• PDH→SDH→MSTP→PTN→O...
• PDH→SDH→MSTP→PTN→O...
• PDH→SDH→MSTP→PTN→O...
• OTN-烽火
• PTN试题1
• PTN试题2
• PDH光端机
• SDH的指针
• 《SDH传送网》
• 13-OTN原理