8370 km with 22 dB spans ULH transmission of 185*10.709 Gbit/s RZ-DPSK channels

185*10.709 RZ-DPSK channels are transmitted at a distance of 8370 km over 22 dB spans using only with C-band EDFA. High potential of use of this transmission is highlighted with experiments exhibiting system margin above 5000 km.