Field Trial of Optical Fibre Cable-TV System Optical Fibre System for ...

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Product information Q CAD/CAM computer 183 Graphic work stations Local computer Miller Multioperation machine Wire spark machine Miller Spark sinker Spark sinker Injection moulding machines tooling are in two and a half and three dimensions. The tooling of standard components such as mould plates comprises mostly drilling and milling, which is programmed in two and a half dimensions. The tooling of shaping parts for the models as well as for tools and electrodes for spark sinkers usually requires three dimensions, figs. 4 and 5. The latter type of programming is normally complicated and results in large volumes of data and long programs for numerical control. Exchange of production information Fig. 7 System structure In practice this simulation facility has proved extremely valuable in the production of complicated pieces, since the trimming of the moulding tool is minimized and in certain cases even eliminated. The program has been developed at the Kristianstad factory. Preparation for manufacture With the CAD/CAM method the preparation for manufacture at the Kristianstad factory consists mainly of preparing the basic data for numerical control of different tooling machines. The machines available for numerical control are milling machines, spark tooling machines and a measuring machine. An important part of the preparation for manufacture is the production of models for verifying the mould. The models are usually made in an easily worked material, fig.3. Another stage of the preparation process might be to make prototype tools in, for example, aluminium before the mould for the production tool is completed. The programs for When the production information has been generated it is transferred to a local computer for temporary storage, fig. 7. The computer system is built up around the Digital Computer PDP-11 and the user software CAL11501/1 for numerical control. The software comprises functions for the administration of archives and for the output of production information as required. Before the information is transferred to a machine with numerical control it may have to go through a process that adapts it to the relevant type of machine. Any drawings that are required are produced with the aid of a plotter. Programs developed by Ericsson are used for the transfer. The information received from the product designers is also stored in the local computer. As regards the measuring machine the local computer is only used for data storage at present. Development work is in progress to enable the local computer to be used to store the process data for the injection moulding machines. Plans have been made to use the local computer also for supervision and reporting, but this will require further development work.
Rectifier for Mobile Telephone Systems Folke Ekelund and Per-Uno Sandström Ericsson Power Systems has developed a power supply system, BZA20106, for base radio stations in the mobile telephone networks marketed by Ericsson Radio Systems AB. The main part of the system is a rectifier. BMJ401001. based on high-frequency rectification without any previous transformation of the mains voltage. The authors describe the basic principle, structure and performance of the rectifier. UDC 621.396 cellular radio rectifiers power supplies to apparatus The mobile telephone systems 12 from Ericsson Radio Systems AB contain base radio stations that form part of cellular radio networks. Each cell contains a base station. Ericsson Power Systems has developed a system, BZA20108, which ensures uninterrupted power supply for such stations. The system comprises rectifiers, batteries, fuse unit for batteries, distribution units with automatic circuit breakers and supervision circuits. BZA201 08 can be extended in modules as required, by connecting units in parallel. In the standard version a system rack is equipped with two rectifiers BMJ401 001, a battery connection unit and a distribution unit, fig. 1. Rectifier BMJ401001 has a nominal current of 100 A and a continuous output power of 2.7 kW. If the battery requires a higher charging voltage after having been discharged, the regulation level in the rectifier can be changed over, either by means of an electric signal or manually, to the required charging voltage, e.g. 30 V (for a battery of 12 cells with the rectifier providing a float charge of 27 V). Only one voltage level is used, for Fig. 1 A power supply system BZA201 08 consisting of three racks. The left-hand rack, with the doors open, is equipped with, from below, a battery connection unit, two rectifiers BMJ 401 001 and a distribution unit
Page 1 and 2: ERICSSON REVIEW 4 1985 Field Trial
Page 3 and 4: Trial of Optical Fibre Cable-TV Sys
Page 5 and 6: Head end (HC] 280 Mbit/s Farsta aut
Page 7 and 8: 158 Switching equipment Fig. 7 Futu
Page 9 and 10: 160 Fig. 10 The teleconference room
Page 11 and 12: GERHARD GOBL Public Telecommunicati
Page 13 and 14: Fig. 5, above left Two-channel A/D
Page 15 and 16: Digital input signals Digital outpu
Page 17 and 18: Power ZAV 280/4 has individual powe
Page 19 and 20: Wavelength Division Multiplexing fo
Page 21 and 22: 172 Subscriber side BP-890 Controll
Page 23 and 24: Fig. 8 Transmission characteristics
Page 25 and 26: Most computer cabinets are 19" wide
Page 27 and 28: 178 Fig. 5 Modems in Series 7 Modem
Page 29 and 30: Computer Aided Production of Plasti
Page 31: Fig. 4 Product geometry displayed o
Page 35 and 36: I OR | OFU OS I CMUP HlsHi W±±±h
Page 37 and 38: 188 Fig. 6 The rectifier with the o
Page 39 and 40: Fig. 9 Rectifier BMJ A01 001 with t
Page 41 and 42: The Renewal of the London Undergrou
Page 43 and 44: 194 Rickmansworth, and the Loughton
Page 45 and 46: 196 Fig. 5 Optical fibre cable rout
Page 47 and 48: 198 In planning the optical fibre n
Page 49 and 50: Fig. 9 The digital telephone DIAVOX
Page 51 and 52: 202 Fig. 11 Transmission equipment
Page 53 and 54: 204 Fig. 2 Automatic testing of mul
Page 55 and 56: 206 Relative occurrence for F Fig.
Page 57 and 58: Fig. 5 Field testing of a 140 Mbit/
Page 59 and 60: 210 Fig. 7 The system down time as
Page 61 and 62: MTBF (years) Equipment 2-5 Transmul

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