Power consumption with dual power supply

Hi,
I need to know how dual power supply works, I mean, when you have two power supplies in a router if both of them are working at the same time, or if one of them is working while the other one only begin to work when the first one stops.
And if both of them are working at the same time, what is the power consumption, the same as if only one of them was working?
Thanks

marianares0001 wrote:Hi,I need to know how dual power supply works, I mean, when you have two power supplies in a router if both of them are working at the same time, or if one of them is working while the other one only begin to work when the first one stops.And if both of them are working at the same time, what is the power consumption, the same as if only one of them was working?Thanks
The implementation details can potentially differ per product category but usually the following is applicable:
The product provides configurable power redundancy modes and choosing a mode dictates whether load will be shared across supplies or whether a particular supply will be dedicated for redundancy.
If both (or more) supplies are working at the same time then both share the power load.
The actual power consumption depends on the power required to run the installed components and is the same whether you use power supplies in redundant or power sharing mode.
Atif

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Battery consumption in power supply operation

Hello there.
i have a Problem with my MacBook Pro 15 i5 using Windows 7 with Bootcamp:
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3750X, Dual Power Supply, 1 in 110V and 1 in 208V

I have a Cisco WS-C3750X-12S swith with dual C3KX-PWR-350WAC power supplies that are both currently connected to 110V PDUs. We are being forced to migrate over to new 208V PDUs and I would like to know if it is possible to run this switch with one power supply connected to a 110V feed and the other power supply connected to a 208V feed?
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Hello,
That should be fine, I've seen customers actually run this in production for quite some time. You should be able to migrate this without downtime as long as you are not running a large number of POE devices that are reliant on XX amount of power at one time.
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CiscoWorks how many switches in stack + dual Power supply usage

Hi,
Please tell me that is it possible to see in CiscoWorks that device with dual power supplies is using both or just one. e.g 6500
Also I need to count the total number of physical switches in the company but I am only able to generate a inventory report that only shows logical devices, but it do not show if the switch is stack then how many physical switches are in stack.
Is it also possible to count the total number of physical devices in the company instead of just logical devices.
I am using the
LMS: 1.2.0
RME: 4.3.0
CS:    3.3.0
CM:   5.2.1
DFM: 3.2.0
Thanks.

Thanks for reply.
In the detailed device view I am able to see that switch has 2 power supply, but but unable to see that its using either only one or both. But I understand your point that if its not visible here then its not possible.
Explainantion of my second query: My company want to know that how many physical switches has been installed. We manage over 2500 logical switches in the company and management want to have a report showing that how many total physical switches exist.
Is it possible to generate a report which shows that each logical switch contains how many physical swithes and/ or total number of physical switches in the company.
e.g MLS001 (logical switch) contains sw1 (physical switch), sw2 (physical switch), sw3 (physical switch), sw4 (physical switch)
     MLS002 (logical switch) contains sw1 (physical switch), sw2 (physical switch)
CiscoWorks generate a report shows that 6 physical switches exist.
Please reply ASAP. Thanks

1.8Ghz & Dual 2.0Ghz Logic Boards/Power Supply

I have a perfectly fine working 1.8ghz G5. I also have a dual 2.0Ghz G5. However, the dual doesn't power up. I'm pretty sure it's the power supply. But, I'm not positive.
My question is. Is it possible to put the dual 2.0 logic board into my 1.8ghz machine? The inside of the cases look very similar. Or is there a way to test the logic board of the 2.0 before I take everything apart?
Thanks..

The CPU speed of a PowerMac G5 is always 2x the bus speed or less. Thus, with the 900 MHz bus speed of the 1.8 GHz motherboard, your 2.0 GHz CPUs would clock down to 1.8 GHz at best.

Anyone having Power Supply Failures with 4305's

For some reason over the last 6-8 weeks I am getting multiple power failures on my 4305DMPs, replacing the power supply/wall plug brings everything right back but I'm wondering if there is a bigger problem.
All DMP's are connected to APC power bars with Surge Protection, and the LCD Screen continues to work fine. The DMP will just quickly flicker both Red and Green Lights, and remain unresponsive. We have tried cleaning teh contacts on the power supply but have had no luck.
I have had to swap 10-12 of them now, these have been working with no issues in the field for over 3 years.
I guess I am just wondering if anyone else has had this problem, a search on here didn't reveal anything.
Thanks,
Jh

I haven't heard anything about this on the 4305, but just pointing out that this is a 2-year old post.
We're using some Linksys POE -> 5V splitters and they've been humming away for years. I listen to feedback about reliability, but it would be helpful if a specific part # / manufacturer on the brick were identified along with any complaints about it.
As far as replacements, be sure to use the right specifications, other DMPs operate off of 12VDC but the 4305 uses a 5-volt adapter.
Input voltage: 5V
Input current: 3 ADC
Power consumption: Peak: 12W; average: 5W

How do i remove blown power supply (g5 dual 2.7)?

my powermac g5 (dual processor 2.7Ghz) has blown it's power supply and i'm struggling to remove it. I'm at the point where i need 'screwdriver' style allen keys to remove the water cooling system (I hope i'm right in thinking that once this is out i can somehow get the power supply out from the bottom of the case).
with the machine lying down, looking down into the cooling system i can see 6 hex style screws (4 in corners, 2 in middle), 4 star style screws (2 at edges, 2 in the middle).
which ones do i need to undo to lift the entire cooling system off? i don't want to risk damaging the cooling system by unscrewing everything i see.

Thanks for the official procedure, that rivet defiinitly looks like it's meant to break as it is removed. I'll see if i can unhide my email address on my profile for this site and maybe you could email me the file?
My machine didn't have much dust in it at all, and it never had any problems starting, suspending or resuming. It did sound like it was about to take off sometimes when i was loading the processor. I mainly do stuff in Logic and there is always moderate fan noise while i was operarting the program, and then when it came time to bounce the audio out and the processors were at 100% it made a **** of noise. Also got really hot, would heat the room on a cold day no problem. Overall though considering the heat the thing was producing i dont think the fan noise was excessive though. In fact overall i was really pleased with the machine, but after reading around on the internet it probably seems to be the worst piece of hardware that apple have ever designed.
When i spoke to the company who i'm getting the refurbished psu from, they couldn't understand where the blue flashes could have come from. Initially i thought the light must have flashed out of the fans on the power supply but i've sinced realised the fans are on the front not the back - and the flashes definitly came from the back. They suggested maybe i had a dodgy power lead, so now im worried about the board and processors.

Does "dual power supply" mean "redundant power supply"?

Does Cisco7301 "dual power supply" mean "redundant power supply"?
If unplug one power socket, 7301 continues operating?

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On a 7301, I believe it does act as a redundant power supply, and this is often true for many Cisco devices with dual power supplies, but there can be exceptions. For example, on the 6500 chassis, you might use dual power supplies in combined mode, i.e. failure of a power supply would leave the chassis short of necessary power. The 3560X/3750X might also have insufficient power if a power supply fails when running on two (this issue may arise when using PoE).

Cisco 3850 Dual Power Supply - One No Response

Hey Guys,
I am getting multiple switches on my network showing "power supply failure" from Solarwinds.
I am running Cisco 3850s running v 03.02.03.SE cat3k_caa-universalk9 iOS, and they all have dual power supplies. When i do the sh env power, I get this output.
SWITCH1#sh env power
SW PID Serial#     Status Sys Pwr PoE Pwr Watts
1A PWR-C1-715WAC       xxxx OK Good     Good 715
1B PWR-C1-715WAC       xxxx No Response   Good     Good 715
SWITCH2#sh env power
SW PID Serial#     Status           Sys Pwr PoE Pwr Watts
1A PWR-C1-715WAC xxxx   OK Good     Good 715
1B PWR-C1-715WAC xxxx No Response     Good     Good 715
When I physically go down to look at the switches, they have green lights, so they are receiving power, but I keep getting the PSU failure alerts.
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Hi,
I think below Bug could match with your issue.
"power supply B is not responding" reoccurring on Catalyst switches
https://tools.cisco.com/bugsearch/bug/CSCun41735/?reffering_site=dumpcr
And we can see workaround of this issue is HW workaround.
Thanks,
Jack

Quicksilver G4 Dual 1ghz power supply...

I'm pretty sure that the power supply in my Quicksilver G4 Dual 1ghz is going. Initially, I was only getting the familiar bong for startup, but nothing else. I then noted that the fan on the GForce Ti card wasn't spinning, nor the fan on the optical drive. I removed the Ti card, my second hard drive, and two RAM chips; the computer started, then shut down. I pushed the power button, it finally started. The fan on the optical drive is still not spinning (still plugged in though.)
I did buy a new motherboard battery, put it in, and followed the process of resetting the CUDA/PMU. I did that before doing the above so I know the battery is fine.
That's why I'm almost sure it's the power supply.
So, my question is, where and how do I go about purchasing a new power supply for this computer? Any help and/or suggestions would be most appreciated.

Some of the symptoms might desribe a logic boarrd, cpu or Power Supply issue. This article might assist:
http://www.peachpit.com/articles/article.asp?p=420908&seqNum=4&rl=1
If you are extermly confident with a multi meter you might try the following procedure. However, be sure to use appropriate ESD procedures as "static" can kill your machine and be sure to take care as electircal power can kill you.
PS verfication:
1. Power Mac G4 (QuickSilver/QuickSilver 2002) (see Figure 3): Connect the black lead of the volt meter to pin 11 of the 22pin power supply connector. Connect the red lead of the volt meter to pin 22 of the power supply connector. The volt meter should measure approximately +25V. If you do not get a reading of +25V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step. If you do measure +25V on pin 22, the power supply is likely OK. Go to the next step for further verification.
Start up the computer by pressing the power button on the front of the computer. Note: Verify that the power cable is plugged into connector J30. If the computer starts up normally, the power supply is OK. If the computer does not start up, go to the next step.
2. Check to see if the power supply fan is spinning. If it is not, go to the next step.
3. Connect the black lead of the volt meter to pin 16 of the power supply connector for AGP and PCI models or pin 11 for Gigabit Ethernet/Digital Audio/QuickSilver/QuickSilver 2002 models. Connect the red lead of the volt meter to pin 1 of the power supply connector. The volt meter should measure approximately +3.3V.
If you do not get a reading of +3.3V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step.
4. Connect the black lead of the volt meter to pin 16 of the power supply connector for AGP and PCI models or pin 11 for Gigabit Ethernet/DIgital Audio/QuickSilver/QuickSilver 2002 models. Connect the red lead of the volt meter to pin 4 of the power supply connector. The volt meter should measure approximately +5V. If you do not get a reading of +5V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step.
5. Measure the voltage of pin 10 on the power supply connector. The voltage should measure approximately +12V. If you do not get a reading of +12V, re-check the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply; otherwise, go to the next step.
6.The testing is complete. You have just verified that the power supply is not the cause of the “No apparent power” symptom.

Scxi 1520 dual power supply

Greetings!
I am using an SCXI 1520 right now. I wish to get a dual voltage power supply out of it (+/-) 5V. I know that what I get is just 0-10V. But is there a trick to do this. Thank you very much!
-Ham

Hello,
There is no way to get +/- 10 V from the SCXI-1520. I recommend either using an external power supply, or the unused AO channels on your DAQ device to provide these voltages. To make use of the unused AO channels, you can either use a SCXI-1180 Feedthrough panel with a SCXI-1302 terminal block, or a 50-pin ribbon cable connected to a CB-50. Both of these simply give you access to the unused pins on the DAQ device (AI 1..N, AO 0..N, CTR, etc...).
For more information on the SCXI-1180, see:
http://sine.ni.com/apps/we/nioc.vp?cid=1645〈=US
For the CB-50, see:
http://sine.ni.com/apps/we/nioc.vp?cid=4842〈=US
Let me know if you have further questions.
Sincerely,
Sean C.
Applications Engineer
National Instruments

Vi driver for Varian Dual HV power supply

hi, I'm looking for a driver for the Varian Dual and/or Multivac HV power supply.
if anybody has it, please let me know...
thank you
Andrea Milocco

Hi Andrea,
unluckily the instrument driver for your Power Supply is not available on NI site.
You can try to search the driver at link: Search Instrument Driver
Otherwise you could ask information about driver directly to the instrument constructor.
But if you know the commands to talk with instrument and if you are using Labview or Measurement Studio or LabWindows/CVI 7.x you can easily create the communication with the Power Supply through the Instrument Assistant.
Regards.
MarcoC

Power supply in MDD dual 867 shot?

I arrived home today to find that my Dual 867 G4 was powered down, though I had left it on when I left this afternoon. Not only that, but it won't turn on at all - the power button doesn't light up, there's no spinning of the disks, no chime, nothing. I've unplugged and re-plugged the power cord, switched out surge protectors, plugged it directly into the wall socket - no dice. One thing I did notice, though, is that when I plugged the power cord into the back of the G4 after I had disconnected it, I hear a very faint and periodic short noise, maybe every one second, from the back of the G4. Almost like a short buzzing noise, but too quiet and brief to really be called that.
Does this sound like the power supply is shot? Like it's shorted or burnt out in some way? Thankfully I have two iBooks to use in the meantime, but most of my daily used files and such are on the 4 hard drives in the G4, and there's no space for them (particularly my music) on either of these laptops.
If I do need a new powersupply, does anyone have recommendations for sources? It seems sellers on ebay want the sell them for over $100.
Thanks,
Anthony

Hi,
Yes, that does sound like a power supply issue. It could also be a bad CPU card, or even the motherboard. To isolate the problem, I'd take out the power supply and measure the voltages across the different pairs of wires in the plug that feeds the motherboard. If the voltages don't equal what they should, as per the G4 MDD service manual, then you're in the market for a new power supply. And yes, the ones on eBay will go for 100-150 or so. Make sure it's stated to come from a working system. Untested power supplies could be dead ones from a similar dead machines.
If the power supply voltages are OK, then to isolate whether or not the motherboard, or CPU card is bad will require a spare motherboard, or CPU card, to swap with yours.
Sources for new, or rebuilt, power supplies include WeLoveMacs , DVwarehouse, HarCoreMacs , among many others.
Here is a good set of pictures and step-by-step instructions on taking the MDD power supply apart.
In my case, I had a spare motherboard and power supply to test with. The machine, which I got cheap off of eBay because it didn't work, did not turn on at all. Swapping first the Power supply with a good one didn't bring it back to life. Turns out the CPU card and the power supply were both bad. Once both were replaced, the MDD machine has worked fine.
Good luck!
Ed

Dual 867 kernel panic problems, is it Power supply?

My 4 year ish old dual 867 is acting weird. Started when i installed leopard (prob coincidence though) the other week. It started kernel panicking every night as i normally leave it on, but also any time i left it alone for half an hour. If i left it writing a dvd overnight it wouldnt crash.
I installed on an other drive and didnt install anything but it still crashed, it took 3 attempts to get it to install from the cd as it crashed the first two (kernel panics).
I took it to the only mac store on the island. Very friendly but couldnt reproduce even one crash. Had it for 36 hours, ran tests, no probs, left it on for a while, no crash.
In talking to them it came up that it could be the power cable as id posted on another site the crash log and someone said it was the power supply as hed had the same.
The shop disagreed, but lent me a new cable. No crashes for 3 days. Solved!
Then i installed new ram to try to speed up football manager. Back to crashing every 20 mins. Checked the ram was in okay, and ran remer, memory was fine. Crashing stopped being regular but still intermittent. The guy on the other forum is adamant its the power supply from the crash log but i cant see what says that.
The monitor is an apple adc lcd monitor which has two usb ports that stopped working about 2 months ago.
This is one of the crash logs
Wed Nov 7 18:16:05 2007
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x000000000000005C PC=0x0000000016DA6140
Latest crash info for cpu 0:
Exception state (sv=0x12dd5c80)
PC=0x16DA6140; MSR=0x00009030; DAR=0x0000005C; DSISR=0x40000000; LR=0x16DA613C; R1=0x12F27C40; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x16DA613C 0x177351C4 0x00346AFC 0x0034ED1C 0x003484A4 0x003547BC
0x00354E58 0x000AFE54
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBHub(3.0.3)@0x1772f000->0x1773cfff
dependency: com.apple.iokit.IOUSBFamily(3.0.3)@0x16d94000
com.apple.iokit.IOUSBFamily(3.0.3)@0x16d94000->0x16dc8fff
Proceeding back via exception chain:
Exception state (sv=0x12dd5c80)
previously dumped as "Latest" state. skipping...
Exception state (sv=0xc27a00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9A581
Kernel version:
Darwin Kernel Version 9.0.0: Tue Oct 9 21:37:58 PDT 2007; root:xnu-1228~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x0009AD18 0x0009B6BC 0x00029DC4 0x000AEA90 0x000B22F8
Proceeding back via exception chain:
Exception state (sv=0x12dd5c80)
PC=0x16DA6140; MSR=0x00009030; DAR=0x0000005C; DSISR=0x40000000; LR=0x16DA613C; R1=0x12F27C40; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x16DA613C 0x177351C4 0x00346AFC 0x0034ED1C 0x003484A4 0x003547BC
0x00354E58 0x000AFE54
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBHub(3.0.3)@0x1772f000->0x1773cfff
dependency: com.apple.iokit.IOUSBFamily(3.0.3)@0x16d94000
com.apple.iokit.IOUSBFamily(3.0.3)@0x16d94000->0x16dc8fff
Exception state (sv=0xc27a00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task

Sun Nov 18 22:12:05 2007
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x000000000000005C PC=0x00000000005E1140
Latest crash info for cpu 0:
Exception state (sv=0x24521000)
PC=0x005E1140; MSR=0x00009030; DAR=0x0000005C; DSISR=0x40000000; LR=0x005E113C; R1=0x24603C40; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x005E113C 0x009AF1C4 0x00346ADC 0x0034ECFC 0x00348484 0x00354DAC
0x00354E60 0x000AFE54
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBHub(3.0.3)@0x9a9000->0x9b6fff
dependency: com.apple.iokit.IOUSBFamily(3.0.3)@0x5cf000
com.apple.iokit.IOUSBFamily(3.0.3)@0x5cf000->0x603fff
Proceeding back via exception chain:
Exception state (sv=0x24521000)
previously dumped as "Latest" state. skipping...
Exception state (sv=0xc1e780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9B18
Kernel version:
Darwin Kernel Version 9.1.0: Wed Oct 31 17:48:21 PDT 2007; root:xnu-1228.0.2~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x0009AD18 0x0009B6BC 0x00029DC4 0x000AEA90 0x000B22F8
Proceeding back via exception chain:
Exception state (sv=0x24521000)
PC=0x005E1140; MSR=0x00009030; DAR=0x0000005C; DSISR=0x40000000; LR=0x005E113C; R1=0x24603C40; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x005E113C 0x009AF1C4 0x00346ADC 0x0034ECFC 0x00348484 0x00354DAC
0x00354E60 0x000AFE54
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBHub(3.0.3)@0x9a9000->0x9b6fff
dependency: com.apple.iokit.IOUSBFamily(3.0.3)@0x5cf000
com.apple.iokit.IOUSBFamily(3.0.3)@0x5cf000->0x603fff
Exception state (sv=0xc1e780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task

G5 Powermac Dual Core Power Supply Issue

My G5 Dual Core 2.3 GHz was working fine till this morning when at about 6:00 AM the power supply started making a bunch of noise. Luckily I was at home not at work so I pulled the plug...waited a while, powered on again, saw the apple logo and decided to turn it off till I get it fixed.
This is the third G5 I have with power supply issues. The first one was a dual processor that hums when doing a lot of networking or when attaching USB flash drives...so apparently there was a extension program on that one. I sold that and switched to the dual core machine, then both of the dual cores had power supply issues. One got replaced under Apple Care. The 3rd one just had the issue happen.
Anybody having bad luck with these? My old G4 DP 1.42 has been running almost flawlessly since it came out (only replaced the main fan for a more powerful and quieter unit).
Have the power supplies for the Dual Core G5 machines been redesigned or should I expect my new one to fail again?

Hi Jack,
I'm sorry. You did note that with your first G5 you knew of the extension program. Too early in the day for me I guess. Personally I haven't sensed from the G5 discussions that Power Supplies have been a major continuing issue, but there certainly have been a lot reported. Usually it's Logic Boards that keep getting fried for one reason or another. Fortunately it doesn't seem to be the most expensive thing to replace, especially if you buy a used one. Maybe someone will chime in who is more observant then I am this morning.
For what it's worth I still have the first Mac I ever bought which is a PM8500. It still runs fine whenever I pull it out from it's dusty storage. By contrast this is my third G5.
Edit: Up early and fasting for a test... I just caught your reference to 3 years. That time frame I have seen a lot here, usually 3 years plus a few months, just out of Applecare. Apparently for G5s thats like 90 in Mac years.
Message was edited by: Samsara

Power consumption with dual power supply

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