Selection and Testing of Electronic Components for LM

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Fig. 3 Line unit for 10 magneto lines Fig. 4 Cord pair unit AP Answering cord RP Calling cord SK-RK 3-posltlon switch with speech position SK and ringing position RK SL Clearing drop indicator LM Ericsson have long operational experience of cord winders obtained from the portable switchboards ABM 10, which have withstood severe trials under field conditions. The cord winder is a corner stone in the ABJ construction and has greatly contributed to the reduction of the switchboard volume. The cord pair unit also includes a 3position switch and a clearing drop indicator. The switch, which has small dimensions, has a frame and lever arm made of grey plastic. Line equipment The line units are available in two variants, one for magneto lines, fig. 3, and one for CB junction lines. Among other things the line units contain a drop indicator jack strip. The CB junction line units also contain a printed board assembly with line components. Position equipment The dial and other control devices that are common for the whole of the exchange have been assembled in a position unit. The front of the unit is covered with a plate of green plastic. Supervision equipment A flag indicator, battery indicator and jacks for checking cords etc. are assembled in a supervision unit. ABJ 101 in combination with automatic exchange AKD 860 For certain telecommunication requirements in rural areas LM Ericsson can offer a new, economical system consisting of the magneto switchboard ABJ 101 in combination with an automatic exchange (PAX) AKD 860, fig. 5. This system is intended for very small communities and can be used while waiting for the demand to increase sufficiently to justify a changeover to a fully automatic rural exchange system. The combination of these two standard
Fig. 5 ABJ 101 in combination with automatic exchange AOK 860 gives dialled calls in a the densely populated area and manually extended calls in the surrounding rural area. Both subscriber categories have the possibility of national and international calls via the operator in the manual switchboard products gives subscribers in densely populated areas many of the advantages of automatic calls and at the same time offers remote subscribers in the surrounding areas telephone service via the modern manual switchboard. All subscribers have the possibility of national and international calls via the operator at the manual switchboard. A subscriber in AKD 860 calls the operator by dialling a single-digit number. Calls within AKD 860 are set up automatically and within ABJ 101 manually. Calls between subscribers in ABJ 101 and AKD 860 are set up by the operator. Exchange AKD 860 is built up of plug-in units, which means simple and fast installation and low maintenance costs. This construction permits extension in stages and facilitiates any future move of the equipment to another location. The small dimensions enable the system to be installed in suitable existing premises, and thus no special building is required. The operator at the manual switchboard handles the charging for trunk calls and in certain cases this is done in cooperation with the trunk operator in the superior exchange. Accessories for ABJ 101 139 Power equipment For power supply four dry-cell batteries BKA 1002 for 1.5 V and 50 Ah are recommended. These are placed in battery box BKY 1012. Main distribution frame Main distribution frame NBA is recommended for switchboards with more than 40 lines. A main distribution frame, but without line fuses, can also be obtained through using double the number of connection boxes. Telephone sets Ordinary magneto telephone sets are connected to the exchange, for example LM Ericsson's model DAG 11102/8. External bell When an acoustic signal is needed outside the switchboard, a bell KLD 1303, can be connected. Various outdoor bells can also be used. Wooden sides ABJ 101 can be adapted to the environment at the installation site. The switchboard is delivered with teak sides. Sets of side pieces made of jacaranda, natural pine, walnut or other types of wood can be supplied on special request.
Page 1: ERICSSON REVIEW 3 1977 SELECTION AN
Page 4 and 5: Selection and Testing of Electronic
Page 6 and 7: Fig. 2 Curve tracer The special typ
Page 8 and 9: Fig. 6 Humidity test High air humid
Page 10 and 11: 100 Type of check Type of component
Page 12 and 13: Fig. 12 Computer-controlled test sy
Page 14 and 15: 104 Fig. 16 Comparison of fault tra
Page 16 and 17: Fig. 2 Cable groups with the conven
Page 18 and 19: 108 Fig. 9 Take-up stand lor connec
Page 20 and 21: Insulation: Solid polyethylene Cond
Page 22 and 23: New Telephone Set Arne Boeryd and G
Page 24 and 25: Digital Line Equipments for 8 Mbit/
Page 26 and 27: Fig. 5 ALBO network for automatic e
Page 28 and 29: Fig. 8 Block diagram of the line te
Page 30 and 31: Fig. 13 Small repeater housing of t
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Page 34 and 35: 124 References 1. Lindquist, S. and
Page 36 and 37: LARS G ERICSSON AKE PERSSON Telepho
Page 38 and 39: 128 Fig. 3 Standardization of progr
Page 40 and 41: 130 Fig. 6 The control room in an A
Page 42 and 43: Table 3 Number of component faults
Page 44 and 45: 134 ence this as congestion or a "s
Page 46 and 47: ABJ 101-the Modern Public Magneto S
Page 50 and 51: " The maximum number of lines that
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Selection and Testing of Electronic Components for LM

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