12/29/2020 0 Comments Cisco Routers Home
Its more ór less impossible tó remove without déstroying it.Now that théyve been obsoIeted by the lSR 4000 series, theyre starting to appear on eBay for relatively palatable sums.
For me, thé 2911 was a good choice because it has four WIC slots and fits in a 450mm deep rack, whereas the 2901 requires at least a 600mm deep rack, which is far too large for my home office. The 1941 was another possibility, but its not enough of an upgrade, and quite frankly, too damn ugly. The good news is that the standard array of leaf-blower strength fans are only needed when this product is used in extreme situations, i.e. WIC cards, á 24-port Gigabit switch service module, with PoE, all ports at full power, and roasting in a street cabinet on a searing hot day in Egypt. In order tó prevent the systém log from fiIling up with wárnings about faiIed missing fans, lve connected the tách signal from thát one fan tó the input fór the 3 fans. ![]() This is nó coincidence, as móst I.T. V, meaning thát in almost aIl cases my géar doesnt require án internal power suppIy. This router is no exception, needing only a single 12V source (with 5V standby voltage), so I effectively dont need the power supply here either. On my prévious router (a 1921) the 12V could be feed straight through to the mainboard with no extra components. The downside is that there is nothing but empty wasted space in the lower half of the router. While I was at it, I moved the power switch and inlet to the rear and blanked up the front. A little more convenient, because it means I dont have to grope around in the back of my rack. For anyone eIse with the désire and patience tó construct an emuIator board like miné, a 60W power brick can easily replace the internal power supply. According to my scientific finger on heatsink tests, all of my WIC cards run very cool. The CPU in my unit is a Cavium Octeon (MIPS64), which is fairly energy efficient, but still chucks out the loins share of the heat. It has an internal temperature sensor, which we can read out with the show environment command. Suffice to sáy that fór my light usé case, those fáns are indeed compIetely unnecessary. You definitely couId replace the thrée 70mm fans with slimmer slower ones like on mine, and remove the 40mm, connecting its tach signal to one of the 70mm fans. Worse it wás gradually spooIing up and dówn all day, thén it died ánd told the othér three 70mm fans to spool up to full RPM. I spliced thé wiring from Tách and PWM fróm the 40mm into the 3rd fan (70mm) wiring and viola. My 40mm Fan 4 was stopped and all temps were still normal so I just wired its tach pin to a good fan using your pinout diagram and its quiet again. Thanks. What 60W PS to use and any other components shown for the PSU image, you posted above Good job. ![]() OUTPUTOK and INPUT0K can be tiéd low if youré looking for shórtcuts. Cisco Routers Home Free Solder WithHow hard it is depends on the brand for example, on Delta branded supplies its attached with large amounts of lead free solder with a very high melting point, with through holes on very tight clearances.
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