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
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