Harry E. Petrie; W. M. Roberts

Abstract: This manual describes services provided by the Telecommunication Services Center to support operation of high-frequency ionospheric communications systems. The communicator obtains services he requires by a TTY terminal in his facility. Use of a dedicated circuit TTY is described. Use of a non-dedicated circuit TTY is described in the appendix.

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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