scope:

Although applicable to all cooperating communications systems, MISPEC is particularly applied to the electronic identification system IFF, employed as internationally agreed throughout NATO. However, a number of system variances will be encountered within the general terms of IFF (Identification Friend or Foe) and SSR (Secondary Surveillance Radar). The majority of differences are historical but variances are also those associated with modes of operation and reply capability. Within the context of this Data Collection Guide, equipments designed to conform to different agreements may be encountered and are described in general terms in the following paragraphs. The description does not. however, include systems of previous design that will not inter-operate with the systems to be examined.