Colour Display System SEMIGRAF 240 - The history of Ericsson

More documents

Recommendations

Info

94 Fig. 3 Changing subscriber categories from the operating centre trol system ANA 30 by means of alarms and printouts administered by the operation and maintenance processor, OMP. Faults in the switching system can also be found with the aid of ANA 30, since its printouts show the switching processes in the form of digits and control signals. Other printouts specify the device groups that exceed the permitted error level limits (STU, KS, KM). These printouts can indicate faults in the switching system and the network. After the introduction of ANA 30 it has also been possibleto keep the switching system in better condition than before, since the latter system has gradually been adjusted to the exacting signalling and time conditions that apply for ANA 30. In spite of the fact that ANA 30 gives detailed fault information, the supplementary fault reports from the subscribers are of importance, for example when there is a fault in the signal reception from the push-button sets. Experience from ANA 30 in Arhus Centrum shows that after a running-in period the system is very reliable. The operational statistics show that the duplication of most of the function units in ANA 30 ensures that large operational disturbances are to all intents and purposes eliminated. Saving in personnel By the middle of 1978 115 000 lines in the Arhus area were connected to ARE 11 exchanges with ANA 30. If these subscribers were to have been served by ARF 100 instead, 21 technicians would have been required for the operation and maintenance of the exchanges, not including the MDF staff. It is estimated that after the modernization with ANA 30 the number of technicians required will be reduced to 18, a saving of 3. Furthermore it is expected that the staff will be kept at this number during the coming years despite the fact that the number of subscribers is expected to increase by 8 % annually. In addition there is a saving of 1/2 man year per year because such administrative tasks as category changes, route changes etc. are carried out by means of commands.
Fig. 4 Tmnking diagram with ARF 100 in Arhus, modernized by the addition of control system ANA 30 to ARE 11 SLM Subscriber stage marker GVM Group selector marker IDS Identification unit for A-subscriber STU-L Signal transfer unit for SR (SR - cord line relay set) STU-I Signal transfer unit for FIR (FIR - junction line relay set) SS Code sender finder KMK Code receiver tor tone frequencies KS-MFC Code sender lor MFC GV-KME Matching unit for group selectors IDG Identification unit KM-MFC Code receiver tor MFC TCP Traffic control processor OMP Operation and maintenance processor SCS Subscriber category store TRS Translation store ADS Abbreviated dialling store Just the disconnection and reconnection of bad payers by command saves 1/3 man year per year among the MDF staff. Even though a saving in personnel is important this is not the main purpose of the modernization. The main objective is to obtain a system that offers many new facilities and services and which can later be equipped with still more, for example common channel signalling 2 . Training On the basis of the experience gained hitherto the training requirements can be described as follows. Technicians with electromechanical training should attend a basic course, after which they can handle the exchange and repair common faults. This basic course should include the following subjects: 1. Binary and hexadecimal number systems 2. Basic system knowledge 3. System structure 4. The traffic control processor, TCP 5. The operation and maintenance processor, OMP IIGV KS-MFC IDG 7 hrs 4 ,, 3 ,, 14 ,, 14 ,, 95 6. Commands 21 ,, 7. Subscriber category store, SCS 7 ,, 8. Translation store, TRS 10 ,, 9. Signal transfer units, STU-L and STU-I 4 ,, 10. Traffic recording and statistics 7 ,, 11. Flow charts and program knowledge 14 ,, 12. Operating a processor panel 7 ,, 13. Fault tracing 14 ,, 14. Exchange tester 14 ,, Total 140 hrs After a year's work with the system, exfended ANA 30 training can suitably be provided to give a more detailed insight into the problems. Such a course, which would enable the technician to handle difficult fault clearing problems, could include the following: 1. Microcomputer course 24 hrs 2. Processor APN 110, theory 24 ,, 3. Program knowledge 48 ,, 4. TRS, build-up 4 ,, 5. TRS, data 28 ,, 6. APN 110, build-up 24 ,, 7. Multiplexor, MUX 8 ,, 8. Identifier for GV, IDS 8 ,, 9. TRS-SCS 16 ,, 10. The operating manual 8 ,, 11. Follow-up 8 ,, Total 200 hrs Together, these courses provide a sound syllabus. The personnel are free to attend the extended course or not. Even though it may not be actually necessary to train all personnel the costs involved are small and it helps to maintain the interest and sense of responsibility of the personnel. In 1978 an extended course for 6 technicians will be arranged in Arhus. References LMeland, F. and Rishoj, E.: Crossbar Exchanges in Arhus Become SPC Exchanges. Ericsson Rev. 54 (1977):2, pp. 86-89. 2. Andersen, H. and Pedersen, V.K.: Field Trial with Common Channel Signalling. Ericsson Rev. 55 (1978): 1, pp. 20-27.
Page 1: ERICSSON REVIEW 3 1978 COLOUR DISPL
Page 4 and 5: Colour Display System SEMIGRAF 240
Page 6 and 7: 88 Fig. 4 The three beams red, gree
Page 8 and 9: 90 Fig. 8 Keyboard for SEMIGRAF 240
Page 10 and 11: Operational Experience of ANA 30 in
Page 14 and 15: New Generation of 120 and 480-Chann
Page 16 and 17: 98 Fig. 3 Translation of basic supe
Page 18 and 19: 100 Fig. 6 Line terminating shelf s
Page 20 and 21: Fig. 10 Branching for direct termin
Page 22 and 23: Fig. 16 Housing for one line repeat
Page 24 and 25: AXB 20 - Operation and Maintenance
Page 26 and 27: Fig. 4 Display terminal connected t
Page 28 and 29: 110 Fig. 8 Procedure for changing d
Page 30 and 31: System data for AXB 20 Application
Page 32: TELEFONAKTIEBOLAGETLM ERICSSON ISSN

Colour Display System SEMIGRAF 240 - The history of Ericsson

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?