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I needed to run it from DC power, and found the -24 was needed to power POTS phones. The -71 V was only needed to ring them, and most would ring from far less. This unit has one "curiosity" - one of the front panel channel LEDs failed, and has been replaced with a brighter one of a different color.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.