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| | Synchronous_clock Interface B |
| | Synchronous_clock Interface H |
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| | Electrical Interface Switching of STM-1×4 |
| | Electrical Interface Switching of STM-1×8 |
| | Bridge Interface of STM-1e/E3/T3/FE |
| | Electrical Process of E1×63(75 Ω) |
| | Electrical Process of E1×63(120 Ω) |
| | Electrical Interface of E1×63(75 Ω) |
| | Electrical Interface Switching of E1×63(75 Ω) |
| | Electrical Interface of E1×63(120 Ω) |
| | Electrical Interface Switching of E1×63(120 Ω) |
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| | Electrical Interface of FE with Switch Function |
| | Electrical Interface of STM-1 |
| | Transparent Gigabit Ethernet with Enhanced Performan |
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| | Single-channel Booster Amplifier |
| | Single-channel Booster Amplifier |
| | Single-channel Booster Amplifier |
| | Single-channel Pre-Amplifier |