Apparatus for generating an exchange pulse train for use in a te

Details Apparatus for generating an exchange pulse train for use in a te Apparatus for generating an exchange pulse train for use in a te

1980-02-12

1982-05-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 16, 375108, 328155, H04J 306

Patent

active

043308546

ABSTRACT:
In order to provide the possibility of interchange of roles of leading and led exchange pulse train generators, an exchange pulse train (T") of the led generator is synchronized in phase with that (T') of a leading generator. Each generator derives its exchange pulse train (T', T") from a respective intermediate pulse train (H', H") by means of a frequency reduction arrangement (BKP, U). Comparison in the led generator (UGN, BKN, UGV, BKV, BKVv) of the exchange pulse trains detects a relative phase lead or lag greater than a given threshold value of the same order as the intermediate pulse train period and, in order to maintain in-phase synchronism, shortens or lengthens (BKR), as appropriate, a half period signal portion of the exchange pulse train by an intermediate pulse train period. The intermediate pulse generator is servo-synchronized by means of a master pulse train derived in a frequency adjuster from a received standard pulse train.

REFERENCES:
patent: 3803568 (1974-04-01), Higashide
patent: 3974333 (1976-08-01), May et al.
Principles of Color Television, by Hazeltine Lab Staff, New York, 1956, pp. 170-191.
"Rechteckgenerator Mit Digital Einstellbarer Frequenz", by Grosskopf et al, Elektronik Magazine, vol. 8, (1973), pp. 285-287.
"Automatische Frequenznachstellung in Plesiochronen Analogen und Digitalen Fernmeldenetzen", by Schott, Tekade Techn. Mitt., (1978), pp. 24-28.

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