About Us At JSI Communications, our focus is on Fiber Optic, Telephone, and Data cable systems used in POTS and LAN-WANs. Get in touch with us today. We are located in the Jackson, MS area and serve clients MS, Al, LA,TN amd West Fl. Project Testing Technicians equiped with EXFO OTDR equipment can quickly identify fiber optic faults and document the results on site.Fiber Optic Splicing equipment