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ARNOLD SODERBERG Telefonaktiebolaget LM Ericsson. Responsible for design of ATME 2 system Fig. 2 Directing and responding equipment of ATME 2. Directing equipment is required at the exchanges from which, and responding equipment at the exchanges to which, measurements are to be made. The arrows indicate the direction of connection for measurement. sole exception is the interface unit for the international exchange, which is based on conventional relay technique in order to be able to interwork with the exchange equipment in the most suitable way. ATME N1 and N2 for national networks L M Ericsson have also delivered automatic transmission measuring equipment ATME N1 for national networks. A more advanced equipment called ATME N2 is at present being designed. It will contain the same measuring device as ATME 2. In national networks it is necessary to be able to make remote-controlled measurements of circuits proceeding from another exchange, which is possible with ATME N2. The corresponding need does not exist in the international network. This fact, and the circumstance that R2 signalling frequencies are used in the national variant, constitute the main differences between ATME 2 and ATME N2. Operation and measuring facilities, ATME 2 With ATME 2 attenuation measurements can be automatically made at 400, 800 and 2,800 Hz, noise measurements on the absolute value principle, and certain line signals and busy flash signals can be tested. The measurement program and line data are fed into ATME 2 from an electrical typewriter and tape reader, whereas the results of measurements are recorded on an electrical typewriter or tape punch (fig. 1). Measurements of circuits between two international exchanges are made with a directing equipment in the exchange from which the measurements are programmed and where the results are recorded, and with a responding equipment at the remote exchange (fig. 2). If ATME 2 is to be used for measurements both of outgoing and incoming circuits, it is provided both with directing and responding equipment. Otherwise it is equipped solely for the measurement task in question. The directing and responding equipments are therefore designed to work entirely independently of one another. They can be placed on separate racks and in separate exchanges. Directing equipment Input and output units I/O (fig. 3) are included in the directing equipment for input of measuring programs and out-
Fig. 3 ATME 2, block schematic. Directing and responding equipments connected to exchanges ot type ARM. put of the result. There may be two groups of such devices and each group can incorporate an electrical typewriter, a tape reader and, if desired, two tape punches. One group of devices can then be directly connected and the other group placed centrally and connected via modem. CCITT's alphabet no. 5 is used for communication in both directions. The typewriter is used for input of data common to all circuits and for printed output of the results. Input of circuit and route data is done with the tape reader. 23 One tape punch is used for recording of the results of measurement and the other for recording of input data for circuits which have been engaged too long and were therefore not available for measurement. The tape from the latter punch can be inserted in the tape reader for input, whereupon these circuits are reintroduced into the measuring program. The interworking between I/O units and the directing equipment is controlled by the interface IOG. The logic unit IOL is in charge of input, recording and output of data. The logic process in IOL and the transfer of data
Page 1: ERICSSON REVIEW 1 1974 ELECTRONIC T
Page 5 and 6: ERICSSON REVIEW NUMBER 1 1974 • V
Page 7 and 8: Fig. 1 LC oscillator, circuit diagr
Page 9 and 10: Fig. 4 RC oscillator, circuit diagr
Page 11 and 12: Fig. 7 Decadic electronic pushbutto
Page 13 and 14: Fig. 11 Electronic speech circuit,
Page 15 and 16: Fig. 15 (left) Frequency response,
Page 17 and 18: Coaxial Cable Systems: Operational
Page 19 and 20: Fig. 2 Pilot regulation. 12435 kHz
Page 21 and 22: Fiftieth Anniversary of Ericsson Re
Page 23 and 24: Fire-Alarm Installation in the Sama
Page 25 and 26: Fig. 5 Noise as a function of the l
Page 27 and 28: Fig. 7 Relative route construction
Page 29: Automatic Transmission Measuring Eq
Page 33 and 34: 600 ohms and the absolute value of
Page 35 and 36: uring signal received from the circ
Page 37 and 38: WORLDWIDE NEWS Worldwide expansion
Page 39 and 40: Joint telecommunications venture in
Page 41 and 42: The Ericsson Group With associated

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