Transcript An example of progress in data serving through the Internet

Status on RTH Tokyo
(Item 2.1)
Expert Meeting on the Exchange of Early Warning and Related
Information Including Tsunami Warnings in the Indian Ocean
(Jakarta, Indonesia, 16-18 March 2005)
By Hiroyuki Ichijo
1. Status of RTH Tokyo
1.1 GTS links connected with RTH Tokyo
MTN link
Regional link
Strategy 1:
Migration to TCP/IP
(Progress status) Completed
Strategy 2:
Seeking cost-effectiveness with
high reliability
(Progress status) 8 of nine links
have already migrated to FR. The
latest annual availability of those
links are over 99.998%
Khabarovsk
Washington
Beijing
Seoul
Tokyo
New Delhi
Hong Kong
Bangkok
Manila
Melbourne
1.2 Detailed configuration of the GTS links
64kbps
HKT
Frame Relay
Network
Hong Kong
64kbps
Seoul
KDDI
Frame Relay
Networks
DACOM
Frame Relay
Network
64kbps
PLDT
Frame Relay
Network
Manila
CAT
Frame Relay
Network
128kbps
Bangkok
NNI basis Frame Relay
connections
192kbps
Tokyo
128kbps
14.4
-28.8
kbps
Khabarovsk
Leased line
1.5Mbps
Equant
Frame Relay Network
64kbps
New Delhi
128kbps
Beijing
IMTN cloud II (Seamless
Network by a single provider)
BT
Frame Relay Network
256kbps
Melbourne
1.5Mbps
Washington
IMTN cloud I (Seamless
Network by a single provider)
1.3 Example of traffic conditions (Washington-Tokyo MTN link)
Tokyo to Washington (7 April 2004)
4000
[MBytes/20min.
]
21 Mbytes/day
3
FAX
BIN
AN
2
CIR=32kbps
CIR=768kbps
1
Tokyo
0
00
03
06
09
12
15
18
21
1.5Mbps
[UTC]
1.5Mbps
• Asymmetric bandwidth
(different CIRs) suitable
for typical unbalanced
traffic
40
File
30
FAX
BIN
• Capability of burst file
transfer for enormous
volume of satellite data
AN
20
292kbps line
(38% of CIR)
10
0
00
Washington
• Cost-effective FR link
Washington to Tokyo (7 April 2004)
[MBytes/20min.]
10000
50
FR
974 Mbytes/day
03
06
09
12
15
18
21
[UTC]
1.4 Message Switching System (MSS)
• The current MSS has a function of priority transmission with 5 level
priorities. Urgent Messages such as Tsunami Warning Information
are transmitted with a highest priority.
• The current MSS has addressed message (BM) functions such as
forwarding a BM to an appropriate adjacent center, request/reply and
notifying MSS operators of an incoming BM addressed to RJTD.
• The current MSS will be replaced by new one in October 2005. The
new one takes over fundamental GTS functions.
Earthquake &
Tsunami System
MSS for GTS
(RJTD)
BMBB01 RJTD YYGGgg
DEMS
… QSL for Tsunami
Warning Information …
Manual
operation
2. Internet connectivity in JMA HQ
Internet
ISP #1
Lately the Internet is indispensable for
data retrieving/serving in meteorological
community.
JMA reinforces the Internet connection
system and data serving services every
year.
ISP #2
20Mbps
10Mbps
Multi-homed
connections
for reliability
Packet Shapers
Router Controllers
Firewalls
Load Balancer DMZ
JMA
Secure Zone
(Intranet)
FTP Servers Public Servers