b. Practical value of records.
Records are the only means operating
personnel have for maintaining information on past events. Without records
they cannot know past operating and maintenance experience.
Further,
without the experience data, circuit engineers lose a great deal of time in
planning for circuit changes to accommodate variations in traffic patterns.
c. Types of records.
Records are usually standardized according to
instructions from the DCA, and are maintained according to DCAC 310-70-1.
However, variation is permitted so as to give flexibility to the operation.
An example of an approved filing system for use in a technical control
facility follows.
(1) Circuit history file (figure 3-1).
An individual manila folder
is maintained on each circuit passing through the particular technical
control facility.
An eight-character identifier known as the Command
Communications Service Designator (CCSD) shows the military department to
whom the service is being provided, the network to which the circuit
belongs, the type of service provided, and the circuit number.
DCA
publications carry a long list of letters and their assigned meanings as
used in the CCSD's.
The circuit conditioner should refer to those
publications for precise definitions. An example of a CCSD number is DUAC-
A12. When this number is dissected, it yields the following information.
D - This circuit is assigned to serve an agency in the Department of
Defense.
UA - These letters identify the circuit as common user.
C - It is a teletypewriter circuit having maximum speed of 100 WPM.
A12 - This is the circuit identifier that appears as a cross-
reference in the Telecommunications Service Order (TSO). The zero is
made thus () to avoid possible confusion with the letter O.
(a) The area DCA control office designates one technical control
center to completely coordinate and supervise a selected circuit from end to
end. The DCA also designates an identifying color for that control center
to be displayed on the top edge of each file folder in every technical
control center through which the circuit passes. Further, each such folder
is filed alphanumerically by the last four characters of the CCSD.
The
folder within the responsible
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