ion involved limits transmission speed and this method of operation is 60.2.5.1 Strategic requirements being superseded by point to multipoint computer data transfer. Providing the raw data to the local processor allows action replays These machines normally operate in regular office environments of changing conditions, which are not easily appreciated from the and apart from interoperational requirements for secure fax or printed meteorological charts. The existing network base continues tactical machines, communication can usually be met by standard in operation supplementing the data network. CCITT G3 models. 60.2.3 Pagefax equipment 60.2.5.2 Tactical requirements In this area there are no standards, the equipment being tailored to Machines for this use include military battlefield equipment to suit individual newspaper requirements. Compression and trans- operate under inhospitable environmental conditions, fast, reliably mission characteristics, reproduction ratio, and image processing and securely. Standards are desirable to ensure interoperation be- are all selected to suit production requirements in the remote print- tween allies of different national forces. ing of the full newspaper pages. Typical features of the NATO standard are: The savings in transportation costs and time, by using this equip- ment, funds sophisticated high speed transmission developments, 1. Up to 16 grey shades for photographs. including the transmission of colour separation with sequential 2. G3 standard and fine resolution equivalents. receptions on the same receive mechanism. 3. Broadcast and duplex network operations. 4. G3 MH compression, also uncompressed and BCH forward error correction. 60.2.4 Mobile equipment To be acceptable this equipment should be lightweight, easy to There have been several attempts at mobile facsimile, some using operate in arduous conditions and capable of various communica- narrow format (100cm) machines. The most popular method was to tion modes, including high speed burst mode to avoid radio loca