Communication system for activating an optical display in a comm

Details Communication system for activating an optical display in a comm Communication system for activating an optical display in a comm

1990-09-12

1993-07-20

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379376, 379372, 379396, H04M 100

Patent

active

052300188

ABSTRACT:
A central clock unit has a ring generator for generating ringing signals and a DC voltage source for generating display signals. With the assistance of the central clock unit having a switching unit that is controlled by a central processor unit, either the ringing signals or display signals are transmitted to an analog communication terminal via a ring down line and a line connection unit. Within the line connection unit, a switch is controlled by a ringing-display procedure to generate the desired rhythm of the ringing or display signal. A read/write memory unit within an I/O device is divided into dedicated memory sections to eliminate any delays associated with the control of the ringing-display procedure. The dedicated memory sections are used to store information which is written to or read from the memory by the I/O device and the central processor unit.

REFERENCES:
patent: 4266101 (1981-05-01), Dunbar
patent: 4794638 (1988-12-01), Millet
patent: 4821314 (1989-04-01), Guyader et al.

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