IEC 61850-85-1 FDIS published for ballot

IEC 61850-85-1 Ed.1 (57/1258/FDIS):
Standard for N times 64 kbit per second optical fiber interfaces between teleprotection and multiplexer equipment (IEEE C37.94)

has been published for FDIS ballot ; ballot closes 2012-08-10.

This standard describes the interconnection details for N, where N = 1, 2…12, times 64 kilobit per second connections of teleprotection equipment to digital multiplexers using optical fiber. Requirements for both
physical connection and the communications timing are also included.