Telephonic communications – Special services – Call waiting
Patent
1986-01-27
1988-05-10
Dwyer, James L.
Telephonic communications
Special services
Call waiting
379277, H04M 342
Patent
active
047441020
ABSTRACT:
An arrangement for improved two-line hunting in crossbar switching systems is disclosed where the two lines are located in the same line link frame vertical group and vertical file. When the marker determines that the primary line is busy the marker is caused to recycle and to reseize the number group and retranslate the directory number of the primary appearance. When the marker re-obtains the equipment location information for the primary line appearance, it directly modifies one element of the translation information, illustratively, the horizontal group number, to obtain the equipment location of the auxiliary line appearance. Since the marker directly modifies the translation information furnished by the number group it is not necessary to assign a separate directory number to the auxiliary line appearance. The direct modification of the equipment location is performed by providing a selectively operable chain path in the operating path of the horizontal group seizure relays.
REFERENCES:
patent: 2585904 (1952-09-01), Busch
patent: 3133995 (1964-05-01), Zarouni
patent: 3278692 (1966-10-01), Bean
patent: 3320367 (1967-05-01), Krom
patent: 3479465 (1969-11-01), Masucci
patent: 3532831 (1970-10-01), Whitney
Bell Laboratories record, Jul. 1950, p. 298 "Number Group Frame for No. 5 Crossbar" by O. J. Morzenti.
Electrical Engineering, Aug. 1950, p. 679, "No. 5 Crossbar" by F. A. Korn and J. G. Ferguson.
Bell Laboratories Record, Nov. 1950, p. 502, "No. 5 Crossbar Marker" by A. O. Adam.
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