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   How to find you MDF position from your Equipment Number | iNFERNO 1996

  A subscriber's line can be identified within a concentrator by the number
 of the equipment to which it is connected. The equipment number is within
 the range 0-2047 for each concentrator, if there is more than one 
 concentrator within the exchange the the equipment numbers expand in 
 multiples of 2048.

  The shelves in the T.E. containing the groups of Subscriber Line Units 
 (SLUs) are labeled ALUS xx yy, where xx is the concentrator No. and yy is
 the shelf group No. within that concentrator. The MDF blocks are 
 similarly marked.
 
  To determine the MDF block and circuit No. of a subscribers line, given
 the Equipment & Concentrator No. :
 
    o Divide your EN by 2048, which gives a number and a remainder. The
       remainder is the Subs Line No. within that concentrator.
    o Dividing the remainder by 192 gives the Shelf Group No. and a new
       remainder. This remainder gives the Circuit no. in that shelf group.

  e.g Concentrator 3, EN 10720: 10720/2048 = 5.480.. Line No. 480 in Conc 3.
       480/192 = 2.96, giving ALUS 3-2, Circuit 96.
       
    o For Mark 2 SLUs: Divide the circuit No. by 8 to give the SLU No.
    o For Mark 3 Plessey SLUs: As above, but if the remainder is odd then
       add one to the SLU No.
    o For Mark 3 GEC SLUs: Divide the circuit No. by 16 to give the SLU No.