(19)
(11)EP 0 231 630 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
14.06.1989 Bulletin 1989/24

(43)Date of publication A2:
12.08.1987 Bulletin 1987/33

(21)Application number: 86309852.1

(22)Date of filing:  17.12.1986
(51)International Patent Classification (IPC)4H04Q 11/04, H04Q 3/545
(84)Designated Contracting States:
AT BE CH DE ES FR GR IT LI NL SE

(30)Priority: 22.01.1986 GB 8601545

(71)Applicant: NORTHERN TELECOM LIMITED
Montreal, Quebec H2Y 3Y4 (CA)

(72)Inventors:
  • Waters, Derek Brian
    Chelmsford Essex CM2 9PN (GB)
  • Sexton, Michael James
    Basildon Essex (GB)

(74)Representative: Ryan, John Peter William et al
Nortel Limited Patents and Licensing West Road
Harlow Essex CM20 2SH
Harlow Essex CM20 2SH (GB)


(56)References cited: : 
  
      


    (54)Transmission equipment


    (57) A data transmission equipment, known as a primary digital multiplex (PDMX) consists of a bus structure formed by parallel lines on a printed circuit board, with the circuit units (1,2,3,4,5) on printed circuit cards set at right angles to the bus structure. The circuit units include a control unit (1,2) also called a core facilities unit, which acts as an interface to one or more 2Mb/sec. trunks, and so-called tributary units (3,4,5) which give access to subscriber and other outlets.
    Various networks using one or more such PDMX equipment are described.
    The signalling and control arrangements for the equipment use a signalling processing unit (2) and a tone processor (6). The signalling processing unit monitors the bus for signals and line conditions and issues signals appropriately. The tone processor functions in a generally similar manner.







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