| 5239581 |
Secret communication apparatus |
| Aug-24-1993 |
This secret communication apparatus used in an audio and data transmission system has scramble/descramble circuits formed of programmable logic means. A control circuit in the apparatus instructs the programmable... |
| 5191614 |
Secure communication system |
| Mar-2-1993 |
There is provided by this invention a secure fiber optic communication system based on the Sagnac interferometer having features that make the system intrusion resistant. The security of the system is... |
| 5182772 |
Method and apparatus for encoding, transmitting, receiving and de-coding information |
| Jan-26-1993 |
A clear language dictionary of items of information to be transmitted is provided for composing messages and is also electronically impressed in first memory elements of sending and receiving computers.... |
| 5163092 |
Parallel scrambler used in sonet data transmission |
| Nov-10-1992 |
A data scrambler circuit which adds the SONET polynomial 1+X.sup.6 +X.sup.7 to data in a parallel format to thereby reduce circuitry clock rates to one-eighth the line rate, which reduces power consumption... |
| 5150242 |
Integrated optical computing elements for processing and encryption functions employing non-linear organic polymers having photovoltaic and piezoelectric interfaces |
| Sep-22-1992 |
An integrated optical device consisting of a monolithic crystalline substrate, an optical waveguide channel having an input end-face and an output end-face formed on the substrate and extending longitudinally... |
| 5144669 |
Method of communicating digital signals and receiver for use with such method |
| Sep-1-1992 |
A receiver (2) for selectively extracting one of two or more time division multiplexed channels of digital signals, which channel has been scrambled before multiplexing using a predetermined digital sequence... |
| 5136641 |
Scrambled video digital transmission link |
| Aug-4-1992 |
A scrambled video digital transmission link comprising an amplitude modulator, a scrambler, an amplitude demodulator and frequency conversion apparatus for providing a scrambled video signal in a baseband... |
| 5063595 |
Optical communications network |
| Nov-5-1991 |
A passive, all optical communications network is provided in which a single optical source in a central station serves many outstations (e.g., telephones in customers' premises). Time division multiplexed... |
| 4980913 |
Security system network |
| Dec-25-1990 |
The present invention uniquely applies data communications network techniques to a security system. A series of slave transponders are coupled via a full duplex bus to a master node. The master node is... |
| 4977593 |
Optical communications network |
| Dec-11-1990 |
A passive, all optical communications network is provided in which a single optical source in a central station serves many outstations (e.g. telephones in customers' premises). Time division multiplexed... |
| 4965881 |
Linear feedback shift registers for data scrambling |
| Oct-23-1990 |
A linear feedback shift register for use as a SONET data scrambler, operating in accordance with a generating polynomial of order n corresponding to an n by n transition matrix T, comprises k storage cells,... |
| 4961221 |
Communication method and system with encryption of information |
| Oct-2-1990 |
An information encryption method particularly intended for a communication system in which bidirectional multiplexed communications of the point-to-multipoint type are derived between a switching exchange... |
| 4959862 |
Active multichannel video processing hub for optimum transition from fiber to coax |
| Sep-25-1990 |
An active multichannel video processing hub which provides optinum transition from fiber to coaxial cable, provides optimum trading of bandwidth for signal to noise ratio. Fiber optic links have a very... |
| 4451916 |
Repeatered, multi-channel fiber optic communication network having fault isolation system |
| May-29-1984 |
A repeatered, multichannel fiber optic communication network includes a plurality of full duplex fiber optic channels and one or more auxiliary channels. In order to supervise and control the operation... |
| 4449247 |
Local orderwire facility for fiber optic communication system |
| May-15-1984 |
An orderwire communication scheme for a fiber optic communication network includes terminal station equipment associated with the central offices at opposite ends of the network and signal regenerator... |
