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Patent

Arrangement for subscriber circuits utilizing digital time division multiplex telecommunication installations and particularly for PCM local exchanges

Robert Dipl.-Ing. Lechner, +1 more
TLDR
In this paper, the analog circuit portions which are associated with a sub-group of a subscriber line and circuit for coding and decoding are combined into sub-modules such as printed circuit boards which are mounted on a common carrier plate at a spacing from the main portion of the plate so that the carrier plate forms the circuit carrier for the paths and components of the digital component of the circuits.
Abstract: 
Subscriber circuits used for connecting analog operated subscriber line to digital switching networks have analog circuit portions which are individually associated with the individual subscriber lines and also have circuits for coding and decoding signals. Digital control and interface circuits are commonly associated with a plurality of such subscriber circuits and in the present invention the analog circuit portions which are associated with a sub-group of a subscriber line and circuit for coding and decoding are combined into sub-modules such as printed circuit boards which are mounted on a common carrier plate at a spacing from the main portion of the plate so that the carrier plate forms the circuit carrier for the paths and components of the digital portion of the circuits.

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Patent

Pocket-portable radio code signal transmitter for automotive keyless entry system

Takahisa Tomoda, +3 more
TL;DR: In this article, a radio signal transmitter for use in an automotive keyless entry system, is resistant to damage even when subject bending stresses, and a substrate for a transmitter circuit is housed within the thin internal space of the housing.
Patent

Digital satellite exchange

Andre kaczerowski
TL;DR: In this article, a digital satellite exchange for connecting analog and digital subscriber lines comprises a digital control unit and subscriber line digital concentrators of at least one of the following types: local analog subscriber line type, remote analog/digital subscriber line types.
Patent

Signal matching apparatus for exchanging signals between an analog switching system and a digital switching system

Hyun-Soo Je
TL;DR: In this paper, a signal matching scheme for exchanging signals between a digital switching system and a two-wire long distance subscriber line signal switching system was proposed, where a first PCM equipment was used for converting a 4-wire E1 signal of the digital system into a 2-wire analog signal, and a second PCM device was used to connect the analog signal to the digital signal.
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Patent

Telecommunications network having multi-function spare network block

Bernard J. Pepping, +2 more
TL;DR: In this paper, a single spare network block is provided having a programmable identity and capable of functioning in the place of any of the primary blocks in the case of a malfunction in a primary block.
Patent

Analog-digital code converter in a digital telephone switching system

Akira Horiki
TL;DR: In this paper, an analog-digital code converter in a digital telephone switching system is disclosed, where when an analog voice signal from an analog line is applied to an analog per line unit it is sampled at a high rate and a high speed sampling digital code produced by ΔM-PCM modulation is converted to a low speed sampled digital code through a digital filter provided in a common unit for application to a time division digital speech path switch.
Patent

Station loop control arrangement for telephone switching system

John Francis O'Neill
TL;DR: In this article, an arrangement for controlling the d.c. state of a subscriber''s loop which has a port appearance in a time division switching network is disclosed, which allows the processor to reoperate the ringing relay in the subscriber's line circuit during an interval when the group of line circuits including that of the affected subscriber would not normally receive active ringing.
Patent

Subscriber line circuit

Weir Donald Adams, +1 more
TL;DR: In this article, a telephone subscriber line circuits and an all-electronic telephone exchange are described wherein Hall effect devices are incorporated to detect line looping, dialing and ring-trip.