Ronayne, John creator London Pitman 1986 212p : ill. Introduction to communications switching (Page-3), Introduction to communication transmission (Page-20), Pulse code modulation (Page-29), Error sources and prevention (Page-50), Digital exchanges and switching(page 70)6.digital exchanges and control (Page-99), The digital network (Page-128), Digital frontiers (Page-165), System review and the next generation (Page-182). John Ronayne Telecommunication engineering 621.382,RON 0-273-02178-8 20221209104933.0