|For a long time i was using 3 * SMC TigerSwitch 10/100 8 port 6709FL2 and they have been running fine but now that my home setup is changing to be running on VMware ESX then i need to change my switch to a better setup, so i got a old Cisco 3560 24port 10/100mbit + 2port 1gbit, so now i better can use Vlan, less port do to VMware and maybe save some power.|
About the power it end up to be using the same.
3 * SMC switch is using 9W each so that is 21W total
1 * Cisco switch 3560 is using 18-21W total
So as you can see it is using basically the same, but it is a much more cool switch there can do a hell lot more
Now to the switch, if you have been around a Cisco in the enterprise class then you know how much noise the FAN inside them is making and my project was to use this switch in my home setup and there i only allow my gear to be super silent, so that was a problem as there was no rum inside the switch to set some nice big super silent FANs.
so i come up with this idea of making a whole new top for the case and by this way make a lot more space in the case for the big FANs and for the air to flow around better.
So i started out trying to find out where to connect the new FANs that i like to install and what was the Volts at the Cisco FAN connector, so i disconnect the Cisco FAN and then the switch start to alert me that there was some thing wrong with the FAN..... yes i know that so i connected a normal PC 3-pin FAN to the internal 3-pin connector on the mainboard and to my surprise the FAN was not running......hmmm why not, so i got my Fluke meter and tryed to see what the power was and volt level, so as it turn out Cisco has not the the 3-pins in the same order as a normal PC 3-pin connector has it, so i changed that so plus, minus and puls-signal was on the right pins and then the fan started to run just fine, but i was still getting alerts in the switch console about the FAN was not work and I tested out many FANs and keep getting the alert and when i used the Cisco FAN then there was no errors, so as it turn out after using a lot of time the Cisco switch don't like the puls-signal a normal FAN is making, but it is simply using short circuit of the minus and alert pin and then the switch stop sending the alerts.
The plus and minus was around 8volt, so do to the way the alert pin was working and there was only 8volt I select not to use that FAN connector on the board for my 3 big FANs as i will not burn the FAN control circuit on the mainboard, so i just connected the FAN alert-signal with the minus pin.
So I found a better place to take the power from and that is from the power-unit where i found 12V that was from what i can see i having a lot more amp then i guess the FAN controller on the mainboard.
I have see a number of post around the Internet where they are saying that they just disconnected the FAN and run without cooling, but i think it is a lot better to have some slow air flow so that is why i have select to do this.
Here you can see the switch with the extra top case in my home rack, it is placed in the rack so there is a bit free space on the top so the air better can get out
I have some old Zalman ram cooler that i never used, so i used them here to make the cooling better for the chips on the board.
On the left is the powerunit where i found the 12V and on the right is the Cisco FAN that i just have disconnected.
This is a mainboard FAN connector that i have not used for the FANs, but i have short circuit the minus and alert-signal pin.
Here you can see my top case from the inside where the new big silent FANs are.
Here the FAN mount and there is a very thin paper between the metal and the FAN, for the dust.
Here is the switch with the new top.
And the backside where i have set a small Zalman fanmate2 there is between the 3 FANs and the 12V, so I control the FAN speed from the outside when it is installed, if i turn the fanmate2 to the minimum then the FANs are still turning fine and cooling.
It was a fun project to do and now it is finish and the switch is in use i am very happy with it as the switch is so silent that i not can hear the switch at all, do to the background noise from the ESX server there is making a very low noise do to the hard-disks in the server.
So with some work, You can make a Enterprise Cisco switch complete silent.