Patent
1975-10-29
1977-03-22
Brown, Thomas W.
H04Q 130
Patent
active
040138437
ABSTRACT:
A marker designed to control a switching circuit for extending an outgoing call to a remote junction, identified by a characteristic digit or digit combination at the beginning of a call number emitted by a local subscriber, includes a first and a second memory connected in tandem via an intervening decoder, the first memory having respective cells addressable by all possible digits and digit combinations forming part of the characteristic call-number portion. The code words stored in these cells are translated by the decoder into (a) a signal ni indicating a nonexisting junction, (b) a signal ci denoting an incomplete characteristic, or (c) a signal if addressing a cell of the second memory to select a transmission path leading to a fully identified junction. The signal ci, when generated, is fed back to a translator in the input of the first memory together with the code word stored in the cell last addressed therein, this code word being then added to the next digit arriving at the translator whereby another cell in that memory is identified, and so on until a complete characteristic is received.
REFERENCES:
patent: 3316355 (1967-04-01), Hanna et al.
patent: 3671677 (1972-06-01), Lee, Jr. et al.
patent: 3736383 (1973-05-01), Le Baron
patent: 3931476 (1976-01-01), Matthews
Lupattelli Carlo
Miotti Alfredo
Brown Thomas W.
Dubno Herbert
Ross Karl F.
Societa Italiana Telecomunicazioni Siemens S.p.A.
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