AI 3 Satellite Link Monitoring Architecture Kouji OkadaKeio

The presentation summary • The problem of satellite links • The architecture of satellite

The problem of satellite links • Ku-band – rain attenuation • C-band – sun

The problem of satellite links(cont. ) • Satellite operation needs the monitoring – the

The architecture of satellite network operation • On layer 3 – routing daemon status,

Modem Watch Dog • How MWD works – Get the modem status automatically –

The system design • Modem controller – work on the satellite gateways – send

The system design(cont. ) annthena Satellite Modem Data Serial line Router Browser Control Serial

Environment • • Free. BSD-4. x-release Mysql-3. 23. 36 perl php-3. 0. 18 gd-1.

Future Works • Adapt MWD to – NEC Nextar – CM 701 – UDLReceiver

Conclusion • Design the architecture of monitoring • Implementation of MWD • Evaluation –

URL • http: //mwd. sfc. wide. ad. jp/ • http: //www. sfc. wide. ad.

Slides: 12

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AI 3 Satellite Link Monitoring Architecture Kouji Okada(Keio Univ. ) okada@sfc. wide. ad. jp

The presentation summary • The problem of satellite links • The architecture of satellite network operation • The overview of MWD • Future works

The problem of satellite links • Ku-band – rain attenuation • C-band – sun interference • Sometimes satellite links go down

The problem of satellite links(cont. ) • Satellite operation needs the monitoring – the high cost of watching satellite links all through the time • human resources • economical cost(leased line) – the inconvenience to search necessary data from working diary • we designed the layered monitoring architecture

The architecture of satellite network operation • On layer 3 – routing daemon status, routing table, ICMP echo request/reply • On layer 2 – interface(sr 0) up/down status, modem sync • On layer 1 – Receive Signal Level, Eb/N 0

Modem Watch Dog • How MWD works – Get the modem status automatically – Show us the current situation of satellite link on the web page • you can see the status of modems every time everywhere as you wish – Store the necessary data for our operation to the database

The system design • Modem controller – work on the satellite gateways – send the commands to the modems • mwdd – work on the MWD server – get data from controller and store them into the database • WWW(PHP) – work on the MWD server

The system design(cont. ) annthena Satellite Modem Data Serial line Router Browser Control Serial line Modem Controller mwdd httpd snmpd script DB

Environment • • Free. BSD-4. x-release Mysql-3. 23. 36 perl php-3. 0. 18 gd-1. 8. 3 apache-1. 3. 12 ucd-snmp-4. 2. 1

Future Works • Adapt MWD to – NEC Nextar – CM 701 – UDLReceiver • make MWD to let us know the trouble occurrence → e-mail • Define MIB for satellite modems • Complete the implementation of this monitoring architecture

Conclusion • Design the architecture of monitoring • Implementation of MWD • Evaluation – MWD reduce the burden of satellite operation – through the Internet you can see the modem status from anywhere any time – you can search data as you need • Some co-worker for entire AI 3 satellite stations monitoring

URL • http: //mwd. sfc. wide. ad. jp/ • http: //www. sfc. wide. ad. jp/~okada/mwd 20010109 beta. tar. gz