Traditional Culture Encyclopedia - Traditional stories - What is the difference between SDH and PDH?
What is the difference between SDH and PDH?
PDH is a quasi-synchronous digital transmission system and SDH is a synchronous digital transmission system. PDH signal can be transmitted in SDH. STM-N is the standard rate of SDH. The values of N are 1, 4, 16, 64 (the maximum at present), and the corresponding rates are 155m, 622m, 2.5g, 65434 respectively.
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