[c-nsp] 7600/6500 Power Supplies

[Robert Boyle]

At 07:04 PM 4/26/2007, Matt Stevens wrote:
>Can someone give me a quick real world lesson on power supplies for the
>7600/6500's?
>
>Looking at Cisco's site it seems that most of the AC supplies will run
>on 110 or 220 volts, with the capacity being halved at 110V.
>
>I'm planning on using a 7606 with a Sup720-3BXL, with maybe a couple
>line-cards to start. I won't be doing any POE and probably never will at
>this location. I'd like to do redundant supplies.
>
>What capacity power supplies should I be looking at? Can I reasonably
>stay at 110V, since it's a lot easier to get in most colo facilities? Is
>there a could rule of thumb for figuring this out?

Each card has a power budget. Figure out how much power you need, 
then make sure either of your two power supplies alone can provide 
it. Here are two snippets. One from a 110V source and another at 208V 
both with 2500W power supplies. You will need the 2nd generation FAN2 
fan shelf which moves more air and uses more power too with the 
Sup720. At 110V with 2500W power supplies, there isn't a lot of power 
if you have many high power usage line cards, but you can fit four of 
the WS-X6348-RJ-45 cards in my 110V config below. You can always 
start with 110V and change to 208V in the future. You can swap the 
power cords one at a time while the router is running. One P/S can be 
fed via 208V while the other P/S is fed via 110V while you upgrade. 
The system will always reserve power for a redundant Sup whether it 
is present or not. I don't know if this feature can be turned off.

-Robert

core3.tdc.nwt#sho power
system power redundancy mode = redundant
system power total =     2331.00 Watts (55.50 Amps @ 42V)
system power used =       857.64 Watts (20.42 Amps @ 42V)
system power available = 1473.36 Watts (35.08 Amps @ 42V)
                         Power-Capacity PS-Fan Output Oper
PS   Type               Watts   A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
1    WS-CAC-2500W       2331.00 55.50  OK     OK     on
2    WS-CAC-2500W       2331.00 55.50  OK     OK     on
                         Pwr-Requested  Pwr-Allocated  Admin Oper
Slot Card-Type          Watts   A @42V Watts   A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
1    WS-X6348-RJ-45      100.38  2.39   100.38  2.39  on    on
4    WS-X6348-RJ-45      100.38  2.39   100.38  2.39  on    on
5    WS-SUP720-3BXL      328.44  7.82   328.44  7.82  on    on
6    (Redundant Sup)       -     -      328.44  7.82  -     -

core2.tlh.nyc#sho power
system power redundancy mode = redundant
system power total =     1153.32 Watts (27.46 Amps @ 42V)
system power used =       791.70 Watts (18.85 Amps @ 42V)
system power available =  361.62 Watts ( 8.61 Amps @ 42V)
                         Power-Capacity PS-Fan Output Oper
PS   Type               Watts   A @42V Status Status State
---- ------------------ ------- ------ ------ ------ -----
2    WS-CAC-2500W       1153.32 27.46  OK     OK     on
                         Pwr-Requested  Pwr-Allocated  Admin Oper
Slot Card-Type          Watts   A @42V Watts   A @42V State State
---- ------------------ ------- ------ ------- ------ ----- -----
1    WS-X6348-RJ-45      100.38  2.39   100.38  2.39  on    on
5    WS-SUP720-3BXL      328.44  7.82   328.44  7.82  on    on
6    (Redundant Sup)       -     -      328.44  7.82  -     -
                         Inline         Inline         Inline         Inline
                         Pwr-Requested  Pwr-Allocated  Local-Pwr-Pool Power
Slot Card-Type          Watts   A @42V Watts   A @42V Watts   A @42V Status
---- ------------------ ------- ------ ------- ------ ------- ------ ----------
1    WS-F6K-PWR            -     -        -     -       34.44  0.82  On




Tellurian Networks - Global Hosting Solutions Since 1995
http://www.tellurian.com | 888-TELLURIAN | 973-300-9211
"Well done is better than well said." - Benjamin Franklin