Specifications of signalling systems Nos. 4 and 5 : recommendations Q.120 - Q.180 / International Telecommunication Union

PLENARY ASSEMBLY, IX, Melbourne, 1988; UIT

Geneva: ITU, 1989

VIII, 112 p. ; 30 cm

Blue Book. Fasc. VI.2; Vol. VI

92-61-03461-6

Vária

Sistema-de-Sinalização

1989

Material Textual Impresso

ENG