GB1300421A – Improvements in or relating to data transmission arrangements
– Google Patents
GB1300421A – Improvements in or relating to data transmission arrangements
– Google Patents
Improvements in or relating to data transmission arrangements
Info
Publication number
GB1300421A
GB1300421A
GB1909169A
GB1909169A
GB1300421A
GB 1300421 A
GB1300421 A
GB 1300421A
GB 1909169 A
GB1909169 A
GB 1909169A
GB 1909169 A
GB1909169 A
GB 1909169A
GB 1300421 A
GB1300421 A
GB 1300421A
Authority
GB
United Kingdom
Prior art keywords
processor
data
executive
processors
bit
Prior art date
1969-04-14
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1909169A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1969-04-14
Filing date
1969-04-14
Publication date
1972-12-20
1969-04-14
Application filed by Marconi Co Ltd
filed
Critical
Marconi Co Ltd
1969-04-14
Priority to GB1909169A
priority
Critical
patent/GB1300421A/en
1972-12-20
Publication of GB1300421A
publication
Critical
patent/GB1300421A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04Q—SELECTING
H04Q11/00—Selecting arrangements for multiplex systems
H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
H04Q11/0407—Selecting arrangements for multiplex systems for time-division multiplexing using a stored programme control
Abstract
1300421 Automatic exchange systems MARCONI CO Ltd 10 April 1970 [14 April 1969] 19091/69 Heading H4K In a TDM, PCM exchange, routine operations e.g. line scanning and metering are handled by individual stored-programme controlled processors while overall control including the transmission of data between processors is vested in an executive stored-programme controlled processor. The exchange is of the type described in Specification 1,252,526. The control arrangement comprises three executive processors 301 (Fig. 7) whose majority output as determined by majority vote circuit 303 is buffered at 304. The individual processors of which there may be more than one of each type depending on traffic loads comprises a concentrator processor 305; line scanner processor 306; register processor 307; sender processor 308; interrogation processor 309 (interrogation is the process of injecting marks into a switching network during path finding); call supervisory processor 310 (the dotted link means that interrogation marks passed via the network and detected by call supervisory circuits are passed direct to this processor instead of via the executive processor as is necessary for all other data interchange); drum translator processor 311; metering processor 312; and primary route selective processor 313. The individual processors all conform to the design shown in Fig. 9. Therein, data in respect of the 32 channels in each exchange time frame are temporarily buffered in cyclic store 424 prior to read-out via 421 to the peripheral equipments involved or write-in to a call store 428. The contents of the latter are constantly monitored by a control circuit 436 which determines whether the data should be processed (429) by the microprogrammes available from local programme store 430 or whether access to the executive should be made. In the latter case a demand order and an indication of the priority of the demand are transmitted over the four-wire highway 409 whereafter the data is transmitted at the instigation of the executive. Data in either direction on 409 is buffered in a special section 432 of the call store 428, while scratch-pad memory for the processor 429 is provided by section 431. Within the processor parallel 8 bit transmission is used, conversion to the serial mode utilized on highways 409 and 422, 421 being effected by converters 433 and 425 respectively. The executive processors are each as shown in Fig. 8. Herein a demand order arriving over an incoming pair of a highway 409 is detected by an interrupt circuit 413 which passes the order and its priority on to a control circuit 410 during a permitted scanning period. Control 410 determines a data-block storage portion of relevant priority in call store 401 and causes a crosspoint in matrix 408 to be closed so that the 10 bit data from the peripheral processor can be received. The first bit indicates the demand order so that the executive knows that when this bit changes all.the data has been received. The last bit is a parity bit. With parity failure only one further attempt at transmission is made. Data reception at the executive may be interrupted from either end if higher priority orders occur. In its turn, as determined by the priority and the number of preceding items of same priority, the data is processed using microprogramme, and time slot stealing techniques (Fig. 10, not shown) preparatory to its return to the same or a different peripheral processor via the matrix 408. It may be noted that every Nth incoming or outgoing word is specially reserved for indicating whether a message is ended or is continuing, circuits 411, 412 being provided for monitoring this. As before parallel bit transmission is used within the processor. The programme store is of the read-only type. It is provided with an address-modification facility so that a same programme may be used for different data blocks in the call store simply by adding an increment, representing the stage which processing has reached, to the starting address of any block. An arithmetic unit, bus system and address units suitable for use in any of the processors is described with reference to Fig. 10 (not shown). With reference to Fig. 1 (not shown) it is briefly mentioned that the exchange is connectible to concentrators and PCM interexchange junctions as well as via PCM codes/ decoders to audio links extending to strowger exchanges.
GB1909169A
1969-04-14
1969-04-14
Improvements in or relating to data transmission arrangements
Expired
GB1300421A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB1909169A
GB1300421A
(en)
1969-04-14
1969-04-14
Improvements in or relating to data transmission arrangements
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB1909169A
GB1300421A
(en)
1969-04-14
1969-04-14
Improvements in or relating to data transmission arrangements
Publications (1)
Publication Number
Publication Date
GB1300421A
true
GB1300421A
(en)
1972-12-20
Family
ID=10123644
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1909169A
Expired
GB1300421A
(en)
1969-04-14
1969-04-14
Improvements in or relating to data transmission arrangements
Country Status (1)
Country
Link
GB
(1)
GB1300421A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2371844A1
(en)
*
1976-10-21
1978-06-16
Wescom Switching
MICROPROCESSOR CONTROLLED TELEPHONE SWITCH
EP0016426A1
(en)
*
1979-03-15
1980-10-01
CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A.
Digital telephone exchange
1969
1969-04-14
GB
GB1909169A
patent/GB1300421A/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2371844A1
(en)
*
1976-10-21
1978-06-16
Wescom Switching
MICROPROCESSOR CONTROLLED TELEPHONE SWITCH
EP0016426A1
(en)
*
1979-03-15
1980-10-01
CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A.
Digital telephone exchange
Similar Documents
Publication
Publication Date
Title
FI74861B
(en)
1987-11-30
DIGITALOMKOPPLINGSNAET.
US3557315A
(en)
1971-01-19
Automatic telecommunication switching system and information handling system
GB2078059A
(en)
1981-12-23
Switching network
KR920003364B1
(en)
1992-04-30
Method and an apparatus for mutually convering different signalling systems
GB1491823A
(en)
1977-11-16
Time stages for pcm tdm switching networks
GB1081812A
(en)
1967-09-06
Data handling system
US3517123A
(en)
1970-06-23
Scanner control means for a stored program controlled switching system
CA2010288C
(en)
1997-02-25
Bit rate reservation in an asynchronous packet network
SE431143B
(en)
1984-01-16
SETUP AND DEVICE FOR CONNECTING CONTROL IN A DIGITAL TELECOMMUNICATION NETWORK OF TIME MULTIPLEX TYPE
EP0114822B1
(en)
1987-09-30
Communication arrangements for distributed control systems
GB1355048A
(en)
1974-06-05
Switching centre for a data network
US3524946A
(en)
1970-08-18
Multiregister for time division telephone switching systems
GB995447A
(en)
1965-06-16
Improvements in or relating to data communication systems
US3281537A
(en)
1966-10-25
Multiplex switching stage and its associated control circuits
GB1088341A
(en)
1967-10-25
Pulse signal exchange
GB1300421A
(en)
1972-12-20
Improvements in or relating to data transmission arrangements
GB1351408A
(en)
1974-05-01
Pcm t d m telecommunications exchange systems
GB1453687A
(en)
1976-10-27
Tdm digital telecommunications systems
GB1205306A
(en)
1970-09-16
Improvements in or relating to telecommunications systems
US4146748A
(en)
1979-03-27
Switching arrangement for pulse code modulation time division switching systems
US3868641A
(en)
1975-02-25
Control system particularly for interlocking installations for railway operation
US4339815A
(en)
1982-07-13
Multiplex connection unit for use in a time-division exchange
GB1139631A
(en)
1969-01-08
Time division communication systems
US4509168A
(en)
1985-04-02
Digital remote switching unit
GB1569284A
(en)
1980-06-11
Data packet switching system
Legal Events
Date
Code
Title
Description
1973-04-04
414F
Notice of opposition given (sect. 14/1949)
1974-02-13
414B
Case decided by the comptroller ** grants allowed (sect. 14/1949)
1974-02-27
PS
Patent sealed
1982-11-10
PCNP
Patent ceased through non-payment of renewal fee
