Both PDH and SDH have globally unified standards.

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EPL services exclusively use ports and bandwidths, and different users may need to share resources. Which of the following methods can be used to isolate user data?

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Which of the following is the multiplexing mode of SDH?

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Which of the following is the basic requirement of a DWDM system on a light source?

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Linear MSP (LMSP) has two modes; 1+1 and 1:1. Extra services can be configured for the protection channel only in the 1:1 mode of LMSP.

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