Depending on the source group, different LCR routes can be selected without, for instance, rendering a special LCOSx assignment necessary. This allows not only the routing to be designed on a node-dependent basis, but also to be broken down even further (e.g. distinction according to shelf). The LCR routes belonging to a source group are defined in a table with the AMO LPROF. In AMO LDPLN, it is then possible to refer to such a table with the parameter PROFIDX. If an index entry exists in the digit pattern (in AMO LDPLN), the table administrated by AMO LPROF is branched too, and concurrence of the specified source group with the table values checked. If a matching entry is found, the further path selection is realized on the basis of the LTRE specified therein, otherwise, the LROUTE originally entered in AMO LDPLN is further used for path selection.