IEC (МЭК) - Все для студента. IEC 2003, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland- 36 p. This part of IEC 61850 specifies the specific communication serv mappings for the communication between bay and process level and it specifies a mapping on a serial unidirectional multidrop point to point link in accordance with IEC 60044-8.