y consists of signalling plans, routing plans, numbering and charging plans, DCN settings, synchronisation plans, etc. This information arises from the network analysis as already described. The major outputs of the detailed core network plan are described below. Routing plans: Types of routing are decided in the analysis and dimensioning phase. Now, routing is fixed, names and naming conventions are adopted and created for destinations and sub-destinations, circuit groups, etc. This is explained in detail in section 4.8. Signalling plans: Signalling points, SEP, STP, etc., are defined. Signalling link numbers and signalling link sets are also finalised. Signalling routes are defined, keeping in mind the protection aspects. Numbering and charging: The numbering group used by each switch is finalised. This usu- ally takes into account geographical locations in order to make it easier. Charging zones are defined, along with methods of collection and record transfers. The main categories CORE NETWORK OPTIMISATION of numbering plans are IMSI (International Mobile Subscriber Identity), MSISDN (Mo- bile Subscriber ISDN number), value-added services number (e.g. in a virtual private network), roaming numbers, handover numbers, test numbers, emergency numbers, etc. Synchronisation plans: Synchronisation is defined at switch level along with the priority settings. The principles of synchronisation were defined in Chapter 2. The source data for each of these aspects is generated for each switch. An example of a detailed plan for SLS is shown in Figure 4.10. Signalling Link Sets {SLS} SIGNALLINGSIGNALLING SIGN ALLINO SIGNALLING SIGNALLING SIGNALLING SIGNALLING SIGNALLING EXTERNAL CONTROLLING NETWORK LINK SET LINK SET POINT POINT PCM TSL REMARKS NUMBER NUMBER PRIORITY NAONAI NUMERIC IDENTIFIER HEX DEC IDENTIFIER NUMERIC NUMERIC NUMERIO NUM-NUM NUMBER INO.INI 0...299 5 CHARACT. 0.3FFF/0....16383 CHARACT 0...254 0..15 0...15 64...511 1...31 DUS01 130-16 FRA01 132-16 Figure 4.10 Detailed plan for SLS 4.7 CORE NETWORK OPTIMISATI