anning and Optimisation Table 2.17 Timing advance (TA) parameter values Distance (MS-BTS) [m] Distance (MS-BTS) [m] 3300-3850 550-1100 3850-4400 1100-1650 4950-5500 1650-2200 2200-2750 2750-3300 35 000 which defines the automatic procedure when the MS is powered down. The MS informs the network that it is not available for communication. The advantage of attach and detach parameters is decreased signalling - more precisely the automatic procedure prevents unnecessary paging. Parameter Consistency Tool Tools maintaining the network parameter information helps to keep the consistency. The initial parameter planning is done with the network planning tool, e.g. the frequency plan. These parameters can be first exported from the planning tool and then imported to the configuration tool in the network management system. In the configuration for management tools first a plan is created that can be sent to the network during a low traffic period SO that the end users are not disturbed. The network planning tool does not coverall the parameters that need to be set in the network and therefore more planning is required. The parameter consistency tool gives good support to maintain the information, where the data are coming from and the different versions. The parameter consistency tool can maintain data from both the network and the planning tool. When testing new parameter settings, it is worthwhile to keep the old setting as a backup. 2.8.2 Parameter Planning in the EGPRS Network The introduction of EGPRS brings a new set of BSS parameters to control the EGPRS traffic and make the most efficient use of the resources available. This section covers some of the generic parameters. Parameter names are vendor specific and therefore only a generic description of the parameter functionality is provided here. All references are made to GPRS only since the same concepts also apply to EGPRS parameter planning. Parameters GPRS Enabled This parameter defines whether the cell/radio is allowed to handle GPRS traffic. Default GPRS Capa