TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas

12. Telephone Communication. (See Fig. 25.)
With the Test Set plugged into the line under test, and the telephone
handset connected by means of the Telephone Jack, speech may be established
with either the Controller or Way Station. The equipment (Controller)
can, if desired, be disconnected by operating equipment cut off key
(ECO). Conversely, the Way Station may be cut off by operating Line Cut
Off Key (LCO). The telephone circuit is connected by the telephone key
(TK).
To ring on the line operate Ringing Out Key (ROK). To ring the
Controller operate Ringing In Key (RIK).
Telephone and Ringing Circuit
Fig. 25.
The Test Set is supplied either for wall mounting, or as a portable set.
Of the two, we recommend the use of the wall mounting set wherever possible
since the permanently connected set is ready for immediate use, and furthermore the
staff at a particular location will become familiar with the use of the set and its
associated local line data.
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