Worldwide Report Telecommunications Policy, Research and Development No. 93

JPRS 74311
4 October 1979

Worldwide Report

TELECOMMUNICATIONS POLICY,
RESEARCH AND DEVELOPMENT

No. 93

[FBIS] FOREIGN BROADCAST INFORMATION SERVICE

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15 Supplementary Notes

16. Abstract (Lema 2700 words)

This serial report contains information from the world press and radio relating
to worldwide political, economic and technical developments in telecommunications
computers, and satellite communications. Coverage will be worldwide with focus
on France, Federal Republic of Germany, United Kingdom, Italy, Japan, the USSR,
People's Republic of China, Sweden, and the Netherlands.

- —-

17. Mecument Analysis @ Oescriptors

Wor ldwide

Computers

Satellite Communications

Electronics and Electrical Engineering
Telecommunications

Telemetry

b Identitiers/Open Ended Terms

c. COSAT! Fieia/Group OFB, C, F, 17B, 22B

“Unlimited Availability * UNCLASSIFIED |" "25
Sold by NTIS 20. Security Cless (This Pege) tis Price
Soringfield, Virginia 22161 UNCLASSIFIED =

(See ANS\-239.18) See instructions on Reverse pte a arn

Department of Commerce

JPRS 74311
4 October 1979

WORLDWIDE REPORT
TELECOMMUNICATIONS PoLIcy, RESEARCH AND DEVELOPMENT

No. 93

CONTENTS PAGE

WORLDWIDE AFFAIRS
"INDIAN EXPRESS' Editorial on Significance of World Radio
Conference
(Editorial; INDIAN EXPRESS, 17 Sep 79)...ceccccsccccccees 1

Briefs
Postponement of WARC Opening 2

ASIA
INTER-ASIAN AFFAIRS

Australian Firm To Lay Indian Ocean Telephone Cable
(THE AUSTRALIAN, 27 Aug TI cccccccccccccecceececeececeees 3

AUSTRALIA

Request for Tender on Communications Network Released
(THE AUSTRALIAN, 27 Aug » ) PETULITILILILTTTTTTTrrrereyrrrerreee 4

BRUNEI

Telisai Earth Station To Begin Operations
(BORNEO BULLETIN, 28 Jul +) PYYTTTTTLILILITELETTTTTTTrTeTeT 5

PEOPLE'S REPUBLIC OF CHINA
Briefs

Zhejiang Submarine Cables
Macao-Canton Communications Talks

on

-a- [III - WW - 140)

CONTENTS (Continued)

EAST EUROPE
BULGARIA

Japanese Minister of Communications Visits
(Yana Kons cantinova; IMPULS, 31 Jul Fepoocese eeneesee

HUNGARY

Hungarian Remote Data Processing, System Tested in USSR
(Szilard Sass, Mihaly Koves; MUSZAKI OZLEMENYEK,

No 2, BOE 0000005000000 060S0S00SS60SS0 OSS CCE ESE

Successful Development at Communications Factory
(Peter Eisler Interview; MUSZAKI KOZLEMENYEK,

No 2, i, ) PPPUTTTTTTTTTTTTTTTTTTTTTTiTTTrreyrrreeyTrrTyee

The GTT 8000/960 Microwave Radio Relay Equipment
(Andras Somogyi, Attila Deak; MUSZAKI KOZLEMENYEK,
No Ze Ly ) POPU TTTTTPTTTTTTTTTTTTTTrTresrereyyrrrrirrT ee
NEAR EAST AND NORTH AFRICA
TUNISIA

Paper Comments on Planned Geneva World Radio Conference

(TAP, 18 Sep TD) 0000000 0000000 0000000000000 0000 COCs

SUB-SAHARAN AFRICA

ETHLOPIA

Briefs
Radio Terminal

Page

12

17

22

23

WORLDWIDE AFFAIRS

"INDIAN EXPRESS" EDITORIAL ON SIGNIFICANCE OF WORLD RADIO CONFERENCE
Delhi INDIAN EXPRESS in English 17 Sep 79 p 6 BK
[Editorial: "Sharing Radio Waves"™]

[Text] India has done well to ask for an equitable distribution of geo-
stationary satellite orbit space and frequency assignments in its propo-
sals for the forthcoming World Administrative Radio Conference (WARC-79),
due tv begin in Geneva on September 24. This is only one among the
several controversial aspects of the existing framework for use of the
radio spectrum by various services in the 154 member-countries of the
Internati ynal Telecommunication Union (ITU).

When the existing guidelines were decided at the 1959 session of WARC,
most developing countries were unaware of the potential of a rapidly
growing communication technology and their future requirements. Hence,
there was little protest from them when the developed countries pushed
through the “first come first served" principle for use of geostationary
satellite frequencies and orbit space. As a result, the geostationary
orbit has become crowded by satellites of advanced countries, while the
developing countries, who are now keen to launch their own communication
satellites, are finding it hard to get their due share. For instance,
India has had to cut down the emission power of its geostationary satel-
lite planned for 1981 so as not to disturb the transmissions from
satellites or developed countries already in existence.

This is why considerable significance is being attached to WARC-79 by
the developing countries who, for the first time, constitute an over-
whelming majority in the ITU. What is more, they will not have another
chance to seek a change in the radio spectrum framework till 1999, when
the mext WARC is to be held.

Similarly, India's demand for expansion of shortwave broaccast bands

will be shared by most developing countries as radio has become the cheap-
est means for propagating information and ideas. The other proposals on
sharing of ultra high frequency bands for television networks and addi-
tional frequencies for radio astronomy are also important.

CSO: 5500 1

WORLDWIDE AFFAIRS

BRIEFS

POSTPONEMENT OF WARC OPENING--Geneva, Sept 24, (AFP)--The scheduled opening
here today of the World Administrative Radio Conference (WARC) has been
postponed because of failure to agree on a chairman. Delegation hezds
will meet on Wednesday to try to settle the problem. There are three can-
didates for chairman: T. V. Srirangan (India), Derek Rose (New Zvaland),
and Henry Kieffer (Switzerland). The deadlock is believed to be the work
of the non-aligned countries, who want Mr Srirangan for chairman. He is,
however, understood to be opposed by the industrialized countries. The
10-week conference aims at redistribution of airwaves. [Text] [Paris AFP
in English 1844 GMT 24 Sep 79 NC]

CSO: 5500

INTEL-ASIAN AFFAIRS

AUSTRALIAN FIRM TO LAY INDIAN OCEAN TELEPHONE CABLE

Canberra ThE AUSTRALIAN in English 27 Aug 79 p 13

[Text ]

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CSO:

AUSTRALIA

REQUEST FOR TENDER ON COMMUNICATIONS NETWORK RELEASED

Canterra THE AUSTRALIAN in English 27 Aug 79 p 13

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[Text ]

5500

CSO:

PEOPLE’S REPUBLIC OF CHINA

BRIEFS

ZHEJIANG SUBMARINE CABLES--Three 130-kilometer-long submarine cables have
been laid recently between Wenzhou anc Dongtou. The cables, linking the
continent with four coastal islands, have improved communications in the
area. A PLA unit assisted in the project. [Hangzhou Zhejiang Provincial
Service in Mandarin 1100 GMT 20 Aug 79 OW]

MACAO-CANTON COMMUNICATIONS TALKS--A Macao government delegation, headed

by Eng Aires da Silva, will shortly be going to Canton to discuss with the
regional authorities there the possibilities for improving telegraph and
telephone links between the province and the Portuguese territory. The
delegation will also be holding talks with the Chinese authorities,
envisaging the study of ways and means of cooperation in telecommnications,
taking into account the substantial increase--amounting to some 300 percent--
in the telegraphic traffic between the two regions. An improvemer: in the
communications link between Macao and Canton will come following the commis-
sioning, on 1 August, of direct links via satellite between Portugal's

far eastern territory and Shanghai and Beijing. [Text] [Lisbon Radio

in Portuguese to Eu’ ope 1230 GMT 15 Aug 79 LD]

CSO: 5500

BULGARIA

JAPANESE MINISTER OF COMMUNICATIONS VISITS
Sofia IMPULS in Bulgarian 31 Jul 79 p 1

[Article by Yana Konstan’ va: “Bulgarian-Japanese Cooperation in Com-
munications" ]

[Text] Japanese Mini: * Communications Received by Comrade Todor
Zhivkov

The Chairmar of the State Counc!1, Todor Zhivkov, on 26 July 1979 received
the Japanese minister of posts and telecommunications Nikichi Shirahama
who was on a friendly visit to our nation upon the invitation of the minis-
ter, Engr Pando Vanchrv.

During the meeting there was a discussion of the possibilities of expanding
profesrional contacts an” cooperation between the two countries in the area
of communications.

The meeting was attended by the minister Engr Pando Vanchev, as well as by
the ambassadors of Bulgaria and Japan, Todor Dichev and Akiro Yamato.

Bulgarian-Japanese Cooperation in Communications

Upon the invitation of tne minister of communications, Engr Pando Vanchev,
a friendly visit was paid to Bulgaria by the Japanese minister of posts
and telecommunications Nikichi Shirahama accompanied by co-workers and a
group of journclists from the Japanese mass information media.

At the conversations held between the delegat' ons of the two ministries, {
emphasis wes put on their reciprocal desire to establish closer contacts,

and to make communications a reliable bridge for the constantly broadening

friendly ties between Bulgaria and Japan in the economy, culture and other

areas of life.

The minister, Engr Pando Vanchev, expressed sincere satisfaction from this
first visit by a Japanese minister of posts and telecommunications to

Bulgaria and defined it as a step ahead in the development of undoubtedly
useful relations between the two similar ministries, and that this is in
accord and with the desire of the governments of the two countries to co-
operate more actively. He described the structure and organization of the
communications system in Bulgaria over the immediate and longer-run periods
of its development, as well as certain problems and tasks presently con-
fronting communications. The Japanese minister N. Shirahama began his
speech with thankful words for Bulgarian hospitality. In pointing to the
high dynamics in the development of Bulgarian-Japanese relations, he em-
phasized the leading role of communications as a means for maintaining and
extending friendly and professional contacts.

Mr Shirahama expressed thanks for the opportunity granted him to become
acquainted with the activities and problems of communications in Bulgaria,
and stated his readiness to assist in a closer rapprochement between the
two ministries and the two countries, as well as in direct and mutually
advantageous cooperation, the opportunities for which in the area of com-
munications were discussed at this meeting.

The talks were attended by the ambassadors of Bulggria and Japan, Todor
Dickev and ikiro Yamato.

Mr Shirhama and the persons accompanying him visited the Kopitoto area
near Sofia where a radio-television center is being built, and he inspected
certain important sites in our capital.

The Japanese journalists had meetings at the Sofia Press Agency and at the
Union of Bulgarian Journalists.

Prior to his departure from Bulgaria, at the Sofia air terminal, Mr Nikichi
Shirahama stated:

"I em very pleased by the warm and sincere hospitality which your minister
of connunications and his co-workers have shown us.

"I am particularly happy that I had an opportunity to meet with and be re-
ceived by the chairman of the State Council of your country, Mr Todor
Zhivkov. I am exceptionally happy and pleased by the fact that during

our talk I felt his great confidence and friendly feelings for Japan and
the Japanese people and a sincere desire for cooperation.

"Your country is very beautiful. I was enchanted by Mt Vitosha which we

visited.

"In leaving, I take with me the most lovely impressions of Bulgaria."

10272
‘SO: 5500

HUNGARY

HUNGARIAN REMOTE DATA PROCESSING SYSTEM TESTED IN USSR

Budapest MUSZAKI KOZLEMENYEK in Hungarian Vol 25 No 2, 1979 pp 83-85

[Article by Szilard Sass and Mihaly Koves, TERTA (Telephone Factory) ]

[Summary] "Computer-technology development at TERTA advanced by a major
step in October 1978: by completing the data-transmission multiplexer
prototypes it became possible to create complete remote data-processing
subsystems. After completion of the factory tests, the next step was an
interministry test set up by the Soviet users. The USSR was the obvious
site for the testing since TERTA has so far sold almost 2,000 terminals
to the USSR. Among these was the TAP-2 (EC 8502) dialog batch terminal,
of which the 1000th was delivered in 1978. The goal of the tests was to
demonstrate the complex system made up of many types of terminal, to
demonstrate the operation via actual communications channels, and to
demonstrat. the run of typical user programs, and at the same time to
exhibit the multiplexor and terminal test programs developed at TERTA.
The diagram shows the design of the tested system."

"The TERTA DOSzTOD remote data-processing system operated with the R-22
computer in a Soviet computer center under the control of the EC/DOS
(BTAM) operating system.This article discusses only the system as a whole,
the TMX-2410 multiplexor (which is a new development), the TETA-1210 and
TETA-1220 group line wnits, and the TAP-X terminal, since the other de-
vices are already known to the readers of this journal."

"In the first part of the test, individual devices and sectors of the
System (such as the multiplexor, line couplings, communication channels,
and terminals) were checked, partly from the engineering consoles of the
devices and partly with the aid of the test programs developed for this

purpose."

"During the second stage, the performance of the three user program systems
demonstrated the usefulness of the system. It can be seen from the diagram
that the system includes TAP-2, TAP-3, TAP-70, TAP-X, and AP-64 terminals.
Most of these have already been installed earlier (for example, it is a
well-known fact that the state data transmission system of the USSR is based
on TAP-2 terminals). It thus became possible to use it in conjunction with
various such terminals which, according to the original plans, was not part
of the actual test."

"The TAP-X micrporocessor-containing termina] is a new product of TERTA.
The version that was exhibited operates on the basis of the TAP-70 al-
gorithm, and was equipped with an alphanumeric keyboard, 1600-character
display, matrix printer, perforated-tape reader, and floppy disk. As a
result of the microprocessor-based electronic system it became possible
to solve user problems in the autonomous operating mode."

The terminals communicated with the computer via various communication
channels. In Kiev there were two TAP-2 terminals operating at the rate of
200 bits per second, connected via two-wire leased telephone channel to
the remote TMX-2400 multiplexor installed in Kiev. The remote multiplexor
was connected to its adapter via a leased four-wire telephone channel (the
remote multiplexor is capable of bundling up to 22 data-transmission chan-
nels at a rate of 50 bits per second) ."

"Another group of TAP-2 terminals operated via 200 Baud telegraph networks
switched with PD-200. The terminals included in the test were located in
Moscow, Kiev, and Tyumen."

"The third group of terminals was connected to the computer via the switched
telephone network of Moscow. This group incouded TAP-2, TAP-3, TAP-70, and
TAP-X terminals"

"In addition to terminals from TERTA, the system also included the AP-64
terminal from ORION. Connection to the multiplexor was provided by a
four-wire leased telephone channel, using TERTA's TAM-603 full duplex modem."

"The line devices (TAM-201, TAM-601, and TAM-603 modems; TBA-1 automatic
calling units, telegraph-line connectors and error protectors combined
with the TTX-201 automatic calling unit) were built in groups. The func-
tionally individual subassemblies may be used in their own right or in
groups.The TETA-1210 and TETA-1220 group line units have a common supply
unit and an engineering console permitting joint testing."

10

"The main feature of the test was the microprocessor-based data-transmission
multiplexor made by TERTA."

"The system may be connected to medium and large-size ESER computers (from
the R-20 and higher) and other computer systems with compatible channel
(such as the IBM 360 and 370 systems). The connection is made to the mlti-
plex channels of the computers. The two-channel switch permits connection
to two multiplex channels also."

" The system test was carried out in two parts. The first part involved the
checking of the multiplexor and the terminals for proper operation, using
test sections. The second part involved the operation of the user programs
operating under the DOS 2.2 operating system.

"Three user programs were run in the course of the test and the demonstra-
tion following the test. Each program executed the data interchange with
the terminals with the aid of the ESER BTAM."

"The tests demonstrated the operability of the system. The simultaneous
operation of the terminals was of interest. Obviously, greatest interest
was shown in the local multiplexor and the microprocessor-based terminal."

"The equipment was submitted to the two major Soviet ministries concerned
for experimental operation. TERTA demonstrated with this test that it is
ready and able to act as a prime contractor for producing remote data-
processing systems."

2542
CSO: 5500

[Diagram on p 84]

Fig. 1. The configuration tested
Key: 1 - Switched telegraph network
2 - Moscow cuty telephone network

ll

HUNGARY

SUCCESSFUL DEVELOPMENT AT COMMUNICATIONS FACTORY

Budapest MUSZAKI KOZLEMENYEK in Hungarian Vol 25 No 2, 1979 pp 82, 85

[Unattributed article; interview with Peter Eisler, chief development
engineer of BHG (Beloiannisz Communications-Engineering Factory) on the
enterprise's 1978 achievements and plans fcr 1979, as published in

ME GAFON ]

[Text] [Question] What were the featured tasks in the field of AR pro-
ducts?

[Answer] Insofar as the GDR market is concerned, a featured task was the
implementation testing of the executive program for the register of the
twin center in Karl-Marx-Stadt; in addition, we also performed work on

the regional centers andonthe twin centers working together in the GDR.
These projects went according to plan; however, the success of our endea-
vors can be determined only after we have handed over the center in Karl-
Marx-Stadt. This is scheduled for this year. This will be when we find out
whether we passed or failed the test.

We can report of major work on the Czech telegraph system. We handed over
two centers, one in Ceske Budejovice and another in Banska Bystrica, this
year. This involved additional major development work, thus completing a
long development project.

In the area of AR development, we found a new trading partner: We established
market connections with Cuba. We developed new circuits in the framework of
our cooperation with Cuba's telegraph system. This project deserves special
mention since the AR development department developed 16 different circuits
within a period of only tires months. With the cooperation of the fittings-
design and the design-planning departments, we completed the manufacturing

12

documentation by the end of the year. In my judgment this was one of our
must sucessful developments last year. Of course, much still remains to
be done before the first centers are actually installed.

[Question] Much has been heard in recent times about container centers.
[Answer] The preparation of this new design was another major activity in

the area of container-type centers. The prototypes of three centers, each
with a different function, were finalized before the end of the year.

[Question] What other developments were worked on?

[Answer] Adaptation of the ARL line concentrator to domestic conditions
has been completed. The first prototype is ready; it was given to the
Hungarian Postal Service for use testing. Among the major developments
associated with the AR products I mention the mass-caller and electronic
evaluator designed for Czech centers, which uses a special control unit.
The equipment has significantly facilitated the cross-callability of the
Czech centers. The fact that we already received an order indicates that
the development was successful. The Czech Postal Service actually ordered
several systems.

Preparation of a network simulator for the centers of various types used
in the GDR is in progress for the last two years. Using microprocessors,
we establish a highly intelligent system, which will help with the trans-
fer of the centers in Karl-Marx-Stadt. This system, with stored program
control, represents the latest state of the art. The project will be
completed in 1979; presently we work intensively on writing the programs
and program insertions.

We have emphasized this development right from the beginning since in this
field we have no tried-and-tested approaches. We do have some difficulties:
we lack certain equipment such as displays and perforated tape readers-
writers. We had to find a way for operating without them. The system will
be tried out this year, when the center in Karl-Marx-Stadt will be finally
checked out and handed over.

Insofar as subcenters are concerned, we had to design two new centers for
all practical purposes: the CA 42 C and CA 102 C types. Since the work has
been started early in the year, and manufacture is already in progress,
this was a development accomplished at extra-high speed.

The universal operating console is completed; it may be used with the
CA 10002, the KA 5001, and the QA 512 subcenters. Development of the RX
small-capacity center familiy proceeds according to plan.

13

We completed the Type KA 5001 large subcenter for the needs of today's
market in addition to the planned activities. For all practical purposes,
this system has an unlimited capacity, and also has a special technical
advantage: It integrates the advantages of main and secondary centers,
and may be used as a so-called centrex center. In network cooperation

it has the characteristics of a main center with very favorable executing
capability. It seems that this system will be the hit of the future since
in addition to the above it can execute all subcenter functions which

are offered in the most up-to-date electronic subcenters available on the
Capitalist market. Development will be completed next year, and we expect
to be able to deliver in 1980 already. Since it is assembled from AR
components, we expect to find a dependable long-time market.The Hungarian
Postal Service has already ordered several thousands of lines. Let me
state one more thing: We work on the prototype, the laboratory models are
completed, and we are ready to start testing. In my judgment this de-
velopment is a key one for the new year.

For a special market order we developed the MFC signal-type selection for
centers of the CA 1002 type. This permits the setting up of a closed-
target network in conjunction with ARM transit centers, using the CA network.

Much work was performed in the area of computer-technology applications.
One such project was the computerized preparation of the external wiring
of the centers; another was the development of a system supporting the
preparation of engineering bids.

[Question] On what developments will you work in 1979?

[Answer] Some of the ongoing projects will be continued during 1979. Among
these is the completion of the center in Karl-Marx-Stadt. This will be one
of the largest telephone installations in the history of BHG.

Among the new development I first mention two: One is the preparation of
the conversion of the Hungarian telephone network to eight digits; the
other is the completion of new types of container center for the Hungarian
Postal Service.

[Question] How much advancement i: taking place in the field of electronic
deve lopment?

[Answer] In electronic developments one of our major guidelines is the in-

plementation of experiences already available with microprocessor applica-
tions. First of all we desire to develop further the network simulator

14

designed for the center in Karl-Marx-Stadt. On this basis we desire to de-
velop an integrated traffic-measuring, traffic-analyzing, and operation-
monitoring system whicn is badl)} needed for the modern maintenance centers
already today and which is demanded by the customers.

Another idea of ours is aimed at eliminating imports. In this field we
attempted to advance by more daring adaptations. What we mean is that we
do not take over drawings in a slavish fashion, but we rework them so that
they conform to our development approaches. This year the first such pro-
ject is the develovoment of modern switching stations, electronic tarif
and timing pulse generating system, and replacement of imported central-
ographs designed for use in conjunction with the APM centers.

We shall continue with the development of new electronic devices. We start
with the preparation of an entire family of boss-secretary devices and the
development of the electronic telephone directory. Insofar as the latter is
concerned, let me say that we have in mind a pocket-calculator sized de-
vice in which the most important telephone nuabers can be programmed in.

As a matter of fact, the second generation will also contain a clock, a
calendar, and perhaps also an electronic calculator capability. We

intend to develop the boss-secretary devices in this direction also.

[Question] May we also expect new developments in the field of design and
construction?

[Answer] We start the development of a new product, namely the relay cap-
able of being mounted on the NYAK card, in 1979. Another plan calls for
the adaptation of a miniorganizer system to domestic conditions. Using
this system, we could reduce the space requirements of our telephone cen-
ters by approximately 25 percent.

[Question] Which way are you moving in the area of research/development?

[Answer] We try to develop further the external wiring; we will also study
the computer-assisted determination of the wiring of relay bands both of
direct and conventional type. We will also study methods for measuring the
service life of telephone-engineering devices, including computer-aided
evaluation.

We will also try the computer-aided preparation of the traffic dimensioning
and optimum layout of AR-type centers. This may be very useful in the long
run since the computer, with the entered data, prepares quickly and accurat-
ely the entire production preparation and the required documentation. Of

15

course, these are complex tasks, which cannot be expected to be completed
within a short period of time. This subject will be worked on for a period
of several years. The above-mentioned traffic measuring and operation-
monitoring system will give us another featured activity: establishment

of the theoretical fundamentals of the systen.

2542
CSO: 5500

16

THE GTT 8000/960 MICROWAVE RADIO RELAY EQUIPMENT

Budapest MUSZAKI KOZLEMENYEK in Hungarian Vol 25 No 2, 1979 pp 61-74

[Article by Dr. Andras Somogyi and Attila Deak, ORION]

[Summary] "The GTT 8000/960 system is a fully solid-state, heterodyne-type
microwave relay system designed for the long-distance transmission of up
to 960 FDM speech channels, or for the transmission of black-and-white or
color television audio and video signals. The system operates in the
7725-8275 Miz and 7900-8400 Miz bands, on the basis of CCIR and CEMA fre-
quency standards. It is a modern radio-relay system, which in Hungary was
used for the first time in the Hungarian sector of the INTERSPUTNIK system.
The equipment may be operated in the 0°-50°C temperature range."

"The networks assembled from the equipment conform to the recommendations

of CCIR and CEMA. The fully solid-state, partially integrated circuitry
permits the establishment of highly reliable and easy-to-maintain connec-
tions. The equipment may be operated with a d.c. supply of -24, -48, or

-60 B directly, or—using a continuous supply source—with an a.c. network."

"Trunk connections may be established with the aid of the channel-reserve

system operating among the medium-frequency points, the remote-control and
remote-monitoring system, and service telephone ~hannels (omnibus and ex-

press). The signals of the auxiliary devices must be transmitted under the
signal band of the multichannel telephone signal. The GIT 8000/960 system

may be adapted to other standard radio-relay systems or multiplex systems

both on the intermediate frecuency and the baseband."

"The radio-frequency and terminal devices were developed at ORION; the
service channel reserve and remote-control systems were developed by the
Research Institute of Telecommunication."

17

"The following basic services may be realized with the aid of the modems,
the terminal devices, and the auxiliary devices:"

"a) Transmission of up to 960 channels of FDM baseband (60 kHz-4287 kiiz)
together with the pilot of the multiplex device over the individual
broadband channels.

b) Transmission of black-and-white or color (SECAM or PAL) television
programs, with a high-quality music channel.

c) Transmission of black-and-white or color (SECAM or PAL) television
programs with four high-quality music channels.

The distribution of the up to eight radio-frequency channels among TV and

TF channels may be made in any desired way with one restriction: Since

the signals of the auxiliary devices are transmitted under the baseband of

the TF channel, we must provide for the transmission of at least one TF

channel (together with the common reserve channel assigned to it).

The GIT 8000/960 system is suitable for the establishment of a trunk

network. It is also suitable for operating as a branch line of other

trunk systems. In this case, connection may be at the intermediate fre-

quency of the baseband, at CCIR-specified levels and impedances. The
devices are designed for indoor installation; thus they may be accommodated
in containers also."

"The following auxiliary services may be realized over the connections:"

"a) Sector telephone (omnibus) channel, which establishes connection between
two baseband stations (modem sector) and all repeater stations between
them.

b) Up to three express (long-distance) channels, which establish connec-
tion among main and terminal stations by means of calling over the
entire length of the microwave chain.

c) Remote control, with the aid of which up to eight stations may be hand-
led (remotely controlled and monitored) from a center at any end of
the microwave chain.

d) Intermediate-frequency channel reserve, which provides pretection from
equipment malfunctioning and fading, and which provides up to two re-
serve channels for six operational radio channels.

e) Baseband reserve, wherein one or two operational modulator(s) or de-
modulator(s) have one reserve each.

Transmission of the auxiliary services (a-d) is under the 960-channel base-

band in the 0.3-54 kHz frequency spectrum. Baseband reserve requires no

return-direction channel; thus, it can be realized in case of simplex TV
transmission also."

18

"System-Engineering Features of the Design"

"A) As a result of the increased transmission capacity (960 channels, com-
pared to 300 channels in the earlier design), the system parameters
had to be increased; specifically, the transmission power for the sys-
tem to 700 mW, the signal-to-noise ratio to 7.0 dB. Accordingly, of
the noise level allowed by CCIR, 3 pW/km, we utilized 1 pW/km for the
incoming-level noise at a fading of S dB.

B) In order to reduce the transmitter-recciver noise (local noise), we
selected the base oscillator frequency of the receiving locale at
approximately 125 Miz, and we installed a noise-cutting invar UHF
filter at approximately S00 Miz.

C) In order to reduce the echo-type reflection noises, we designed the
interfacing of the individual connected devices in such a manner that
the total of the collision dampings became 50-60 dB. By using a novel
antenna type and a circulator with improved parameters, we reduced the
reflections originating on the feedline.

D) In order to reduce the intermodulation noises, we designed novel so-
called resistor-coupled amplifiers. As a result, those transmission
distortions which arose because of the simultaneous presence of the
running-time curvature and conversion were eliminated. It thus became
possible to provide low signal-to-noise ratios over a wide AGC range,
as outlined in Item 1. Reduction of the level of the intermediate-
frequency upper harmonics gave us improved intermodulation noise con-
ditions (especially at the limiter inputs).

E) Changes in temperature significantly affect the transmission character-
istics. As a result of the frequency shift of the microwave filters
tuned for room temperature for amplitude and running time (if the fil-
ters are made of copper or aluminum), the running diagram and the am-
plitude characteristic will tilt. In the case of several stations con-
nected in series, the faults add up quadratically, insofar as the over-
all effect is concerned. For this reason, the system would no longer
conform to the noise provisions of the standards governing multichannel
telephone systems if the transmission line is long and there are a few
degrees C fluctuations (for example at sunrise or sunset). It therefore
became necessary to use invar microwave filters in the three-cavity,
four-cavity, and five-cavity cases.

F) In order to eliminate the systematic noise cumulation with consecutive
sectors, we separated the correctiag system into several parts.

- The -t corrector following the main amplifier is called upon to correct
the major part of the running-time distortion of the repeater station
(transmitter-receiver filter-change filters channel filters for ident-
ical and adjacent channels, intermediate-frequency filters). This is
where the entire carrier-frequency amplitude correction also takes place.

19

- The running-time corrector in the transmitter intermediate-frequency
amplifier primarily corrects the "transmitter-mixer with filters"
unit; however, in some sectors noise compensation can be realized
by joint tuning with the main corrector.

- The active running-time corrector in the intermediate-frequency output
amplifier has as its basic function to jointly correct the moden;
however, in the case of several sectors it may also be used as the
“accumulated running-time corrector."

- The corrector in the intermediate-frequency modulator jointly corrects
the transmitter limiter and the modulator.

G) In order to improve the quality of the TV picture and the auxiliary
audio carriers, we designed highly stable, low-noise circuits.

H) To improve the overall efficiency, we used converters with a switch-
ing frequency of approximately 200 kHz in the MODEM and TV terminal
devices. The modulatable base oscillator supply unit accommodated i»
the SRF frame is similarly constructed. All devices may be operated
from ad.c. voltage of -24 V, -48 V, or -60 V."

"The Frequency Plan"

"The frequency range of the 8 Giz frequency permitted in Hungary for
medium and large number of channels is, according to the first Canadian
amendment of CCIR 386, 7725-8275 MHz. ¢

The following are the main characteristics of the raster:

- Up to 1,800 telephonic information channels, or an equivalent load,
may be transmitted over the individual carrier frequencies.

- The frequency separation among adjacent channels operating for the
same antenna in the same direction is, under identical polarization,
59.3 Miz; under opposite polarization, 29.65 Miz.

- The distance of the center gap is approximately 104 Miz; this vas
chosen since we left a 50 Miz gap for satellite communications.

- There are provisions for the use of a shifted frequency plan."

The functional parts of the system, for which the major engineering data
are presented, are the following:

A) Antenna and feedline system

B) Radio-frequency transmitter-receiver and switching circuit

C) Channel-reserve system

D) Automatic modem frame

E) Television terminal

F) Service multiplex system

G) Remote-control system

H) Express long-distance telephone system.

20

Captions of the illustrations:

Fig. 1 - The frequency plan

Fig. 2..- The block diagram of the SRF-8 frame

Fig. 3 - Tre block diagram of the aodem frame

Fig. 4 - The block diagram of the television terminal

2542
CSO: 5500

21

TUNISIA

PAPER COMMENTS ON PLANNED GENEVA WORLD RADIO CONFERENCE
Tunis TAP in English 1405 GMT 18 Sep 79 LD

["Pool" item; from the press review on the World Administrative Radio
Conference}

[Text] Tunis, 18 Sep (TAP)--Commenting this morning the International
Conference of Radio Directors which will open in Geneva within a few weeks
under the sponsorship of the 1.T.U., LA PRESSE writes notably; “at the
Geneva meeting, the African, Asian and South American developing countries
intend to claim a broader access to the radio frequencies. These frequen-
cies being given for 20 years, the outcomes of these Geneva proceedings will
certainly be essential for the future. The problem lies in the extremely
rapid development of the wireless communication means. The developing
countries needs increase to such a pass that the number of frequencies
devolved to the third world becomes insufficient and handicaps the expansion
of their own means of communication."

"Thus today 10 percent of the countries of the world disposeof 90 percent
of the frequencies and the third world wants to put an end to this western

monopoly. It is a question of justice and balance in the international
relations, concludes the paper.

CcsO: 5500

22

ETHIOPIA

BRIEFS

RADIO TERMINAL--Addis Ababa, 10 Sep--Ethiopia Sunday inaugurated a Japanese-
built ground radio terminal for communications satellites in suburban Addis
Ababa. The yen 1.4 billion terminal, built by Nippon Electric Co and
Mitsubishi Electric Corp. can connect a telephone call from or to Tokyo

within a few minutes through the communications satellite stationed over
the Atlantic Ocean, it was reported. [Text] [Tokyo KYODO in English
0815 GMT 10 Sep 79 OW)
CSO: 5500 END

23

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