Allied Communications Publications are documents developed by the Combined Communications-Electronics Board and NATO, which define the procedures for communicating in computer messaging, radiotelephony, radiotelegraph, radioteletype (RATT), air-to-ground signalling (panel signalling), and other forms of communications used by the armed forces of the five CCEB member countries and/or NATO.
Contains information regarding assignments and use of frequencies; means of communications; message preparation; call signs, routing indicators and address groups and method of determining code speeds, message precedence, etc.
ACP 121 is primarily for use by originators and communications officers.
[4] Delayed Acknowledgement (EMCON) Environments.
[1] Assignments between Cooperating Nations[1]