Circuit arrangement for communication facilities wherein transmi

Details Circuit arrangement for communication facilities wherein transmi Circuit arrangement for communication facilities wherein transmi

1974-04-18

1977-02-22

Brown, Thomas W.

Telegraphy

Systems

Printing

178 41B, H04M 1100

Patent

active

040093425

ABSTRACT:
Apparatus is described for telecommunication facilities having transmission paths capable of accommodating different types of message switching, e.g., voice communications and data communications. A changeover device in the subscriber stations in the system switches between the two modes of communication by means of a mode selector switch for causing manual or automatic switching between the two forms of communication. After switching through a call carried by a given connector set, a signal is automatically sent from the connector set to the called subscriber station. This signal causes an automatic changeover from the form of message communication being used to a second form, e.g., from voice to data. Upon completion of the changeover in the called subscriber station, acknowledgement of this fact is made by sending a back signal from the called station. Responsive to this acknowledgement, a signal is likewise sent to the calling subscriber station. This signal automatically effects a changeover in the calling station to the desired mode of message transmission, and this changeover is likewise acknowledged by a back signal. The changeover is reported to both subscriber stations participating in a call as an inquiry for acceptance of the desired message switching.

REFERENCES:
patent: 3475557 (1969-10-01), Morse et al.

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