Title: Apparatus utilizing a phantom circuit for connecting additional subscribers to a telecommunication system

Abstract: A subscriber line circuit for telecommunication systems in which additional message signals, e.g., video signals, can be transmitted is described. The line circuit is constituted by two balanced line pairs which, if necessary, can have line amplifiers interposed therein. A remote supply circuit for the amplifiers, constructed in the form of a phantom circuit, is used, and this phantom circuit is used, as well, as the transmission circuit for the additional message signals. A subscriber set for the additional message signals is connected to the phantom circuit. A feed to the latter subscriber set, as well as two way communication take place over the phantom circuit.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Guntersdorfer, Siegfried (Sauerlach, DT)

Application Number: 548671
Filing Date: 1975-02-10
Publication_date: 1976-08-17
Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DT)
Primary Class(es): 370/200 379/90.01
Other Classes:
US Patent Ref:

706318	Aug, 1902	Howell	179/15.
1374221	Apr, 1921	Osborne	179/15.
2089179	Aug, 1937	Black	179/170.
2208417	Jul, 1940	Gilbert	179/170.
2347505	Apr, 1944	Rhoads	179/15.

Other Refs: 2,163,284

Jun, 1973	DT.

Other References: Glossary of Communications, E. C. Smith c. 1971 p. 357 copy in AU232 Telephony Publishing, Corp. 53 West Jackson Blvd. Chicago, Ill., 60604.