Lesson 1/Learning Event 5
c. Circuit Conditioning Bay. The circuit conditioning devices and test
sets are distributed so as to process the signals passing from the VF
primary patch bay to the VF equal level patch bay.
Pads, attenuators,
amplifiers, and equalizers are included in the circuit conditioning bays.
Included also is conditioning equipment for two-wire, four-wire conversion.
An extensive line of test equipment is mounted in these bays.
The VF
signaling devices are controlled by DC E&M signaling leads.
The term E&M
denotes the direction of signaling. Detailed description of this term will
be given later.
d. Cabinet Line-Up. The cabinets indicated in figure 1-25 are lined up
according to the functions they perform. However, you should not conclude
that this arrangement is the only possible one. Cabinets may be placed in
the room to satisfy several requirements, including convenience to
operators, separation of operating functions, convenience for maintenance,
appearance, technical accommodation, and possibly others.
Further, almost
all wiring is accomplished through main-frame terminal blocks for
convenience in strapping and testing.
An illustration of an actual
technical control operating position is shown in figure 1-25.
Note the
absence of patch cords in the jackfields.
Since all jacks are normal-
through, there is no need for patch cords unless circuit or equipment
substitution becomes necessary.
An abundance of patch cords in the
jackfields usually indicate equipment problems or operating difficulties.
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