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6.1.
INTRODUCTION
The MDF for Multi module exchange is quite different from that of SBM RAX
exchange. The SBM RAX MDF is wall mountable and requires little support from
floor. MBM MDF does not require any wall support and is fixed on the floor. This
should be installed near the cable chamber where the underground cables are
coming. A trench is provided in the cable chamber where these cables enter. These
underground cables are jelly filled cables. These cables can be terminated on the
line side of the MDF directly. But care should be taken that they are terminated on
backmount frames from bottom to top. If the jelly filled cables are not to be
terminated directly on the MDF then through a cable joint these cables can be
converted to switch board cables of 100 pair each. This jointing is done in the trench
provided in the cable chamber. The trench portion can then be covered with wooden
planks. This MDF is in the form of verticals having backmount frames on both
sides, one for exchange side and the other for line side. This MDF is supplied in
multiples of 5 verticals. The no. of verticals to be installed depends upon the line
capacity of the exchange. The width of the MDF is fixed whereas length depends
upon the number of verticals supplied.
Note : Installation of C-DOT designed MDF only is explained in brief in this
Chapter. In case it is other than C-DOT design the corresponding MDF
installation manual supplied alongwith the MDF shall be referred for
installation of the MDF.
6.2.
MARKING
Suppose 10 verticals are to be installed. Draw a line at a distance of 200 mm from
the holes from where the cables will be leading in for termination on the verticals of
the MDF. The length of this line should be 2498 mm (10 verticals). Mark 4 points
at a distance of 260 mm, 1010 mm, 1509 mm, 2259 mm as shown in Fig. 6.1 (a).
These points are for fixing of expansion bolts.
6.3.
MDF INSTALLATION
Make 4 holes at the marked points shown in Fig. 6.1 (b) of depth 90 mm at diameter
10 mm, Fix 4 expansion bolts (item 43) at these points. BTM section assy-5 (item 1)
is to be fixed with the help of expansion bolts.
INSTALLATION MANUAL
Chapter 6.
MDF Installation
63
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