Re:I love the math they did to come up with this..
on
Wi-Fi Times Sixteen
·
· Score: 1
Lets use an example with 100 users and the $8000 8-channel device (maybe the $4000 4-channel device would work well enough?).
Ethernet: Cable run average: $100 (from another post) = $10000 5 24-port switches: $500 - $2000 depending on quality
Wireless: Device: $8000 100 Wireless Cards: $5000
More likely if you are deploying a wireless network solution you will have a lot of laptop users, wireless PDAs and phones too... wireless is usually built into these devices, so you might only need 50 wireless cards for desktops. And if you've already got a wired network and just want to support the 50 managers with fancy laptops, then that's $400 per manager to save them looking for an ethernet jack and cable every time they have a meeting or whatever. Not really a big cost is it?
The cost is working out fairly equal, to be honest. Well, the single point of failure issue might be raised, but at least it is easy to work out where the problem is!
As for having 10 separate APs ($1000), with 10 cable runs ($1000) and a single switch ($200) and installation ($1000), I'm sure that most managers would opt for the quicker solution that has less disruption.
They are all directional. In the 16 channel version, the 802.11a channels are directed at 30 degrees to the previous one, and each has a 60 degree spread. That should extend the range a bit - even if the diameter of the total covered area only doubled over using a single AP with an undirected antenna, that is still 4x the area covered. If the diameter of the wireless range was 3x larger, that is 9x the area covered. 4x - 16x more area.
Anyone here know what range increase is more likely with a solution like this?
Re:I love the math they did to come up with this..
on
Wi-Fi Times Sixteen
·
· Score: 2, Informative
Well, ignoring the fact that multiple clients can connect to the same AP, if you are in an office that doesn't have a wired infrastructure, or it needs upgrading*, then the cost of getting someone to rewire and patch could be quite high, especially if there are 100 people on the network (e.g., an office). 10000ft** of cat5e might not cost too much on its own, but the installation costs will cost a lot more, as would 8 decent 24-port GigE switches. And then all the laptop people will still moan about needing wireless access.
And think about having one of these at a convention or trade show... very handy.
* yes, I know that if the network 'needs' upgrading then there is probably a bandwidth need. ** yes, you can install switches at each block of desks to reduce cable runs. And so on.
You've had 226 recharge cycles on the battery, and the capacity is under 3000mAh now, instead of the original 4200. You've lost around 1250mAh @ 12V over the 18 months.
Did you run that with the external power in though? I only get 12.4V when it is plugged in.
Whether you want another battery is up to you though. Is the battery life getting to be an issue?
What I've got at the moment is a program that outputs to CSV so you can plot all the variables over time in Excel, OpenOffice, etc.
Still, nice to know that someone else wanted the same sort of thing too. I'm not up to date on Cocoa programming though, maybe it'll make an interesting first application.
One day virii will sign up for Everquest or WoW accounts automatically, and fight each other there. One day you will be marvelling at your +10 Sword Of Damocles and a horde of frickin' Win32 virii will come along and kill you for it.
Worse, though, is that normal people will notice the EQ or WoW icon on their desktop, and also get trapped in the game.
Oz Broadband is anything over 128kbs.(ISDN) Laughable yes.
The important thing about broadband is the always-on status. Now 128kbps is a bit naff, but I reckon lots of people would be happy with always on 256kbps.
Of course I'm typing this in the UK on a 2Mbit connection that will be upgraded to 10Mbit within the next year apparently. Sadly the 10Mbit upgrade will coincide with bandwidth limits (75GB/30GB/5GB or thereabouts, for the different price ranges offered).
The fact that my cable connection was down for a week because of a 'weak power level' is neither here nor there:(
This new offering is best described as a mini DSLAM with a ~2.3Mbit backhaul. So even two users could potentially max it out.
And normal end-user DSL has a contention ratio of 50:1, and business DSL 20:1. The 2.3Mbit/8 users seems quite good to me.
Yeah, I'm also running Adium, Apache, Tomcat and Postgresql. In intensive times (running Eclipse J2EE view and Running a web app on the tomcat server it can chug a bit. But it still runs fine mostly, and I've got a 1GB SODIMM in the post somewhere which should get rid of the final issues.
God, do I have to type in loads of standard english text here to get it to submit? Bah! Well, here I am, stuck at home waiting for a delivery of a hard drive and drive enclosure. I'm sitting on my iBook wondering when it will turn up. I should be at work, but I can get away with not turning up as I can work from home. Foo foo foo foo. Is that a van I can hear? It appears not, no, wait, yes it is! Hurrah, a parcel! Fun fun fun fun. Gosh, I wonder if this is enough text.
No, it is not enough text. Sheesh, how frustrating. For a site for geeks, it is remarkably frustrating to post geeky stuff.
I'm just going to add logging to the script above, and then I can do what I said I'd do above.
I have 512MB in my iBook, and I never noticed issues when running Dashboard, Mail, Safari, Terminal, etc, at the same time. Hell even running Eclipse it wasn't too bad, except waking up from sleep.
What I have done though is turn off Dashboard, and I'm going to write an application to log the battery power using ioreg (from a post above) from a full charge, then compare it to running with Dashboard from a full charge.
The new iBooks also use the scrolling trackpad, so I imagine that it will be a problem for them as well?
My new iBook says it has 4 hours and 40 minutes of battery currently (just removed the power cord from a full charge). This is less than the 6 hours I expected of it, although 4.7 hours is still pretty good. I wonder if it would increase if I installed SideTrack?
Exactly. It just works, without getting in the way. The OS and apps have that extra bit of polish and pizzazz to make them special. The OS provides everything you need to interact with the hardware too, no crappy third party DVD burning apps, for example.
Nothing I used to like more as a teenager than a night on the A1200 with DPaint 4.5 and Blitz Basic 2 creating yet another silly game, or even sometimes nearly serious software. I was late for school more than once the next day...
They had to expect it to happen, if they weren't then they're extremely naïve.
I'd love Mac OS X on Intel PCs. I don't care about getting a manky cheap-black-plastic laptop booting it, but a decent cheap desktop PC, yeah. As you get older you realise certain things - (1) I ain't got the time to get Gentoo to compile, (2) No way am I gonna lose my Unix shell, (3) Nor have I got the time to work out how certain things in Linux/FreeBSD now work since the last release I tried. Mac OS X is the OS for the productive geek, and the amount of desire there is for a generic x86 version shows that many many other people out there think the same thing.
And yes, I have a nice new 1.33GHz iBook here. 'Tis weird, but I'm more productive using it than any computer previous to this one until my old Amiga. It is my first ever Mac too. Used to hate the little buggers, nasty OS, crappy keyboards, boring interface.
With things like JOGL, JOAL, etc, cross platform Java games are becoming a real option I believe. Sure, they aren't going to be up to the standards of the latest greatest 100 man yeaer computer games, but that's probably only because they haven't had 100 man years of work spent on them. With OpenGL and OpenAL, and various other technologies doing all the work, the language you write the game logic in is becoming less important.
The Light Weight Java Games Library is also a nice thing, especially as it is planned that it will be running on devices such as PDAs and phones with the next generation of mobile 3D graphics processors.
And, oddly enough, graphics creation is getting a lot easier for the smaller game development team now because instead of putting leads of effort into designing great textures, you can develop a lot of simple textures (normal map, bump map, texture map, reflectance map, etc) which is a lot easier to do. That, and pixel shaders, object instantiation, etc...
It seems to have worked in the UK however. It isn't ideal, but apparently broadband coverage is 97% of the population. Unbundling lines isn't working great, but the system has been changed recently and should mean higher uptake in the future.
Gas and Electricity are done in the same way over here, with a wholesale network provider, and the service providers all use the same (pipelines|grid) to supply power, with their own billing structure and extras on top.
This method does mean that there is still no competition in the wholesale area, then again I'd prefer that to 2 or 3 times the number of electricity pylons and/or roadworks!
My Ethical Issues in Computing class required almost $200 worth of text books. None were the same from the previous semester, and none were reused the next
Maybe there should be an 'Ethical Issues In Publishing' or 'Ethical Issues In Teaching' course then.
$200 for such a minor course? Fucking ridiculous. Have a course book and a homework book/printout, one to be reused year on year, and the other to be handed out at lectures or whatever you have in your universities.
Computing Ethics does not change drastically every year, or every decade. Anyone teaching a course on ethics with $200 course books each year that can't be reused is a complete and utter hypocrite.
What's up with your student union anyway? Maybe they're in the pocket of the publishers as well.
Should be given an automatic fail for their retardedness.
That way, they'll save money on the next few years of education.
And why are textbooks in the US so expensive? Are they custom made for each course or something? Someone mentioned them having homework questions in! So the college is too half-assed to be able to set its own? God, my opinion of the US education system went down even more. Are students just another profit group over there, used by the short-sighted ruling corporate classes who don't realise that students with $50000 debts aren't going to be buying things later on for quite some time?
When I was at university, the text books were pretty much standardised, and cost at most £30, with the occasional (but not required) book reaching £50 or so. Book costs were quite low therefore, the lecture notes that were handed out were good enough if you attended the lectures and actually did some work to understand the course. Then there were the damaged book stores, second hand book stores, and slightly-out-of-date stores that meant you could get pretty decent reasonable books for £5 or so.
I mean, there are some textbooks which are literally essential to own and which cost a lot. However these books are going to be used for years to come by the owner, if they stay in that field. They certainly don't have 'Course 2006 Homework Questions' in them.
In fact on the page there are screenshots using a 3D engine. However he doesn't want to use one for reasons he also explained on the page. He wants to explore something different, and who's to stop him?
Some of the screenshots are very arty actually, especially the spotlit CAR on minimalist road.
Now could he utilise the GPU to perform and render the 2D operations? I'm sure the bezier mathematics for the 2D renderer could be programmed somehow, but that would mean a lot of effort.
Me? I want to write 2D platform games a lá rick dangerous using a 3D engine. Classic 2D gameplay, with scaling of graphics (textures, of course) and some real depth effects and lighting effects too. Also a good way to play with pixel shaders, normal maps, bump maps, etc, which should make graphics creation a lot more simple. I hope to spend an hour or two a day on this soon, probably starting off with something simple (remake of Amstrad CPC Roland on the Ropes).
Also you might want to look up the addresses of the University of Cambridge Computer Lab (Xen) and Microsoft Research UK. I bet that XP doesn't run on Xen for marketing reasons, not because it hasn't been ported.
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Lets use an example with 100 users and the $8000 8-channel device (maybe the $4000 4-channel device would work well enough?).
... wireless is usually built into these devices, so you might only need 50 wireless cards for desktops. And if you've already got a wired network and just want to support the 50 managers with fancy laptops, then that's $400 per manager to save them looking for an ethernet jack and cable every time they have a meeting or whatever. Not really a big cost is it?
Ethernet:
Cable run average: $100 (from another post) = $10000
5 24-port switches: $500 - $2000 depending on quality
Wireless:
Device: $8000
100 Wireless Cards: $5000
More likely if you are deploying a wireless network solution you will have a lot of laptop users, wireless PDAs and phones too
The cost is working out fairly equal, to be honest. Well, the single point of failure issue might be raised, but at least it is easy to work out where the problem is!
As for having 10 separate APs ($1000), with 10 cable runs ($1000) and a single switch ($200) and installation ($1000), I'm sure that most managers would opt for the quicker solution that has less disruption.
They are all directional. In the 16 channel version, the 802.11a channels are directed at 30 degrees to the previous one, and each has a 60 degree spread. That should extend the range a bit - even if the diameter of the total covered area only doubled over using a single AP with an undirected antenna, that is still 4x the area covered. If the diameter of the wireless range was 3x larger, that is 9x the area covered. 4x - 16x more area.
Anyone here know what range increase is more likely with a solution like this?
Well, ignoring the fact that multiple clients can connect to the same AP, if you are in an office that doesn't have a wired infrastructure, or it needs upgrading*, then the cost of getting someone to rewire and patch could be quite high, especially if there are 100 people on the network (e.g., an office). 10000ft** of cat5e might not cost too much on its own, but the installation costs will cost a lot more, as would 8 decent 24-port GigE switches. And then all the laptop people will still moan about needing wireless access.
And think about having one of these at a convention or trade show... very handy.
* yes, I know that if the network 'needs' upgrading then there is probably a bandwidth need.
** yes, you can install switches at each block of desks to reduce cable runs. And so on.
I hadn't thought about that, I had noticed the number was quite large though. Nice for you to get a 1.5% battery boost :)
ACPI is part of IOKit on Mac OS X, so you have to use ioreg to access the data as far as I am aware.
Thanks.
You've had 226 recharge cycles on the battery, and the capacity is under 3000mAh now, instead of the original 4200. You've lost around 1250mAh @ 12V over the 18 months.
Did you run that with the external power in though? I only get 12.4V when it is plugged in.
Whether you want another battery is up to you though. Is the battery life getting to be an issue?
What I've got at the moment is a program that outputs to CSV so you can plot all the variables over time in Excel, OpenOffice, etc.
Still, nice to know that someone else wanted the same sort of thing too. I'm not up to date on Cocoa programming though, maybe it'll make an interesting first application.
I thought that Bulldog had a lot of issues as well?
I didn't take up NTL's offer, they just upgraded me eventually. I'm still being billed at the 600k rate though, and I'm not going to tell them.
I tried it smartass. I gave up and used the Code pull down option in the end.
One day virii will sign up for Everquest or WoW accounts automatically, and fight each other there. One day you will be marvelling at your +10 Sword Of Damocles and a horde of frickin' Win32 virii will come along and kill you for it.
Worse, though, is that normal people will notice the EQ or WoW icon on their desktop, and also get trapped in the game.
Oz Broadband is anything over 128kbs.(ISDN) Laughable yes.
:(
The important thing about broadband is the always-on status. Now 128kbps is a bit naff, but I reckon lots of people would be happy with always on 256kbps.
Of course I'm typing this in the UK on a 2Mbit connection that will be upgraded to 10Mbit within the next year apparently. Sadly the 10Mbit upgrade will coincide with bandwidth limits (75GB/30GB/5GB or thereabouts, for the different price ranges offered).
The fact that my cable connection was down for a week because of a 'weak power level' is neither here nor there
This new offering is best described as a mini DSLAM with a ~2.3Mbit backhaul. So even two users could potentially max it out.
And normal end-user DSL has a contention ratio of 50:1, and business DSL 20:1. The 2.3Mbit/8 users seems quite good to me.
I can't fix the sed problem, but if you remove the \ after the && it gets rid of one problem.
I posted a perl program to do the same thing below though.
Yeah, I'm also running Adium, Apache, Tomcat and Postgresql. In intensive times (running Eclipse J2EE view and Running a web app on the tomcat server it can chug a bit. But it still runs fine mostly, and I've got a 1GB SODIMM in the post somewhere which should get rid of the final issues.
sed: 2: "/| *{/,/| *}/ {
...": bad flag in substitute command: '/'
...
/g;
Maybe I should have bought that sed and awk book
#!/usr/bin/perl
my $info = `/usr/sbin/ioreg -p IODeviceTree -n "battery" -w 0`;
my $batteryinfo = $info;
$batteryinfo =~ s/\n//g;
$batteryinfo =~ s/^.*\"(IOBatteryInfo)\" = \(\{(.*)\}\).*$/$1\n$2/g;
$batteryinfo =~ s/\"([\w ]*)\"=/\t$1:
$batteryinfo =~ s/,/\n/g;
print $batteryinfo . "\n\n";
Does the trick too though, and is easily modifiable to log the fields too. It outputs in the format:
IOBatteryInfo
Capacity: 4400
Amperage: 18446744073709550638
Cycle Count: 9
Current: 3262
Voltage: 11655
Flags: 4
AbsoluteMaxCapacity: 4400
God, do I have to type in loads of standard english text here to get it to submit? Bah! Well, here I am, stuck at home waiting for a delivery of a hard drive and drive enclosure. I'm sitting on my iBook wondering when it will turn up. I should be at work, but I can get away with not turning up as I can work from home. Foo foo foo foo. Is that a van I can hear? It appears not, no, wait, yes it is! Hurrah, a parcel! Fun fun fun fun. Gosh, I wonder if this is enough text.
No, it is not enough text. Sheesh, how frustrating. For a site for geeks, it is remarkably frustrating to post geeky stuff.
I'm just going to add logging to the script above, and then I can do what I said I'd do above.
I have 512MB in my iBook, and I never noticed issues when running Dashboard, Mail, Safari, Terminal, etc, at the same time. Hell even running Eclipse it wasn't too bad, except waking up from sleep.
What I have done though is turn off Dashboard, and I'm going to write an application to log the battery power using ioreg (from a post above) from a full charge, then compare it to running with Dashboard from a full charge.
The new iBooks also use the scrolling trackpad, so I imagine that it will be a problem for them as well?
My new iBook says it has 4 hours and 40 minutes of battery currently (just removed the power cord from a full charge). This is less than the 6 hours I expected of it, although 4.7 hours is still pretty good. I wonder if it would increase if I installed SideTrack?
Exactly. It just works, without getting in the way. The OS and apps have that extra bit of polish and pizzazz to make them special. The OS provides everything you need to interact with the hardware too, no crappy third party DVD burning apps, for example.
...
Nothing I used to like more as a teenager than a night on the A1200 with DPaint 4.5 and Blitz Basic 2 creating yet another silly game, or even sometimes nearly serious software. I was late for school more than once the next day
They had to expect it to happen, if they weren't then they're extremely naïve.
I'd love Mac OS X on Intel PCs. I don't care about getting a manky cheap-black-plastic laptop booting it, but a decent cheap desktop PC, yeah. As you get older you realise certain things - (1) I ain't got the time to get Gentoo to compile, (2) No way am I gonna lose my Unix shell, (3) Nor have I got the time to work out how certain things in Linux/FreeBSD now work since the last release I tried. Mac OS X is the OS for the productive geek, and the amount of desire there is for a generic x86 version shows that many many other people out there think the same thing.
And yes, I have a nice new 1.33GHz iBook here. 'Tis weird, but I'm more productive using it than any computer previous to this one until my old Amiga. It is my first ever Mac too. Used to hate the little buggers, nasty OS, crappy keyboards, boring interface.
With things like JOGL, JOAL, etc, cross platform Java games are becoming a real option I believe. Sure, they aren't going to be up to the standards of the latest greatest 100 man yeaer computer games, but that's probably only because they haven't had 100 man years of work spent on them. With OpenGL and OpenAL, and various other technologies doing all the work, the language you write the game logic in is becoming less important.
The Light Weight Java Games Library is also a nice thing, especially as it is planned that it will be running on devices such as PDAs and phones with the next generation of mobile 3D graphics processors.
And, oddly enough, graphics creation is getting a lot easier for the smaller game development team now because instead of putting leads of effort into designing great textures, you can develop a lot of simple textures (normal map, bump map, texture map, reflectance map, etc) which is a lot easier to do. That, and pixel shaders, object instantiation, etc...
Low end: 209.99 United Kingdom Pounds = 380.016 United States Dollars
I suppose that is only $323 when you take the VAT off though. Only $23 more than the US.
High end: 279.99 United Kingdom Pounds = 506.648 United States Dollars
which is $431 once VAT is removed.
It seems to have worked in the UK however. It isn't ideal, but apparently broadband coverage is 97% of the population. Unbundling lines isn't working great, but the system has been changed recently and should mean higher uptake in the future.
Gas and Electricity are done in the same way over here, with a wholesale network provider, and the service providers all use the same (pipelines|grid) to supply power, with their own billing structure and extras on top.
This method does mean that there is still no competition in the wholesale area, then again I'd prefer that to 2 or 3 times the number of electricity pylons and/or roadworks!
My Ethical Issues in Computing class required almost $200 worth of text books. None were the same from the previous semester, and none were reused the next
Maybe there should be an 'Ethical Issues In Publishing' or 'Ethical Issues In Teaching' course then.
$200 for such a minor course? Fucking ridiculous. Have a course book and a homework book/printout, one to be reused year on year, and the other to be handed out at lectures or whatever you have in your universities.
Computing Ethics does not change drastically every year, or every decade. Anyone teaching a course on ethics with $200 course books each year that can't be reused is a complete and utter hypocrite.
What's up with your student union anyway? Maybe they're in the pocket of the publishers as well.
Should be given an automatic fail for their retardedness.
That way, they'll save money on the next few years of education.
And why are textbooks in the US so expensive? Are they custom made for each course or something? Someone mentioned them having homework questions in! So the college is too half-assed to be able to set its own? God, my opinion of the US education system went down even more. Are students just another profit group over there, used by the short-sighted ruling corporate classes who don't realise that students with $50000 debts aren't going to be buying things later on for quite some time?
When I was at university, the text books were pretty much standardised, and cost at most £30, with the occasional (but not required) book reaching £50 or so. Book costs were quite low therefore, the lecture notes that were handed out were good enough if you attended the lectures and actually did some work to understand the course. Then there were the damaged book stores, second hand book stores, and slightly-out-of-date stores that meant you could get pretty decent reasonable books for £5 or so.
I mean, there are some textbooks which are literally essential to own and which cost a lot. However these books are going to be used for years to come by the owner, if they stay in that field. They certainly don't have 'Course 2006 Homework Questions' in them.
In fact on the page there are screenshots using a 3D engine. However he doesn't want to use one for reasons he also explained on the page. He wants to explore something different, and who's to stop him?
Some of the screenshots are very arty actually, especially the spotlit CAR on minimalist road.
Now could he utilise the GPU to perform and render the 2D operations? I'm sure the bezier mathematics for the 2D renderer could be programmed somehow, but that would mean a lot of effort.
Me? I want to write 2D platform games a lá rick dangerous using a 3D engine. Classic 2D gameplay, with scaling of graphics (textures, of course) and some real depth effects and lighting effects too. Also a good way to play with pixel shaders, normal maps, bump maps, etc, which should make graphics creation a lot more simple. I hope to spend an hour or two a day on this soon, probably starting off with something simple (remake of Amstrad CPC Roland on the Ropes).
Also you might want to look up the addresses of the University of Cambridge Computer Lab (Xen) and Microsoft Research UK. I bet that XP doesn't run on Xen for marketing reasons, not because it hasn't been ported.