3-4. Telecommunications Service Order. The TSO is basic to all operations
in a technical control center, including those performed by technical
controllers and circuit conditioners. It is the authorization to activate,
change, or deactivate circuits or trunks. It is also the authority to amend
previously issued TSO's and to effect administrative changes.
The TSO is
normally sent over the reporting teletypewriter circuit to all stations
supervised by the DCA control office.
In this way, all stations involved
with the circuit receive identical information.
The TSO is a lengthy
document that describes in great detail all activities regarding a
Each circuit or trunk action carries a separate TSO
The following is a sample TSO number: D91234A12-4.
TSO number is dissected, it yields the following information.
D - This TSO was issued by DCA headquarters.
9 - It was issued in 1969.
1234 - It was the 1,234th TSO issued by that office.
/ - The diagonal separates information groups.
A12 - The TSO pertains largely to CCSD circuit A12.
-4 - This TSO is the 4th action taken on circuit number A12.
b. Administrative information. Administrative information is required
to serve as a guideline in establishing the circuit. Included are important
items, such as the CCSD identification number, restoration priority, type of
action (start, change, or discontinue), and service date (day, time, month,
Also included are geographical locations, control office
identification, security equipment nomenclature, and service availability
(full period, on-call, etc). Further, the TSO cites approval authority and