CMAs new GTS system Submitted by YANG Genlu

CMA’s new GTS system Submitted by YANG Genlu, China 2004. 5

Link 1. Current status of the GTS links at RTH Beijing Speed Protocol Data Remarks Beijing-Offenbach 48/48 Kbps(FR ) FTP AN, Binary, Fax Upgraded to IP link and connected to RMDCN in April 2003 Beijing-Tokyo 32/32 Kbps(FR ) TCP Sockets AN, Binary, Fax Connected to RMDCN in February 2004. Beijing-Seoul 32/32 Kbps(FR ) TCP Sockets AN, Binary, Fax Upgraded to IP link in August 2002 Beijing-Moscow 7. 2 -28. 8 Kbps (V. 34) X. 25 AN, Fax Migration to IP planned Beijing. Khabarovsk 7. 2 -28. 8 Kbps (V. 34) Beijing -> X. 25 > Moscow -> IP -> Khabarovsk AN Via Moscow Beijing-Bangkok 9. 6 Kbps X. 25 AN Migration to IP planned Beijing-New Delhi 9. 6 Kbps X. 25 AN Migration to IP planned Beijing-Hanoi 75 baud ASYNC AN PCVSAT receive-only station installed Beijing. Pyongyang 75 baud ASYNC AN PCVSAT receive-only station installed Beijing-Ulan Bator 75 baud ASYNC AN PCVSAT receive-only station installed

2. Current status of the GTS links at RTH Beijing Moscow Offenbach 7. 2 -28. 8 K (V. 34) Khabarovsk Frame Relay CIR 48/48 K Tokyo Frame Relay CIR 32/32 K 7. 2 -28. 8 K (V. 34) Ulan Bator Pyongyang Frame Relay CIR 32/32 K 75 baud Beijing 75 baud 9. 6 K Bangkok 9. 6 K 75 baud Hanoi Seoul 128 K Macao 64 K New Delhi Hong Kong

The Improved MTN I. 2004 Network I Beijing Tokyo Melbourne Washington Moscow Prague Brasilia Buenos Aires New Delhi Offenbach Exeter Network II (RA VI RMDCN Ext) Toulouse Dakar Jeddah Nairobi Sofia Cairo Algiers

4. GTS system at RTH Beijing IP over FR Front End for IP connections • UNIX Offenbach RMDCN Routers Cisco 2620 (HSRP) Tokyo PIX GTS Router Cisco 3640 IP over FR Back End • VMS Moscow X. 25 circuits Front End for Non IP connections VMS Bangkok New Delhi Asynchronous circuits Hanoi Pyongyang MSS Ulan Bator The current GTS system at RTH Beijing Seoul

Tokyo Offenbach New Delhi Bangkok AS 64770 Moscow Frame Relay Network RMDCN Hanoi X. 25 Ulan Bator Seoul AS 64520 Pyongyang Asynchronous (75 Baud) Router for GTS connections Cisco 3640 IOS Ver. 12. 1 (2) T Front End (VMS) Beijing : AS 64519 211. 147. 16. 130 MSS Host 1 Front End [Unix base] Host 2 Front End [Unix base] NAT (Network Address Translation) (MSS)211. 147. 16. 130 Private address Back End [Open VMS]

The CMA’s New GTS System

1. GTS system at RTH Beijing DMZ Internet Web Server Back End • IBM P 650 Cisco PIX Firewall RMDCN Routers Cisco 2620 (HSRP) IP over FR GTS Router Cisco 3640 IP over FR Tokyo Offenbach Cisco PIX Firewall • Duplicated system • UNIX based Moscow Front End X. 25 circuits • Alpha. Server ES 40 • Duplicated system • UNIX based Bangkok New Delhi Router Asynchronous circuits MSS Hanoi Pyongyang Ulan Bator Figure 1. The new GTS system at RTH Beijing (developing) Seoul

The CMA’s new GTS System (1) v Hardware and Network The data communication system and the Message Switching System (MSS) are two separate systems. Each system is a duplicated system. Moreover, in order to provide real-time meteorological data to national and international users, the Internet web site environment is set up independently.

The Software structure Files Transaction Statistics subsystem MSS Web Operational moniting subsystem

Software facilities of New MSS v Front end collecting and transmitting data via GTS links. Supporting FTP, TCP sockets, X. 25, Asynchronous Files switching Files naming conversation v Back end checking data packaging messages and files distributing data to the other internal operational systems, such as real-time database. v Operational monitor system monitoring and managing the application system C/S based software running on Linux based PCs

The CMA’s new GTS System (2) v Application Software The application software of the new GTS system consists of three subsystems, i. e. , communication subsystem, MSS and operational monitoring subsystem. The communication subsystem, supporting diversified circuits and various protocols, collects data from GTS and relays them to MSS where data recognition, archiving and distributing to the other internal operational systems, such as domestic communication system and real-time database system, is accomplished. At the same time , MSS provides national and international data as operational requirements to communication subsystem where data distribution via the appointed GTS circuits is completed. A lot of operation condition of the CIMCS, such as data transmission and system operation, are performed by the operational monitor subsystem.

MSS data flow mdp tcop unpack Mfc pack rfc bc log rp msg lp Tcp server cp

MSS Processing v v v source from ftp server and files server Domestic data reediting to WMO standers Data is identified by WMO heading Data stored in a receive queue along with information retrieved from a routing catalogs Data written to transmit queue based on routing catalogs information Data sent to files server

Files Transaction data flow TCP IN FTP IN Local files distribution Files Server Local files distribution TCP OUT FTP OUT

Files Input and Output Methods v IP Sockets v FTP v X. 25 v Asynchronous v E-mail v Web

The CMA’s new GTS System (3) v Key technologies and measures a. Migration of MSS software. VMS platform will be replace by UNIX platform in the new GTS system. So, it is necessary to make a thorough analysis of MSS software, and move its core technologies and functions to UNIX-based system. Development of GUI-based monitor system. A completely new and opened GUIbased monitor system will be developed. Adjusting data flow and re-organizing operation. The principal data transmission node will be changed from a message basis to a file basis. The relevant adjustment will also be made on such aspects as data flow and operation organization , management and running. Establishing a close connection between the current domestic communication system and the third generation CIMCS. Due to some historical reasons, CMA’s domestic comm. System and its international comm. System are two separate systems, and running on two different platforms. However , it is inevitable that the real-time data and products need exchanging and sharing between the two system. Thus , the functions and features b. c. d.