1959 - History of Ericsson - History of Ericsson

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Fig. 6 122 x 8180 Block schematic of exchange trunk equipment At the top is seen a circuit designed for continuous signalling T Combined line and hybrid transformer ST Signal transformer TM V.F. receiver FLR Junction relay set (line side) DR Pad relay set DRof Pad relay set for circuits without terminal amplifier. Also contains filter equipment matching the line cut-off frequency „„ ^Junction relav set (exchange side) FSfRJ KK M.D.F. is 7-8 digits per second. The possibility has been foreseen of inter-exchange transmission of other than digit information by using a sixth frequency. Bypath Equipment Marker selector The registers are connected to a marker via a marker selector. Each marker selector unit has ten inlets and ten outlets. Through-connection is on 40 wires. The marker selector is made up of five normal type crossbar switches with 8-pole contact bank. The marker selector outlets need not be graded since not more than ten markers are installed in any one exchange. Marker Every marker consists of four main components: a receiving component which receives information from the register and from the incoming line; a traffic group component which, by group testing of the outgoing routes, is constantly informed of their free or busy condition; a link testing component which tests the A, B and C links; and a supervisory component which supervises the work of the marker. With the guidance of the information received, the marker determines the fee and immediately sends a fee-determination signal to the debiting link circuit SNR-ZIO.The mean time of marker occupation is 0.7 sec.
Fig. 7 Relay room FSR x 2484 Trunk Equipment A block schematic of the trunk equipment is shown in fig. 6. Every trunk circuit terminates in the transit exchange on an FSR which in turn is connected to either GVI or GVU, or both, according to the direction of traffic and to whether the circuit is one-way or two-way. The same type of FSR is used for one-way and two-way outgoing circuits. A two-way circuit requires very little more relay equipment than an outgoing, and there is therefore no reason to use separate relay sets for the two types of circuit. A simpler form of junction relay set FSIR, on the other hand, is used for oneway incoming circuits. The same type of junction relay set may be used on two-wire and four-wire circuits. Matching to existing line signalling systems is effected by the use of different types of FLR in the repeater station. Translation of signals between the exchange and line sides of junction relay sets is standardized. Each twowire circuit is connected to a combined line and hybrid transformer with four-wire connection to the exchange side of the junction relay set. FSR and FSIR perform the functions associated with traffic direction, establishment of line connection, repeating of signals through the exchange, supervision of the circuit and automatic fault indication. They perform no 123
Page 1: 4 1959
Page 4 and 5: Ericovox, the One-Piece Loudspeakin
Page 6 and 7: Fig. 3 X 8156 Block schematic of co
Page 8 and 9: Fig. 5 x 8163 The Ericovox, L M Eri
Page 10 and 11: Fig. 8 X 2443 Sending frequency res
Page 12 and 13: 108 The Ericovox meets the requirem
Page 14 and 15: Fig. 3 Grouping of components in wi
Page 16 and 17: Fig. 9 X 8132 Case with pyramid-sha
Page 18 and 19: Fig. 12 X8134 Instrument with base
Page 20 and 21: Fig. 18 X8135 The locations of the
Page 22 and 23: Gothenburg Automatic Transit Exchan
Page 24 and 25: Fig. 3 x 8181 Block schematic of gr
Page 28 and 29: Fig. 8 X 2472 Link circuits for ori
Page 30 and 31: Fig. 10 X8182 Traffic supervisor's
Page 32 and 33: Fig. 2 X8167 Relay switchboard AMD
Page 34 and 35: 130 Priority The switchboard is des
Page 36 and 37: Crossbar Exchange Installed on Larg
Page 38 and 39: L M Ericsson to Undertake First C.T
Page 40: The Ericsson Group Associated and c

1959 - History of Ericsson - History of Ericsson

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