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Automation of NMCs for GTS operation

Automation of NMCs for GTS operation. Guangzhou, Dec. 8, 1998 SHI Peiliang NMC, CMA shipl@rays.cma.gov.cn. GTS. Database. Data processing & display. A Typical Conceptual Diagram of NMC. Satellite Broadcast. Communication System. Local Users. Local Area Network.

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Automation of NMCs for GTS operation

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  1. Automation of NMCs for GTS operation Guangzhou, Dec. 8, 1998 SHI Peiliang NMC, CMA shipl@rays.cma.gov.cn

  2. GTS Database Data processing & display A Typical Conceptual Diagram of NMC Satellite Broadcast Communication System Local Users Local Area Network

  3. Technology Development Overview • GTS • Faster, more reliable links • X.25 being widely used, but the technology is becoming obsolete • TCP/IP to be introduced gradually (WMO Guide on the use of TCP/IP on the GTS) • Satellite Broadcast • Will become major data source for most NMCs in terms of data volume

  4. Washington Moscow 9600 9600 Novosibirsk 7200 Khabarovsk 64 kb/s Almaty 7200 9600 9600 50 75 Bishkek 4800 9600 7200 9600 Tokyo PyongYang 75 Tashkent Ashgabad Ulaanbaatar Offenbach 75 75 75 75 N/O Baghdad Dushanbe 64 kb/s Tehran 64 kb/s Beijing 50 50 64kb/s 75 N/O 9600 Offenbach Kabul Seoul 7200 4800 Kuwait 50 N/O 100 9600 50 200 Karachi 9600 9600 New Delhi 50 Bahrain Hong Kong 1200 Jeddah 50 75 Doha 1200 50 75 N/O Kathmandu Macao 9600 Moscow 1200 50 100 Emirates 200 Cairo 9600 100 Muscat Hanoi 2400 100 Algiers N/O Dhaka 200 Manila 50 Sanaa Vientiane Colombo 75 75 1200 Yangon Cairo 50 64 kb/s 200 N/O Male 50 Melbourne 200 Bangkok RTH 75 Phnom Penh NMC N/O Melbourne 1200 Kuala Lumpur Centre in other region MTN circuit Regional Meteorological Telecommunication Network for Region II (Asia)point-to-point circuits implementation (transmission speed in bit/s) Regional circuit Interregional circuit 25.02.1998

  5. Technology Development Overview • Computer • faster PC---->Workstation---->super computer • cheaper • easier to maintain, modular design, low environment requirement • operating system - dominated by UNIX • network protocol - dominated by TCP/IP • The rapid advances in high performance computing technology make it possible for smaller centres to do NWP operation, e.g. MM5

  6. Technology Development Overview • Local Area Networks • Ethernet, 10/100 mb/s, cost-effective, HUB/Switch connection, meets most of the requirements of a NMC • FDDI - very mature LAN backbone technology, 100mb/s, widely used at big centres • ATM - cell switching based, speed varies from 155mb/s to 622mb/s or even higher, good at multimedia applications, suitable for campus area network backbone, relatively new technology, not cheap • Gigabit Ethernet - new technology, 1000mb/s, needs time to mature

  7. Technology Development Overview • Database • File based appropriate databases are still widely used, efficiency is the main reason • Commercial DBMSs becoming more and more popular, Sybase/Oracle/Informix etc, efficient and very flexible for small pieces of data

  8. Experiences and lessons • Buying equipment is easy, while designing and implementing your operation system is not; you know your applications better than anybody else • Hardware devalues quickly, so the time between installation and production should be made as short as possible

  9. High Performance Computers at NMC-Beijing

  10. NMC’s LAN at present Hubs/switches providing Ethernet access to each office rooms Alpha servers STK tape library R Cray J90 VAXs FDDI ring Cray C90 SGI workstations R IBM SP Other National level Centers and buildings in the CMA campus

  11. DECNET Domestic Networking Centre TCP/IP, DECNET FEP Alpha 1000 FEP Database FDDI Ring Cluster Alpha 1000 FEP FEP Super Computers RTH-Beijing, 1998

  12. Recent developments at RTH-Beijing • Computer upgrading completed last year • Main system for MSS: VAX780 --> DEC Alpha 1000 Cluster • Database computer: VAX6340/6440 --> Alpha 4000 Cluster • New SCSI Disks on front-end processor • FDDI Network interface on all Alpha servers • OpenVMS provides good portability from VAX/VMS • MSS software enhanced for T4 fax handling

  13. Recent developments at RTH-Beijing • Circuit upgrades 9.6kbps analogue ---> 64kbps digital for Beijing-Tokyo (11/97), and Beijing-Offenbach (6/98) • T4 fax operation Average transmission time for one chart cut down from 20 minutes to 1 minute • Beijing-Moscow: LAPB ---> X.25 PVC

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