If you do this, I suggest also soldering the pin to the cable (after crimping) to ensure a good mechanical and electrical connection. However, you can get creative and use the small needlenose pliers to manually crimp the pin onto the cable. The tool to crimp them is Molex part number 64016-0200, which is quite expensive at $137.21. The pins are Molex part number 39-00-0039, 18 cents each. The “fan mode jumper” is just a short (1″ or so) length of wire with the correct pins on each end. You will need the following tools and supplies: If you are converting multiple units, you can shuffle converted and un-converted fan assemblies with no downtime. NOTE: While it is possible to do this (with practice) by removing the fan assembly from a running 3945 and converting / reinstalling it before the 3945 shuts down from overheating, I suggest that you power down the 3945 first to avoid the problem.
DELL STUDIO ONE 1909 TABLE TOP COOLING FANS HOW TO
This article shows how to convert a fan tray from the standard 3900-FANASSY to 3900-FANASSY-NEBS with the only new part required being an inexpensive (pennies) jumper and your time to do the conversion. There is an optional fan assembly (3900-FANASSY-NEBS) which has front-to-back airflow, but it is hard to find and represents a large additonal expense, since your 3945 presumably has a fan tray already that is working perfectly (but backwards). While back-to-front is available on a number of Cisco producta, as either a factory option (for example, the Catalyst 4948E-F) or as a field conversion (for example, the Catalyst 4500-X-16SFP), the 3945 is the only Cisco device I’ve encountered which defaults to a back-to-front airflow. The Cisco 3945 router ships with the default airflow “backwards” (back-to-front) compared with all other standard Cisco routers and switches.
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