Richard W Peck

US Patent:

40103234, Mar 1, 1977

Filed:

Oct 29, 1975

Appl. No.:

5/626658

Inventors:

Richard John Peck - Eatontown NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H04L 700
H04L 2722

US Classification:

178 88

Abstract:

Sample timing recovery in a differentially coherent phase-shift keyed data transmission system is accomplished through the use of digital techniques. Samples of received phase-modulated signal waves taken at a rate high with respect to the carrier frequency are applied to a delay medium advantageously implemented by a shift register. Stored samples spaced by known carrier phase differences are compared for the purpose of detecting phase changes. Digital indications of such phase changes resulting from differentiation of comparator outputs are then effective to control a phase-locked oscillator and provide a substantially jitter-free timing recovery wave without using excess bandwidth for the transmitted wave.

US Patent:

40499090, Sep 20, 1977

Filed:

Oct 29, 1975

Appl. No.:

5/626657

Inventors:

Richard John Peck - Eatontown NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H04L 2724

US Classification:

178 67

Abstract:

A modulator for differentially encoded phase-shift keyed digital data is implemented entirely by digital means. Baseband serial binary data are illustratively transformed into dibit pairs which are assigned discrete quaternary carrier-wave phase shifts. A "staircasing" shift register whose weighted outputs are combined to form a quantized phase-modulated carrier wave is advanced by a relatively high-speed counter through a frequency divider network. The division rate of the divider is selectively accelerated in each baud interval in accordance with the assigned dibit coding. The resultant quantized carrier wave is then lowpass filtered prior to application to a telephone transmission line. By controlling the division rate of the divider rather than the advancement rate of the shift register, gradual transitions are imparted to the output carrier wave with minimal harmonic distortion.

US Patent:

54426243, Aug 15, 1995

Filed:

Oct 29, 1993

Appl. No.:

8/145426

Inventors:

Flavio G. Bonomi - Rumson NJ
Richard J. Peck - Jackson NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

H04J 322

US Classification:

370 17

Abstract:

A facility is provided in an ATM network to track whether data traffic from a source is being admitted into the network in accord with associated traffic parameters, which control such admission and dynamically change based on the level of congestion along an associated connection carrying such data. Such level of congestion is determined by launching a particular type of cell over the connection and waiting to see if the destination point of the connection and intermediate points thereof return the cell to the sender, thereby indicating that the route of the connection is not congested. If the cell is not returned, then the facility concludes that the route is congested.

US Patent:

40484408, Sep 13, 1977

Filed:

Nov 8, 1976

Appl. No.:

5/739803

Inventors:

Richard John Peck - Eatontown NJ
Shih Yung Tong - Holmdel NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H04L 700

US Classification:

178 691

Abstract:

Asynchronous character-oriented (start-stop) data are transmitted through a synchronous transmission channel at a rate which can exceed the synchronous rate. The excess data rate is accomplished in an input buffer at the transmitter by suppressing occasional stop bits in proportion to the difference between synchronous and asynchronous rates. An output buffer at the receiver detects start bits and thereafter monitors the presence or absence of stop bits. When a stop bit is absent, the output buffer restores it before delivering the character to the data user. Special control signals not organized into characters, such as, all-space signals are also monitored at both transmitter and receiver to insure that stop bits are not spuriously inserted.