Technical Services for Mine Communications Research. Applicability of Available Multiplex Carrier Equipment for Mine Telephone Systems.
Lagace-RL; Bender-WG; Foulkes-JD; O'Brien-PF
NTIS: PB 249 829 Available for Reference At Bureau Libraries :95 pages
Available analog and digital telephone multiplexing equipment is investigated for its potential to upgrade the traffic-handling capacity of present mine phone systems and provide for selective calling. The assessment includes impact on the constraints imposed by overall mine communications, safety regulations, present mine pager phones and phone line networks, potential interference trolley wire communications, pager phone interfacing and line conditioning requirements, and cost. A representative mine in a communications sense is formulated to serve as a common basis for system and cost comparisons. The investigation reveals that only two or three frequency multiplexed subscriber carrier systems can be considered as serious candidates. The practicality and cost of installing multipair cable in underground mines is also assessed.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 249 829 Available for Reference At Bureau Libraries
Arthur D. Little, Inc.