DIN ETS 300639:1997-09
Отменен
Transmission and Multiplexing (TM) - Sub-STM1 Digital Radio Relay Systems (DRRS) operating in the 13 GHz, 15 GHz and 18 GHz frequency bands with about 28 MHz co-polar and 14 MHz cross-polar channel spacing; English version ETS 300639:1996
