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# Proceedings of the IEE - Part B: Electronic and Communication Engineering

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Displaying Results 1 - 25 of 47

Publication Year: 1960, Page(s):67 - 69
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• ### The Highgate Wood experimental electronic telephone exchange system

Publication Year: 1960, Page(s):70 - 80
Cited by:  Papers (4)
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An experimental public service telephone exchange is to be installed at Highgate Wood in North London. It has been developed in order to gain experience of the problems posed by introducing electronic exchanges into the public network. It meets a full and flexible facility schedule, and will test a variety of electronic time-sharing and commoncontrol techniques in the field. Speech and other signa... View full abstract»

• ### The trunking of 100-channel t.d.m. exchanges

Publication Year: 1960, Page(s):81 - 87
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The trunking of electronic telephone exchanges is not a rigid framework which must be specified before the design of an exchange suitable for the rigours of the public service can be undertaken.Changes are repeatedly needed to accommodate other developments, so that a common basis of various arrangements is sought. For exchanges for which a multiplex system of a large number of channels is suitabl... View full abstract»

• ### System operation of a t.d.m. switched highways electronic telephone exchange

Publication Year: 1960, Page(s):88 - 93
Cited by:  Papers (1)
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The Post Office and its principal telephone manufacturers have developed jointly an experimental electronic telephone exchange which will be installed at Highgate Wood Exchange in North London. The exchange is designed to operate on time-division-multiplex principles using switched highways, and these techniques are used throughout the common control apparatus. The paper describes the setting up o... View full abstract»

• ### Outlines of a t.d.m. two-wire telephone switching system and its control

Publication Year: 1960
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The application of certain basic principles of switching and logic system design in electronic telephone switching systems is illustrated in an outline description of a fully-solid-state switching system for exchanges having some 10 000 lines and 1000 junctions. Speech transmissionis ensured on a one-wire time-multiplex p.a.m. basis using the principle of resonant transfer between modem circuits. ... View full abstract»

• ### A mobile tactical electronic telephone system

Publication Year: 1960, Page(s):104 - 117
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The design of a 4-wire light-weight electronic automatic telephone system intended for tactical use by the United States Field Army is described. The reasons for the choice of a time-division multiplex system using semiconductors are given. The error-correcting signalling system employed and the means adopted to achieve an easilytransportable rapidly-installed system are described. The system incl... View full abstract»

• ### Discussion on "Time-division-multiplex exchanges - I"

Publication Year: 1960, Page(s):117 - 118
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• ### Coded-pulse parallel-transmission system

Publication Year: 1960, Page(s):119 - 121
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First Page of the Article
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• ### Signal injection in time-division-multiplex systems with resonant transfer

Publication Year: 1960, Page(s):122 - 126
Cited by:  Papers (1)
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For signal injection in time-multiplex systems operating on the resonant transferÂ¿ principle two methods are described. In 2-wire systems the injection is accomplished by means of a pulse circuit similar to that of the subscriber but without a low-pass filter. For charging the injector-circuit capacitor in the pause between pulse positions a specially designed signal generator is connected to th... View full abstract»

• ### Crosstalk in T.D.M.-P.A.M. switching systems due to capacitive coupling in the highway-interconnecting network

Publication Year: 1960, Page(s):127 - 133
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Expressions are derived for the inter-highway crosstalk due to capacitive coupling in the highway-interconnecting network as functions of the parameters of the transmission path and the time shift between the switching control pulses. An analogous relation can be derived for the inter-highway crosstalk due to the mutual inductance between neighbouring highways; however, this kind of coupling can e... View full abstract»

• ### A current-controlled t.d.m. transmission path

Publication Year: 1960, Page(s):134 - 142
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The paper deals with the design of a current-operated t.d.m. transmission path suitable for use in an electronic telephone exchange employing 4-wire transmission. Direct replacement of the thermionic valve circuits used in the proposed Highgate Wood exchange with equivalent transistor stages raises difficulties. These are enumerated, and the advantages of current operation are outlined. A detailed... View full abstract»

• ### An experimental electronic telephone exchange on a time-division basis

Publication Year: 1960, Page(s):143 - 148
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The paper describes an electronic telephone exchange based on time-division techniques but using a common pulse supply circuit for its controls and speech-path carrier pulses. A semi-highwayÂ¿ switching system is used. Each subscriber is allotted a fixed pulse of a train of pulses. Connections between a calling and called subscriber are made either by shifting the phase of the pulse at the outgoi... View full abstract»

• ### Electronic telecommunication switching for the 412-L Air-Weapons Control Centre

Publication Year: 1960, Page(s):149 - 150
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First Page of the Article
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• ### Discussion on "Time-division-multiplex exchangesߞII"

Publication Year: 1960, Page(s):150 - 151
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• ### Highgate Wood electronic telephone exchange: facilities and problems of compatibility

Publication Year: 1960, Page(s):152 - 159
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The problems involved in introducing a new type of exchange into an existing telephone network are discussed. Some of the lesser-known facilities given by a modern automatic exchange are described and reference is made to how they will be provided at Highgate Wood. View full abstract»

• ### Channel selection in Highgate Wood electronic telephone exchange

Publication Year: 1960, Page(s):160 - 164
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In the Highgate Wood electronic telephone exchange, external lines connect to time-division-multiplexed channels on group highways and thence, via coincident channels on further highways, to either the register or other lines on the exchange. The channel selector completes such connections singly by selecting the channel to be used and sending the channel pulse to the appropriate connection memori... View full abstract»

• ### Magnetostrictive delay-line stores and some logical applications

Publication Year: 1960, Page(s):165 - 176
Cited by:  Papers (1)
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Four types of magnetostrictive delay-line stores, two of which have delay of 100 microsec and the others 900 microsec, are used in the Highgate Wood electronic telephone exchange to perform storage and logical functions. These stores were developed separately for use in three sections of the exchange. Techniques employed in the design of these stores include the use of thermionic valves and transi... View full abstract»

• ### Line-terminating equipment for a t.d.m. electronic telephone exchange

Publication Year: 1960, Page(s):177 - 187
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The paper discusses the design and engineering of the lineterminating equipment at an electronic exchange using the pulseamplitude modulation system. The exchange will form part of the existing public network of lines, and to cater for the various types of line connection involved, a number of different designs of electronic and electro-mechanical equipment is necessary. Descriptions of the equipm... View full abstract»

• ### Speech and signalling switching equipment in the Highgate Wood electronic telephone exchange

Publication Year: 1960, Page(s):188 - 199
Cited by:  Papers (1)
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The paper gives details of the common time-shared paths used for the switching of speech connections, the transmission of tones and the transmission and detection of line signals for a 3200-line electronic exchange to meet the facility requirements for public service. The exchange will work with the existing telephone and bell and existing junction signals. Exchange lines of all types terminate on... View full abstract»

• ### Principles of connection control in an electronic telephone exchange by the use of magnetic drums

Publication Year: 1960, Page(s):200 - 202
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The paper describes some functions of storage within a telephone exchange, and, in particular, the application of a magnetic drum to this storage in an electronically controlled time-division-multiplex telephone exchange. It serves as an introduction to supporting papers relating to the methods of application within a particular exchange system. There is discussion of the methods of use of the dru... View full abstract»

• ### Magnetic-drum storage and originating call detection in an electronically controlled t.d.m. telephone exchange

Publication Year: 1960, Page(s):203 - 206
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The paper pertains to the detection and connection of calling subscribers to the equipment of an electronically controlled t.d.m. telephone exchange. In particular, it refers to the types of information for which storage is required, to the method of providing this on a magnetic drum and to the logical manipulation of this information when a call occurs. View full abstract»

• ### Exchange code translation in a magnetic-drum-controlled electronic telephone exchange

Publication Year: 1960, Page(s):207 - 209
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In an electronic telephone exchange to be installed shortly at Highgate Wood a magnetic drum is used to store information relating to the routing of calls through the exchange and the external network. Exchange codes are translated into the appropriate routing instructions by reference to the drum store. View full abstract»

• ### Terminating call connections in a magnetic-drum-controlled electronic telephone exchange

Publication Year: 1960, Page(s):210 - 212
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In an electronic telephone exchange shortly to be installed Highgate Wood and using a time-division-multiplex principle, magnetic drum is used to search for semi-permanent information stored on the drum relating to called subscribers' lines. A temporary store associated with each line is used to determine whether a connection possible, and if so, information relating to the line is passed to other... View full abstract»

• ### Subscribers' meter recording in an electronic telephone exchange

Publication Year: 1960, Page(s):213 - 218
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The paper describes a method of meter recording within an electronic t.d.m. telephone exchange in which a magnetic drum is the basic storage medium. The meter records consist of the total number of unit fees that have accrued to each line on the exchange. Shared lines have a separate meter record for each party. Under present conditions, a unit fee corresponds to one local call; these calls are no... View full abstract»

• ### Register equipment for a time-division-multiplex electronic telephone exchange

Publication Year: 1960, Page(s):219 - 227
Cited by:  Papers (1)
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Register equipment has been designed for use in a time-division-multiplex electronic telephone exchange. Calls using the register do so by means of trains of pulses occurring at different times in a cycle but on a single common highway. Information is therefore stored and processed using the same pulse positions. Storage and logical gating circuits are thus time shared among all calls being set up... View full abstract»