Telephone switch center with control of individual devices

Details Telephone switch center with control of individual devices Telephone switch center with control of individual devices

1988-03-09

1989-06-06

Dwyer, James L.

Telephonic communications

Centralized switching system

379279, 379333, 371 3, H04M 300

Patent

active

048378100

ABSTRACT:
After connecting a device to the switching device through device-specific connect command and transmission of a start command as well as transmission back of a start command acknowledgement signal, the connect command is partially or slightly changed and transmitted again, whereupon the switching device transmits a stop command to the particular device. The stop command is responded to by the particular device with a stop command acknowledgement signal transmitted back only, if after established connection it has received a start command before a stop command. The activation error is recognized in that after output of the changed connect command and the stop command transmitted thereupon each time, a stop command acknowledgement signal arrives in the switching device.

REFERENCES:
patent: 4754480 (1988-06-01), Mattis et al.
"Telcom Report", 5 (1982), No. 4, pp. 262-266, Digital Concentrators in the EWSD Telephone Switching System, Frieser et al.

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