TI Silent 700 power supplies

On Wed, 15 Dec 2004, Vintage Computer Festival wrote: I decided to pull my Silent 700 out of storage tonight, however it turns out the power supply seems to be MIA. I guess it got separated from the terminal the last time I moved things around when I was bringing in the batch of Alpha and VAX systems I got this year. I'll take a multimeter to my terminal later, but if the power supply has a ground pin on the line plug, the center pin of the 3 pin molex connector would very likely be a ground. Since the terminals were usually connected to telephone equipment, it would make sense that TI provided a ground back then. Its also possible that the center pin is a center tap for the transformer, but since I can't find my power supply, I really can't say for sure without looking at the internals of the terminal. On the topic of battery packs, the cells that make up the batteries used in these terminals are still available. Each of the two battery packs is made up of 4 series wired EnerSys (formerly Hawker Energy (formerly Gates)) Cyclon "D" 2V cells. As of now, the part number for these is 0810-0004. The battery packs each have an in-line fuse, but I'm not sure what the rating is or where it is wired in. The positive lead of the packs terminates to the keyed/pointed end of the molex connector. The cells that make up genuine TI battery packs do not have any markings on them but they are a very distinctive type of cell and only one company makes them. They are a sealed lead acid cell with a spiral wound grid type plate. Due to their unique design, it is not uncommon to get 15-20 years of service life out of them if they are properly charged and maintained (I've replaced a number of 15+ year old cells that finally quit holding a full charge). I've used these type of cells extensively in data collection and remote monitoring / standby applications. For detailed information on the individual cells see: http://www.enersysreservepower.com/cyc_b.asp?brandID=4 -Toth