CMA’s new GTS system

Submitted by YANG Genlu, China

2004.5

1. Current status of the GTS links at RTH BeijingLink Speed Protocol Data Remarks

Beijing-Offenbach 48/48Kbps(FR)

FTP AN,Binary, Fax

Upgraded to IP link and connected to RMDCN in April 2003

Beijing-Tokyo 32/32Kbps(FR)

TCP Sockets AN,Binary, Fax

Connected to RMDCN in February 2004.

Beijing-Seoul 32/32Kbps(FR)

TCP Sockets AN,Binary, Fax

Upgraded to IP link in August 2002

Beijing-Moscow 7.2-28.8Kbps

(V.34)

X.25 AN, Fax Migration to IP planned

Beijing-Khabarovsk

7.2-28.8Kbps

(V.34)

Beijing -> X.25 -> Moscow -> IP -> Khabarovsk

AN Via Moscow

Beijing-Bangkok 9.6Kbps X.25 AN Migration to IP planned

Beijing-New Delhi 9.6Kbps 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

Beijing

Moscow

Hanoi

Pyongyang

Hong Kong

TokyoOffenbach

Khabarovsk

Ulan Bator

Macao

New Delhi

Frame RelayCIR 48/48K

Frame RelayCIR 32/32K

Frame RelayCIR 32/32K

Seoul

Bangkok9.6K

9.6K

64K128K75 baud

75 baud

75 baud

7.2-28.8K (V.34)

7.2-28.8K (V.34)

Exeter

Sofia

Network IINetwork II(RA VI RMDCN (RA VI RMDCN

Ext)Ext)

Melbourne

Buenos Aires

Tokyo

Beijing

New Delhi

Nairobi

Cairo

Toulouse

DakarAlgiers

MoscowWashingto

n

The Improved MTNI.2004

Brasilia

Network INetwork I

Offenbach

Jeddah

Prague

4. GTS system at RTH Beijing

Front End for IP

connections•UNIX

Back End•VMS

Front End for Non

IP connections

VMS

Offenbach

Tokyo

Seoul

Hanoi

Pyongyang

Ulan Bator

Moscow

Bangkok

New Delhi

Asynchronous circuits

X.25 circuits

IP over FR

MSS

PIX

RMDCN RoutersCisco 2620

(HSRP)

GTS RouterCisco 3640

IP over FR

The current GTS system at RTH Beijing

RMDCNRMDCN

Front End[Unix base]

Front End[Unix base]

Front End[Unix base]

Front End[Unix base]

Back End[Open VMS]

Back End[Open VMS]

Back End[Open VMS]

Back End[Open VMS]

Router for GTS connectionsCisco 3640

IOS Ver. 12.1 (2) T

Beijing : AS64519

AS64520Tokyo

211.147.16.130

Host2Host2Host1Host1

MSS

Seoul

NAT (Network Address Translation)

(MSS)211.147.16.130 Private address

AS64770

X.25X.25

Front End(VMS)

Front End(VMS)

Offenbach

BangkokNew Delhi Moscow

Pyongyang

Asynchronous(75 Baud)

Frame Relay Network

Frame Relay NetworkHanoi

Ulan Bator

The CMA’s New GTS System

1. GTS system at RTH Beijing

Offenbach

Tokyo

Seoul

HanoiPyongyangUlan Bator

Moscow

Bangkok

New Delhi

Asynchronous circuits

X.25 circuits

IP over FR

Figure 1 .The new GTS system at RTH Beijing (developing)

Cisco PIX Firewall

RMDCN RoutersCisco 2620

(HSRP)

GTS RouterCisco 3640

IP over FR

Front End

• AlphaServer ES40

• Duplicated system

• UNIX based

Back End

•IBM P650

•Duplicated system

• UNIX based

MSS

Router

Cisco PIX Firewall

Web Server

InternetDMZ

The CMA’s new GTS System (1)

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

MSSOperational moniting

subsystem

Statistics subsystem

Files Transaction

Web

Software facilities of New MSS

Front end collecting and transmitting data via GTS links. Supporting FTP, TCP sockets, X.25, Asynchronous Files switching Files naming conversation

Back end checking data packaging messages and files distributing data to the other internal operational systems, such as real-

time database. 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)

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

unpack

mdp tcop

log

Mfc rfc bc

pack

rp

lp

msg

Tcp server

cp

MSS Processing 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

Files Server

TCP IN FTP IN Local files distribution

Local files distribution

FTP OUTTCP OUT

Files Input and Output Methods

IP Sockets FTP X.25 Asynchronous E-mail Web

The CMA’s new GTS System (3)

Key technologies and measuresa. 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.

b. Development of GUI-based monitor system .A completely new and opened GUI-based monitor system will be developed .

c. 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 .

d. 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