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Earn +20 ptsQ: How many e1s make STM1?
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How many DS3 in STM1?
3 ds3 in stm1
What is KLM in SDH and how E1s numbered in VC4?
173
Have a confusion that one STM1 has 63 E1. Size of E1 is 2.048Mbps. then size of one STM1 should be equals 63x2.048 equals 129.024Mbps. but in real STM1 is 155Mbps?
E1 is carried inside C-12 container in SDH enviroment. Size of container is bigger than payload requirment of E1 in order to have clock alignment, justification opportunity bits, justification control bits, & overhead bits. C-12 container is 272 bits which multplies with 8000 (frames per second) to get data rate for one C-12 per second. Multiplying it with 63 will give you 137.088 Mbps.
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