Collective-house control system employing an interface circuit f

Details Collective-house control system employing an interface circuit f Collective-house control system employing an interface circuit f

1996-06-07

1998-05-05

Chan, Wing F.

Telephonic communications

Multi-line or key substation system with selective switching...

With intercom system

379167, 379 9305, 370529, 34082504, 348 13, 455 61, H04M 160, H04J 300, H04N 714

Patent

active

057487227

ABSTRACT:
A collective-house control system is provided which employs an interface circuit for alternative mark inversion (AMI) communication. The interface circuit has a data detecting unit, a controlling unit, and an AMI signal generating unit. The data detecting unit receives input AMI signals from a single coaxial line and detects first control data within the input AMI signal. The controlling unit receives the first control data and generates a corresponding output signal. Also, controlling unit inputs second control data and generates first and second signals for generating an output AMI signal. The AMI signal generating unit inputs the first and second signals and generates the output AMI signal in accordance with such signals. The interface circuit may also include a collision detecting unit and a logic circuit unit. The collision detecting unit detects a collision between the first control data and detected control data and outputs a collision detecting signal if the collision is detected for certain period of time. The logic circuit unit masks the first and second signals output from the controlling unit in response to the collision detecting signal. Also, the logic circuit unit generates the detected control data based on the first and second signals output from the controlling unit and outputs such data to the collision detecting unit.

REFERENCES:
patent: 4952070 (1990-08-01), Leedke et al.
patent: 4959713 (1990-09-01), Morotomi et al.
patent: 5125026 (1992-06-01), Holcombe
patent: 5398249 (1995-03-01), Chen et al.

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