ry parameters involve defining the VCs, VPs, VCIs, VPIs, connection types such as CBR and UBR, etc. Other parameters include defining the bandwidths of connections, type of traffic carried and type of interconnection and cross-connections. IP Parameters The IP setting mainly consists of IP addresses both public and private. The addresses need to be defined for ATM and Ethernet interfaces. Parameters related to routing tables are also defined, especially if the communication to the indirectly connected nodes is there. Destination and gateway addresses are defined along with the masking bits (if required). Synchronisation As mentioned in previous sections, e.g. Section 3.11, the main parameters include defining the clock sources (primary and secondary), interface units and clock priorities. Network Management Some parameters are defined for the interaction between the BS and NMS. These include parameters related to equipments IDs, configuration management, registrations and alarms related to them. 3.13.2 RNC Parameters RNC is an interface between the BS, MGW and SGSN. It is the 'brain' of the network and results in many more parameters being defined for the RNC as compared to the BTS/AXC. However, the synchronisation concept remains the same as defined in BTS/AXC. Equipment Interface Parameters The parameter configuration flow is shown in the Figure 3.73. As discussed in the AXC/BTS, the PDH and SDH parameters need to be configured and include the PDH exchange terminal (PET) and the SDH exchange terminal (SET) as well as the parameters related to exchange terminals, protection group, ATM access profiles, physical interface, etc. The configuration includes defining the operation mode (E1, T1, etc.), frame alignment mode, loop back testing, TS usage (i.e. the number of TSs required to carry the GSM and 3G traffic respectively), BER threshold levels, protection, etc. ATM Parameters These include the parameters VP, VC, VPI and VCI. The ingress and egress bandwidths are defined along with the type of traffic that is car