tec.News - Harting
tec.News - Harting
tec.News - Harting
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Germany<br />
MII's main task is to synchronise<br />
the developments taking place in<br />
the electronics industry with the<br />
China<br />
(Fig. IBM)<br />
changes in and requirements of<br />
the telecommunications industry.<br />
In all the phases mentioned China<br />
used the most modern <strong>tec</strong>hnologies<br />
available and in some cases<br />
whole generations of <strong>tec</strong>hnology<br />
were skipped.<br />
SIGNAL TRANSMISSION<br />
AND NETWORKS<br />
China's geographical size (almost<br />
10 million square kilometres, equivalent<br />
to 27 times the size of Germany,<br />
for example) was one of the<br />
great challenges in the modernisation<br />
of the telecommunications<br />
network. Three different <strong>tec</strong>hnologies<br />
were used for main trunk<br />
lines: fibre optic, microwave and<br />
satellite systems.<br />
Forty satellite receiving stations<br />
now maintain links with the 17 satellites<br />
in orbit. An approx. 200,000<br />
kilometre fibre optic trunk line<br />
network based on SDH (Synchronous<br />
Digital Hierarchy) transmission<br />
<strong>tec</strong>hnology permits bit rates of 622<br />
Mbps and 2.5 Gbps. A 100,000 kilometre<br />
distribution network was<br />
also laid and 140,000 microwave<br />
connections installed. At present<br />
(Fig. Dornier)<br />
the public dial-up telephone network<br />
in China comprises 135 million<br />
subscriber lines with 4.8 million<br />
local exchanges distributed<br />
throughout the country.<br />
CELLULAR TELEPHONE<br />
SERVICE<br />
Parallel to the line connected telephone<br />
system, at the end of the<br />
eighties China also built up mobile<br />
telephone networks. The first<br />
analog cellular network was put<br />
into operation in 1987 in Guangdong<br />
province. There are now 25<br />
million mobile telephone subscribers<br />
in China, and it is assumed<br />
that this number will rise to 50<br />
million by the year 2005.<br />
All 31 provinces have been covered<br />
in the meantime. The prevailing<br />
<strong>tec</strong>hnology is currently the digital<br />
GSM system, though it has recently<br />
been decided to build up a competing<br />
network based on CDMA<br />
<strong>tec</strong>hnology.<br />
THE INTERNET<br />
AND DATA TRANSFER<br />
The Internet age dawned in China<br />
in 1995 under the name of CHINA-<br />
NET. Initially connection was restricted<br />
to business subscribers<br />
People Power Partnership<br />
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