| 1. | Sonet . telecommunications - synchronous optical network - payload mappings 电信.同步光纤网 |
| 2. | Sonet . telecommunications - synchronous optical network : physical layer specifications 电信.同步光纤网 |
| 3. | Sonet . telecommunications - synchronous optical network - tandem connection maintenance 电信.同步光纤网 |
| 4. | Sonet . telecommunications - synchronous optical network - automatic protection switching 电信.同步光纤网络 |
| 5. | Synchronous optical network , sonet 同步光学网络 |
| 6. | Sonet synchronous optical network 同步光纤网络 |
| 7. | Sonet : synchronous optical network 同步光网络 |
| 8. | Synchronous optical network sonet 同步光网络 |
| 9. | Sonet synchronous optical network 同步光纤网 |
| 10. | Synchronous optical networking 同步光纤网络 |