Land-line analog telephone service was ubiquitous in most of the 20th Century. This hardware is now commonly Plain Old Telephone Service (POTS).  This was our primary means of communication. It was simple, robust, and reliable. A few users still have landline service, although most landline service has migrated to digital means over a public Internet connection, with a modem at the user’s residence converting the digital data back to analog and providing ringer voltage to operate the bell. A lot of these telephones and associated equipment still exist, and are sitting in basements and attics. They could be easily pressed … The post Secure Local Comms With POTS Equipment, by Tractorguy appeared first on SurvivalBlog.com.