Archive for October, 2020

Replacing a Pollcat Power Supply

Saturday, October 3rd, 2020

Replacing a power supply should not be a noteworthy task; but when an exact replacement for the failed power supply isn’t available, one wants to exercise some care and diligence installing a compatible-but-different power supply.

Shamefully long ago (cue Wham’s delightful “Last Christmas” and sing along to ignore the guilt), one of the two redundant Pollcat telephony call-detail-monitoring gateways at work didn’t recover after datacenter electrical maintenance. Last weekend I finally looked at it, confirmed that the power supply was dead, and confirmed that the rest of the unit operated fine when run from bench power.

Pollcat shown with new and broken power supplies

I couldn’t find a reasonable source for the original model of power supply (the right of the two, toward the center of the photo); so after a bit of searching came up with different a 5-VDC 2-A open-frame power supply (the left, on some bubble wrap) that can physically fit into the available space in the enclosure and that can also operate from 100-240 VAC (important for datacenter 208 VAC) for a very affordable $10. We ordered a couple of them and I got it replaced this afternoon. I expected from the beginning to have to make a mounting adapter, but I also had to mind the polarity of both the AC and DC power connectors.

(more…)