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Rack
The rack has a light-grey enamel finish and is made of extruded sheet steel.
Its dimensions are: height 1948 mm, width 1025 mm and depth 250 mm,
At the top of the rack are fuses for all switching units (fig. 6). Blocking
buttons for the exchange lines are placed on the respective relay sets.
Fig. 6
Fuse and lamp panel
The rack has a retractable wheel and can be swung out from the wall to
allow access to the back of the P.A.B.X. (fig. 7). The front is fitted with
locked doors and the back with cover-plates, also with locks (fig. 8).
The rack is supplied cabled for its maximum capacity. The fixed cabling on
the rack terminates in multipole jacks into which the relay sets and switches
are plugged. The incoming cables enter the rack at the top left-hand corner
and terminate on an M.D.F. located under a panel on the left-hand side of
the rack (fig. 9).
Fig. 7
a. Steel ball
b. Wheel
Operator's Console
All switching operations are done with push-button keys. In each key are one
or two lamps which facilitate the supervision of established connections. Five
such keys are mounted as a unit. The push-button contact springs and lamps
are wired to a multipole plug. The key units plug into the console (fig. 10).
The entire console is covered with a grey plastic casing. The plastic tops of
the buttons are easily removable for change of lamp or engraving. The handset
plugs into the console. The dial is used only for setting up external calls and
is placed on the right of the console, as dialling is normally done with the
right hand.
Fig. 8 Fig. 9
Fig. 8
AKD 735 swung out from wall
Fig. 9
Position of M.D.F.
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