28th January 2005 at 04:39
#40571
BANAYRA
Guest
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.