802.11 B Peak Power?

Hello
I was looking at the Cisco's 871w specification earlier. I noticed that it has a peak power of 245mW with the average of 80mW for the 802.11B.
What does the "peak" really mean? There is no where in the 871W CLI that will allow me to increase the power all the way to 245mw. I can only increase it to 20dbm/80mW.
Thanks.

Peak power is the maximum level of work or energy output that is measured during an observation period. You can use these command show environment power all to know more about power consumption by device. Peak power of 245mW is the max. peak power for Cisco's 871w and 80mW is default avarage power.

Similar Messages

Where can i find a Labview driver for the "8990a PEAK POWER ANALYZER" it's not on NI's site.

where can i find a Labview driver for the "8990a PEAK POWER ANALYZER" it's not on NI's site.
if there is no driver maybe you can tell me the closest instrument that comes to this one from the list at,
http://search.ni.com/query.html?lk=1&col=alldocs&nh=500&rf=3&ql=&pw=595&qp=%2BContentType%3AInstrumentDriver+%2BIDNetManufacturer%3A%22Hewlett-Packard%22&qt=peak+power+analyzer&layout=IDNet
so i could modify and use the driver

Hello,
It looks like Agilent/HP makes the 8990A, but I was not able to find a driver for it that we or Agilent has written for this device.
Since I am not familiar with the 8990A, I cannot recommend which drivers might be similar, but you are pointed in the right direction. Agilent themselves might know more about which models use similar command sets so that you can modify a driver easily.
Hope this helps.
Scott B.
Applications Engineer
National Instruments

Peak Power Scheduler does not save

I have a T420 and Power Manager 6.55 installed.
Because my notebook is almost always working on the dockstation, it keeps charging all the time.
Not good.
So I decided to use the Peak Power Scheduler to use the battery at least once per day. But everytime I try to schedule a Peak Power Scheduler (no matter the configured schedule settings), after I close the Power Manager window and open again the schedule disappears.
This does not occur with other schedule options (like screen time, power management options, etc.).
Any idea?

It sounds to me that the two power managers are conflicting with each other. Try to make your custom power settings inside of the Lenovo Power Manager.
You can do this by opening the Lenovo Power manager and selecting the power plan tab, directly under the tab is a button that says New. When you select this a new window should open to allow you customize your own power schemes. You will be able to customize the System settings such as: Maximum CPU speed, Display Brightness, Graphics Power plan, also desired Idle timers, events, alarms an other advanced settings. Once created you will see your new power plan listed under the default power plans.
If this does not work, I would then suggest uninstalling the Lenovo Power Manager and utilize Microsoft Power Manager.
Good luck! Let me know if you have any questions
Thank you for being a part of the Lenovo Family,
Catie
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Peak Power and System power

I was trying to evaluate the difference between the Creative Inspire T5400 and the newer T5900 5.1 speaker systems. At first I was led to believe that the *only* difference is that they have placed the centre speaker on it's side for the newer T5900's, as all RMS ratings are the same for both sets at 74w RMS (22w sub, 4x 8w sats and 20w central). However, I noticed this difference in the discription on the Creative US site: For the earlier T5400 set, they say 74w RMS with 5w 'Total System Power'......and for the T5900 set, they say: 74w RMS with 48w 'Peak Power'. So what is the story here? 'Peak Power' I understand, as this is twice the total RMS wattage (2 x 74w = 48w). But what is this 5w 'Total System Power' of the T5400's? Where has this figure come from? And what is the difference here....is one set more powerful than the other? If so, which is it's I bought the T5900's thinking they were better in some way other than the new horizontal positioning of the centre speaker - but I could have gotten the T5400's a tad cheaper. I hope this new horizontal centre speaker is not some gimmick to mask a downgrade of some kind - as it's widely known Creative has been making succesful attempts to lower it's manufacturing costs. Anyone know the score here?
Confoooooozed!:smileyindifferent:

I wouldn't worry about it - if I had the T5400's, I would not consider 'upgrading' to T5900 as they are more or less the same speaker system. The center speaker is on it's side - that is all. If anything, your T5400's will be made to a superior standard - Creative are known to have been cutting manufacturing costs recently.
I was immensly dissapointed to find no gold connectors on my T5900's, but my old, supposedly 'inferior' Inspire 5300's do have gold connectors. Also, the speaker cables on my T5900's are very thin - unlike the cables on my old, 'inferior' Inspire 5300's. This is very bad on Creative's part and I hope they realize that I will not automatically turn to them when I next need audio equiptment. They should be making their products better each time, not cutting their own costs in the interests of corperate greed. If the moderators on this forum don't encourage this kind of talk - I would ask them to take note of this: Some things will not go un-questioned by their loyal customers. I have spent hundreds of pounds on their goods and so I have a right to speak up about their customer unfriendly practises.
Of course, if you want to upgrade - go for a 6.1 or 7.1 system...or really push the boat out and buy the Gigaworks - which are made to a very good standard! Also, to be fair to Creative again, I can highly reccomend the DDTS-100 decoder - I got mine recently and I'm more than happy with it. It's a great thing to accompany any of their 5.1, 6.1 or 7.1 systems.
Regards.

RFSG Peak vs Average Power

I'm using a PXIe-5673E to generate multitone signals, and am currently adding the ability to pulse the output using script generation in RFSG.
The problem is that when the 5673 is set to script, the power level type needs to be set to peak power. Everything in this application has been done so far using average power, so I can't simply switch it now. I have to calculate the equivalent peak power when creating a pulsed output.
I've used the examples RFSG Multitone - Arbitrary Spacing.vi and RFSG Pulsed Data.vi to do this, so I'm dealing with I-Q arrays and the power level calculated inside of rfsg_Complex Multitone II.vi.
I've tried the calculation in the RFSG help manual under power level type, but it's always giving me 0. I've also tried the calculation on this page but it seems to be giving me a value that's too high. With a tone power of -40 dBm, it's returning -27 dBm. I'm looking at the output on a scope, and I'd assume the peak voltage level should be the same with or without pulsing the output.
What am I missing? Any help would be greatly appreciated.

Hi Marc_A,
There are several differences between peak power and average power, I think it's worth addressing several of them here. To summarize the notes below, you'll likely just need to divide your I/Q data by sqrt(2). I've added a couple of other notes about switching from average power to peak power that may be helpful but are only applicable in specific cases.
The help documentation is very confusing on this; it required a fair amount of time to pull this information out. When in average power mode, the I/Q data is scaled from -1 to 1, while in peak power mode, the peak power is scaled from -1 to 1. Peak power is given by sqrt(I^2+Q^2), meaning that if your I/Q data is scaled from -1 to 1, your peak peak power will be scaled from 0 to sqrt(2). To compensate, you'll need to divide your I/Q data by sqrt(2); I've attached a VI that does both peak and average power for arbitrary waveforms. This VI isn't built on script mode, but it should show how to manipulate your I/Q data to compensate for peak mode.
One thing to be wary of with average power vs. peak power; when in average power mode, the driver will scale I/Q data from whatever range it is in to the -1 to 1 range. For example, in average power mode, if my I/Q data is scaled from -1 to 1 and I set the power level to be -20 dBm, my signal's maximum output will be -20 dBm. Also, if my I/Q data is in the -0.5 to 0.5 range and the power level to be -20 dBm, the driver will still assume we want a maximum power of -20 dBm and scale my I/Q data by a factor of 2; I will still see -20 dBm as my output. Average power always sets your signal to the power level requested and scales the I/Q data to match.
This is not the case with the peak power case. With peak power, the driver does not scale the peak power to -1 to 1 for you, it instead leaves it the way it is. If you're coming from the average power case, this problem can manifest itself in three ways:
Lower than expected power levels. If your I/Q data is scaled from -0.5 to 0.5 and specify a power level of -20 dBm, you'll get a lower than expected power level, around 6 dB lower.
Error being thrown if the highest magnitude of your I/Q data is greater than 1. If we forget to divide by sqrt(2), this will likely occur. Average power mode will allow you to specify any range you want (even -100 to 100), but peak power will not allow you to select anything greater than a peak power of 1.
Unexpected power levels if using multiple waveforms. In average power mode, if the waveforms have different ranges, the driver will match them all to the specified power level. Therefore, in average power mode, all of our waveforms will have the same power level unless we change the power setting as well. However, in peak power mode, if the waveforms have different ranges, they will be different power levels since the driver does not scale to the -1 to 1 range.
To summarize: as long as your I/Q data is scaled from -1 to 1, all you need to do is divide it all by sqrt(2). The last 3 notes are caveats only if your data wasn’t scaled from -1 to 1 originally.
Thanks,
David Bell
National Instruments
Applications Engineer
Attachments:
Peak Power Compensation.vi ‏35 KB

Mac Pro 8-Core AC Power Requirements

I am in the US (120 VAC) and am wondering if anyone has more details concerning the amperage usage on these units. Apple tech specs show only a MAXIMUM of 12 amps when running in the Low range (120 VAC). I am assuming that the maximum of 12A is during startup draw and possibly under heavy load conditions. But, is there a "normal" draw?
The reason I am asking is that in the next 60 days, I will be replacing 18 PPC G5 units with the MP 8-Core units, and there will be a period of time that I will be required to run both units (due to software and workflow issues).
In most newer wiring scenarios, the breakers are rated for either 20 or 25 amps, and will trip at an 80% load.
I've got LCD's (minimal amp requirements), so I'm trying to determine how many units per circuit I can have running without tripping breakers.
Any advice would be greatly appreciated.
Thanks
Chris

I have an 8-core (Nehalem) Mac Pro with 14 GB of RAM and two internal drives. The measurements cited here are observed on the information display of an APC Back-UPS XS 1500 that has an additional 20" Apple Cinema Display plugged into the (measured) backed-up outlets of the UPS.
This Mac has a second display but it is not connected to the backed-up outlet of the UPS and therefore not measured, but there could be extra power draw by the GPU because of it.
The measurements are taken with the line voltage at about 119 volts RMS.
When booting, there is a large instantaneous in-rush that showed over 400 watts, but it is just for the blink of an eye, so I wouldn't trust what the XS-1500 tells me. The in-rush current is non-trivial, though. I had to change to the XS-1500 UPS because an RS-900 UPS that I had earlier used with a dual core G5 PowerMac, which this MacPro replaced, did not have enough capacity to allow this Mac Pro to boot.
During booting, the peak power draw is about 205 watts. The XS-1500 may not see spikes in the power draw, so the actual peaks may be a bit higher than 205 watts.
After booting and when idle (no active apps), the power draw is about 170 watts.
When put to sleep, the Mac Pro and the display together runs about 14 watts.
I have written a (antenna design) program that uses Grand Central Dispatch and it can push Activity Monitor past 800% (I have seen it go up to 1200% on this mere 8 core machine, so I am not sure how much you can trust Activity Monitor either). In that condition, the power draw is 270 watts.
All in all, the Mac Pro is quite power efficient, but you may want to stagger the booting of your 18 machines just in case the in-rush is too great.
That being said, there is an unresolved bug as of 10.6.2 (you can find it in a different Mac Pro thread here) that causes power consumption to bump up to 240 watts (on my machine) whenever Core Audio is actively running. This jump in power occurs even when you play music in iTunes and occurs even when I use a couple of external USB or FireWire Sound Cards that I have (including the Griffin RadioShark and an external USB speaker). A couple of apps that I have written uses Core Audio -- and I can tell that the jump in power happens the instant you start causing Core Audio to issue callbacks.
Kok Chen

Giving power to a Gigabyte R9 280x OC 3G

My machine is a Mac Pro (early 2008) with 32 GB RAM, 1 SSD, 1 SATA, 1 Optical Drive, 2 X 2.8Ghz Quad Core Xeon
My main worry is if I can give enough power to this GPU, so there is no danger harming my PSU, or even Motherboard.
Techpowerup gives a peak power consumption of 244W and a maximum of 347W
http://www.techpowerup.com/mobile/re...80X_OC/24.html
I have looked in every corner of the Internet for one of the 5.25 bay PSUs but couldn't find any, especially for shipping to Greece. I don't want to use an external hacked PSU. I don't like that kind of mesh on my desk.
So, my next approach to get power is the following:
1. Get 150W from the two PCIe connectors with a 2x 6 pin to 8 pin cable.
2. Get additional 100W from SATA bays with a 2 x SATA to 6 pin cable.
3. And finally we have the 75W that the PCIe bus provides.
Total: 325W
So, my questions are:
1. Are my calculations/ assumptions correct? Does the above connectivity provides 325W of power to the GPU?
2. If 1 == true, then am I on the safe side using this card for Photoshop, After Effects, Final Cut and Cinema 4D work, without worrying about frying the motherboard of my 2008 Mac Pro (3,1)?
3. If I absolutely need an additional PSU, because my assumptions are wrong, where can I find one?
Thanks so much for your time and brain cells!

I use to have the name of a German, Italian and European major online PC vendor.
Here in USA Newegg and Amazon have those 450W PSU that will fit, they have 2 x 8-pin and 2 x 6-pin and designed to power GPUs.
I think you should look on MacPro forum for Mac Pro
http://forums.macrumors.com/showthread.php?t=1803996
GPUs with AUX Power Supply (cMP 2010) ( 1 2 3)
2 x GTX580 or 2 x GTX680 in Mac Pro 2010? ( 1 2)
it takes a 6 and an 8 pin. I don't recommend running off of molex power but it certainly works. Try to use molex from different rails.
100W from SATA bay? Not that high and just which ones? the two optical drive bays? surely not the backplane for drive bays 0-3
EVGA also sells GPUs with molex adapters and they also do not recommend it.
POWER can be TRICKY
Each GTX 570, 680, and 770 requires two power feeds (and the Mac Pro only provides two total). To run a second 'fat' GPU, we used an external ATX 500W power supply. The lower optical bay of the Mac Pro can be used to provide a third power source. MacVidCards recommends a Booster X5 auxiliary power supply that fits neatly in the lower optical bay.
http://www.barefeats.com/gpu680v6.html
Will you have any other GPU? and with this, you won't see early video until the drivers load and the system gets to login point.
Also, the 2008 just does not fare well in performance, the older PCIe 2.0 bus holds back any and all GPUs which will do much better in a 2010-2012 system. Probably a big improvement nonetheless over what you are using.
A couple test results from Barefeats:
May 10th, 2013 -- Do the newest GPUs run faster on the 2010 Mac Pro than on the 2009 and 2008 Mac Pro?
April 26th, 2013 -- PART THREE: EVGA GeForce GTX 680 Mac Edition versus the 'Sharks' (insane GPUs like the GeForce GTX 580 Classified and GTX 690)
April 18th, 2013 -- PART TWO: EVGA GeForce GTX 680 "Mac Edition" Versus Past and Present Mac GPUs running Pro Apps
April 16th, 2013 -- PART ONE: EVGA GeForce GTX 680 "Mac Edition" versus Past and Present Mac GPUs running OpenGL accelerated Games and Benchmarks
April 5th, 2013 (Appended) -- SHOOTOUT WITH THE 'SHARKS': Sapphire Radeon HD 7950 for Mac versus "big fish" GPUs (Added full results for the Quadro K5000 and a flashed Radeon HD 7970.)

Access point without enough power

My AIR-LAP1252G-E-K9 access point doesn't register against the controller. The switch is seeing both the MAC and the IP of the AP, but the power inline seems not to be enough. Although the switch sees the AP's IP address by CDP, this one doesn't answer the ping request.
Device ID: SFJ2AP2
Entry address(es):
IP address: 10.20.147.226
Platform: cisco AIR-LAP1252G-E-K9 , Capabilities: Trans-Bridge IGMP
Interface: GigabitEthernet1/0/7, Port ID (outgoing port): GigabitEthernet0
Holdtime : 125 sec
Version :
Cisco IOS Software, C1250 Software (C1250-K9W7-M), Version 12.4(10b)JA3, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Wed 19-Mar-08 18:56 by prod_rel_team
advertisement version: 2
Duplex: full
Power drawn: 11.000 Watts
Power request id: 63976, Power management id: 2
Power request levels are:11000 0 0 0 0
Management address(es):
Is this a hardware problem? What could be the source of it?
Thanks in advanced for your ideas!
Best regards,
Laura

Hi Laura,
Yes, it's most cetainly a "PoE" problem;
Powering the Aironet 1250 Series Access Point with 802.3af Power over Ethernet
The Aironet 1250 Series Access Point with one RM1252 radio module installed requires 12.95W, which is within the 802.3af Power over Ethernet (PoE) standard. Any Cisco switch supporting 802.3af may be used to power the Aironet 1250 Series Access Point with one RM1252 radio module installed. This is ideal for businesses that chose to only deploy on a single frequency (2.4 GHz or 5 GHz). A single radio provides optimum performance with approximately 300 Mbps maximum PHY data rate. Customers who deploy dual-band, 802.11n radios and power the 1250 Series using standard 802.3af will have more reliable and predictable coverage than that provided by traditional 802.11a/g networks; however, operation will be limited to a single transmitter per radio with maximum PHY data rates of 150 Mbps instead of 300 Mbps per radio. Customers with a significant investment in 802.11 a/b/g client devices that have low-to-medium bandwidth needs but high-reliability requirements will benefit the most from this type of deployment scenario.
Powering the Aironet 1250 Series Access Point with Cisco Enhanced PoE
Cisco Enhanced PoE was designed for customers who want to install new PoE-enabled technologies that require greater than 15.4W per port to function at full capability, such as wireless technology based on the IEEE 802.11n standard. Cisco Enhanced PoE provides the full power requirements for dual-radio modules and eliminates the need to run an additional cabling drop or insert a separate power injector. Support for Enhanced PoE is currently available on a variety of Cisco CatalystÂ® switching platforms. For more information on Enhanced PoE, visit
http://www.cisco.com/en/US/prod/switches/epoe.html.
What are you using for the 1252's?? If you are using an "E" Series 3750 this is a very good thread;
http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless - Mobility&topic=General&topicID=.ee6e8b8&fromOutline=&CommCmd=MB?cmd=display_location&location=.2cc039db
Hope this helps!
Rob

Power Injector

what is the part number for the power ijector for the Aironet 521.

Hi Rafael,
This one should work for the AP 521;
IEEE 802.3af - Cisco Aironet Power Injector
(AIR-PWRINJ3)
Hope this helps!
Rob

Will this power supply be enought for a KM2M Combo-L Machine

Will the following work with a 145 Watt Power supply?
Basically I've got an Enlight Case I would like to use but it only has a 145 Watt Power supply.
- MSI Motherboard for AMD processors Model KM2M Combo-L
Chipset:VIA® ProSavageDDR KM266
FSB:200/266MHz
RAM:Supports four memory banks using two 184-pin DDR DIMMs or two 168-pin SDRAM DIMMs Max 2GB
IDE:Ultra DMA 66/100/133 Up to 4 Devices
Slots:1x AGP (AGP 2.0 2x/4x ) and 3 PCI 32 Bit
Ports:1xFDD,1xCOM,1xLPT,2xPS2,VGA,LAN and Audio Ports
Onboard LAN:6103 PHY 10/100 Mbs
Onboard VGA: ProSavage8 2D/3D Graphic
Onboard Audio: Realtek ALC 650
- AMD Athlon XP 1700+ Thoroughbred /266 FSB Processor CPU 1700+/ 1.47GHz
AXDA1700
CPU: 1.47 GHz
Type: 1700 XP Thoroughbred
Cache: 256K
BUS: 266MHz
Micron: .13
Socket A
- CRUCIAL MICRON 256MB 32x64 PC 2100 DDR RAM
184-Pin, CL=2.5-Unbuffered 2.5V, 6-Layers
- Maxtor 40GB 7200RPM Hard Drive Model
Size: 40 Gigabytes
Interface: IDE ULTRA ATA133
Seek time: RPM:7200
Cache 2MB
- Microsoft Multimedia Keyboard & Wheel Mouse
- Aceex V.92 Full Duplex FaxModem PCI Voice, Data, Fax Modem 56000bps Modem
- Cyberdrive 40x16x48 CDRW CD-RW Drive CW078
Buffer: 2MB
Read Speed: 48x for closed sessions.16x for open sessions. Maximum 40x for audio extraction
Write Speed 4x, 8x,12x, 16x, 20x (CLV) and 20x, 24x, 28x, 32x, 36x, 40x (ZCLV) for CD-R media. 4x, 8x, 12x and 16x CLV for CD-RW media
Access Time: 100 ms typical for random access, 100 ms typical for 1/3 stroke
Power Supply: DC +5V ?5%, DC +12V ?10%
Interface:Enhanced IDE (E-IDE)
MTBF > 100,000 POH (25% duty, seek and read)
CPU FAN|HAC-V81 BASE COPPER AMD/INTEL)
Supported Socket type: Socket A, 370, 462 Processors:
Intel P3 Cumine up to 1.13GHz, Celeron (tualatin up to 1.6Ghz)
AMD Duron up to 1.7GHz, all Athlons up to 2600+
Fan Dimension 80 x 80 x 25 mm
Rated Speed 2500 ~ 4800 RPM
Air Flow 31.4 ~ 62.8 CFM
Rated Voltage 12 VDC
Heat Sink Dimension 80 x 69 x 45 mm

Depending on what company made the PS, most companies over exagerate what they will do, or give a peak power output instead of a constant rated amprage. If thier PS will maintain a constant 200watt under full load, then it will get the job done in a all-in-1 unit. Check this page for power consumption of all your parts. It`s kinda old and the values for the VC and processors could be a bit higher, but it will give you a good idea.

2940 RX Power Input

I see that the maximum power input to the USRP-2940 RX ports is -15 dBm.
Is that the average power rating?
Is there a peak power rating?
Thanks.

There is not a specefication for peak power input of this USRP. However it is advised to stay beneath -15dBm.
Matt P.
Applications Engineer
National Instruments

HP- power supply atx 400

Dear
Kindly, we have HP-Desktop the fan for power supply not work, power supply model is ATX MODEL P-400WATT, and
i bought new power supply with 500watt.
i don't know if will causes problems for computer or not bcz new power supply higher watt than old one?, need your technical support
There is no label on computer case to know his model, but by commands line bcz Linux OS i got following info, i hope this will help you:-
SMBIOS 2.7 present.
Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer:
Product Name:
Version:
Serial Number:
[edited Serial Number by Moderator]
Wake-up Type: Power Switch
SKU Number: To be filled by O.E.M.
Family: To be filled by O.E.M.
Handle 0x001F, DMI type 12, 5 bytes
System Configuration Options
Option 1: To Be Filled By O.E.M.
Handle 0x0021, DMI type 32, 20 bytes
System Boot Information
Status: No errors detected
This question was solved.
View Solution.

Faziz, welcome to the forum.
Since I don't know the model of the computer I can't review the specifications. However, if the power supply unit (PSU) fits into the computer, it will not cause any problems. The computer will only use the amount of wattage that is required to run it properly. The extra wattage will be used for peak power needs. So, it is alright to use the PSU in the computer.
Please click the "Thumbs up + button" if I have helped you and click "Accept as Solution" if your problem is solved.
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RMS terminology and power comparison standards

I am doing my research in order to find the best of the best 2.1 speaker system for my PC. I already have an AUDIGY 2 SE soundcard and I would like to support it with an excellent sound output set. While comparing different speaker systems I have came up with the following two best of the best products: Creative I-Trigue L3800 (Price 99GBP) and Logitech Z-2300 (Price 91GBP). Even if these are the best of the best it seems that they have a serious difference of power between them. Here is the RMS speaker power specifications:
1.Creative I-Trigue L3800: 9 Watts RMS per channel (2 channels) 30 Watts RMS subwoofer 2.Logitech Z-2300: Total RMS power: 200 watts RMS Satellites: 80 watts RMS (40 watts x 2)
Subwoofer: 20 watts RMS Total peak power: 400 watts
My conclusion from the above data is that Logitech Speakers are 4 times more powerful from those of Creative (200 watts compared to 48 watts). Is my above conclusion correct? What else do I have to compare in order to buy the best system?

Clearly the " RMS " is the standard.
They do clarify their goofy ratings
in small print on some pages.
Those LT's you mention are great deal.
Very similar but in a revered brand - KLIPSCH -
a similar system is available for about $30. more.
That 'THX' certification is supposedly a big deal.
Big plus with the L3800 is remote controls functions
on Zen Vision M.
good luck

Car charging with a power inverter question.

So i have this power inverter that says 200w continuous/ 400w peak power.
its from QuantumFX PWR80
input voltage 12V DC
output voltage 110+/- 10V AC
USB output 5V DC (max 1000mA)
Continus output 200W
peak output 400w
output freq. 60+/- hz
low volt. protection 9.2-9.8V DC
over volt. protection15-16.5V DC
overload Protection >240W
I have the newest macbook pro 15" 2.2 ghz qua core i7
will this work fine with my mac? or is eit too much power or too little idk haha please help a fellow mac user.

I use inverters extensively and have found that getting a good inverter is not that easy; here are some issues to think about:
1. you need to have an inverter that supplies enough continuous power (not just peaking power) to your device. So if you have a 17" MacBook Pro, like I have, you need an inverter that continuously supplies at least 85 watts of power. One that only supplies more than 85 watts peak power is not good enough.
2. you need to have an inverter that is large enough in size to dissipate energy efficiently. Some inverters that theoretically supply enough continuous power still heat up, and then go into an off/on cycle to keep the temperature down. Trouble is, every time the inverter cycles off, the computer screen dims; which is really annoying.
3. many of the smaller inverters use a fan to keep them cool. Trouble is, most of the fans are noisy- which is also annoying. Also, when the fan turns on, they draw more current, which causes the power to vary, which may affect your screen brightness.
4. inverters should have a cord- otherwise, they are sometimes difficult to stick into a cigarette lighter plug.
I have not found a really good inverter yet- if someone does, please let me know. A good inverter would have the following characteristics:
1. provides enough continuous power to keep the computer charged and running.
2. dissipates energy efficiently with metal fins so that it doesn't need to go into an on/off cycle to keep the temperature low enough. If the inverter must go into an on/off cycle, your computer screen will dim every time the inverter is off- which is distracting.
3. doesn't have a noisy fan that also draws power and cycles on/off, and therefore is also distracting.
4. has a high efficiency (you should buy one with at least 85% efficiency; most of them do).
5. has a cord, as opposed to a rigid plug that is pushed into your cigarette lighter.
6. is as small in size as possible, and as inexpensive as possible- but without compromising the basic need to supply continuous, steady power without having the screen dim or building up too much heat.
There are two basic types of inverters: ones that supply pure sine wave power, and ones that supply modified sine wave power. The pure sine wave inverters supply "smoother" power (more steady voltage)- but are much more expensive, and, I understand, not needed for powering computers.

3G on X201

Hello everyone.
Does the X201 ThinkPad support 3G (as in a SIM-card)? Under "network", it says:
56K / Gigabit Lan / WiFi agn / Bluetooth / WWAN Ready
It's pretty crucial to me that it does include support for 3G before I buy, since I'll be using internet away from WiFi on a daily basis. Thanks!

Oh, I see. I can't find any Ericsson modems in my country, but I did find a Vodafone modem that costs half of the Gobi 2000, but only from one reseller. I'm not sure it'll work though, if not there really doesn't seem to be anything cheaper than the Gobi 2000. I don't even know if it has 3G, but it says GSM, so I figured that might include 3G.
Here's the product description from the Vodafone HSPA (no Windows 7 or X201):
Vodafone HSPA Embedded Mobile Broadband Option
43R1821
features:
Connection speeds of up to 3.6 Mbps make it 32 times faster than a dial-up connection
Conforms to IEEE 802.11b WLAN standard, operating in the 2.4 GHz frequency range
Receive sensitivity is -94 to -82 dBm
64-bit Wired Equivalent Privacy data encryption
Automatic rate selection
Transmitter output power is 32 mW
Peak power consumption is 9mA in standby, 185mA Rx, 285mA Tx
Warranty
1 year – Customer Replaceable Unit (CRU)
Hardware compatibility
ThinkPad T61 6457 98G, 98M ThinkPad T61 8895 6WG, 6WM ThinkPad X300 6478 1JG, 1JM, 1VG, 1VM ThinkPad X61 7666 36G, 36M ThinkPad X61 7675 4NG, 4NM ThinkPad X61 Tablet 7762 54G, 54M
Software requirements
The Vodafone HSPA Embedded Mobile Broadband Option is compatible with:
Microsoft Windows XP
Microsoft Windows Vista
Note: Some configurations may not be compatible.

802.11 B Peak Power?

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