Communications: electrical – Continuously variable indicating – With meter reading
Patent
1988-04-11
1989-08-29
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
With meter reading
370 86, 375107, H04Q 100
Patent
active
048621587
ABSTRACT:
A ring communication system comprises distribution panels (13) for inserting extension lines (15) and attached stations (19) into the communication ring (11); insertion is requested and controlled by DC signaling from the station via a phantom path. To allow attachment of several stations via additional extension lines (25) to a single basic extension line (15), extension distribution panels (23) are provided comprising line insertion modules (31) like the basic distribution panels. Insertion of a station and its additional extension line (25) up to the EXP is still controlled by DC signaling from the station, but insertion of the basic extension line (15) is controlled by a tone signal transferred from the EXP to the basic distribution panel via a phantom path. The EXP (23) needs no own power supply because DC power is provided from the basic distribution panel (13) via the phantom circuit of the basic extension line.
REFERENCES:
patent: 4173714 (1979-11-01), Bloch et al.
patent: 4293948 (1981-10-01), Soderblom
patent: 4417242 (1983-11-01), Bapst et al.
Keller Heinz J.
Mueller Johann R.
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