sp;the data service unit strips off the encoding used to package the data.
Typically, the CSU/DSU needs to be informed of the frame encoding (B8ZS, Bipolar 8 Zero Substitution, or AMI, Alternate Mark Inversion), the frame encapsulation technique (either D4 Superframe,&n页码:[1] [2] [3] [4] [5] [6] 第4页、共6页 |