PtP Link 65 km and at least 48 mb/s

zildzic · Wed Mar 14, 2007 12:49 am

Hi mikrotik community

How to get this PtP link? Two tower , high 50-60m?
RB532, mini ITX, or PC based ? R52 or SR5 or something else?
Dual Nstream ? DualPol Antennas or 2 antennas pro side ?
Is it posible to have this troughput stable? Costs are not so important as stability of link.
Any suggestion ?? Any experience ??

believewireless · Wed Mar 14, 2007 1:25 am

Go with 3 or 4 ft antennas at either end with SR5s and you'll have a -60dBm signal which should give you 54Mbps connection as long as your noise floor is in the -80s. It should work with 50 meter towers but higher is better.

NStreme-dual would be good if you want faster bandwidth or need symmetrical bandwidth.

zildzic · Wed Mar 14, 2007 3:24 am

What Hardware should I use? RB 532 or something stronger ??
PC hardware is dificult to use in tower

maybe some mini ITX board??
is pacwireless Dish 32,5 dBi good enough ?

believewireless · Wed Mar 14, 2007 5:07 am

How much speed do you need? 532s will work fine up to about 22Mbps.

marksx · Wed Mar 14, 2007 1:07 pm

i can provide you with this thing:

it's PC based solution, fully outdoor, powered from 24V DC source
CPU is 1000MHz with heat on 25W level (there's option with 677MHz procesor with 15W TDP)
The performance is:

and the maximum packet per second throughput is:

The rest are antennas...

jdejansb · Wed Mar 14, 2007 3:42 pm

i can provide you with this thing:

it's PC based solution, fully outdoor, powered from 24V DC source
CPU is 1000MHz with heat on 25W level (there's option with 677MHz procesor with 15W TDP)
...

I really like this!

Have you built custom housing? Could you give more specs (motherboard, flash mem. in hdd slot ... ??)

Dejan

marksx · Wed Mar 14, 2007 7:13 pm

I was waiting for the new, more powerfull routerboards and after some time i decided to build my own "router board"
I've used old pentium 3 processor, because of very high performance with mikrotik software, and ultra low heat generation.
For example router with pentium III 1000MHz can do the same like pentium IV 2200MHz, but P3 generates 25W of heat and P4 generate even more than 60W

The rest are:
memory 256MB
Flash -> PQI DoM 128MB with MT license l4+
4x mPCI - PCI adapters
4x Atheros 5213 (classic sparklan/tonze or SR-5)
Aluminium enclosure IP 67 protection standard (full waterproof)
DC-> ATX converter 120W
4x u.FL -> Nf pigtails (ultra low loss)
Plus 24V 120W Power supply

The motherboard is based on i815 chipset, contain one Intel Pro 10/100 Ethernet, 5PCI slots (with configuration 4PCI + 1Ethernet is working without IRQ conflicts)

zildzic · Thu Mar 15, 2007 12:05 am

I need this box only for PtP link. thats mean 1 or two mini PCI . Only question now is to use nstream or not.
your work seams to be very good solution for me. send me your offer

marksx · Thu Mar 15, 2007 12:46 am

nstreme dual is better on long range links, but you will need very big antennas to get good signal on 65km
good signal = good speed (even real 70Mbps full duplex)
bad signal = bad speed (sometimes hard to get 10Mbps full duplex)

i suggest you even pair of 150cm parabolic dish and SR-5 cards
and there'll be still problem with these 50Mbps of real throughput...

we have feeders, but dish you will need to buy yourself
you can write to our sales guy, he'll make you an offer
his email is p.luczkowski@cyberbajt.com

PS. If you can divide this link into two links, 35km is not big deal

yakcora · Thu Mar 15, 2007 7:36 am

How about the PC104 boards does MT support pc104 boards?

Why MT Doesn't support Via SBC's? they are great in specs...

Thu Mar 15, 2007 9:05 am

routeros does support them, at least the x86 ones

firebat · Thu Mar 15, 2007 10:12 am

I was waiting for the new, more powerfull routerboards and after some time i decided to build my own "router board"
I've used old pentium 3 processor, because of very high performance with mikrotik software, and ultra low heat generation.
For example router with pentium III 1000MHz can do the same like pentium IV 2200MHz, but P3 generates 25W of heat and P4 generate even more than 60W

The rest are:
memory 256MB
Flash -> PQI DoM 128MB with MT license l4+
4x mPCI - PCI adapters
4x Atheros 5213 (classic sparklan/tonze or SR-5)
Aluminium enclosure IP 67 protection standard (full waterproof)
DC-> ATX converter 120W
4x u.FL -> Nf pigtails (ultra low loss)
Plus 24V 120W Power supply

The motherboard is based on i815 chipset, contain one Intel Pro 10/100 Ethernet, 5PCI slots (with configuration 4PCI + 1Ethernet is working without IRQ conflicts)

What kind of throughput are you seeing with the PIII?

marksx · Thu Mar 15, 2007 12:39 pm

throughput in what kind of applicatinon ?
Wireless ?
Ethernet router ?
Firewall ?

Why MT Doesn't support Via SBC's? they are great in specs...

X86 versions are working, but via + mikrotik = problems and of course performance will be disasster (you will need to share interrupts within one PCI slot)
Via is good for car PC, when 1000MHz Via Eden CPU sholud be enough to play 196Kbps MP3 - or even that would be not enough

Pentium 3 design is smillar to intel mobile solutions or core platform.
The slowest core2duo has 1.83GHz, if we assume that core2duo will have 1GHz and only one core (like new pentium L) pentium 3 should have the same performance = great performance.

Qusay · Fri Mar 16, 2007 1:24 am

Sorry, but can I ask marksx something about the speed he reached;
Did you use the hall 4 cards to reach this speed? Or just normal Nstreme-Dual, i.e only two wireless pci cards?

obm1 · Wed Mar 21, 2007 12:41 pm

hi jdejansb

i want to ask you some questions

q1.
can i have the diagram for this device so i can build it

q2.
can i use it stand alone or i have to connect to another access point

q3.
can i use it for point to multipoint

janisk · Wed Mar 21, 2007 1:47 pm

A2: you use it standalone as every router that has wireless card and ROS installed with lvl 4 license has AP capabilities

A3:

instead of antennas suggested in this thread use sector antennas

tgrand · Wed Mar 21, 2007 2:41 pm

It's just a mother board with processor and memory!!
Get yourself a WaterTight Enclosure (of anykind) and mount your motherboard into it and pick up your prefered power supply.
Add Batteries if you wish. Perhaps Some Solar panels, and a wind generator.

If your box is not metal, then you really should line it with metal foil of some sort and ground the foil. Be sure and add sheilding to your pigtails.

Shield, shield, and more shield.

marksx · Wed Mar 21, 2007 9:05 pm

Sorry, but can I ask marksx something about the speed he reached;
Did you use the hall 4 cards to reach this speed? Or just normal Nstreme-Dual, i.e only two wireless pci cards?

You don't need to apologize

This is speed of ONE nstreme dual (two cards per site, one for TX, one for RX) with turbo mode enabled (40MHz) on 54Mbps (effective 108) QAM-64 3/4

can i use it stand alone or i have to connect to another access point

this is one device, you'll need two ofcourse because you have two ends of link

can i use it for point to multipoint

Nstreme Dual is only point-to-point solution, to have multipoint i suggest using classic nstreme

It's just a mother board with processor and memory!!

basicly yes, but i know only 5 models of motherboards that are suitable with MT with 4 wireless cards on different IRQ's & 100Mbps intel lan

mipland · Wed Mar 21, 2007 9:50 pm

It's just a mother board with processor and memory!!
basicly yes, but i know only 5 models of motherboards that are suitable with MT with 4 wireless cards on different IRQ's & 100Mbps intel lan

Please, can you write a list of that board? If this is against the forum's policies, can you send me a PM?
Thanks

marksx · Thu Mar 22, 2007 12:14 am

Intel 865 GBF (L) /w LAN - 5 mPCI + integrated 10/100 lan
Siemens d1218 4mPCI + integrated 10/100 LAN
Siemens d1219 4mPCI + integrated 10/100 LAN
Gigabyte (i don't remeber model, 5PCI and one 1000Mbps lan for lga775 intel 865 based)
SuperMicro board (i dont remember model)

Others have problem with IRQ, sometimes you'll just place 2 cards and you have irq conflict.
With irq problems, you won't be able to do such performance (as shown before)

tgrand · Thu Mar 22, 2007 4:56 am

You can force low priority devices onto IRQ which are shared thereby freeing up IRQs. Disable Sound for example. Or disable video and run headless. There are many things that can be done to free up IRQs.
Have your LPT port share an IRQ (What do you need a printer port for on a Router) or diable it all together.

etc. etc.

marksx · Thu Mar 22, 2007 2:44 pm

and still many many many boards don' have option to fully disable USB, etc
or to manualy setup IRQ's.
Even if they have, very often you can notice that these settings are not working, because very often these settins are low level ones, and mikrotik often overrides/enables them with his own.

Besides current computer motherboard don't have many PCI slots, it's even hard to find 3PCI motherboard today.
So if you have good model of motherboard which you are 100% sure that this board is working without any IRQ conflicts with 5 devices (4 radios + lan)
Please just write model - of course i'm looking for board which is possible to buy (contry doesn't matter)
PS. And of course with price lower tan 150USD / motherboard

onowojemma · Mon Mar 26, 2007 4:31 am

I love the board how much does it go for and does it has minpci slot by default or you construct it on it.

0ldman · Mon Mar 26, 2007 5:58 pm

I have a simple question.

How do you keep from having to climb the tower to turn this puppy on after power issues?

I was thinking of taking an unused pair in the Cat5, making a jumper to the power switch pins and taking them to the ground.

Most PC's have the BIOS option to power on after power failure (yes, I know battery backup, but stuff still happens) but it often doesn't work if the voltage spikes or drops too low, which happens frequently around here.

marksx · Mon Mar 26, 2007 6:06 pm

this motherboard has "always on" bios setting, so as long as there's power motherboard will function.
Of course there's another method - connect PS_ON pin to GROUND (Green wire to Black wire), i often make it through 100OHmm Resistor and everything is working fine
There should be email to my frient Przemek which is our international sales, so if you want to buy, contact him.

Diganet · Mon Mar 26, 2007 7:11 pm

Can we feed this system via PoE? We would need to be able to use 60m Ethernet. We can however use all 4 pairs if we have to..

/Henrik

marksx · Mon Mar 26, 2007 7:42 pm

No, because PC will consume even 2-3A (1,2A idle) of current, so CAT.5 cable is too thin to provide PoE on this distance, you'll need something more thick.
On 60m with 24V AC-DC adapter on one site and DC-DC converter (wchich works from 18,5) on the other you should use minimum AWG 12 <3mm^2> wire (AWG 10 suggested <5mm^2>)

and i'm not sure, i'm using these on shorter distances (30 meters with 1,5mm^2 is fine)

0ldman · Mon Mar 26, 2007 8:10 pm

this motherboard has "always on" bios setting, so as long as there's power motherboard will function.
Of course there's another method - connect PS_ON pin to GROUND (Green wire to Black wire), i often make it through 100OHmm Resistor and everything is working fine
There should be email to my frient Przemek which is our international sales, so if you want to buy, contact him.

if you go that route, won't the system just power on, then turn off in five seconds?

marksx · Mon Mar 26, 2007 11:22 pm

won't the system just power on, then turn off in five seconds?

No, PS-ON + GND trick is method which forecefully puts power to motherboard from power supply, all motherboards i know are working with this.

bushy · Tue Mar 27, 2007 3:10 am

I have a simple question.

How do you keep from having to climb the tower to turn this puppy on after power issues?

I was thinking of taking an unused pair in the Cat5, making a jumper to the power switch pins and taking them to the ground.

If you need a reset or power switch at the bottom of the tower and have a spare pair on the cat5 , use a small electronic relay and wire its contacts across the reset/power switch . To reset it just feed power up the spare pair.

Qusay · Fri Mar 30, 2007 3:15 am

Hi Normis, hi every one:
does M.T O.S V.3 supports this miniboard?
http://www.mini-box.com/Jetway-Versa-J7 ... ategory=99 or any of the below "same processor type"
http://www.mini-box.com/VoomPC-Enclosur ... ategory=87

marksx · Fri Mar 30, 2007 3:55 am

it should work, but better find commell ones with intel CPU, they're more powerfull, and often offers integrated DC-DC coverter.
I'm going to have samples in next few days, so if you want i can post some results on board.

Qusay · Sat Mar 31, 2007 2:17 am

marksx,
That would be great!!!!
I'll wait for your test results. Just inform us when you finished and good luck...

0ldman · Sat Mar 31, 2007 7:44 am

won't the system just power on, then turn off in five seconds?
No, PS-ON + GND trick is method which forecefully puts power to motherboard from power supply, all motherboards i know are working with this.

See if I understand you right, ground the positive power pin? or something power supply related?

0ldman · Sat Mar 31, 2007 7:50 am

Nevermind, found it on Google.

I thought originally you meant to short the PS switch pins on the mobo, which will power cycle the machine after 5 seconds.

Learn something new every day... at least on good days.

luka5z · Sat Mar 31, 2007 8:15 pm

Anyone try this mobo, any IRQ problem?

IBM 6578 on Intel 815
Does PIII 1000MHz on Siemens d1219 with 4mPCI + integrated LAN pass the exam with 2x NS2 ?

marksx · Sat Mar 31, 2007 9:07 pm

integrated LAN pass the exam with 2x NS2

I haven't found board which will take two duals on their max performance at the same time, so you can use two instead

luka5z · Sat Mar 31, 2007 10:16 pm

Supposing I'll try something powerful that PIII, something like PIV 2GHz or 3GHz to try 2x NS2 on one mobo. It wont work like 2x mobo with 1x NS2 on each ? Any possibility to make 2xNS2 on one board and dont kill the CPU ?

marksx · Sat Mar 31, 2007 10:24 pm

in this case problem isn't CPU, it's motherboard itself (and method which atheros uses to comunicate with CPU)
Of course this will run, but you won't be able to passthrough trafic on the level as high as mentioned before (south&northbridge will stuck and this won't pass traffic, even with CPU on 30%...)

luka5z · Sat Mar 31, 2007 11:46 pm

ok, thanks
So it is better to buy 2x mobo with 3xPCI mATX then, if that will be only point2point 2xNS2. Using NS2 on mobo with 5xPCI, 3PCI will be unused... eh, to many metal boxes.
It is possible to use bonding with 2xNS2 and how ?

luiguidue · Sun Apr 01, 2007 6:52 am

I have a link of 67Km whith RB112 and SR5 on 1,2 m parabolic dish 36dB .
the link have Nstrem exact sise
and throughput is no good ....

the better signal is -57dBm

Luis

luiguidue · Sun Apr 01, 2007 7:04 am

I have a link of 67Km whith RB112 and SR5 on 1,2 m parabolic dish 36dB .
the link have Nstrem exact sise
and throughput is no good ....

the better signal is -57dBm

Luis

Maximun throughput 3.9 Mbit in one direction and 800 Kbps in both direcction....???
why ?

Luis

luka5z · Sun Apr 01, 2007 3:38 pm

#marksx

Where can I buy cover placed on that foto?

ilius168 · Sat Apr 14, 2007 6:52 am

HI Marksx,

Where can i get dc-dc converter for the unit?

Are you feeding the unit using 2 wires (+ and -) from the AC-DC 120W converters?

I'm currently running AC powers to the tower (30m high).

Performs well though

Thx.

marksx · Sat Apr 14, 2007 1:35 pm

http://www.cyberbajt.com/cyber.php?get=produkt,1745

it's very good converter, because of very big variety of DC input voltages (from 18 to 28V) and stable work even close to maximum 120W

In this case you can put 24V DC instead of 110/230AC, but you will need to calculate cable diameter to ensure that voltage drop will be as low as possible - 30m is not problem AWG 14-16 should be enough.
Still, we are always trying to mount 230V near devices, but not directly to them (if possible), so we have one central box with switch (in most cases) and there we have AC/DC power supplies (PoE, etc) sometimes we're putting UPS there (if there's enough space) some ethernet lighting protection, etc.
To this box we are connecting other wireless devices, sometimes with PoE, sometimes with individial DC power cable

ilius168 · Sat Apr 14, 2007 5:43 pm

Hi marxs,
nice DC Converters there, but again, how do we feed the 24DC??

btw, this is how i build my pc based MT, with standard AC powersupply (120W) inside an custom build acrylic box. though i find that it's not such a good idea to have AC up on the tower and it generates quite a high heat within the box.

marksx · Sat Apr 14, 2007 6:22 pm

we have AC/DC power supply too

http://www.cyberbajt.com/cyber.php?get=produkt,1741

so all you need is to mount a box (can be plastic) on the bottom of the tower with this AC/DC power supply, place wire from bottom to top and connect PC through DC/DC converter to this wire.

I strongly suggest to use aluminum case (or any other metal) with PC setups.

sdrenner · Thu May 03, 2007 8:16 pm

i can provide you with this thing:

it's PC based solution, fully outdoor, powered from 24V DC source
CPU is 1000MHz with heat on 25W level (there's option with 677MHz procesor with 15W TDP)
The performance is:

and the maximum packet per second throughput is:

The rest are antennas...

I assume your in Turbo mode? what frequency's are you using? And how about a screen shot in TCP mode instead of UDP

jo2jo · Fri May 04, 2007 2:16 am

wooo..good point!

didnt even notice that..

yea we need TCP numbers..not UDP.

EDIT: btw, those are very impressive PP/s and UDP numbers!! nice!

EDIT: yea i now PP/s is redundant..but redundant is good right?

marksx · Fri May 04, 2007 7:57 am

I'm putting raw( which means without any comment - just screens) test data here, so if you're interested in some of test resulsts i got, you can browse here:

http://www.marx.kebab.org.pl/testy/

as you can see nstreme dual wasn't so bad in one direction uwing TCP:

and symetrical ~70Mbps in full duplex, which means that ACK's were eating our bandwidth - yeah TCP is very bad protocol for high speed connection tests - of course there are many high speed TCP implementations for testing purposes, but more often ppl use UDP instead.

And yes turbo was enabled - there isn't any option to get more performance from creepy atheros QAM 64 3/4 :/

starwing · Fri May 04, 2007 4:43 pm

i can provide you with this thing:

it's PC based solution, fully outdoor, powered from 24V DC source
CPU is 1000MHz with heat on 25W level (there's option with 677MHz procesor with 15W TDP)
The performance is:

and the maximum packet per second throughput is:

The rest are antennas...

One of my main concern of using a PC Mobo in an outdoor setup is the use of mechanical fan. Imagine having the box at the top of 150feet tower , would be a bit awkward to have to change the fan when it died.

Any other fanless mobo solution out there?

sdrenner · Fri May 04, 2007 5:21 pm

Still very cool.
Can you tell use what kind of PC you are using with this link? (CPU, Ram, motherboard) What Radio card? (SR5, CM9) Etc..

Thanks a bunch.

marksx · Fri May 04, 2007 6:38 pm

Pentium3 is suitable to work _without_ fan if you won't threat procesor with 100% load, 1GHz has only ~25W! TDP, if somebody want we can always put 677MHz one (which is TDP 15W rated)
plus something like this for cooling:

This monster isn't even going warm with p3

starwing · Sat May 05, 2007 11:13 pm

Marksx,
Have you tried Celeron CPU? Is their performance on par with the P3?
What do you think of this board: http://www.commell.com.tw/product/SBC/LE-370Z.HTM

I see that your cooling device still have a mechanical fan. Do you know if it's stable with only the heatsink but not the fan?[/url]

marksx · Sun May 06, 2007 12:42 am

Have you tried Celeron CPU? Is their performance on par with the P3?

This depend on aplication, but 600MHz celeron mobile (without any cache) compared to 600MHz old pentium3 (with 256KB cache) should be little slower.

What do you think of this board: http://www.commell.com.tw/product/SBC/LE-370Z.HTM

too expensive, slow, only one mPCI, needs stable 12V (no chance to power over ethernet, even longer cabling would be problematic)

I see that your cooling device still have a mechanical fan. Do you know if it's stable with only the heatsink but not the fan?

probably, this depends on which heatsink&processor you will use.
With this monster mentioned before, even 1GHz p3 should work stable without fan, with this small thing

1GHz CPU @ 20-30% load there shouldn't be any problems too, but higher load can be problematic.
I suggest to use two fans if you're frightened with only one which can fail, but industrial grade PAPST fans for example are more confident than this whole electronic stuff...

fefo2006 · Sun May 13, 2007 5:39 pm

Hi, i have a pentium 3 450 mhz with direct ac supply. And i want to know :
1. ubiquiti xr5 600 mw or ubiqui sr5 400 mw work with minipci adtapter on pci standard.
2. what wireless card do you use in you pentium 3?
Thanks....

fefo2006 · Sun May 13, 2007 5:40 pm

Have you tried Celeron CPU? Is their performance on par with the P3?
This depend on aplication, but 600MHz celeron mobile (without any cache) compared to 600MHz old pentium3 (with 256KB cache) should be little slower.

What do you think of this board: http://www.commell.com.tw/product/SBC/LE-370Z.HTM
too expensive, slow, only one mPCI, needs stable 12V (no chance to power over ethernet, even longer cabling would be problematic)

I see that your cooling device still have a mechanical fan. Do you know if it's stable with only the heatsink but not the fan?
probably, this depends on which heatsink&processor you will use.
With this monster mentioned before, even 1GHz p3 should work stable without fan, with this small thing 1GHz CPU @ 20-30% load there shouldn't be any problems too, but higher load can be problematic.
I suggest to use two fans if you're frightened with only one which can fail, but industrial grade PAPST fans for example are more confident than this whole electronic stuff...

i, i have a pentium 3 450 mhz with direct ac supply. And i want to know :
1. ubiquiti xr5 600 mw or ubiqui sr5 400 mw work with minipci adtapter on pci standard.
2. what wireless card do you use in you pentium 3?
Thanks....

marksx · Mon May 14, 2007 7:27 am

i, i have a pentium 3 450 mhz with direct ac supply. And i want to know :
1. ubiquiti xr5 600 mw or ubiqui sr5 400 mw work with minipci adtapter on pci standard.

depends on motherboard...

2. what wireless card do you use in you pentium 3?

This one:
http://www.cyberbajt.com/cyber.php?get=produkt,1383

or this:

http://www.cyberbajt.com/cyber.php?get=produkt,1718

VicNet · Tue May 15, 2007 6:33 pm

Hello,

marksx i have problem.

We test
MB : INTEL D915GEV EATONVILLE
P4 3.0Ghz
Mem : 512 MB
Hdd : Kingston CF 1GB
PCI : RB14, 2 * D-link DFE 538TX Fast Ethernet PCI 10/100 Mbps
Mikrotik 2.9.43

and we have 5 Mbit full duplex

terible performance on testing pc<->router on P4-3.0Ghz<->pc

There are not any packet marking firewall rules, only simply routing from one ether1 interface to another ether2 interface.

Do you have any idea what is going on.

sdrenner · Tue May 15, 2007 6:39 pm

What radios? Channels? Freq? etc..

VicNet · Tue May 15, 2007 6:54 pm

we don't use any radios at this time. no wireless.

We test only on wire.

marksx · Tue May 15, 2007 8:16 pm

The DFE-530TX has a via-rhine chipset while the DFE-538TX has a realtek 8139 - which isn't recomended for high performance networks - it's only enduser chip.
First change NIC's to Intel 10/100 ones or 1000 ones
http://www.intel.com/network/connectivi ... dapter.htm

or even these ones (as long as your MB supports pci-e)
http://www.intel.com/network/connectivi ... dapter.htm
or
http://www.intel.com/network/connectivi ... dapter.htm
but i'm no sure that you MT supports these ones (probably yes)

fefo2006 · Thu May 17, 2007 12:31 am

What motherboard model you use?
the chipset is intel 815 but the model?
intel 810 are similar to 815?
Thanks

fefo2006 · Thu May 17, 2007 5:18 am

What do you think about Mother asus a7v8x-x + Athlon xp 2800 ?
It work better with mikrotik and xr5 + atheros than a mother pentium 3 450 mhz with chip intel 810
What of there have more stability with a flash ide, intel810 or a7v8x-x?

tgrand · Thu May 17, 2007 3:10 pm

Go into the BIOS and disable any and all devices which are not in use.

For example: Disable all USB controllers, as I doubt you are using them.
If you are not using the Parrallel port, then disable it.
Same goes for the secondary IDE, etc, etc.

As far as Network cards, be sure the network card is in the supported list, as an unsupported card WILL have a HUGE impact on the entire system, including wireless.

nick52 · Mon Jun 04, 2007 1:23 pm

Hi Marksx,
the PC dissipation is about 25 W: this means that the temperature inside the enclosure could be very high as it is placed outdoor.

Do you think this high temperature could be a problem for the electronic components?

In the same way, do you see problems at the startup when the temperature is low (-20 °C)?

thanks

marksx · Mon Jun 04, 2007 3:55 pm

25W is maximum, and this box is rather big, so there shouldn't be any problem regarding temperature.
But -20* is rather cold so you should think about some heater, the best should be one with microprocesor - you can program it when the heater start

nick52 · Mon Jun 04, 2007 8:59 pm

Sorry Marksx, I have another question.
With the PC that you propose what is the switching performance in term of pps (packets per second) for the following packet lengths: 64, 250, 550 and 1500 bytes? You may use two Ethernet interfaces in your PC and conncect them at two PCs where run Iperf.

nick52 · Thu Jun 07, 2007 1:46 pm

Hi Marksx,
you said:
"it's PC based solution, fully outdoor, powered from 24V DC source
CPU is 1000MHz with heat on 25W level (there's option with 677MHz procesor with 15W TDP)"

and

"... PC will consume even 2-3A (1,2A idle) of current, so CAT.5 cable is too thin to provide PoE on this distance, ...... "

I think that the maximum power dissipation inside the enclosure is 3A * 24 V = 72 W. Why do you state 25W only of heat?

marksx · Thu Jun 07, 2007 9:40 pm

With the PC that you propose what is the switching performance in term of pps (packets per second) for the following packet lengths: 64, 250, 550 and 1500 bytes?

50bytes UDP packets -> 100kpps -> ~40Mbps
100bytes and more = atheros maximum throughput ~80Mbps

I don't have time to play with iperf, since this is plenty for me

I wrote that 25W is TDP (Thermal Design Power) of CPU, CPU isn't the only thing that consumes power in PC - isn't that logical ?
Only CPU (in normal conditions) is vulnerable to temperature, so cooling this component is crucial, other aren't (don't forget that board is old i815), as long as we're below 90*C mark
Of course durability of that motherboard @ 80-90*C will be wery short, but this base station was invented for central europe climate, which has temperatures from -30 to +45

phendry · Tue Oct 16, 2007 5:24 pm

it should work, but better find commell ones with intel CPU, they're more powerfull, and often offers integrated DC-DC coverter.
I'm going to have samples in next few days, so if you want i can post some results on board.

Did you ever get these in to test?

doush · Wed Oct 17, 2007 12:07 am

The point is not only the throughput in x86 systems, I guess..

It is important how much Volts per PCI slot motherboard supplies ?

I think it should be more than 5V ...
or for XR series even 6.5V I guess...

Is there any board that supports these V rates per PCI slot?

0ldman · Wed Oct 17, 2007 9:58 am

I don't think its the volts, its the amperage.

Can't answer that, just trying to help point the question in the right direction. I don't know of a board that puts more than 5v to a PCI slot, and I think as of PCI 2.2 voltage is 3.3v anyway.

doush · Wed Oct 17, 2007 8:47 pm

(OK.. this time without giving URLs )

its the Watts that differ since I had a recent search in google..

At least 6.5W is required for XR series per PCI slot.. and relatively 5W or below for others dependign on mW of the mpci..

Do u guys know any PC board which supplies that much Watts per PCI slot ?

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