Sphere Communications, Inc.

Teradyne, Inc.

Alan T Weir

Ernst B Riemann

Randall Vyskocil

David F Niesman

M A Kergozou

Scott D Jezwinski

Jeffrey H Schy

A distributed private branch telephone exchange (PBX) including a local area network carrying telephony traffic, an interface to the PSTN and a station interface connecting to a telephone device transmitting telephony over the local area network. The distributed PBX may contain a number of multi-port modules connected over a local area data network. The multi-port modules convert between synchronous and asynchronous signals and connect between a telephony environment, such as a telephone device, a local area network, and a personal computing device. The distributed PBX also includes PBX software and a graphical user interface (GUI) which facilitate the management of various PBX functions.

LAN telephone system

ATM LAN telephone system

In a method and apparatus for scanning a fiber optic network, a light source emits optical pulses into an optical fiber under test. A detector detects reflected light for each of the optical pulses and converts the reflected light into an electrical signal for each of the optical pulses. A sampling circuit samples the electrical signal for each of the optical pulses to generate sets of sample data points associated with the respective optical pulses. A signal processor is programmed to ensemble average the sets of sample points with each other to generate a merged set of avenge sample points. The signal processor then compresses the merged set of average sample data points to obtain a current set of trace data points. The data compression is preferably accomplished using 'boxcar' time-avenging of the sample points. The current set of trace data points is compared with a reference set of trace data points stored in memory to determine whether or not a fault exists in the fiber under test.

Method and apparatus for scanning a fiber optic network

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Gurnee, IL, United States of America

Alan T Weir