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Reply To: STM-1


E1 (2Mbps) is PDH, STM-1 (155Mbps) is SDH. To transmit a big (I mean BIG) traffic it will be more effective to multiplex several E1 to form STM1 then transmit it over a single optical link and demux it on the other end. There are also STM-4, 16, 64.