Volume 8 – Mechanical and Electrical Services - Malaysia Geoportal

Chapter 10 SCADA AND AUTOMATION SYSTEM
d) EDGE
Enhanced Data rates for GSM Evolution (EDGE) or Enhanced GPRS (EGPRS), is a digital
mobile phone technology that allows increased data transmission rates and improved data
transmission reliability. Although technically a 3G network technology, it is generally
classified as the unofficial standard 2.75G, due to its slower network speed. EDGE has been
introduced into GSM networks around the world since 2003, initially in North America. EDGE
can be used for any packet switched application, such as an Internet connection.
e) 3G
High-Speed Downlink Packet Access (HSDPA) is a 3G (third generation) mobile telephony
communications protocol in the High-Speed Packet Access (HSPA) family, which allows
networks based on Universal Mobile Telecommunications System (UMTS) to have higher
data transfer speeds and capacity. DID starts to implement 3G in SCADA communication in
recent years. Anyway, due to 3G coverage over Malaysia is still limited, implementation of
this communication method is still not popular.
f) Broadband
Streamyx is the one of the most popular internet broadband service provider in Malaysia
which had been wisely used by DID in recent year for SCADA communication. It is mostly
implemented in communication between SCADA server with RTU or SCADA client. For
SCADA server a fix IP needs to be implemented so that RTU at each site can update the data
to server from time to time. Anyway, the server can also function without fix IP by using
redirecting from others server so call “No IP” server.
Global System for Mobile Communications Network GSM Network shall be utilized as Main link for
communication through suitable GSM/GPRS/3G MODEM module due to their reliability, role against
lightning strike and speed of transmition. For network Camera, streamyx shall be used as a main
communication media between installations sites Master SCADA Server at Level 3. The modem must
also be cooperated with alert system to send SMS to the users during critical event and reply the
user with latest site information whenever the user request through SMS. In other worlds, only 1
GSM/GPRS/3G modem allowed to be installed at 1 site. The GSM/GPRS/3G MODEM Equipment used
shall be versatile, sensitive, reliable and able to operate for long hours at stand-by mode.
As a result of fast technological advancement in the electronic/communication fields, the above
mentioned systems will be expected to be replaced with the latest technology in a short period,
which the users of this manual have to be aware of.
10.4.3 Level 3
Level 3 content SCADA Server which usually placed at the administration office is configured to
upload data from Level 1 at scheduled interval. In this case, all remote sites data are collected and
store in the server through Level 2. The server also provides monitoring information for each site.
The main tasks of Level 3 are presenting gate information and data storage. It chunks data, displays
information; views live image, present report and achieves history data. Lastly additional viewing
client is allowed to login into site front end processor with permission from authority.
10-14 March 2009