17.
18.

20.
21.

22.
23.
24.
25.
26.

27.
28.
29.

Key:
1.
2.
3.
4,
5.

Circuitry dislocation error

Received F sequence for
Received abort sequence

Detected end of range through message receipt DMC transfer
Detected that CPU data transfer was not able to follow data

end of data
during data reception

reception speed from the circuits

When the program performs buffer chain of received data area

Detected FCS check error on message received

When data frame of received data is less than 32 bit
Detected end of range on the transmitted DMC transfer
Detected that CPU data transfer speed was not able to follow the

data transmission speed
When Modem interface CI
When Modem interface DR
When Modem interface CD

the circuits
on
on

to
is
is
or

DR is turned off during communication

Table 3. Command List of C-6140
(ep) (2)@ 4 3) @ 4 oR @
GRE (g) | xonhemsre. (25
meme (9) | 6)
was (10) R7)
rena a0) 8)

RES < ti2)

BIA ERE oe
ake

Bntantei dy y

anid (14)| # (FEM StS. (31):
acazs (15)| Fhe ETS. (32)

ERT? (16)| ER ARBRE TET ETS. (33)

ER77 __ (1.7)| ERURRREL ET 7ETS. (BA)
Bene | RSte (18) BS!#8E REF ze. (35)|
&¢ [R577 (gy RS(HURRETTETS. (36)
(6) [DR¥s47 (20) DRir—s tr ber onE et. 7H
CD42 77 (21) COATT TMM IDABEH 2 7 TE
[rerr (29) WSLOomaa tate. (39)}
Takes (23) HSLComBAeve7 tT. (40)

- Rerrrrarresrs
(7) [897 Coy Wslcomibs tout sevsete |

Type of command
Command
Explanation of command

Message reception related command
Transmission related command

[Key continued on following page]

14

MBENTHSHEF277TSE. (30)

37)
38)



COLOMBIA

BRIEFS

NEWS BAN LIFTED--The Colombian Government today repealed the measures on
radio and television news coverage of illegal stoppages and strikes which
had been adopted early this week. The minister of communications issued
the following circular to that effect: In order to restore normalcy
throughout the national territory and especially in Bogota, the government
suspended the restraints which it became necessary to impose by means of
Decree No. 2066 on radiobroadcasting stations and television channels. The
decree banning reports, declarations, communiques or comments on illegal
walkouts, stoppages or strikes from being carried by those media has been
repealed. [Text] [Bogota Radio Santa Fe in Spanish 2330 GMT 16 Sep 77 PA]

cso: 5500

35



BULGARIA

COMMUNICATION EQUIPMENT PRODUCED AT RUSE DESCRIBED
Sofia OTECHESTVEN FRONT in Bulgarian 2 Sep 77 p 2

[Article by M. Keremidchiev, okrug correspondent: “Producer of [Telephone]
Informants -- Ruse Industrial Communications Enterprise Expands Its Pro-~
duction Activity]

{Translation] At any time of day a person can use the services of an auto—
matic telephone informant which gives information about train and bus traf-
fic and films showing at the movies during the week, tells the exact time
etc. These apparatuses are produced at the Ruse Industrial Communication
Enterprise as part of the enterprise's extensive production program with
nearly 180 product types. Specialists are well acquainted with the match-
ing device for the selection of subscriber's stations in private branch
exchanges, by means of which the durability of telephone equipment is
increased and subscribers themselves are helped to a considerable extent.
Production of the telephone sets that will replace the operators in private
branch exchanges began this year. Such an automatic device is installed
in the enterprise itself, and for easier explanation let me use the tele-
phone of the deputy director for economic matters, with whom I had a chat
the other day. Comrade Dimitur Tsvetkov has extension phone number 230.
However, if a party dialing from the outside prefixes this number with

the code number 452 designated for the plant, he can then talk to him
without the mediation of the plant telephone operator. Considering that
the enterprise already produces automatic devices for other exchanges as
well, we can imagine what effect this has for the country, since we are
not dealing here with just a reduction in the number of items. A similar
effect is also obtained from the dial exchange facilities that they pro-
duce for the remote command of radio centers. Another necessary apparatus
which is improved from year to year. The enterprise makes indispensable
measuring instruments such as an apparatus that automatically checks the
state of trunk lines in dial telephone exchanges, a cable warning device
that monitors the insulation resistance of cable lines, a radio-relay
network troubleshooter etc.

31



TOGO

MODERNIZATION OF TELECOMMUNICATIONS NETWORK DESCRIBED
Lome TOGO-PRESSE in French 20 Aug 77 p 4
[Article by Amoussa Salami]

[Text] Projects contained in the 3d Plan stress the modernization of the
telecommunications network, the renovation of the cable networks and the
adaptation of the equipment to techniques being utilized in telecommunica-
tions with other countries.

At the Commutation Level

Complete automatization and renovation of our present commutation equipment
includes:

--one automatic R-6 central whose capacity was raised from 1,000 lines to
2,000 lines

--two Philips UR-43 central with 2,500 lines

--eight automatic centrals of the Crossbar type the orders for which were
placed with CGCT [2General Telecommunications Company] in 1972 for Aneho,
Tsevie, Kpalime, Atakpame, Sokode, Lama-Kara, Mango and Dapaon and which
are connected to the Lome autocommutator.

The project, from the present until June 1977 [sic], will ensure the com-
plete automatization of the domestic network through the installation of

the new centrals in Kpalime (200 lines), Mango and Dapaon, those of Atakpame,
Sokode and Lama-Kara (200 lines), being operational since 1975.

The project represented an expenditure of 840 million.

In Lome, the project involves expansion and modernization which not only fall
within the general framework of a transformation of our telecommunications
network but also within that of the integration of the telecommunication
links with neighboring countries.

The automatic central in Lome, with the R-6, or Philips, with a 4,500-line
capacity, does not permit satisfaction of the numerous requests for tele-
phones; what is more, its condition and configuration justify the instal-
lation of equipment with greater capacity and reliability.

40



Table 1. System Components of C-6140 High Speed Communication Controller

Fy # (Qe * (3) # ad
7 QAR Ey bP SIEM S20K Ey BEE
C-61404 fi (6) SESE 1 BRE

20K Ey b /H< SBC EES ABK Ey By
(Dy oa eRe Re
FR OD BISAIDMCIDEF + He
5 PMCRe (8) C-6140A, BED afimens

C-6140B | Bad (5 Al &
(4)

C-6146

Key:
1. Model
2. Product name
3. Comments
4. High Speed Communication Controller
5. DMC component for High Speed Communication Controller
6. 2.4 K bit/second <transmission speed < 20 K pit/second high level

procedure single circuit assignment
7. 20 K bit/second <transmission speed <48 K bit/second high level
procedure single circuit assignment
8. DMC attachment channel for transmission--1 unit to be attached to
C-6140A, B
Mm | 2.
NEAC-3200 Blu DMC+— 28 ‘e (10)
en a &
£7 250/30 (3) ‘ ‘
cre Hiatt ee Lo it
‘ * a (11)
wt Rreseen ; z ®
m kh Mating | z
wh Bice an2 |} (gh (9)

Figure 1. Block Diagram of C-6140 High Speed Communication Controller

Key:
1. NEAC-3200, Model 50/30 CPU 10. Modulation-demodulation
2. Reception DMC channel unit [Modem]
3. DMC channel for interrup- 11. Communication line

tion data transfer
4, Transmission DMC channel 1
5. Transmission DMC channel 2
6. Reception controller
7. Interruption controller
8. Transmission controller
9. Line interface



Table 4 represents the outline of message reception related interrupt con-
ditions and software operations.

Table 4. Interruption Conditions and Software Operation

(EFF 8 & (3) 2 = & F
BABDMC Sy 77 EES EN INTL-“LE
BA TTAMET ELS. SE
Bleyier nae 17)
8 @
(4 BERD lca | so7r—se mma. 18)
® fatzeor (9) [Spc 77oFer 19)
, i ar LOTR UAETA Ye BR 7 Ne, 2
a 7 ae | grass eeeRcaneRTs, 0)
coun. | BEHEFCS29—7U-LEAGLFEM Ty
Bae R Ty [aememcets. 21)
#
el.
(5p se | #E0R 22)
n (12)
2B [eters 77 064 B)i77 LOR EHES. 23)
8 & RE (14)| SR7 et eHT 24)
@iprz> 5) (DTEBKAF— FE VREDA LI 7S
(oh& [ciz> (46) ORGERESE SMELL) 25)

Key:

1. Classification

2. Interruption condition

3. Outline of operation

4. Reception related interruption

5. Transmission related interruption

6. Circuitry related interruption

7. F sequence message received

8. Abort sequence message received

9. Message received EOR

10. Access address discontinue

11. Message received overflow

12. Transmission EOR

13, Transmission underflow

14. Circuitry dislocation

15. DR on

16. CI on

17. Request is made to message received removal processing to remove
this frame that has been received on message received DMC buffer
onto message processing buffer.
Data such as effective word designation, FCS error, message re-
ception format error are also notified at the same time.

[Key continued on following page]

18



GUATEMALA

PRESIDENT INAUGURATES NEW RADIO TRANSMITTER
Guatemala City Domestic Service in Spanish 1618 GMT 16 Sep 77 PA

[Speech by Guatemalan President Kjell Eugenio Laugerud Garcia at dedication
ceremony in Guatemala City for new transmitter of Radio Nacional--life]

[Excerpts] The fact that Guatemalans cannot hear Radio Nacional [Guatemala
City Domestic Service] beyond 30 km from the main studio was what prompted
my talk to Radio Nacional director Gen Sergio Lorenzana, with whom I
discussed the possibility of installing the necessary equipment to have
Radio Nacional transmissions heard not just in the interior of the republic,
but beyond our border with our message to the world. This is even more
important now that our country is determined to recover the territory of
Belize through all peaceful means available. However, as I have said before,
although we would like it to be that way, we are not going to hesitate to
take up arms if necessary if Great Britain tries to humiliate the Guatemalan
people. This is one of the reasons why Radio Nacional should be heard in
all the 23 departments, including Belize Department.

Although expenses have been high, I feel it is money well invested. Money
spent for the benefit of the Guatemalan people is money well invested, We
are not installing this equipment which goes on the air today just for the
sake of it. What good is it to have a 100 kw transmitter, such beautiful
and expensive equipment, if the people are going to turn off their radios
or move the dial to another frequency because Radio Nacional programs do
not attract their interest?

If this should be the case, then we have wasted our money. Therefore, I
have told Lorenzana and the technicians from Radio Nacional that programs
should not necessarily be just entertaining, educational, or transmit
patriotic messages to the four corners of the republic, but they must be of
interest to all Guatemalans. This should not be just the most powerful
station in the country, but the one with the largest audience because of

the programs it carries. I am asking Ricardo Arguedas Martinez, communica-
tions and public works minister, to coordinate with the other nine ministries
to form a committee in charge of planning government news of interest to the
people so that they may know what the government is doing.

36



CONTENTS (Continued)

MONGOLIA

Batmonh Receives ITU Secretary General
(MONTSAME, 16 Sep 77). .sccccccccccccccccccccevcocceees

PEOPLE'S REPUBLIC OF CHINA

Lhasa Telegraph Office Improves Service, Develops Skill
(Tibet Regional Service, 18 Sep 77) ..ccccccccccccccees

‘PEOPLE'S DAILY' on Mao's Work in Posts, Telecommunications
(Peking Domestic Service, 14 Sep 77)..scecceccccccceeee

Briefs
Szechwan Commune's Broadcasting

EASTERN EUROPE
BULGARIA

Communication Equipment Produced at Ruse Described
(M. Keremidchiev; OTECHESTVEN FRONT, 2 Sep 77)......66

POLAND
Political Issues Raised by Satellite TV Viewed
(Andrzej Gorbiel; TRYBUNA LUDU, 12 Sep 77).......eee0-
LATIN AMERICA
COLOMBIA
Briefs
News Ban Lifted
GUATEMALA

President Inaugurates New Radio Transmitter
(Guatemala City Domestic Service, 16 Sep 77).........006

SUB-SAHARAN AFRICA
REPUBLIC OF SOUTH AFRICA

Undersea Cable Break Reported
(THE STAR, 14 Sep 77) .cscccccecccecccccccccteserccseces

-b-

Page

25

26

28

30

31

33

35

36

38



"We are determined to display revolutionary enthusiasm plus death-defying
spirit, go all-out for revolution, seize the day and seize the hour and
make big changes. We will strive to realize within the next 3 years the
goal of establishing and all-round adoption of a complete network of large,
closed-circuit carrier-wave cables and microwave communications trunk lines,
and of having automatic telephones, carrier wave circuits, facsimile trans-
mission of telegrams and motorized delivery available in the main for the
more than 2,000 counties and cities throughout the country. We will strive
to achieve electronic, automated and mechanized techniques and equipment

in posts and telecommunications in an all-round way by 1985, and advance
courageously to attain the goal of catching up with and surpassing the
advanced world level before the end of this century."

cso: 5500

29



6. Circuitry related command

7. Interruption related command

8. Commence transmission

9. Stop transmission

10. Suspend transthission

11. Transmission channel change approved
12. Check status of transmission

13. Check transmission channel

14. Commence message reception

15. Stop message reception

16. ER on
17. ER off
18. RS on
19. RS off

20. DR check

21. CD check

22. Permit interruption

23. Interruption reset

24, Interruption check

25. Begin transmission operation

26. Stop transmission and send abort sequence in series
27. Stop transmission and send F series in series

28. Perform automatic switchover of DMC channels for transmission
29. Check whether or not transmission has stopped

30. Check which of the two DMC transmission channels are being used
31. Commence message reception

32. Stop message reception

33. Turn on ER (Peripheral Equipments Ready)

34. Turn off ER (Peripheral Equipments Ready)

35. Turn on RS (Request Transmission Service)

36. Turn off RS (Request Transmission Service)

37. Check the status of DR (Data Set Ready)

38. Check CD (Carrier Detection)

39. Permit H-SLC interruption

40. Reset H-SLC interruption

41. Check whether or not H-SLC is interrupting

4.4 Command

The list of commands for controlling H-SLC's operation, for use on CPU
program, is presented in Table 3.

5, Example of Control. Program

Verification/evaluation experiments of the high level process, hook-up
communication experiments for verifying and evaluating communication inter—
face between DDX-1 data exchange machine--computer peripherals were con-
ducted at NIT's Musashino Telecommunications Research Institute.



5.3 Evaluation of Berformance

Measurement results of the current control program's overhead is shown in
Figure 8. The conditions of measurement was as follows. It was performed
repeatedly using two H-SLC units and circuitry use within the measured
range was 100 percent.

* * *

(2) Ff F F EOR Treat (4)

cy (BM | tte) 24 778

BAMA
OE

abbhe TZ ?

)
AUETER A a —

2hBD. 2
ee OE
\ 4 yt vRBA 77 (9)
: 7r-4® (3)
PR ERORE 7e-2@ (3)
71-2@@' (3)

Figure 7. Conceptual Received Frame Removing Operation

Key:
1. Interruption of received message
2. DMC reception #1 buffer
3. Frame
4. EOR address discontinue
5. DMC reception #2 buffer
6. (message reception in progress)
7. Removal request cue
8. Removal of received frame
9. Buffer for processing message
* Initiate removal request

21



Key:
1. Interruption from H-SLC (detected by monitor)
2. Interrupt control processing
3. Removal requést
4. Removal completed
5. Removal operation of received frames
6. Completion of frame transmission and reception
7. Circuitry open/close completed
8. Circuitry malfunction
9. Frame transmission request
10. Circuitry open/close request
11. High level transfer control program

(1)'s main function is processing of interruption and analysis. (2)'s
chief function is removal/transfer of received frames to message process—
ing buffer.

The program configuration is presented in Figure 5.
5.2 Operation of the Pwogram

(1) Interruption Control Processing
1. Common Processing of Interruption

Control of DMC channel slated for interrupt data transfer and analysis of
transferred interrupt conditions and apportionment of processing tasks
(message reception processing, transmission processing and circuit control
processing) are executed. As far as the DMC channel for interrupt data
transfer is concerned, once end of range (EOR) is detected, subsequent
interrupt data transfer is stopped. Thus buffer for interrupt data trans-
fer is changed prior to DMC detection.

2. Message Reception Processing
Message reception related interruption is performed.

EOR channel for data reception is equipped with two buffers and by alter-—
nately switching from one to another, the frame transferred via circuit

is received. Buffer conversion is made when receiving DMC's interrupt
condition is deleted. During this interval, a request for removal/transfer
of frame received by DMC reception buffer is sent to the message processing
buffer for each F sequence message receipt interruption.

(See (2) Compilation of message received)
Moreover, having been notified of end of removal operation from message

received removal processing, notice of completion of frame reception is
given to the high level transmission control program.

17



PEOPLE'S REPUBLIC OF CHINA

BRIEFS

SZECHWAN COMMUNE'S BROADCASTING--(Kuanyin) Commune in Pengshan County has
vigorously developed wired broadcasting since 1970. Wired broadcasting

now covers all the commune's 13 brigades and 112 production teams, with a
total of 4,390 loudspeakers. Apart from relaying programs of the central
and provincial broadcasting stations three times a day, the commune
amplifier station also puts out its own programs at fixed schedules. Since
the 11th Party Congress, these programs have propagated the spirit of the
congress and its documents. [Chengtu Szechwan Provincial Service in Mandarin
2140 GMT 15 Sep 77 HK]

cso: 5500

30



transfer on a DMC channel (End of Range). In addition to sending data from
CPU, H-SLC's transmission operation can perform continuous transmission of

F sequence and abort sequence by command. In transmitting messages, two

DMC channels may be used and by using the two channels alternately by switch-
ing back and forth, it is possible to effect H-SLC-CPU data transfer effi-
ciency.

4,2 Message Reception

As with transmission, after Modem has become operational, reception begins
with commence message reception command from CPU. From the bit line-up of
received data, H-SLC first of all detects the F sequences and establishes
synchron pattern. Thereafter, while performing the operation described
under Section 3.4-2, data is grouped into 8 bit units and processed follow-
ing the sequence of left half character of one word, then the right half.
Then, following one word unit standard, they are sent through a DMC channel
assigned for message reception onto CPU memory. This operation continues
until the next F sequence is detected. With regard to the 16 bits imme-
diately preceding the said F sequence, that is, with regard to FCS sequence,
CPU is notified only when there is error in computation. The final F se-
quence does sometimes double as the next frame's initial F sequence; thus
the reception operation is again resumed, H-SLC structure is such that
the data transfer area to CPU may be changed at any time by programming.
The message reception buffer chain is extremely flexible. Stop message
receipt command from SPU ends message reception.

(1) teres 28) (@ a ®)
Oh (5) (3) (6)
ms c-6140 Pari Grolo TAL } RS
H-SLC

(5) (5) (6)
| —F Tae beste] Fp — a

FiFe-7v2(8 et)
A
Cr Ca BT 4 RCA ENBE YE)

FO9 BEY EXD

FCS1,FCS2:FCS2—7¥ A(FCS1,2T16E 7 F)

TEERTs WM E(ZRENBEY FY

Figure 3. Data Flow of Receiving and Transmitting

Key: 4, (CPU memory) F: F sequence (8 bit)
2. 16 bit Ay, Agi address field (8 bit each)
3. Transmitted data area Cj, Cg: control field (8 bit each)
4. Received data area Data: 8 bit Xn
5. Data FCS1, FCS2: FCS sequence (FCS1, 2 --
6. To circuit 16 bit)

12



INTER-ASIAN AFFAIRS

KIM IL-SONG RECEIVES PRC TELECOMMUNICATIONS DELEGATION
SK140356Y Pyongyang KCNA in English 0344 GMT 14 Sep 77 SK

[Text] Pyongyang September 14 (KCNA)--The great leader Comrade Kim I1-song
on September 13 received the posts and telecommunications delegation of the
People's Republic of China. Present on the occasion were the members of
the delegation headed by Comrade Chung Fu-hsiang, minister of posts and
telecommunications of the PRC. Personages concerned Kim Yong-chae and Yi
Chong-mok were on hand. Lu Chih-hsien, ambassador extraordinary and pleni-—
potentiary of the PRC to our country, was also present there. The great
leader Comrade Kim Il-song had a talk with the guests in a cordial and
friendly atmosphere.

cso: 5500



The party branch of the Telegraph Section of the Lhasa Municipal Posts and
Telecommunication Bureau is presently leading the broad masses of staff
members and workers in thoroughly studying the spirit of the 11th Party
Congress. In accordance with Chairman Mao's brilliant inscription for
people's postal and telecommunication service, they are determined to work
hard to fulfill the eight fighting tasks of grasping the key link in running
the country well put forward by Chairman Hua.

cso: 5500

27



MALAYSIA

BRIEFS

POLICE-INTERPOL RADIO LINK--The Royal Malaysian Police will soon have radio
communications with the Interpol headquarters and member countries of the
organization, the director of CID [Criminal Investigation Department],

Datuk Abdul Rahman bin Ismail, said. At present Malaysia is one of the few
countries having only Telex links with the Interpol secretariat in Paris.

He said that Telex links were not very smooth and to communicate with
countries with such facilities was difficult. Radio communications would
facilitate further information and action can be taken quickly. [Kuala Lumpur
Domestic Service in English 0000 GMT 11 Sep 77 BK]

cso: 5500

24



INTERNATIONAL

CHI TENG-KUEI MEETS FRG BROADCASTING DELEGATION
0W131314Y Peking NCNA in English 1243 GMT 13 Sep 77 OW

[Text] Peking, September 13, 1977 (HSINHUA)--Vice-Premier Chi Teng-kuei met
with the delegation of the television Zweites Deutsches Fernsehen (ZDF) of
the Federal Republic of:Germany here this afternoon.

Members of the delegation present on the occasion were Jockel Fuchs, chair-
man of the Council of the Television 2 ZDF; Christian Schwarz-Schilling,
representative of the Christian Democratic Union to ZDF; Reinhard Appel,
editor-in-chief of ZDF; and Gerhard Dambmann, ZDF correspondent in Tokyo.

Erwin Wickert, ambassador of Federal Germany to China, was present.

Vice-Premier Chi Teng-kuei had a friendly conversation with the friends
from Federal Germany.

Also present were Li Lien-ching, deputy director of the Central Broadcasting
Administration, and Tai Lin-feng, director of the Peking television station.

cso: 5500



CONTENTS (Continued)
Meteosat to Aid Weather Prediction
(THE STAR, 15 Sep 77) ..cccccccccccncccccencceccecees
TOGO

Modernization of Telecommunications Network Described
(Amoussa Salami; TOGO-PRESSE, 20 Aug 77)...seeeceees

USSR

Telecommunications Satellite 'EKRAN' Launched
(TASS, 21 S€p 77) .ccececcecccccceccrscncccecescecceseeseeees

Page

39

40

43



4.3 Interruption

When conditions enumerated in Table 2 arise and when interruption is per-
mitted by CPU, H-SLC transfers to CPU through DMC channel designated for
interrupt data transfer, an interrupt information which indicates what type
of interruption it is; and thereby accomplishes this operation. Under
interrupt conditions related to message reception indicated in Table 2,
interrupt address (address of received data that was being transferred to
CPU when interrupt condition arose) is sent following the interrupt informa-

tion.

Table 2. Interruption Condition List

reese [Q2) & # 2 m
3 Fo-7 +2216) | 7~7RTOF>—47 7 AtB1S (18)
Spleen te a7 To eae RME = 7 y eRe (19)
Baar kt Te HB MCRETIY RATES
a CPULaI—F
Bhat e89 ~
29) eisinee atest
Ed
se aGAQ)| 7° 724 8R FH FRU Tee 7 Te
TIATED 79
Avetinonrs (22:
Fest= 7 ASL) giinrcsts 7723-4 (23)

24)

RT? 77 °E14)]
[cles (15)| 2%
DRT» (16) #82242 97.2 DR A

EMORMI 2 972 —RCDE
oe
=~ (17) pctzeconea

RM 2 97 2-ACI HED RE ORE NY

7)

Key:
1. Type of interruption
2. Cause of detection
3. Message reception related
4, Transmission related
5. Circuitry related
6. F sequence receipt
7. Abort sequence receipt
8. Message receipt end of range
9. Message receipt overflow
10. Access address cut-off
11. FCS check error
12. Message reception format error
13. Transmission end of range
14, Transmission underflow
15. CI on
16. DRon

[Key continued on following page]
13



INTERNAT LONAL

BRIEFS

INTERSPUTNIK SATELLITE AGREEMENT--Moscow, 16 Sep TASS--An agreement between
the Soviet Government and the international organization "Intersputnik" was
signed here. It is established by the agreement that the organization's
directorate will work in Moscow. The agreement also envisages creating
the most favourable conditions for the activity of the organization in

the USSR. "Intersputnik" was formed in November 1971, by nine socialist
countries: Bulgaria, Hungary, the GDR, Cuba, Mongolia, Poland, Romania,
the USSR and Czechoslovakia. The organization's purpose is designing,
creation, maintenance and development of the international communications
systems with the use of sputniks and complexes on the ground. The system
must meet the needs of the member-countries in channels for colour and
black-and-white television and telephone-telegraphcommunications. [Text]
[Moscow TASS in English 1029 GMI 16 Sep 77 LD]

cso: 5500



18. This frame is disregarded.

19. Message reception DMC buffer is changed.

20. Request is made to message received removal procéssing to remove
up to this address and put it on the message processing buffer.

21. Compulsorily treat it as FCS error frame and regard it in the
same light as receiving F sequence.

22. If there is a frame waiting to be transmitted, then switch-over
the frame that is currently being transmitted when it is finished,
and control it so as to enable transmission of the next frame.

23. Retransmit this frame.

24. Close circuit.

25. No operation (There is no function in the interface with DT48KA
data set which will generate this condition.)

Transmission related interruption is processed and transmission request
from high level transmission control program is accepted.

Transmission control is applied so that data that has been requested for
transmission is sent out onto the circuit as one frame. DMC buffer for
transmission uses the request source's message processing buffer which
houses the transmitted data.

By using the message transmission DMC attached channel, request for trans-
mission of continuous data may be accepted and after transmission EOR in-
terruption of the preceding frame, automatic switchover to transmission of
next frame with insertion of F sequence can be controlled.

By these means, it is possible to transfer data efficiently by effective
use of circuits.

4, Line Command Operation
After receiving circuit open/close request from the high level transmis-
sion control program, connect/disconnect control between it and the data

set (DT48KA data set) is effected via "control" of control lines.

Table 4 outlines circuitry relation interruptions and processing. Figure 6
represents circuitry open/close processing sequence.

19



JPRS 69885
29 September 1977

TRANSLATIONS ON TELECOMMUNICATIONS POLICY,
RESEARCH AND DEVELOPMENT

: : No. 15

i
EE 20000324 174

NATIONAL TECHNICAL Reproduced From
INFORMATION SERVICE Best Available COPY

U.S. DEPARTMENT OF COMMERCE
SPRINGFIELD, VA. 22161


The cost of the project, financed by BNP [National Bank of Paris] purchase
credits, is approximately 2.4 billion (including equipment and buildings);
and its placement in service is scheduled for April 1978; test reception is
set for November 1977.

Other related projects can be associated with this action to renovate the
telecommunications network to permit us to be masters of our communications
with the outer world. These include:

--The international transit center will be completed at the beginning of
1979; the financing of this project is being studied at the present time
by the Accord Council of the Ministry of Cooperation on the basis of data
supplied by SOFRECOM [?French Telecommunications Research and Development
Company];

--The acquisition of diverse telecommunications and telephone materials
and equipment;

--The modernization of the Lome BCTR [expansion unknown] whose implementation
should be rethought within the overall context of the exploitation by the
earth station of our long distance telephone and telex communications with
the outside world.

8143
cso: 5500

42



JAPAN

HIGH SPEED SINGLE LINE CONTROLLER DESCRIBED
Tokyo NIPPON DENKI GIHO in Japanese No 116, May 76 pp 90-95

[Article: "The High Speed Single Line Controller (H-SLC) for Computer-
Computer Communications", by Kazuyoshi Morino, Nippon Denshin Denwa Kosha
[Nippon Telephone and Telegraph Corporation, abbreviated NIT], Data Communi-
cations Research Division, Yokosuka Telecommunications Research Institute,
Line Controller Research Laboratory; Hiroshi Miharu, Computer Technology
Headquarters, Methods Technology Division; Keitaro Sano and Hakobu Miyahara,
Peripherals Headquarters, First Technical Division; Hidemi An NIT Systems
Headquarters, First Systems Division; Shigeo Igai, NIT Systems Headquarters,
Second Systems Division]

[Text] Summary

This paper describes the High Speed Single Line Controller (H-SLC) that
supports high level data link control procedures, which has recently at-
tracted special interest for application of computer to computer communica—
tions with high speed data transmission line.

1. Foreword

For several years, accompanying the expansion of the size of data communi-
cation systems and their area of application, there has been a rapid in-
crease in the demand for high speed data transmission between and among
computers. Not only the use of specialized circuits, but also the mate-
rialization of high speed data transmission via a data exchange network
is now under consideration.

Traditionally, the study of this field revolved mainly around the basic
mode, data line control procedures. For computer to computer data trans-
mission, a newer data link control procedure that is superior to this
basié mode procedure in performance, reliability and symbolic logic selec-
tion became necessary; and standardization of a high level data link



INDONESIA

BRIEFS

SOUTH SULAWESI TRANSMITTER--Ujungpadang, Sep 8--South Sulawesi Governor
Achmad Lamo has said that with the completion of a 100-kilowatt Radio
Republik Indonesia [RRI] Ujungpadang transmitter, people in South Sulawesi
will be assured of a better broadcast reception than in the past. The
governor said this following an inspection of the new transmitter at
(Pontosuri) in Gowa district. He said the new RRI Ujungpadang transmitter
is capable of overpowering foreign station broadcasts which were formerly
very clearly heard in the South Sulawesi capital. [Text] [Jakarta Domestic
Service in Indonesian 1500 GMT 8 Sep 77 BK]

TELEVISION RECEPTION IN ACEH--Most parts of Aceh Province will be able to
tune on Jakarta television programs as of May 1978, but in view of geo-
graphical conditions, west and south Aceh districts will be able to do so
only by the end of 1978 when the special relay station is completed. The
Bangaaceh television relay station has been operating from this month using
Channel 3. [Jakarta Domestic Service in Indonesian 1200 GMT 17 Sep 77 BK]

cso: 5500



REPUBLIC OF SOUTH AFRICA

UNDERSEA CABLE BREAK REPORTED
Johannesburg THE STAR in English 14 Sep 77 p 9

[Text]

cso: 5500

Own Correspondent

CAPE TOWN — The
undersea ‘telecommunica-
tion cable that linked

South Africa with the rest
of the world has broken
about 12 miles
from Melkbosstrand.

But there was no delay
“in overseas telecommunica-
tions traffic today, the
Postmaster General said in
Pretoria. All international
links were restored ‘this
_morning by standby satel-
lite circuits.
' The owners of the 5800
nautical mile cable, which
starts at Melkbosstrand and
links up with the rest of
the international telecom-
munication network at
sPisbon, . sai the cable

38

broke shortly after 10,"
ovclock last night.

The Cape-based main-
tenance vessel Cable Re-
storer sailed this morning
to repair the break. but it
is not yet known how long
work will take. ;

A spokesman for the !
South Atlantic Cable Com-
pany said it was almost
certain that the cable was
not broken by a fishing ves-
sel. as had been the case
several times in the past.

He said the seabed .
where the break occurred {
was known to be excep-
tionally rocky and had
resulted in a break in
1968.--

The cable, which allows ;
360 simultaneous two-way -
conversations to take~}
place, has been broken
eight times in the past

nine years. .



PEOPLE'S REPUBLIC OF CHINA

LHASA TELEGRAPH OFFICE IMPROVES SERVICE, DEVELOPS SKILLS
Lhasa Tibet Regional Service in Mandarin 1100 GMT 18 Sep 77 OW

[Text] Since the smashing of the Gang of Four, the party branch of the
Telegraph Section of the Lhasa Municipal Posts and Telecommunication Bureau
has actively led staff members and workers in improving professional
competence and developing professional skills thus effectively insuring
the successful accomplishment of the region's telecommunication work.

The Telegraph Section of the Lhasa Municipal Posts and Telecommunication
Bureau renders various kinds of telecommunication service for party and
military organizations and the people of our region. High professional
competence is required. However, when the Gang of Four ran amuck, the
section's leadership did not dare to pay attention to professionalism and
staff members and workers did not dare to develop professional skills.

As a result, mistakes were often made, thereby damaging the work of the
party.

Acting on Chairman Mao's behests, the party Central Committee headed by
wise Chairman Hua smashed the heinous Gang of Four with one stroke. The
section's party branch has since discovered the cause for past mishaps and
has led all staff members and workers in thoroughly exposing and scathingly
criticizing the Gang of Four and in starting a high tide for improving
professional competence and developing professional skills.

The Telegraph Division fighting on the forefront has introduced on-the-
spot training which will generally improve professional competence. Since
the beginning of this year, many comrades have expeditiously and accurately
transmitted and received many messages with not one mistake in 10,000 tele-
grams. To insure early modernization of postal and telecommunication
service, the Transmitter and Receiver Repair Division has carried out
technical innovations. Modifications have been made to the signal line,
the exchange socket and [words indistinct], thus improving efficiency and
insuring quality service.

26



USSR

TELECOMMUNICATIONS SATELLITE 'EKRAN' LAUNCHED
Moscow TASS in English 1154 GMT 21 Sep 77 LD

[Text] A telecasting satellite, the "Ekran" (screen), was launched in the
USSR on Tuesday in accordance with the program of further development of
telecasting systems with the utilization of artificial satellites of the
earth. The onboard apparatus ensures the transmission of color and black-
and-white programs of the central television in the decimeter waveband to
the receiver network in Siberia and in the extreme north.

The satellite was put into a circular orbit which is close to a stationary
one with the following initial parameters: The distance from the earth's
surface--35,560 kilometers, the period of revolution around the earth--23
hours 45 minutes, orbital inclination--0.4 degree.

The apparatus is functioning normally.

The Ekran satellite has an international registration index, Stationar-t.

cso: 5500 END

43



MONGOLIA

BATMONH RECEIVES ITU SECRETARY GENERAL
Ulaanbaatar MONTSAME in Russian 1825 GMT 16 Sep 77 OW

[Text] Ulaanbaatar, 16 Sep (MONTSAME)--J. Batmonh, member of the MPRP
Central Committee Politburo and chairman of the MPR Council of Ministers,
today received M. Mili, secretary general of the International Telecommuni-
cations Union, who is visiting here at the invitation of the MPR Govern-
ment. The meeting, which passed in a warm and cordial atmosphere, was
attended by D. Gotob, MPR minister of communications; D. Saldan, chairman
of the State Committee for Foreign Economic Relations and minister of the
MPR; and other officials, as well as I. S. Bukhtoyarov, permanent repre-
sentative of the UN Development Program in the MPR.

cso: 5500

25



INTERNATIONAL

VNA DELEGATION ATTENDS INFORMATION CONFERENCE IN SOFIA
Hanoi VNA in English 1515 GMT 17 Sep 77 OW

[Text] Hanoi VNA Sep 17--A delegation of VIETNAM NEWS AGENCY led by its
director General Dao Tung attended the conference of directors-general of
news and photo agencies and press organs of socialist countries held in
Sofia from September 13 to 16.

The conference discussed and exchanged experience in: news and photo in-
formation work, improvement of the material and technical bases of radio
transmission and reception in keeping with the progress of modern science
and techniques, and strengthening of cooperation among news agencies to
counter the fallacious propaganda of imperialism.

Other participants in the conference included the delegations of Bulgaria,
Cuba, Czechoslovakia, the German Democratic Republic, Hungary, Mongolia,
Poland, Romania and the Soviet Union.

Following the conference, Onyan Zoinov [name as received] and D. Stanichev,
secretaries of the central committee of the Bulgarian Communist Party, and
Stoyan Mikhailov, chairman of the Propaganda and Mobilization Board of the
BCP's Central Committee, received and had a cordial talk with the delega-
tions.

cso: 5500



We would like to outline the configuration and operation of H-SLC control
program used in these experiments and evaluate its effectiveness.

The configuration of the experimental system is presented in Figure 4.

civre |
(em) a save Hos},

.: 48KBPS
(1) xm7-9) arcrtis
C6140B
LP H-SLC

(iets Row) (2)

Ds--DTseka7—7 44+ (3)

Figure 4. Experimental System Configuration

Key:
1. (Experimental data)

2. (Experimental result's output)
3, DS...DI48KA data set

5.1 Program Configuration

This program consists of following two proadly delineated parts.

(1) Interruption control processing
(2) Removal processing of received frames

H-SLCOD 5 OMA
i (ence) (1)

PARES
(2)
(3) wReR,  feRRT (4)
7 Eemk
(6) | L star (9)
REBT nar:
- —Te
-ERt-77 Ba7y—2 go xe (10)
(7) 25-287) Sele)
(8) Baas
r i
od Leese
172774 (11y
t--------= 4
Figure 5. Configuration of H-SLC Control Program

[Key on following page]

16



POLAND

POLITICAL ISSUES RAISED BY SATELLITE TV VIEWED
Warsaw TRYBUNA LUDU in Polish 12 Sep 77 p 7
[Article by Dr Andrzej Gorbiel]

[Text] Satellite telecommunications, or the utilization of artificial
earth satellites for communications purposes, is undoubtedly the area of
the achievements of astronautics which is currently distinguished on a
global scale by the widest dissemination. Its various practical benefits
are already today shared by a significant number of countries. It is
characterized by a utility which is directly felt by millions of
inhabitants of the entire globe.

The manifold detailed legal problems associated with this have become the
subject of many international agreements. A large role in resolving them is
being played by international technical organizations, such as the UN
International Telecommunications Union "Intelsat," which includes over 80
capitalist and developing countries, and "Intersputnik," which was established
by nine socialist countries.

Continual improvements and further spread and intensification of technical
means of satellite telecommunication, create also an urgent need for
resolving on an international plane the more general questions of a political
and legal nature. These are linked primarily with the dynamic development
of the technology of transmitting television programs.

Space craft placed in orbit around the earth are used on a wide scale to
emit programs which are received through the medium of ground relay stations.
The near future is to bring the dissemination of a subsequent achievement

of space technology: transmitter devices which will make possible the
direct reception of programs from satellites, first with the help of
specially adapted television receivers and, in the next stage of technical
development, with the help of mass produced standard television receivers.

And it is precisely the application of the newest method of direct television
transmission which requries particularly painstaking regulation on account
of its implications of a political nature. Awareness of their gravity
inclined the UN General Assembly to enact in 1972 a resolution stating that

33



"it is a matter of necessity to work out principles defining the ex-
ploitation by countries of artificial satellites for the purposes of direct
relevision in order to negotiate one or several agreements of an international
character,"

In 1974, the Legal Space Subcommittee of the UN started to draft, on the
basis of submitted proposals, the single text of principles which was en-
visioned by the resolution of the General Assembly. The following years
brought about the formulation of nine detailed drafts of this kind for the
future international convention. At the top place was the scheme postulated
by the Soviet Union, which stated that "the activity in the area of inter-
national direct satellite television should be carried out in a manner
conforming to the development of mutual understanding and to the streng-
thening of friendly relations and cooperation among all countries and all
nations in the interest of maintaining international peace and security."

The most lively discussion was evoked by the matter--undoubtedly the most
important--of what answer to give to the question whether the transmigsion
of programs onto the territory of another country requires its prior consent.

The countries of the socialist community consistently represent the view-
point that use of satellite technology for direct television emissions without
consent is impermissible, since it would constitute an obvious violation of
the sovereignty of the country for whose territory such emissions were
intended. This is because there is a serious danger of misuse of modern
technology for the furtherance of activities in conflict with the national
interests of countries which are protected by the law of nations, for
impermissible interference in their internal affairs, for carrying out
ideological subversion, for propagandizing the slogans of militarism and
the ideas of racial or national hatred or discrimination, or finally for
the dissemination of material offensive to moral or customary standards
adopted by a country. Indeed, we already have to deal with such attempts,
organized in an obvious manner, on the radio waves--let us recollect

Radio Free Europe or other anti-Communist broadcasting stations.

The position of the socialist community met with wide support on the

part of the Third World countries and several Western countries (e.g.,
France). Nevertheless, the United States and several other capitalist
countries (including Great Britain, the FRG, and Belgium), bandying around
the legally completely meaningless slogan of assuring full freedom for
the exchange of ideas and information, oppose any limits on the permis-
sibility of emissions directed beyond their borders.

And this obstructive stance of a handful of Western countries has already
for a lengthy period of time rendered impossible an agreement upon a final
text of a convention settlement of the matter under discussion: The issue,
however, becomes ever more urgent, and it should be resolved in accordance
with the interests of peaceful international cooperation.

cso: 2600

34



Reproduced from

best available cop:

zn—77+ (2)

3000

tert) (4)

Figure 8. Performance Measurement

Key:

1. CPU use rate

2. Throughput

3. Length of frame

4. (bit)
_ transferred information volume (bit)
5. CPU use rate = frame transfer time-CPU idle time
frame transmission time-CPU idle time

frame transmission time

Throughput =
* . monitor overhead
CONCLUSION

The preceding sections described the configuration, operation and an exam-
ple of control of the High Speed Line Controller which supports the high
level data link control process. Along with the increase in the data
volume handled by the on-line systems recently, there is an increased de-
mand for high speed communication lines.

The high level data link control process not only raises transmission
efficiency by means of continuous data transmission, unaffected by trans-
mission delays, but makes transmission via any agreed upon symbolic format
possible. We believe that along with increased demand for faster circuitry
speed, its application level will increase significantly.

Since the recent development of Model 70 as the machine to follow mini-
computer NEAC 3200 Models 30 and 50, the price of high speed communication

22



JPRS 69885

29 September 1977

TRANSLATIONS ON. TELECOMMUNICATIONS POLICY,

. RESEARCH AND DEVELOPMENT
No. 15
ConTENTS PAGE
INTERNATIONAL
Chi Teng-kuei Meets FRG Broadcasting Delegation
(NCNA, 13 Sep 77). .cccccccecccscvccecccvcesecvacecscecece 1
VNA Delegation Attends Information Conference in Sofia
(VNA, 17 SCP 77) .cceccccccccecccccrccccncetccecssetnecessseees 2
Briefs
Intersputnik Satellite Agreement 3

ASIA
INTER-ASIAN AFFAIRS

Kim Il-song Receives PRC Telecommunications Delegation
(KCNA, 14 Sep 77). .cccccccecncccccncccercccncecsccescees 4

INDONESIA
Briefs
South Sulawesi Transmitter 5
Television Reception in Aceh 5

JAPAN

High Speed Single Line Controller Described
(Kazuyoshi Morino; NIPPON DENKI GIHO, May 76)........006 6

MALAYSIA

Briefs
Police-Interpol Radio Link 24

-a- {III - INT - 140]



The cost of all this equipment totals 2.1 billion francs and the assignment
of credits for the following operations:

--the installation of the 700-line telephone central, expandable to 10,000
lines, with a national transit center to assure automatic interurban trans-
missions;

--the installation of two small-capacity centers, 2,000 lines and 1,000
lines, connected with the principal central to service the port area and
the northern sector of the capital;

--the construction of three buildings for the three centrals (200 million
frances);

--the modernization and expansion of the telephone network (700 million
francs).

The expansion of the telephone network during the 3d Plan should reach most
of our urban centers but also the rural areas where we could install a pri-
mary infrastructure such as telephone booths.

Project for Communication by Hertzian Wave Clusters

Modernization also involves the telephone links. Since the end of June 1977,
Togo has assured the routing of all communications between the large urban
centers, thanks to its network of Hertzian wave clusters. This program falls
within the framework of the entire PANAFTEL [?Pan-African Telecommunications
Network] and includes three projects now being implemented:

--links by Hertzian wave clusters with Benin. The optical line-of-sight
cluster between Lome and Cotonou passes through the corresponding Aneho
station and that of Ouidah in the Benin network. This wave cluster was
financed by FAC |Aid and Cooperation Fund] in the amount of 180 million CFA
[African Financial Community] francs.

--Lome-Upper Volta link. This link is the extention of the present Lome-
Lama-Kara link; six stations are needed to provide line-of-sight linkage
with Upper Volta. The cost of the project to Togo is 565 million.

~-Line-of-sight Hertzian wave cluster between Lome and Ghana. Talks are now
in progress to convince Ghana to have a line-of-sight link with our Agou
station, with its wave cluster passing through Ho on a 12-channel circuit.

The Lome-Ghana project for a large, 120-line coastal bank, expandable to
600 lines, falls within the PANAFTEL network. At the PANAFTEL meeting in
Lome on 22 March 1977, ADB [African Development Bank] gave its approval to
the dispatch of an evaluation mission to Ghana to conclude a loan agreement.

Satellite Communication Project
The Togo government, desirous of making reliable and good quality long dis-

tance communications available to the public, has decided to obtain a tele-
communications earth satellite (TELSPACE).

41



METEOSAT TO AID WEATHER PREDICTION

Johannesburg THE STAR in English 15 Sep 77 p 5

[Text] .

cso:

Pretoria Bureatt
All systems are “go” for
South Africa to start re-
ceiving photographs of its
weather systems taken
from an altitude of 36 000
‘km.

Meteosat, the first
meteorological satellite to
be put into space by the
European Space Agency,
is to transmit images of
the earth’s weather pat-
terns at the rate of one
every 30° minutes from
December.

The spacecraft to be
launched from Cape
Canaveral on November 3
will be “parked” over the
point where the Green-
. Wich Meridian intersects
the Equator. It will then

, be in a position to scan

5500

the earth trom pole-to-pote

and 70 degrees to both
‘sides of the meridian.

Hartebeeshoek tracking
station near Pretoria will
receive coded signals from
the satellite every half
hour which will then in
turn be transmitted to the
Weather Bureau by nor-
mal post office lines.

“The new system will
enable us to improve the
accuracy of weather fore-
casting ‘and this in turn
will be of benefit to many
sectors in South Africa,”
says Mr I Lloyd, Deputy
Director of the Weather
Bureau. .

“We will, be able to
provide aircraft and ship-
ping with more detailed

reports on weather sys-;

39

ideal,” says Mr_,_Lioyd.

REPUBLIC OF SOUTH

tems. Farmers and the
fishing industry will also
benefit,” he said.

Images can be enlarged

80 that. the paths of cold

or warm currents can be
seen.

Piankton tends.to accu-
mulate where cold water
mixes with warm and this
is where fish will be found.
Fishermen can therefore~
be tipped off as to the pre-
cise location of such areas.

“We are still a long way
from being able to forecast
the weather perfectly but
the new satellite will take
us a little closer to the

AFRICA

ai



3.2

Standards

H-SLC's standards are as follows:

3.3
(>)
(2)

(3)

(4)
(5)

(6)
7)

(8)

Temperature: 0-40 degrees Centigrade
Humidity: 30-85 percent

Other: It is incorporated within NEAC-3200 drawer and power is sup-
plied by NEAC 3200

Functional specifications
Number of assigned circuits: one full duplex line

Kind of circuit: Specific communication lines and public communica—
tion lines

Communication speed: C-6140A is more than 2.4 kilobit per second,
less than 20 kilobit per second. C-6140B is more than 20 kilobit per
second and less than 48 kilobit per second.

Communication format: full duplex or semi-duplex

Synchronous format: synchronous (synchronous bit is executed using
Modem's transmission timing signal ST2 and synchronous frame is made
possible through F sequence.)

Symbolic unit used: 8 units
Error detection:

1. Received message F6S check error: FCS check of data received.
(See Section 3.4)

2. Received message format error: Format of received data is in-
spected and when the receiving bit of data frame surrounded by
F sequence is less than 32 bit, format error is declared.

3. Received message over-run error: Error is detected when data
transmission between H-SLC and CPU fails to comply with data
reception circuit speed.

4, Transmission under-run error: Detection when data transmission
between H-SLC and CPU fails to follow the speed of data trans—
mission to circuits.

Connection with CPU: One NEAC-3200 DMC (Data Multiplex Channel) chan-
nel is used for received data transfer, transmitted data transfer,



expression Oy ad, In case of data transmission, FCS is automati-

cally appended via H-SLC. In the case of data reception, detection is
automatically performed within H-SLC and when error is detected as a re-
sult, it is regarded as a FCS check error and CPU is notified.

Moreover with respect to transmission and reception of a frame, the follow-
ing operations are performed within H-SLC.

1. A, C (Data Field) are sent out at low level bit and FCS is sent
out from a higher bit.

2. Bit operation within A, C (Data Field) and FCS.....With respect
to data transmission, after sending out five consecutive "1", "oO"
is always inserted. However, this operation is deleted for F
sequence and abort sequence. In message reception, when five con-
secutive "1" is received and immediately thereafter, "0" is re-
ceived, that "0" is deleted and the result thereof is the received
data. In these operations, there is no recurrence of F sequence
nor appearance of a pattern identical with an abort sequence (to
be discussed below) in the A-FCS of the frame surrounded by F
sequence. Therefore CPU may send out data of whatever pattern
and it can accurately be reconstructed on the receiving end.

3. As a pattern for aborting the data in transmission, there is the
abort sequence. The bit pattern is 01111111 and it is sent out
on a circuit from "0" bit. In the case of message reception,
when more than seven consecutive "1" are received, it indicates
the receipt of abort sequence. The in-transmission abort is used
to effect extraordinary termination of transmission block during
transmission so that the receiving end would abort the block that
it is receiving.

4, Operational Outline

H-SLC's operation may broadly be classified into transmission, reception
and interruption.

4,1 Transmission

Transmission begins with CPU's commence transmission command after Modem
becomes operational. The transmitted data passes from CPU's memory at

the rate of one word 16 bit via DMG channel appropriated for transmission
and is sent to H-SLC. One word data that has been sent to H-SLC is sent
out onto the circuit via Modem unit's transmission timing (ST2 signal)--
first left half character then right half character; within half character,
from lower level bit--while performing the operation described under 3.4-2.
In this instance, the transmitted data's initial and final F sequences

and the 16 bit FCS sequence are automatically added on within H-SLC.
Figure 3 is a flow chart of this operation. End of transmission is indi-
cated by stop transmission message from CPU or detection of end of data

il



BIBLIOGRAPHIC DATA 1. Report No. gprs 69885 2. 3. Recipient's Accession No.
fa. Title and Subtle 3. Report Date
TRANSLATIONS ON TELECOMMUNICATIONS POLICY, RESEARCH 9 September 1977
AND DEVELOPMENT, No. 15 .
7. Author(s) 8. Performing Organization Rept.
‘ jo.
9. Performing Organization Name and Address 10. Project/Task/Work Unit No.
Joint Publications Research Service
1000 North Glebe Road 11. Contract/Grant No.
Arlington, Virginia 22201
12. Sponsoring Organization Name and Address 13. Type of Report & Period
Covered
As above
14.

15. Supplementary Notes

16, Abstracts

This serial report contains translations 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. Key Words and Document Analysis. 17a. Descriptors

Worldwide

Computers

Satellite Communications

Electronics and Electrical Engineering
Telecommunications

Telemetry

17b. Identifiers /Open-Ended Terms

Ie. COSATI Field/Group, Q9B, C, F, 17B, 22B

18. Availability Statement 19. Security Class (This Zi. No. of Pages
Unlimited Availability Report) D IO
Sold by NTIS ° [0 Sec LASSIFIED — 22. Price
Springfield, Virginia 22151 / Pac CLASSIFIED x

FORM NTIS-35 (REV. 3-72)

THIS FORM MAY BE REPRODUCED UscoMMDE 14982-F72



Something new for the enterprise are automatic devices to perform postal
services. A card-vending machine has a simplified principle and a long
service life. Automatic newspaper and magazine-vending machines are be-
ing put into production. The machine is included in the CEMA program and
regular production of it will start at the beginning of next year. The
retransmitters that they produce are highly rated.

The results of half-year performance are very good. The production program
is 106.83 [percent] accomplished, per-capita labor productivity reached
107.97, while social productivity rose to 113.76. Inputs per 100 leva of
output were cut to 66.81 leva as against the targeted 71.15. The report
period showed again 124.69 percent fulfillment of the profit plan.

Attention is now turned towards constant improvement of technology. A
survey made in order to raise the social productivity of labor has resulted
in the introduction of additional mechanical equipment in the workshops.
Individual components are designed, and with the narrower specialization
that has been introduced, every worker stays at the place where he is most
useful.

None of the people I talked to failed to mention the measures that are be-
ing taken to prepare for the next production year 1978. The production
program is fully spelled out and tailored to uniform apportionment of

the plan over the five-year period year by year, month by month, and day
by day. The workshops are providing matrices, billets for bending,
templates for cutting, and other additional equipment to lighten human
labor. Conditions are being made ready to introduce the mechanized cleaning
and tinplating of elements. New process lines will be started up that will
result in a further increase in labor productivity. The plant's compre-
hensive measures include the new organization of payment as well as a
social survey of labor that will lead to the discovery of new opportunities
for improving the organization of production and manufacturing method.

6474
cso: 5500

32



rasxa (18)

(1) w-seav H-SLC Ean
ene SP
| prey (5)}-——}------ ors {1/1) ;
; cain a ee rstXll2) S-LINE

L RStrte SOD
(ayy ® (6) ese 413) feet (as)

| QP nanaie
¥-7€4(22)
neo sy [sume
Ciel en ed er ae
t 1E) (10) cor7 7)__ LRcLINE

ese) (21)

Figure 6. Control Operation for Data Set Interface

Key:
1. H-SLC control 13. C8 on
2. Open 14. CD on
3. Close 15. RS off
4. ER on command 16. CS off
5. DR on check command 17. CD off
6. RS on command 18. DT48KA data set
7. CD on check command 19. $-line (base band signal sent)
8. ER off command 20. R-line (base band signal received)
9. RS off command 21. S-line (base band signal termi-
10. (Stop transmission/ nated) .
reception)
11. DRon
12. RS on

(2) Removal of Received Frame

Following frame removal request from reception interrupt processing, the
frame received on DMC reception buffer is removed and transferred to
message processing buffer. Because multiple frames are received succes—
sively on DMC reception buffer, this operation consists of (1) transfer
of one frame onto one buffer for message processing and (2) "setting" the
status onto buffer's prefix in order to notify the condition of the re-
ceived frame to the high level transmission control program.

This operation is carried out with a task level mode which permits inter-
ruption.

Figure 7 describes the concept of removal processing.

20



NOTE

JPRS publications contain information primarily from foreign
newspapers, periodicals and books, but also from news agency
transmissions and broadcasts. Materials from foreign-language
sources are translated; those from English-language sources
are transcribed or reprinted, with the original phrasing and
other characteristics retained.

Headlines, editorial reports, and material enclosed in brackets
{} are supplied by JPRS. Processing indicators such as [Text]
or [Excerpt] in the first line of each item, or following the
last line of a brief, indicate how the original information was
processed. Where no processing indicator is given, the infor-~
mation was summarized or extracted.

Unfamiliar names rendered phonetically or transliterated are
enclosed in parentheses. Words or names preceded by a ques-
tion mark and enclosed in parentheses were not clear in the
original but have been supplied as appropriate in context.
Other unattributed parenthetical notes within the body of an
item originate with the source. Times within items are as
given by source.

The contents of this publication in no way represent the poli-
cies, views or attitudes of the U.S. Government.

PROCUREMENT OF PUBLICATIONS

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ing, it is recommended that the JPRS number, title, date and
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Indexes to this report (by keyword, author, personal names,
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Correspondence pertaining to matters other than procurement
may be addressed to Joint Publications Research Service,
1000 North Glebe Road, Ari ia 22201.



PEOPLE'S REPUBLIC OF CHINA

"PEOPLE'S DAILY' ON MAO'S WORK IN POSTS, TELECOMMUNICATIONS
Peking Domestic Service in Mandarin 2230 GMT 14 Sep 77 OW

[Excerpts of PEOPLE'S DAILY 15 September article by Ministry of Posts and
Telecommunications Theoretical Group entitled: "Triumphantly Advance

Along the Orientation for People's Postal-Telecommunications Work as Pointed
Qut by Chairman Mao"]

[Excerpts] "The Posts and Telecommunications Departments are the nerve system
of the party and state. They are an important means for the consolidation
of the dictatorship of the proletariat and constitute a component part of
the national economy. In order for the state to realize the ‘four moderni-
zations,’ the posts and telecommunications must be modernized as quickly

as possible. The great leader Chairman Mao was very concerned about the
modernization of posts and telecommunications during his lifetime. A bril-
liant inscription was written by him for the communications workers as far
back as in 1941 which told them that 'You are the scientific eye and ear
that are far-reaching.' In 1956 when he was listening to a report by

the responsible comrades of the Ministry of Posts and Telecommunications,
Chairman Mao instructed that it was necessary to adopt modern communications
techniques and establish trunk lines for wave carriers and cables. In 1965
Chairman Mao sternly pointed out: ‘Posts and telecommunications are a back-
ward nerve which still lags 20 years behind. You must strive to catch up.'
These important instructions by Chairman Mao were a tremendous impetus and
effective encouragement to the workers in the postal and telecommunications
field. The postal and telecommunications workers and staff all over the
country were inspired to vigorously strive to modernize posts and tele-
communications and catch up with and surpass the advanced world level."

"Now postal and telecommunications offices are found everywhere, the communi—
cations lines and networks cover every corner of the country, various modern
techniques and equipment are being adopted on a large scale, and a profound
change is taking place in the communications and capabilities. Our country
is beginning to join the advanced world ranks in the postal and telecommuni—
cations technique."

28



It is a shame that our people in border towns only listen to foreign sta-
tions. In the western part, everybody listens to Mexican radio stations
and in the east, Honduran and Salvadoran. Unfortunately, and disgracefully
for Guatemala, we have the permanent and constant bombardment from Radio
Havana poisoning the minds of Guatemalans with Castroism, the worst opium
there is for Central America. We must neutralize its affect, not just by
having a powerful 100-kilowatt station, which has the same power as Radio
Havana, but by carrying more and better programs.

I insist on Radio Nacional being the best radio station in the country, not
because it is the most powerful, but because of the type of programs it
carries for the people of Guatemala, whom it is our duty to serve.

We must also carry news for our countrymen abroad, so that they do not feel
too lonesome wherever they are.

Ladies and gentlemen, on behalf of the government, I give you this radio
station which belongs to the Guatemalan people, whom it should serve.
Thank you. [applause]

cso: 5500

37



control unit has been lowered, and its efficiency strengthened, and it is
being commercialized as C-6140N.

THANKS
In closing, we would like to thank the staff of various sections of NIT

Telecommunications Research Laboratory who provided leadership and support
in the design development of the unit under discussion.

11460
cso: 5500

23



control procedure (hereafter referred to as high level procedure) is being
sought by the International Standards Organization and other bodies.

In view of these developments, we developed a High Speed Single Line Con-
troller for experimental use at NIT's Telecommunications Research Institute,
and as one system component for developing a new data link system that em-
ploys a high level procedure.

As a result of connecting this controller to the NEAC-3200, we verified that
it is suitable for high speed data transmission and that it uses the cir-
cuits efficiently. We were also able to verify that it can effectively be
used for new data link systems.

We would like to introduce the said High Speed Single Line Controller
(H-SLC) below and submit it for public scrutiny.

2. Outline of H-SLC

H-SLC was connected to the central processor. A synchronous communication
line was assigned in order to control full duplex transmission following
a high level procedure. H-SLC has the following characteristics.

(1) It carries out high speed data transmission at a communication speed
of 2.4 kilobit per second to 48 kilobit per second.

(2) There is no control with respect to data transmitted and it operates
on a bit oriented transparent mode which enables transmission of all bit
patterns.

(3) It can be used not only on specified data communication lines (private
lines) but on public communication circuits as well.

(4) By means of addition of frame check sequence (FCS), detection, and
supervision of received data format, transmitted data can be protected.

(5) In order to raise data transmission efficiency with the Dentral
Processing Unit (CPU), multiple channels can be used as transmission

channels. Moreover, transmission/reception buffer chain via program can
easily be effected, thus enabling continuous data transmission/reception.

3. Components and Specifications
3.1 Components

Structure of H-SLC is enumerated in Table 1 and its block diagram is indi-
cated by Figure 1.



(9)

(10)

interruption data transfer respectively. One more channel can be
used for transfer of transmitted data by means of C-6146 attachment.

Interface with Modem: C-6140A conforms to C.C.1.T.T. V24 directive
and C-6140B conforms to C.C.1.T.T. V35 directive.

Inspection and control of circuits: In order to discover circuit
obstacles, dislocation of Modem's CD (Carrier Detection) signal and
DR (Data Set Ready) signal is inspected for circuit dislocation
a@rror. Data transmission control is effected by CS (Commence Trans-

emission) signal, interruption into CPU by detection of CI (Call Indi-

cation) signal, DR signal, on and off control by ER (Peripheral
Equipment Ready) signal and RS (Request Transmission Service) signal.

3.4 Structure of Frame That H-SLC Supports

The basic structure of the frame that H-SLC supports and the respective
element's bit composition is indicated in Figure 2.

Key:

fOLOLO)  @ 11a

ory as nk | 22a TARE aR,

FLAPPER ITT em Re oy FARA ZONIIINIO
ATARI TF FURT4 AVE re By

C74 — NF BT 4 IF BeEyh
(HRT 4 Fo BXnE yb
FCS7{-M Fi 70x97 Fs 97U—F eRe

Figure 2. Basic Information Regarding Frame Composition

1. F sequence
2. A field

3. C field

4. (ata field)
5. FCS field

F sequence: flag sequence.....Bit construction is 01111110

A field: address field.. 8 bit
C field: control field. 8 bit
(Data field).. .8Xn bit

FCS field: block chec!

equence.....16 bit

Data field is employed only when necessary and is made up of 8Xn (n is a
discretionary number). FCS is made up of a surplus when a bit line-up
consisting of A, C (Data Field) is divided by a constituent polynominal

10