Lesson 2/Learning Event 1
LESSON 2
LINE TERMINATIONS AND DISTRIBUTION FRAMES
TASK:
Describe the purpose, function and types of distribution
frames, telephone cables, and terminal blocks, describe the
purpose of cable color coding and cable records.
CONDITIONS:
Given information about the distribution frames, telephone
cables, cable color coding, terminal blocks, and cable
records.
STANDARDS:
Demonstrate competency of the task skills and knowledge by
responding to the multiple-choice practice exercise; select
the ONE answer that BEST completes the statement or answers
the question covering line terminations and distribution
frames with 70 percent accuracy. (This objective supports
task 113-616-1007, Activate a Circuit.)
REFERENCES:
FM 11-486-12, DCAC 310-70-1, Volume III, FM 11-487-3.
Learning Event 1: DISTRIBUTING FRAMES
Distributing frames are open metal frameworks which provide neat and
accessible terminating facilities for outside cable pairs and in-house
wiring to patching bays and equipment items.
Protector groups mounted on
the framework give lightning and surge protection to station equipment. On
all types of distributing frames, cross-connections between terminal blocks
are made by means of relatively short lengths of paired wires, called
Distributing frames enable the greater part of the wiring in a
technical control center to remain permanent. If, for example, a cable pair
connection must be changed from one patch bay to another, it is only
necessary to move a jumper.
Distributing frames used in typical control
centers include main distributing frames (MDF), intermediate distributing
frames (IDF), and combined distributing frames (CDF).
An example of a
typical CDF is shown in figures 2-1 and 2-2.
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