Operational procedu res for observational
data collection at RTH Bangkok
Kumpol Luengpetngam Telecommunication Divis
ion, RTH: Bangkok- E mail: kumpol@metnet.
tmd.go.th
RTH BangkokThe telecommunication division of the Meteorological Department of Thailand has assumed as the responsibility of being the Regional Telecommunication Hub (RTH) for south east asia since 1967, upon the request from the World Meteorological Organization (WMO).
Regional Meteorological Telecommunication Network for Region II (Asia)point-to-point circuits implementation (transmission speed in bit/s)
RTH
NMC
Centre in other region
MTN circuitRegional circuit
Interregional circuit
Algiers
Cairo
Offenbach
Moscow
Vientiane
Ulaanbaatar
Baghdad
Manila
Kuala LumpurMelbourne
Washington
Offenbach
Muscat
Doha
Kuwait
Bahrain
Dhaka
Yangon
Kathmandu
Kabul
Karachi
Colombo
MaleBangkok
Hong Kong
HanoiCairo
Sanaa
Jeddah
Phnom Penh
Tokyo
Khabarovsk
Moscow
PyongYangAshgabad
Macao
Melbourne
New Delhi
Tehran
Novosibirsk
Emirates
9600
4800
2400
96009600
7200
7200
9600
9600
64 kb/s
75
75 96009600
64 kb/s
200
16 Kbps
200
9600
9600
75
100
50
120050
200
16 Kbps
50
50
50
75
7200
50
75
7200
100
1200
1200
200
75
75
50
50
100
100
75
64kb/s
50
50
75
9600
50
Tashkent
Dushanbe
Bishkek
Almaty
75
7575
4800
1200
50
N/O
N/O
N/O
N/O
N/O
N/O
Seoul
Beijing9600
64 kb/s
64 kb/s
25.02.1998
64 Kbps
9600
Singapore
2400
MSS History
Teletype Machine Minicomputer (DG S/130) Minicomputer (DG MV/7800)
Alpha DEC 2100 Alpha DEC 40000
PCLSCPCLSC
PCLSC Host
Asynchronous Circuit Support
X.25 Protocol
Dial-in Support
Singapore
Beijing
NWP
Domestinc
Air ForceRoyal Navy
Satellite Subd
Climat Div
New DelhiJeddahHanoiYangon
Forecast div4 Local Forecast Centre
Aero Thai CorpUtapao Airp
Backup DomesticRadar subdivUbon Airp
DMZ Hub
SENT1 FIREWALL
LAN HUB
DEC Alpha 2100standby
MESSAGE SWITCHING
DEC Alpha 4000primary DATABANK
DEC Alpha 4000primary
MESSAGE SWITCHING
DEC Alpha 2100standby
DATABANK
RouterInternet Server
DMZ Hub
SENT2 FIREWALL
Tokyo
Vientiane Beijing
Kuala Lumpur
LAN HUB
Internet
RTH BANGKOK NETWORK
DEC REPEATER#1
DEC SERVER90TL #1
DEC SERVER90TL #2
DEC SERVER90TL #3
DEC SERVER90TL #4
DECHUB 90
Forecast divisionOcean Subdivision
CAT
FRAME RELAYNETWORK
Singapore
Router
DEC Alpha 2100 Server
190MHz Alpha CPU 128MB RAM
8 888
88888888888 8888 8 888 800
- 42 600RRD MB CD ROM Drive
8888888 88888 8888888- 888 888 8888 8888806 4.0 4
8828835
- 07 16006250TSZ AA / bpi reel tape drive
- 500Model A MP R AXP
4000DEC Alpha Server 300MHz Alpha CPU 128MB RAM
8DISK GB
0 0Dual Ethernet Controllers (in , tu )
- 42 600RRD MB CD ROM Drive
8888888 88888 8888888- 888 888 8888 8888806 4.0 4
288 35. MB . ” FD
- 07 16006250TSZ AA / bpi reel tape drive
Software Feature
System software - Digital UNIX version 4.0b
Application Software- Unified Message Switch (UMS)
Message File
Network Definition
History Database
Message DescriptionTable
Message SwitchKernel
WMO Procedure
History DatabaseManagement
WMO AFTN/ICAOMessage Interchage
Control andMonitor
Auto Standby
History DatabaseRetrieval
Validate and Correction
User Terminal
Magnetic tapeInterface
WMO Reporting
Statistics Subsystem
DATABANKSYSTEM
Dial-In Support
Host interfacevia TCP/IPInternetTCP/IP
PC UserSupport
X.25 Protocol
AsynchornouseSupport
COMMUNICATIONCONTROL MESSAGE SWITCHING
SYSTEM CONTROL
Tape
Data FlowControl
UMS Application and Data File Flow
MESSAGE MANAGER
Q TABLE
MESSAGE FILE
QUEUEQ
DEQUEUEENQUEUE
RETRIEVALQueue Management
REQUESTS
MESSAGEMESSAGE
System configuration file
Message Validation and Error Correction
Message RoutingProgram
Message Validation
SMTH01 VTBB 010000AAXX 0100448300 ……….
Route QError Q
MDT
Valid Message
ErrorCorrectionStation
Invalid Message
ChannelQueue
DatabaseQueue
History Database RetrievalTape
History file Message DB Retrieval MESSAGE FILE
Requests
Printer
COMMUNICATION FEATURE
Asynchronous ITA-2, IA-5 ASCII
Synchronous X.25 (1 PVC & 2 PVC)
TCP/IP Frame Relay, WMO standard FTP
Asynchronous ITA-2, IA-5 ASCII
Supports message exchange on asynchronous circuits and communications devices.
Supports character processing for low speed and telegraphic operations. It operates at speed of 50 bauds to 9,600 bps.
Existing circuit : Bangkok-Jeddah, Bangkok-Hanoi, Bangkok-Yangon and Bangkok-New Delhi.
Synchronous X.25 (1 PVC & 2 PVC)Supports message exchange
procedures under X.25 and Fully supported at speed up to 9600 bps.
Supports the message exchange format in GRIB code and BUFR as defined by WMO.
Existing circuit : Bangkok-Singapore and Bangkok-Beijing.
Internet TCP/IP Frame Relay and standard WMO FTPCost-saving and efficiency.Supports numerous application
utilities available off the shelf, which offer solutions to information communication needs of WMO members.
Internet TCP/IP Frame Relay and standard WMO FTP (next)
Provides connectivity between members in a more flexible and versatile manner than base x.25 based equivalent.
New WMO communication technique.
Additional line backup via internet. Existing circuit: Bangkok-Tokyo,
Bangkok-Kuala Lumpur and Bangkok-Vientiane.
Recent development at RTH Bangkok
Hardware updates Software updates Circuit updates
Hardware updatesInternet server for TCP/IP.
Cisco 2600 routers.Sentinet firewalls.
Software updatesWMO socket TCP/IP frame relay module.
WMO FTP standard module.
Circuit updates16 Kbps frame relay for Bangkok-Tokyo circuit.
64 Kbps ftp for Bangkok-Vientiane circuit.
16 Kbps frame relay for Bangkok-Kuala Lumpur circuit.
0
10,000,000
20,000,000
30,000,000
40,000,000
50,000,000
RECEPTION
RECEPTION 23,911,374 5,501,712 3,953,998 1,429,075 527,697 170,619 66,217 464,992 7,024,931 3,476,052 46,526,667
TRANSMISSION 511,054 1,153,373 1,161,395 429,129 4,177,732 649,153 1,228,300 2,068,816 1,837,150 24,255,332 37,471,434
RJTD BABJ DEMS OEJD VNNN VBRR VLIV WMKK WSSS VTBB TOTAL
bytes
Daily Data traffic at RTH Bangkokbytes
Circuit Speed Reception Transmission1RJTD 16 Kbps 11,175 4562BABJ 9,600 1,420 1,3033DEMS 200 683 1,4314OEJD 75 1,171 4175VNNN 1,200 35 3,7336VBRR 50 12 6007VLIV 64 Kbps 4 1,1618WMKK 16 Kbps 1,067 2,7709WSSS 2,400 3,644 2,214
19,211 14,085Totals (bulletins)
Average number of observations bulletins RX/TX within 24 Hrs.
Type of Data BulletinsSynop 4,983Temp 2,031Pilot 438Ship, Buoy, Temp ship, Pilot ship, Bathy,Tesac and Trackof 1,089Airep and Amdar 5,197Satellite 2,925Warnings and Forecasts 194META and TAF 272GRID and GRIB 1,859Others 223
Totals 19,211
Average number of observations received within 24 Hrs.
0
2,000
4,000
6,0008,000
10,000
12,000
14,00016,000
RECE
PTIONRECEPTION 11,175 1,420 683 1,171 35 12 4 1,067 3,644 15,567
TRANSMISSION 456 1,303 1,431 417 3,733 600 1,161 2,770 2,214 14,085
RJTD BABJ DEMS OEJD VNNN VBRR VLIV WMKK WSSS TOTALS
Daily average availability of Rx/Tx bulletins at RTH Bangkok
888888888
Type RJTD BABJ DEMSOEJD VNNNVBRR VLIV WMKKWSSSSynop 1,634 1,035 230 762 26 10 4 27 1,255Temp 1,256 255 60 196 5 0 0 20 239Pilot 74 75 25 4 2 0 0 23 235
Ship, Bathy and Buoy 601 29 346 0 0 0 0 8 105Airep and Amdar 3,662 16 1 0 0 0 0 6 1,512Satellite 2,916 0 3 6 0 0 0 0 0Warnings and Forecasts 86 5 2 6 1 2 0 0 92META, TAF 0 5 0 197 0 0 0 9 61Others 946 0 16 0 1 0 0 974 145
Totals (bulletins) 11,175 1,420 683 1,171 35 12 4 1,067 3,644
Average number of observations bulletins RX within 24 Hrs.
Type RJTD BABJ DEMSOEJDVNNNVBRRVLIVWMKKWSSS
synop 211 610 733 186 895 345 785 1113 1213Temp 50 225 190 57 202 82 269 417 250
Pilot 96 163 147 104 130 100 104 59 59Ship, Bathy and Buoy 21 22 121 32 205 25 0 199 247Airep and Amdar 0 42 87 6 62 0 0 91 55Satellite 0 0 0 01762 0 0 46 45Warnings and Forecasts 8 17 17 32 103 29 1 86 41META, TAF 62 210 68 0 0 0 0 109 52GRID and GRIB 0 0 0 0 360 16 0 641 236
Average number of observations bulletins TX within 24 Hrs.
Circuit Reception Error Duplicate Request
1RJTD 11175 54 1828 1
2BABJ 1420 13 191 0
3DEMS 683 44 221 04OEJD 1171 48 674 05VNNN 35 0 0 16VBRR 12 1 2 07VLIV 4 2 0 08WMKK 1067 0 16 09WSSS 3644 11 389 4
19,211 173 3,321 6 Totals (bulletins)
Average number of observations bulletins RX within 24 Hrs.
Activities BulletinsError data 173Duplicated data 3,321Corrected data 77Requested data from VTBB 10Requested data to VTBB 6New header messages 15
Operator interface at RTH Bangkok
Error analysis for data receiv ed within 2 4 hrs.
Invalid origin 192. % Invalid header 0.2% Invalid date 01. % Missing start/end of message
5.9% Line too long 03. % Unknown WMO header
137. % Duplicate WMO message
60.2%
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z48001 PUTAO MYANMAR - - - - 48004 HKAMTI MYANMAR 50.00 80.00 60.00 - 48008 MYITKYINA MYANMAR 90.00 100.00 70.00 10.00 48010 HOMALIN MYANMAR 90.00 100.00 70.00 - 48018 KATHA MYANMAR 80.00 100.00 70.00 - 48019 BHAMO MYANMAR 90.00 100.00 70.00 - 48020 HAWLAIL MYANMAR 90.00 80.00 70.00 -
48025 KALEWA MYANMAR 90.00 100.00 60.00 - 48035 LASHIO MYANMAR 80.00 50.00 60.00 - 48037 MONYWA MYANMAR 90.00 90.00 70.00 - 48042 MANDALAY MYANMAR 90.00 100.00 70.00 10.00 48045 MINDAT MYANMAR 90.00 80.00 70.00 - 48048 NYAUNG-U MYANMAR 90.00 100.00 70.00 - 48053 MEIKTILA MYANMAR 90.00 80.00 60.00 10.00 48057 TAUNGGYI MYANMAR - 80.00 30.00 - 48060 KENGTUNG MYANMAR - 90.00 70.00 - 48062 SITTWE MYANMAR 90.00 80.00 70.00 10.00
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z
48071 KYAUKPYU MYANMAR 90.00 100.00 70.00 - 48077 PROME MYANMAR 70.00 100.00 70.00 - 48078 TOUNGOO MYANMAR 60.00 90.00 70.00 - 48080 SANDOWAY MYANMAR 70.00 90.00 20.00 - 48094 PATHEIN MYANMAR 80.00 40.00 60.00 - 48097 YANGON MYANMAR 90.00 100.00 70.00 30.00 48108 DAWEI MYANMAR 90.00 90.00 60.00 10.00 48109 COCO ISLAND MYANMAR - 90.00 40.00 - 48110 MERGUI MYANMAR - 60.00 70.00 - 48112 VICTORIA POINT MYANMAR - 20.00 60.00 -
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z
48802 SAPA VIET NAM 100.00 70.00 80.00 80.00 48803 LAO CAI VIET NAM 100.00 80.00 80.00 80.00 48806 SONLA VIET NAM 100.00 80.00 80.00 80.00 48808 CAO BANG VIET NAM 90.00 80.00 80.00 70.00 48810 BAC CAN VIET NAM 100.00 80.00 80.00 80.00 48820 HA NOI VIET NAM 100.00 90.00 80.00 80.00 48823 NAM DINH VIET NAM 100.00 80.00 80.00 80.00 48826 PHU LIEN VIET NAM 100.00 90.00 80.00 80.00 48830 LANG SON VIET NAM 100.00 80.00 80.00 80.00 48831 THAINGUYEN VIET NAM 100.00 80.00 80.00 80.00
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z
48838 MONG-CAI VIET NAM 100.00 80.00 80.00 80.00 48839 BACHLONG VI VIET NAM 100.00 90.00 70.00 80.00 48840 THANH HOA VIET NAM 100.00 80.00 80.00 80.00 48845 VINH VIET NAM 90.00 90.00 80.00 80.00 48846 HATTINH VIET NAM 100.00 80.00 80.00 80.00 48848 DONG HOI VIET NAM 100.00 90.00 80.00 80.00 48852 HVE VIET NAM 100.00 80.00 80.00 80.00 48855 DA NANG VIET NAM 100.00 90.00 80.00 80.00 48863 QUANG-NGAI VIET NAM 100.00 80.00 80.00 80.00 48866 PLEIKU VIET NAM 90.00 80.00 80.00 80.00
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z
48870 QUY NHON VIET NAM 100.00 90.00 80.00 80.00 48875 BUONMATHUOT VIET NAM 90.00 80.00 80.00 70.00 48877 NHA TRANG VIET NAM 100.00 90.00 80.00 80.00 48887 PHAN THIET VIET NAM 100.00 90.00 80.00 80.00 48892 SONG TU TAY VIET NAM 100.00 70.00 80.00 80.00 48900 HO CHI MIN VIET NAM 100.00 90.00 80.00 80.00 48907 RACH GIA VIET NAM 100.00 80.00 80.00 80.00 48914 CA MAU VIET NAM 100.00 90.00 80.00 80.00 48916 THO CHU VIET NAM 80.00 80.00 80.00 60.00 48917 PHU QUOC VIET NAM 100.00 90.00 80.00 80.00
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z
48918 CON SON VIET NAM 100.00 90.00 80.00 80.00 48919 HUYEN TRAN VIET NAM 100.00 80.00 80.00 80.00 48920 TRUONG TRAN VIET NAM 100.00 90.00 80.00 80.00 48921 BOUNNEUA LAOS 20.00 50.00 - - 48924 LUANG NAMTHA LAOS 70.00 90.00 - - 48925 OUDOMSAY LAOS 80.00 90.00 - - 48926 HOVEI-SAI LAOS 30.00 100.00 - - 48927 VIENSAY LAOS 50.00 80.00 - - 48928 SAM-NEUA LAOS 50.00 40.00 - - 48930 LUANG-PRABANG LAOS 80.00 100.00 - -
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z
48935 PLAINE DES JARRES LAOS 80.00 100.00 - - 48938 SAYAROURY LAOS 80.00 90.00 - - 48940 VIENTIANE LAOS 80.00 100.00 - - 48941 PHONHONG LAOS 40.00 60.00 - - 48944 THANGONE LAOS - 10.00 - - 48945 TAKSANE LAOS 80.00 90.00 - - 48946 THAKHEK LAOS 80.00 90.00 - - 48947 SAVANNAKHET LAOS 80.00 90.00 - - 48948 SENO LAOS 40.00 70.00 - - 48952 SARAVANE LAOS 30.00 60.00 - -
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z
48953 SEKONG LAOS 40.00 30.00 - - 48955 PAKSE LAOS 80.00 100.00 - - 48957 ATTOPEU LAOS 10.00 30.00 - - 48962 BATTAMBANG CAMBODIA - - - - 48966 SIEMREAP CAMBODIA - - - - 48968 KRAKOR CAMBODIA - - - - 48982 KOS KONG CAMBODIA - - - - 48983 KOMPONG SOM/VILLECAMBODIA - - - - 48985 KAMPOT CAMBODIA - - - - 48991 PHOM-PENH CAMBODIA - - - -
Percentage of monitoring results for Southeast Asia : SYNOP (monitoring period : 21 August 2002 - 30 August 2002)
station name country 00z 06z 12z 18z
8 888888 8 888 88888mendationsSilent centreGarbled messageRepeated sendingQuality message formatConnection failed Automatic request/replyFinancial support for
developing country.