Interface for in band SCPC supervisory and signalling system
First Claim
1. In band supervisory and signaling interface for a single channel per carrier communication system including at least a pair of geographically separated stations communicating through a single communication link including a single modulator-demodulator pair coupled through a remote relay comprising, at a one of said stations,a terminal for connection to a conventional telephone line,detecting means connected to said terminal for detecting on-hook or off-hook status of said line,timing means responsive to said detecting means for producing a timing signal at the termination of a timing period in which said line status remains on-hook,first means connected to said timing means and to said detecting means for producing a unique signal in response to said timing means indicative of line status,the output of said first means coupled to said modulator for transmission of said unique signal.
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Accused Products
Abstract
An in band single channel per carrier supervisory and signalling apparatus and method is disclosed for satellite communications. The apparatus includes a near supervisory interface located at a transmitting terminal, and a far supervisory interface located at a receiving terminal. The near supervisory interface responds to either dc or single tone conventional signalling on a sending telephone line and formats hook status and dial pulse transitions for in band transmission. The far supervisory interface responds to the messages, as formatted by the near supervisory interface and, re-formats the information thus communicated for the receiving telephone system.
20 Citations
23 Claims
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1. In band supervisory and signaling interface for a single channel per carrier communication system including at least a pair of geographically separated stations communicating through a single communication link including a single modulator-demodulator pair coupled through a remote relay comprising, at a one of said stations,
a terminal for connection to a conventional telephone line, detecting means connected to said terminal for detecting on-hook or off-hook status of said line, timing means responsive to said detecting means for producing a timing signal at the termination of a timing period in which said line status remains on-hook, first means connected to said timing means and to said detecting means for producing a unique signal in response to said timing means indicative of line status, the output of said first means coupled to said modulator for transmission of said unique signal.
Specification