Telegraphy – Systems – Automatic
Patent
1983-02-15
1985-02-05
Schreyer, Stafford D.
Telegraphy
Systems
Automatic
H04L 1308
Patent
active
044979762
ABSTRACT:
Additional information is transmitted, in conjunction with message signals which are transmitted over a data switching center belonging to a public switched network. The data switching center is connected to teleprinter subscriber stations and teletex subscriber stations which are capable of transmitting and receiving message signals in accordance with different transmission procedures. The transmission of message signals between the subscriber stations occurs over at least one signal converter connected to the data switching center. After an occupation of the signal converter proceeding from a teleprinter subscriber station, the corresponding digital information are deposited in a memory of the signal converter by the data switching center upon each attempt to establish a connection from the signal converter to a teletex subscriber station. Under certain conditions, together with the message signal transmitted by the teleprinter subscriber station and contained in the signal converter, the additional information are emitted from the memory to the teletex subscriber station after a successful completion of a connection between the signal converter and the teletex subscriber station.
REFERENCES:
patent: 4323728 (1982-04-01), Bergman et al.
Franz Dietmar
Torggler Norbert
Schreyer Stafford D.
Siemens Aktiengesellschaft
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