| 1 | The view has been verified by the tide of deploying Broadband IP Metropolitan Area Networks. | |
| 2 | SONET has long been the medium of choice for delivering services over metropolitan-area networks ( MAN ). | |
| 3 | The application of the EMAN, become the key question that we pay close attention to. | |
| 4 | RPR (Resilient Packet Ring) and MSR ( Multi-Service Ring) are the two newest MAN application scheme. | |
| 5 | Resilient Packet Ring(RPR)is regarded as the substitution to re -build MAN to meet the demand. |
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