 slots of 15 seconds in a jacent simulcast areas. One, two or a maximum of three simulcast 60 second cycle are allocated to a site to transmit its paging calls. areas form a paging zone depending on traffic and country. The Code formats are proprietary and speech is not allowed. In the UK duration of the time slot cycle can be adjusted to conform to traffic 5 frequencies of 25kHz channels in the band 153.375MHz to requirements and the differences are shown below. In the case of 153.475MHz are allocated and maximum transmitter ERP of 25W Germany the fixed figure refers to the standard Cityruf system and is allowed. the range allows the possibility of expansion for Euromessage as traffic increases. 45.9.4 German POSP system The methods of filling a time slot with idle words under low traffic level varies between the 4 operators (Table 45.8) as does the total A new u.h.f. private off site paging system (POSP) has been pro- length of time slots. posed in Germany and the specification has been published. This is not an ETSI initiative, and currently only applies to Germany. Each site's transmitter is allocated a specific permanent 6 second slot in 45.10.1.2 Euromessage receiver a 60 second cycle. The time slot sequence is standardised (Num- bered 1 10) and begins with time slot No. 1. at the start of each new Numeric receivers must be capable of receiving at least 15 charac- minute. The allocation of the time slot is carried out by the Deutches ters per call and alphanumeric radio paging receivers at least 80 Bundesposte, when the licence is issued. The use of more than one characters per call. The remaining basic specification for the re- 15W transmitter synchronised to the same time slot is allowed, in ceiver is as in Table 45.9. 45/16 Radio paging 45.10.2.1 Type of service and specification Table 45.8 Methods used for Euromessage Services to be provided are: tone, numeric, alpha numeric and transparent data. Additional optional features are related to: paging acknowledgement, call destination, three levels of prior