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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 />

11

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