I got two possibilities . . .
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2 file types use the .tsc file extension. ... Printed circuit board design created by TINA, a CAD program from DesignSoft; saves a schematic of an electrical circuit and includes components such as transistors, resistors, and the connectors; used for storing designs.
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And :
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Extension of time for Telecom Testing and Security Certification (TTSC) within India in respect of License Amendment dated 31.05.2011 and subsequent license for security related concerns for expansion of Telecom Services in various zones of the country
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God luck, and let us know.
Poet.