1. Status on RTH Tokyo (Item 2.1) By Hiroyuki Ichijo By Hiroyuki Ichijo Expert Meeting on the Exchange of Early Warning and Related Information Including Tsunami Warnings in the Indian Ocean (Jakarta, Indonesia, 16-18 March 2005)

2. 1. Status of RTH Tokyo 1.1 GTS links connected with RTH Tokyo 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% Tokyo Manila Bangkok New Delhi Beijing Hong Kong Khabarovsk Seoul Melbourne Washington MTN link Regional link

3. 1.2 Detailed configuration of the GTS links WashingtonMelbourne Bangkok Hong Kong 192kbps 64kbps NNI basis Frame Relay connections 128kbps KDDI Frame Relay Networks Seoul DACOM Frame Relay Network HKT Network CAT Network Khabarovsk 14.4 -28.8 kbps Manila Leased line IMTN cloud I (Seamless Network by a single provider) BT Frame Relay Network Frame Relay Network 1.5Mbps 256kbps 1.5Mbps BeijingNew Delhi IMTN cloud II (Seamless Network by a single provider) Equant Frame Relay Network Frame Relay Network 128kbps 64kbps Tokyo 128kbps PLDT Frame Relay Network 64kbps

4. 1.3 Example of traffic conditions (Washington-Tokyo MTN link) Cost-effective FR link Asymmetric bandwidth (different CIRs) suitable for typical unbalanced traffic Capability of burst file transfer for enormous volume of satellite data 50 10000 0003060912151821 File FAX BIN AN [MBytes/20min.] [UTC] Washington to Tokyo (7 April 2004) 40 30 20 10 0 974 Mbytes/day 0 1 2 3 4000 0003060912151821 FAX BIN AN [UTC] Tokyo to Washington (7 April 2004) [MBytes/20min. ] 21 Mbytes/day 292kbps line (38% of CIR) CIR=32kbps CIR=768kbps Tokyo FR Washington 1.5Mbps

5. 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. BMBB01 RJTD YYGGgg DEMS … QSL for Tsunami Warning Information … MSS for GTS (RJTD) Earthquake & Tsunami System Manual operation

6. 2. Internet connectivity in JMA HQ DMZ JMA Secure Zone (Intranet) ISP #1 Router Controllers Firewalls Packet Shapers Load Balancer 20Mbps Internet FTP Servers Public Servers ISP #2 10Mbps Multi-homed connections for reliability Lately the Internet is indispensable for data retrieving/serving in meteorological community. JMA reinforces the Internet connection system and data serving services every year.