THE PACKET RADIO TECHNOLOGY IMPLEMENTED
IN THE INDONESIAN COMPUTER NETWORK

Onno W. Purbo
Inter University Center on Microelectronics
Institute of Technology Bandung
Bandung 40132
INDONESIA
Tel: 62-22-250-1895
FAX: 62-22-438-338
Email: yc1dav@itbgtw.itb.ac.id

ABSTRACT

		In this paper, the packet radio technology implemented in building the Indonesian computer network will be reviewed. The current packet radio equipments used in the system are mainly running at 1200bps and 9600bps. Effort to increase the long distance regional packet radio backbone to higher speed (56Kbps and 125Kbps) as well as the high speed packet technology used will be presented. Some of the future plans comprising several agencies involving long distance HF transmission as well as data transmission via satellite will be described. Transmission Control Protocol/InterNet Protocol (TCP/IP) protocol will be discussed. It is used to integrate the network that opens the possibility to integrate into a wider international InterNet network.

SUMMARY

	In this paper, we reviewed the packet radio technology used in our packet radio computer network connecting various universities, research institutions and some commercial companies in Jawa Islands. The current technology is based on the commercially available 1200bps and 9600bps packet radio technology. It is operated in VHF and UHF bands.
	To increase the capability of our long distance regional back bone, we are currently developing 56Kbps and 125Kbps packet radio equipments. It uses Minimum Shift Keying (MSK) with I/Q modulator in the modulator side. An ordinary FM receiver chip is used in the receiver side prior to data recovery and detection. About 50-60 times improvement in performance from the existing system is expected by using the high-speed packet radio computer network.

ACKNOWLEDGMENT

	The author would like to acknowledge many of his colleagues involved in the development of packet radio computer network in Indonesia, including Adi Indrayanto (ITB), Hari Satryo Basuki (LIPI), Adrianti PST (LAPAN), M. Ichsan (LAPAN), RMS Ibrahim (UI) and the students at ITB.
	I would like to thank Dr. Soegiardjo Soegjoko for his encouragements and supports during the course of the work and writing of this paper.