paint: not pushed to git Fototoon: ok Jukebox: ok Terminal: not pushed to git Turtle art: need info about the regression being solved Never filed a ticket, but the Butia team in .UY pointed out (correctly) that in speeding up launch time, I inadvertently prevent projects from loading from the Journal. FIxed in v179. -walter -- Ticket URL: http://dev.laptop.org/ticket/12690#comment:3 One Laptop Per Child http://laptop.org/ OLPC bug tracking system -- Walter Bender Sugar Labs http://www.sugarlabs.org ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Install Firefox
Please check my repo list at this configuration file. http://pastebin.ca/2384881 and xulrunner and firefox version xulrunner-13.0-1.fc17.armv7vl firefox-12.0-1.fc17.armv7hl Thank you. On Wed, May 29, 2013 at 8:38 PM, Jerry Vonau jvo...@shaw.ca wrote: On Wed, 2013-05-29 at 08:08 -0600, Daniel Drake wrote: On Tue, May 28, 2013 at 9:40 PM, Basanta Shrestha basanta.shres...@olenepal.org wrote: Adding firefox did install firefox but gave following error while trying to execute on XO: $ firefox Error: Platform version '13.0' is not compatible with minVersion = 12.0 maxVersion = 12.0 - Hi Basanta, Think this has something to do with firefox wanting a specific xulrunner version. Can you confirm what version is installed with: rpm -q xulrunner. I have a workaround that I used with F14 that should still work with this situation. Which repos are enabled in olpc-so-builder when you generate the image? Jerry Looks like an incompatibility with xulrunner, which hasn't been successfully built on F17 in a while: http://arm.koji.fedoraproject.org/koji/packageinfo?packageID=10131 Maybe Peter has some comments. You could try an older version of firefox to match the latest (old) version of xulrunner available. Daniel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel -- Basanta Shrestha Network Engineer Open Learning Exchange (OLE) Nepal Tel: +977.1.551, 5520075 Ext. 303 Cell: +977.9818 605110 http://www.olenepal.org ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Install Firefox
On Thu, May 30, 2013 at 6:18 AM, Basanta Shrestha basanta.shres...@olenepal.org wrote: Please check my repo list at this configuration file. http://pastebin.ca/2384881 and xulrunner and firefox version xulrunner-13.0-1.fc17.armv7vl firefox-12.0-1.fc17.armv7hl Firefox and xulrunner 17 are the late known good (and matching) builds for Fedora 17, you need the major versions to be matching (so 12/13/17) but if you were pulling in all the latest stable updates into the build you would have matching ones AFAICT from koji so there's some other issue. I'm not sure what the following lines translate to but you should never use the koji repositories as repos as they contain all sorts of randomly tagged bits that the release repos don't. olpc_frozen_1=0,koji.dist-f17-armv7hl olpc_frozen_2=0,koji.dist-f17-armv7hl-updates-12.1.0 Peter Thank you. On Wed, May 29, 2013 at 8:38 PM, Jerry Vonau jvo...@shaw.ca wrote: On Wed, 2013-05-29 at 08:08 -0600, Daniel Drake wrote: On Tue, May 28, 2013 at 9:40 PM, Basanta Shrestha basanta.shres...@olenepal.org wrote: Adding firefox did install firefox but gave following error while trying to execute on XO: $ firefox Error: Platform version '13.0' is not compatible with minVersion = 12.0 maxVersion = 12.0 - Hi Basanta, Think this has something to do with firefox wanting a specific xulrunner version. Can you confirm what version is installed with: rpm -q xulrunner. I have a workaround that I used with F14 that should still work with this situation. Which repos are enabled in olpc-so-builder when you generate the image? Jerry Looks like an incompatibility with xulrunner, which hasn't been successfully built on F17 in a while: http://arm.koji.fedoraproject.org/koji/packageinfo?packageID=10131 Maybe Peter has some comments. You could try an older version of firefox to match the latest (old) version of xulrunner available. Daniel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel -- Basanta Shrestha Network Engineer Open Learning Exchange (OLE) Nepal Tel: +977.1.551, 5520075 Ext. 303 Cell: +977.9818 605110 http://www.olenepal.org ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Install Firefox
On Thu, 2013-05-30 at 06:50 +0100, Peter Robinson wrote: On Thu, May 30, 2013 at 6:18 AM, Basanta Shrestha basanta.shres...@olenepal.org wrote: Please check my repo list at this configuration file. http://pastebin.ca/2384881 and xulrunner and firefox version xulrunner-13.0-1.fc17.armv7vl firefox-12.0-1.fc17.armv7hl Firefox and xulrunner 17 are the late known good (and matching) builds for Fedora 17, you need the major versions to be matching (so 12/13/17) but if you were pulling in all the latest stable updates into the build you would have matching ones AFAICT from koji so there's some other issue. I'm not sure what the following lines translate to but you should never use the koji repositories as repos as they contain all sorts of randomly tagged bits that the release repos don't. olpc_frozen_1=0,koji.dist-f17-armv7hl olpc_frozen_2=0,koji.dist-f17-armv7hl-updates-12.1.0 Peter Thought that was the official way of using OOB once the release enters the frozen state. Please advise. Jerry Thank you. On Wed, May 29, 2013 at 8:38 PM, Jerry Vonau jvo...@shaw.ca wrote: On Wed, 2013-05-29 at 08:08 -0600, Daniel Drake wrote: On Tue, May 28, 2013 at 9:40 PM, Basanta Shrestha basanta.shres...@olenepal.org wrote: Adding firefox did install firefox but gave following error while trying to execute on XO: $ firefox Error: Platform version '13.0' is not compatible with minVersion = 12.0 maxVersion = 12.0 - Hi Basanta, Think this has something to do with firefox wanting a specific xulrunner version. Can you confirm what version is installed with: rpm -q xulrunner. I have a workaround that I used with F14 that should still work with this situation. Which repos are enabled in olpc-so-builder when you generate the image? Jerry Looks like an incompatibility with xulrunner, which hasn't been successfully built on F17 in a while: http://arm.koji.fedoraproject.org/koji/packageinfo?packageID=10131 Maybe Peter has some comments. You could try an older version of firefox to match the latest (old) version of xulrunner available. Daniel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel -- Basanta Shrestha Network Engineer Open Learning Exchange (OLE) Nepal Tel: +977.1.551, 5520075 Ext. 303 Cell: +977.9818 605110 http://www.olenepal.org ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [Server-devel] XSCE 0.3
On Tue, May 28, 2013 at 11:53 PM, Tony Anderson tony_ander...@usa.netwrote: Hi, This is going to take some time to provide a useful reply. Perhaps, the easiest way is to comment on the XSCE specification: Thanks for your thorough analysis. I wasn't sure if anyone actually read the project spec:) We create the project spec by informally establishing a consensus about what we think is important and achievable given our resources and time before the next feature freeze. In everyday usage it provides various services which extend capabilities of the connected laptops while being totally transparent to the user. The school server provides the storage capacity not available on the XO. In the deployments I serve, there is no internet access. The school server is 'an internet in a box'. While this in not our primary deployment target, this is a direction that I would like to see the project go. As we stabilize the services, it would be valuable to add the tools for curators to maintain local content. NEW IN 0.4 - XS-Stats - Enables deployments to collect anonymous student usage. School staff need the ability to keep a 'gradebook' with information on student accomplishments that is not anonymous. The above feature is a need for the deployers, not the school. NEW IN 0.4 - Backup and Restore. This has been provided since XS-0.4. The primary problem here is that the backup is considered as a backup (for use in emergency restore situations). The real need is to maintain the Journal on the school server for active recall as needed. Over time, the Journal grows to fill the available capacity on the XO. Currently, the fix is to delete Journal items. The current backup also deletes these items from the backup. Currently, I am using a modified ds_backup.py script which treats the Journal as a store for documents. These are uploaded to the school server. Metadata only entries are uploaded to a log and deleted from the datastore. The user has the option to delete documents from the data store and then to reload them from the school server. Have you looked at the webdev work to used provide additional storage to laptop. NOTE: Our web-dev work is currently blocked by our ability handle external USB harddrives... which I think will land in 0.4 School servers can be either an XO or standard x86 based hardware. 1. Large memory capacity (2GB+) 2. Large persistent store (500GB+) 3. Operates directly from 12vdc battery (e.g. car or marine deep cycle) 4. Low power consumption (e.g. 2x XO 4.0). Power consumption dictates the size of the solar panel required to charge the batteries. 5. Headless operation. Schools with a monitor, keyboard, and mouse attached the school server will be tempted to use them as a client system - with negative impact on stability. 6. Low cost (e.g. 2x an XO or $400) Most other requirements are satisfied automatically be the system chip set (e.g usb ports, ethernet port, etc.) I tend to agree with you here. Our emphasis on XOs was to start with a known piece of reference hardware, the XO-1.75, and expand from there. With a little tweaking XSCE works on most standard x86 based hardware. [edit] Standard Hardware For greater flexibility some schools will want to use standard hardware. Trim-Slice. Raspberry Pi The Trim-Slice indeed appears to meet the requirements for a school server. I plan to try one in the next few weeks. One interesting possibility is to boot from an SD card for installation and trouble-shooting (via SSH). The Raspberry Pi is attractive (esp. for low cost); however, I am concerned about it's physical packaging in a school environment. +1 Each release we are going to try to add one of two pieces of hardware. Command line configuration/administration should eventually be discouraged as the system matures. Future target users are often not familiar with Linux system administration. Initial setup or fixing a problem with their server is not a good time to introduce system administration skill. System administrators and a deployments development team will use the command line because it is the most efficient tool available. In general, server administration is not and should not be done on a production machine. This is interesting. One of the most common requests I hear from deployments is What do we do if we don't have a Bernie, Daniel, or Tony handy? [edit] Remote Configuration NEW IN 0.4 -- Remote administration – There are several systems such as CFEngine and puppet which enables remote management. [edit] Command Line The problem here is that the school server is not connected to the internet. There are many available and proven technologies to manage networked computers. It would be handy if the XOs at a school could be managed from the school server. Perhaps Puppet is the right technology for this task. Where a 'mother
[Server-devel] 12 Volt power system for School Servers.
Tony could you share more information about your work on 12 Volt power supplies for School Servers? Whenever I see a School Server setup containing a 12V Battery, an inverter, a power strip, and a couple of 120V to 12V power supplies to provide power for the server and the AP... my eyes start to tear up:( The situation I am looking at has power part of the day so we can recharge the battery. To keep things simple we would like to use a Trimslice or XO-4 and off the shelf AP. Ideally we would like to have 'kit' that contained everything except that battery that can be set up and tested before arriving at the deployment. Thanks -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
On Wed, May 29, 2013 at 1:03 PM, David Farning dfarn...@activitycentral.com wrote: Tony could you share more information about your work on 12 Volt power supplies for School Servers? Whenever I see a School Server setup containing a 12V Battery, an inverter, a power strip, and a couple of 120V to 12V power supplies to provide power for the server and the AP... my eyes start to tear up:( The situation I am looking at has power part of the day so we can recharge the battery. To keep things simple we would like to use a Trimslice or XO-4 and off the shelf AP. Ideally we would like to have 'kit' that contained everything except that battery that can be set up and tested before arriving at the deployment. Thanks -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel What about an off-the-shelf SoHo UPS unit? cheers, Sameer ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
The piece I am looking at is reducing the losses between the battery and the server/AP. Several systems have a 12V Battery which is inverted to 120AC which is then transformed back to low voltage DC for input to the server/AP. That doesn't seem very efficient. Dave On Wed, May 29, 2013 at 3:29 PM, Sameer Verma sve...@sfsu.edu wrote: On Wed, May 29, 2013 at 1:03 PM, David Farning dfarn...@activitycentral.com wrote: Tony could you share more information about your work on 12 Volt power supplies for School Servers? Whenever I see a School Server setup containing a 12V Battery, an inverter, a power strip, and a couple of 120V to 12V power supplies to provide power for the server and the AP... my eyes start to tear up:( The situation I am looking at has power part of the day so we can recharge the battery. To keep things simple we would like to use a Trimslice or XO-4 and off the shelf AP. Ideally we would like to have 'kit' that contained everything except that battery that can be set up and tested before arriving at the deployment. Thanks -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel What about an off-the-shelf SoHo UPS unit? cheers, Sameer -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
On Wed, 2013-05-29 at 15:03 -0500, David Farning wrote: Tony could you share more information about your work on 12 Volt power supplies for School Servers? Whenever I see a School Server setup containing a 12V Battery, an inverter, a power strip, and a couple of 120V to 12V power supplies to provide power for the server and the AP... my eyes start to tear up:( Is the inverter really needed for a XO? The step-down transformer used on the XO puts out 13.5v but the XOs only need 11 volts to charge[1]. Therefore I believe you could run and/or charge the XOs directly from a 12v source like a storage battery, perhaps though a regulator. I just don't want to cut the cord off of a working power supply to find out. The situation I am looking at has power part of the day so we can recharge the battery. To keep things simple we would like to use a Trimslice or XO-4 and off the shelf AP. Most of the networking devices use a transformer also but with perhaps a different voltage rating, with a regulator that takes 12 DC in we can output the voltage needed for the lower (12v) voltage DC devices. If they run on usb power or 12v dc this should be do-able. Ideally we would like to have 'kit' that contained everything except that battery that can be set up and tested before arriving at the deployment. Thanks Recharging the storage battery is limited by the means that are available to recharge the storage battery perhaps via solar or wind, and is the related to the issue of how many XOs are in use that need charging. Jerry 1. http://wiki.laptop.org/index.php?title=Battery_and_power -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
On Wed, 2013-05-29 at 15:42 -0500, David Farning wrote: The piece I am looking at is reducing the losses between the battery and the server/AP. See my earlier response. Several systems have a 12V Battery which is inverted to 120AC which is then transformed back to low voltage DC for input to the server/AP. That doesn't seem very efficient. +1 Jerry Dave On Wed, May 29, 2013 at 3:29 PM, Sameer Verma sve...@sfsu.edu wrote: On Wed, May 29, 2013 at 1:03 PM, David Farning dfarn...@activitycentral.com wrote: Tony could you share more information about your work on 12 Volt power supplies for School Servers? Whenever I see a School Server setup containing a 12V Battery, an inverter, a power strip, and a couple of 120V to 12V power supplies to provide power for the server and the AP... my eyes start to tear up:( The situation I am looking at has power part of the day so we can recharge the battery. To keep things simple we would like to use a Trimslice or XO-4 and off the shelf AP. Ideally we would like to have 'kit' that contained everything except that battery that can be set up and tested before arriving at the deployment. Thanks -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel What about an off-the-shelf SoHo UPS unit? cheers, Sameer -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
On Wed, May 29, 2013 at 04:38:06PM -0500, Jerry Vonau wrote: Is the inverter really needed for a XO? The step-down transformer used on the XO puts out 13.5v but the XOs only need 11 volts to charge[1]. Therefore I believe you could run and/or charge the XOs directly from a 12v source like a storage battery, perhaps though a regulator. I just don't want to cut the cord off of a working power supply to find out. Cut the cord about 20cm from the power supply, and fit a screw terminal, so the cord can be reassembled if needed. Yes, the XO will safely run direct from any 12V lead-acid storage battery. The battery will not permit the voltage to exceed what the XO can accept. (It isn't technically a step-down transformer, but a switch-mode power supply, but no matter.) -- James Cameron http://quozl.linux.org.au/ ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
Thanks james, Any thoughts on powering the AP? On Wed, May 29, 2013 at 4:45 PM, James Cameron qu...@laptop.org wrote: On Wed, May 29, 2013 at 04:38:06PM -0500, Jerry Vonau wrote: Is the inverter really needed for a XO? The step-down transformer used on the XO puts out 13.5v but the XOs only need 11 volts to charge[1]. Therefore I believe you could run and/or charge the XOs directly from a 12v source like a storage battery, perhaps though a regulator. I just don't want to cut the cord off of a working power supply to find out. Cut the cord about 20cm from the power supply, and fit a screw terminal, so the cord can be reassembled if needed. Yes, the XO will safely run direct from any 12V lead-acid storage battery. The battery will not permit the voltage to exceed what the XO can accept. (It isn't technically a step-down transformer, but a switch-mode power supply, but no matter.) -- James Cameron http://quozl.linux.org.au/ -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
On Wed, May 29, 2013 at 04:51:47PM -0500, David Farning wrote: Any thoughts on powering the AP? They are all different. First, select an AP that says it has a 12V input. I would record the voltage without load emitted by the power supply supplied by the manufacturer. This is a known maximum voltage that the AP can take. Then I would record the voltage on load. This is a known minimum voltage. Then I would record the input voltage specifications of the access point using the manufacturer's documentation. This is usually a typical voltage, but sometimes they include a maximum or minimum. If there was no documentation, I'd ask them, though perhaps with no great expectation of success. Taking the minimum and maximum of those three values, I'd compare them to the lead-acid battery charge cycle operating range of 10V to 15V. If there remains any doubt (e.g. they haven't specified a maximum), I would attach the AP to a variable power supply and gradually ramp it up to 15V, checking for sudden drop of current (a blown fuse), or excessive operating heat. Once I'm happy, I would cut the cable as far from the device as possible, and reterminate it there. Before cutting, I would discharge the power supply capacitors ... saves wear and tear on wire cutters. If the AP was USB powered Wifi dongle, the problem goes away. -- James Cameron http://quozl.linux.org.au/ ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
On Wed, May 29, 2013 at 3:26 PM, James Cameron qu...@laptop.org wrote: On Wed, May 29, 2013 at 04:51:47PM -0500, David Farning wrote: Any thoughts on powering the AP? They are all different. Yep. The one we use in Bhagmalpur (India) and in Jamaica is the Ubiquiti Picostation2 unit that runs off a PoE injector. Ours run off 110/220V AC, but an AP that can run over 48V PoE can use a DC-to-DC PoE unit to power it from a 12V battery source. cheers, Sameer First, select an AP that says it has a 12V input. I would record the voltage without load emitted by the power supply supplied by the manufacturer. This is a known maximum voltage that the AP can take. Then I would record the voltage on load. This is a known minimum voltage. Then I would record the input voltage specifications of the access point using the manufacturer's documentation. This is usually a typical voltage, but sometimes they include a maximum or minimum. If there was no documentation, I'd ask them, though perhaps with no great expectation of success. Taking the minimum and maximum of those three values, I'd compare them to the lead-acid battery charge cycle operating range of 10V to 15V. If there remains any doubt (e.g. they haven't specified a maximum), I would attach the AP to a variable power supply and gradually ramp it up to 15V, checking for sudden drop of current (a blown fuse), or excessive operating heat. Once I'm happy, I would cut the cable as far from the device as possible, and reterminate it there. Before cutting, I would discharge the power supply capacitors ... saves wear and tear on wire cutters. If the AP was USB powered Wifi dongle, the problem goes away. -- James Cameron http://quozl.linux.org.au/ ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
On Wed, May 29, 2013 at 5:26 PM, James Cameron qu...@laptop.org wrote: If the AP was USB powered Wifi dongle, the problem goes away. Speaking of, and this would only be appropriate for extremely small deployments, but I started messing around on the XSCE with hostapd with a wifi dongle this very afternoon. It's been on my wishlist for a long time, but earlier kernels didn't have support and it is such a PITA to compile the XO kernel. Anna ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
Just a reminder to include po...@lists.laptop.org if this discussion advances, the tightly focused electrical/energy list run by Richard Smith for many years to come God willing =) http://lists.laptop.org/listinfo/power On Wed, May 29, 2013 at 8:46 PM, Anna ascho...@gmail.com wrote: On Wed, May 29, 2013 at 5:26 PM, James Cameron qu...@laptop.org wrote: If the AP was USB powered Wifi dongle, the problem goes away. Speaking of, and this would only be appropriate for extremely small deployments, but I started messing around on the XSCE with hostapd with a wifi dongle this very afternoon. It's been on my wishlist for a long time, but earlier kernels didn't have support and it is such a PITA to compile the XO kernel. Anna ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
Hi, The setup at the Kokobe Primary school in Lesotho has a small solar panel (too small) which attempts to charge two car batteries (deep cycle would be better but not available). The router (Belkin) runs directly from the battery (we cut the cable). Linksys and other routers I have used all run on 12vdc at 1A. The MSI server does not run on 12vdc because of the design of it's power supply which requires a higher voltage (15vdc works). I purchased a Zotac which also uses an Atom processor but houses a 2.5in drive. It requires 19vdc. Most standard laptops require 19vdc at 3.2A (maximum) to charge the batteries. I suspect the MSI and Zotac simply use laptop hardware for the power supply even though no battery is involved. The router problem is that most home routers ($30 variety) can handle a limited number of connections (less than a classroom of XOs). OLE Nepal has found that a TP-Link router with DDWRT handles 25 connections (15 with the delivered firmware). In any case, a school really should have a router per classroom to provide enough connections (not to increase signal strength). OLE Nepal powers all of the routers in a school from the same UPS that powers the server so that the network will continue to operate in a power failure. Since the routers are also connected by an ethernet cable, PoE would be quite useful. This discussion is relevant because 12vdc does not travel well over long distances. It may be necessary in a school with multiple classrooms to use an inverter to provide 110 or 220vac to the routers via PoE. So far in Lesotho, the laptops have been used in a single classroom next to the server and router so I don't have live experience in distributing routers. We will face that problem next year at the Nohana school which has two classroom buildings about 50m apart and where the teachers want to use the laptops in their own classroom. Tony ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] 12 Volt power system for School Servers.
Tony makes an interesting point that may be new to some: On Thu, May 30, 2013 at 06:47:26AM +0200, Tony Anderson wrote: This discussion is relevant because 12vdc does not travel well over long distances. It may be necessary in a school with multiple classrooms to use an inverter to provide 110 or 220vac to the routers via PoE. As the distance between the battery bank and the access point increases, so too does the required _diameter_ of copper cable. Copper cable is quite valuable, and easily traded. It can be a good security practice to avoid installing too much of it. If the cable is too thin, the power demand by an access point causes too much of a voltage drop. For instance, one might put 12V DC in one end, and get 10V DC out the other end. The access point may still work fine. But some of the power will be lost as heat in the cable, lowering efficiency. At some point, depending on cost, reliability, and availability of equipment, it is worth operating at a higher voltage. The options would seem to be Power over Ethernet (PoE), which will yield 12.95W (IEEE 802.3af-2003) or 25.5W (IEEE 802.3at-2009), or an inverter with a separate power circuit. My best guess is that PoE will be cheaper, because a power circuit installed to meet electrical regulations would tend to be designed for the minimum domestic power standard of the country. For example, in Australia the minimum is 10A at 240V, or 2400W. The mass of copper is far more than what PoE would require. Then there's the cost of a 12V input PoE power sourcing equipment (PSE). -- James Cameron http://quozl.linux.org.au/ ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
