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US 4,286,119 AGranted
Arrangement for concentrating pulse code modulation processing circuits in a digital telephone office
AssigneeGTE Automatic Electric Labs Inc.
InventorsDavid J. Stelte, Alex W. Kobylar
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Abstract
Pulse Code Modulation (PCM) line circuits include analog and PCM processing circuitry. These circuits are separated into an analog line circuit portion and a PCM processing circuit portion. An analog network is connected to the analog line circuits and provides concentration to a minimal number of PCM processing circuits.
Claims11
An arrangement for concentrating pulse code modulation processing circuitry in a digital switching system, including a plurality of subscriber stations each operated to generate off-hook signals, said arrangement comprising:
- a plurality of line supervisory means each connected to an associated one of said subscriber stations, each operated in response to said off-hook signal to generate a supervisory signal;
- a processing unit connected to said plurality of line supervisory means, operated in response to said plurality of supervisory signals to generate a plurality of supervisory enable signals and a plurality of modulation enable signals;
- connection means connected to said plurality of line supervisory means;
- a plurality of pulse code modulation means connected to said processing unit, each operated in response to an associated one of said modulation enable signals to connect to said connection means;
- each of said plurality of line supervisory means further operated in response to an associated one of said supervisory enable signals to connect to said connection means;
- and
- said connection means operated in response to connection of said line supervisory means and said pulse code modulation means to connect said line supervisory means to said pulse code modulation means.
4 more elements
Dependencies are inferred from the claim text.