• Proceedings of the IEEK Conference
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• 2004.06a
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• pp.127-130
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• 2004

This paper describes the design and implementation of a SNMP Agent for NG-SDH transmission system. One of the most important items in SDH network management is the information model that implements every function of SDH equipment at network level. Although the TMN framework of SDH information model has been defined quite well, CMIP constraints of a real implementation urge vendors to implement proprietary features, and make it more difficult to maintain an integrated view of multivendor SDH networks management. To solve these aspects, this work proposes SNMP information model that allows a simple view of NG-SDH network management.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.12A
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• pp.1120-1135
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• 2005

In this paper, We have design and implement the network synchronization module for NG-SDH system having 120 Gbps capacity. and also evaluate the performance of it. We also propose analyzing algorithm clock characterisrics on NG-SDH node clock based on the evaluation results.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.6
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• pp.1289-1301
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• 1997

In a SDH network, one of the most important issues is the realization of network synchronization. In this paper, we presented the relationship between parameters and control algorithm of DP-PLL for design in a SDH based time, SSM processing time, PJE counter and reference switching time, and analyzed phase transients for one node and mutiple nodes through our simulation results with a standard specification. We suggested suitable design method of SDH-DP-PLL.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.417-420
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• 2002

In this paper, we implemented a SDH synchronous network system based on ITU-T recommendation G.707 - Network node interface for the synchronous digital archy(SDH). For the system, we used signal processing SDH ASIC, and designed a FPGA_Control chip for various signal control and a FPGA_Alignment cllip for data alignment using YHDL(Very high speed integrated circuit Hardware Description Language). For system monitoring, an operation system was developed using ANSI C and executed in CPU (Motorola MPC-860). The system was evaluated by using ANT-20 for data transmission error defection, jitter detection, pointer chocking, and overhead determination.

• Journal of the Institute of Convergence Signal Processing
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• v.15 no.4
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• pp.169-175
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• 2014

NG-SDH system is connected with networks throughout optical fibers. Network synchronization controller is a necessary for the data synchronization in each optical transmission system. In this paper, we have design and implementation the network synchronization controller using SOPC(system on a programmable chip) design technic. For this network synchronization controller we use FPGA in Altera. FPGA includes 32bit CPU, DPRAM(dual port ram), digital input/output port, transmitter and receiver framer, phase difference detector. We also confirm that designed network synchronization controller satisfies the ITU-T G.813 timing requirements.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.7A
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• pp.678-685
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• 2007

We implemented the network synchronization equipment for the optical transmission platform or next generation Packet/TDM(Time Division Multiplexing) data converged switching system and then, presented an impact of wander generation on the NG-SDH optical transmission network.

• The KIPS Transactions:PartC
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• v.13C no.3 s.106
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• pp.303-310
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• 2006

This paper is to execute a study for characteristic analysis of synchronization clock and maximum network node number with various clock states, normal, SPT, LPT, in NG-SDH networks. Through the simulations, maximum network node numbers showed from 42 to 38 nodes in normal state. In SPT state, maximum network node numbers, when the last NE network applied to only SPT state, presented from 19 to 4 nodes, much less than normal state. Node numbers to meet specification in case of occurrence of SPT state in all NE networks decreased greatly. In LPT state, all maximum node numbers, when the last NE network applied to only LPT state, presented more than 50 nodes, and the results in case of occurrence of LPT state in all NE networks were also identified. However, node numbers to meet specification in case of LPT state in all DOTS networks were few large with difference between LPT and normal or SPT state.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.715-717
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• 2004

인터넷의 폭발적인 성장으로 인하여 MAN(Metropolitan Area Network)은 기존 음성 트래픽 전송 중심의 SONET/SDH(Synchronous Optical NETwork/Synchronous Digital Hierarchy) 환경에서 데이터 트래픽을 수용 할 수 있는 MSPP(MultiService Provisioning Platform) 환경으로 변해가고 있다. 이러한 네트워크 환경에서 이종 망간의 스위칭 역할을 수행하는 NG-SDH장비는 각 망간의 OAM을 제공하기 위해 OAM(Operation/Administration/Maintenance)신호에 대한 IWF(InterWorking Function) 기능을 필요로 하게 된다. 본 논문은 이종 망간 OAM 기능 제공을 위한 IWF에 대해 분석, 정의하고 이를 기반으로 NG-SDH 장비 블록 내에서 이종망간 OAM 기능을 제공할 OAM 변환기를 설계하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.10
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• pp.110-118
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• 2003

The paper describes a design process of the connection control function that performs overall procedures of optical network control system in the Next Generation - Synchronous Digital Hierarchy (NG-SDH) based transport system. Here, the NG-SDH means a new SDH technology that could perform automatic connection control with a granularity of VC-3 (about 50M) or VC-4 (about 150M) according to the increase and decrease of traffic, which is different from the existing technology that could perform connection control only with a granularity of a physical SDH link (STM-l, STM-4, STM-16, STM-64, STM-256 etc). The NG-SDH based connection control allows an ingress NG-SDH node to control the appropriate connection establishment process according to connection types such as Permanent Connection (PC), Soft Permanent Connection (SPC), Switched Connection (SC) over various SDH and Ethernet line cards.

• 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.