4.1 General
Mode of operation:
. simplex: operation method in which transmission is made possible alternately in each direction of a telecommunication channel, via use of one or two frequencies;
. duplex: operation method in which transmission is possible simultaneously in both directions of a telecommunications channel, via use of two frequencies;
. semi-duplex: A method which is simplex operation at one end of the circuit and duplex operation at the other, via use of two frequencies.
Type of use:
. Shared: use of a channel/frequency by more than one entity;
. exclusive: use of a channel/frequency by a single entity.
Scope of use:
. n - national scope: use of a channel/frequency at the level of the national territory;
. g - specific geographic zone: use of a channel/frequency in a specific and well defined area, via radiocommunications stations such as fixed stations, broadcasting stations and earth stations.
