NTP 297-1001-106
                                             PREL., ISSUE 01D01
                                             May 25, 1978
























                       MAINTENANCE SYSTEM
                           DMS-100/200

























               (c)  NORTHERN TELECOM LIMITED, 1978
                 MAINTENANCE SYSTEM DMS-100/200








                        NTP 297-1001-106                    PAGE
                       PREL., ISSUE 01D01
                          May 25, 1978



                        TABLE OF CONTENTS
                                                      Page

1.   GENERAL...........................................1


2.   MAINTENANCE SUB-SYSTEMS........................... 1

     2.11 Maintenance Sub-System Interfaces............4


3.   MAINTENANCE CONCEPT...............................5

     3.02 Man-Machine Interface........................5

     3.04 Telescoping..................................6


4.   ROUTING AND REPORTING SUB-SYSTEM..................6

     4.02 Routing Mechanism............................7

     4.04 Logging Mechanism............................8

     4.06 Software/Hardware Alarm......................9


5.   MESSAGE TYPES.....................................9

     5.01 Inter-Maintenance Sub-System messages........9

     5.04 Messages from Maintenance SS to Routing
          and Reporting SS.............................10

     5.06 Messages between VDU and Routing Mechanism...11

     5.10 Messages between remote Maintenance
          Centers and the Trunks Maintenance SS........11

     5.11 Messages between the I/O Message System or
          Alarm Detection SS and the Maintenance
          sub-systems..................................12

     5.12 Messages from the CC Maintenance SS to
          Software Maintenance SS......................12





               (c)  NORTHERN TELECOM LIMITED, 1978
                 MAINTENANCE SYSTEM DMS-100/200








                        NTP 297-1001-106                    PAGE
                       PREL., ISSUE 01D01
                          May 25, 1978




6.   INTERACTION PROTOCOL..............................12

     6.02 Maintenance SS Interaction Protocol (MSIP)...12

     6.04 Man-Machine Protocol.........................13

7.   REFERENCES........................................13

8.   ABBREVIATIONS.....................................14








































               (c)  NORTHERN TELECOM LIMITED, 1978
                 MAINTENANCE SYSTEM DMS-100/200








                        NTP 297-1001-106                    PAGE
                       PREL., ISSUE 01D01
                          May 25, 1978



                             FIGURES

FIGURE       TITLE                                          PAGE


2-1          Block Diagram.  Maintenance Sub-systems........F-1

2-2          VDU Screen.....................................F-2

4-1          Routing and Reporting Sub-systems..............F-3

6-1          Sub-system Interaction Protocol................F-4

6-2          Man-Machine Protocol...........................F-5




































               (c)  NORTHERN TELECOM LIMITED, 1978
                 MAINTENANCE SYSTEM DMS-100/200








                        NTP 297-1001-106                   PAGE 1
                       PREL., ISSUE 01D01
                          May 25, 1978