Codan Radio MT-4E Paging - Manual (Page 11)

MT-4E PAGING SYSTEMS | USER GUIDE
Chapter 1: Introduction to Paging Page 3
Analog Tones
Analog tones can be sent as a two-tone or fi ve / six tone format. The two-tone analog paging technique
transmits two sequential audio tones, of different tone durations, to address a pager. The fi ve / six tone
analog paging format was an improvement on the two-tone format, in that it can address more pagers
and can also save battery life in the pagers by addressing in groups (a group of pagers not addressed,
will not come out of sleep mode, saving battery life). The analog tone encoding format can support tone
only as well as tone and voice paging. In a voice page, after transmitting the tone and waiting a short
period, the speaker of the pager is connected directly to the analog signal so that transmitted analog
voice signals are heard on the pager.
Other Paging Protocols
There are many other paging protocols such as the Swedish MBS format, NEC, ERMES (the European
Radio Message Standard), and ReFLEX™, Motorola’s two-way paging protocol.