the ericsson group - History of Ericsson - History of Ericsson

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Fig. 2 ARE exchange, (milking diagram FIR SL CD-KM II GV I GV GVM SR SLM FUR RS FLIR-L-T DO CD-KME ES IDS ss REG-I. REG-I IDG KS KMK KM TEI AIX MUX OMP REP TRS scs ADS 134 Incoming junction circuit Subscriber stage Code receivers in SL stage Second group selector stage First group selector stage Group selector marker Link circuit SL marker Outgoing junction circuit Register finder Outgoing junction circuit with alarm signal function L'nit for connection of SLM to IDS L'nit for transmission of control signals to CD-KM L'nit for transmission of control signals to GVM Electrical typewriter SLM identifier Sender finder Local register Incoming register I nit for identification of GV-KME and CD-KME Code sender for register signals Code receiver for pushbutton dialling Code receiver for register signals Terminal interface unit Alarm control unit Multiplexor for infcrwork between processors and other units Operational and maintenance processor Register processor Translation store Subscriber store Abbreviated dialling store Hot line A connection can be set up from a telephone reserved for this purpose to a predetermined number simply by raising the handset. Subscriber Service Centre A Subscriber Service Centre can be established which is common to an entire area. From the economical, and often too from the transmission point of view, it is advisable to concentrate to the Centre such equipment as is required for more complicated subscriber services. Apart from advanced interception services, the following additional services for example can be established at such a Centre: — Follow me, which implies that all calls to the subscriber can temporarily be redirected to another number. — Automatic waking service; the subscriber can order the service from a pushbutton or dial telephone, after which he is automatically rung up at the desired time. System Structure The hardware of ANA 30 contains data processing equipment, interface, and input and output units (I/O units). The software consists of program and data. Fig. 2 shows the ANA 30 hardware and the relay and selector equipment of ARE. The data processing equipment contains processors, central stores and multiplexors. In it is stored, the software and the data processed in accordance with given programs. Modular build-up is applied throughout with plug-in printed circuit boards as smallest units, which permits economical adaptation to the desired capacity. ERICSSON REVIEW No. 4, 1973
Fig. 3 Operational and maintenance processor OMP in ANA 30 The interface units usually carry out conversion between data information and electrical signals for direct communication with the relay and selector equipment of the exchange. Certain equipment carries out also other defined functions. The I/O units can be selected among electrical typewriters, display terminals, tape readers and tape punches, and provide the operation and maintenance staff with a convenient means of communication with processors, memories and interface units via the special operation and maintenance processor in ANA 30. Operators can easily change subscriber data written into the relevant memories in ANA 30, e.g. on connection or disconnection of interception service. The software is divided into small strictly limited units, so that a change of function usually affects only one unit. The total program volume is small compared to that for a SPC system, the data processing equipment of which also performs all marker functions. Owing to the limited program volume and the small modules the potential expansion provided by the SPC technique can be effectively utilized as the need arises. Through the use of software,changes which in the conventional technique are effected with a soldering iron can instead be effected by change of data codes in the memories of the data processing equipment. Data Processing Equipment The following account will be concerned with the processors, multiplexors and central stores of the data processing equipment. The Processor The processors of ANA 30 were developed especially for this system and carry the type designation APN 110. The processors can also be used in other contexts for which high requirements are placed on performance. The processor is small ERICSSON REVIEW No. 4, 1973 135
Page 1: 4 1973
Page 4 and 5: ITC — The International Teletraff
Page 6 and 7: 120 tions research methods have acq
Page 8 and 9: Seventh International Teletraffic C
Page 10 and 11: 124 At the opening session addresse
Page 12 and 13: 126 tions of state, and equivalence
Page 14 and 15: 128 Queueing Theory with Applicatio
Page 16 and 17: 130 Naturally some critical comment
Page 18 and 19: 132 of introducing new classes of s
Page 22 and 23: Fig. 4 Processor APN 110 CPU Centra
Page 24 and 25: Fig. 6 Bus connection of processor
Page 26 and 27: 140 in and additions to the control
Page 28 and 29: 142 case REP sends an order to SCS
Page 30 and 31: Fig. 9 (left) Trunking diagram for
Page 32 and 33: Manual Switchboard and Supervisory
Page 34 and 35: Fig. 4 Switchboard with sloping key
Page 36 and 37: Technicians within the Ericsson Gro
Page 38 and 39: Electrical voting system for Finnis
Page 40: TELEFONAKTIEBOLAGET LM ERICSSON PAN

the ericsson group - History of Ericsson - History of Ericsson

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