 radio system normal G3 equipment can operate when a telephone type interface is available. Type and Page size Nominal Index of Transmissio The Cellular Line Interface connection can be sophisticated and standard resolution n time allows automatic answering and call origination by the G3 machine. (lines/mm) operation Calls made between the mobile and normal PSTN connections provide access to the large G3 installed base. Photofax 210 X 210 4 and 8 or 352 and 8 to 30 CCITT Opinions differ about operations above 4.8kbit/s. Some believe in to 254 x 5 and 10 operating as fast as possible, while the connection is good, whilst others prefer to rely on the improved signal/noise performance at Weatherfax 450 X 560 4 and 2 576 and 4 to 36 lower modem rates. Most opinions however recommend the use of CCITT ECM. Pagefax Up to 450 15 to 100 2 1 to 3 min The question of facsimile use on GSM is another matter because proprietary X 625 specified the system codes the voice and there is no synchronous transparent (1600 channel available for facsimile. The topic is well studied but no upwards) clear proposal has emerged. Mobilefax 1 min proprietary 60.2.5 Government and military equipment Military4 215 297 4 and 8 20 sec to Similar requirements exist for the transmission of documents, maps, specified 20 min drawings, photographs etc. as in other market segments. One major Stanag (264/528) difference is that for the transmission of documents classified for national security, additional high performance data encryption equipment is required. Further, to avoid plain language signals from the fax equipment itself being intercepted, and to avoid compromi- sing the encryption key generator codes, significant precautions must be taken in equipment design to reduce the relevant radiated 60.2.2 Weatherfax equipment and conductive electromagnetic emissions. These security require- ments are not normally published. These equipments are usually operated on private circuits or radio networks, on a simplex broadcast basis. The analogue transmiss