• TTA Journal
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• s.63
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• pp.40-50
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• 1999

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.461-463
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• 2018

In this paper, we have studied the devices needed for long distance wireless transmission of SDH network. This devices propose wireless transmission and measurement method of STM-1(basic transmission unit of SDH method) signal and 200Mbps synchronous ethernet. The synchronous clock recovery function is provided for STM-N transmission and synchronous ethernet transmission, and spare clock switching function is designed for stable synchronization. In addition, we discussed the measurement method of STM-N and synchronous Etherent communication method in wireless transmission section.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.36S no.11
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• pp.9-14
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• 1999

In this paper, a method of one line transmission of 622Mbps to interface a low speed part with a high speed part is introduced instead of H-BUS method of the 10 line transmission of 77.76Mbps in the 10Gbps optical transmission system. For this method, a reframing method to align the received data of 622Mbps transmission to STM(Synchronous Transfer Mode)-64 frame of SDH(Synchronous Digital Hierarchy) is described. Reframing is designed with VHDL and applied in the 10G-S4 ASIC of T14U board of 10Gbps optical transmission system.