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T-1 Line Diagnostic Multiplexer Disclosure Number: IPCOM000038451D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31

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Hinson, RF Millas, RJ Ortega, OE [+details]


This article describes a technique which provides on-line diagnostic testing capabilities on T-1 carrier line attachments without interrupting the T-1 line for a considerable amount of time. A problem encountered in the diagnostic servicing of T-1 carrier lines is that 24 communication channels are time division multiplexed onto one line, and any interruption to the line affects all 24 channels on the T-1 line. Disclosed herein is a method by which a line diagnostic multiplexer is used to switch a T-1 line connected to a series of T-1 attachments through the multiplexer, as shown in the drawing. When a T-1 attachment is due for diagnostic testing, the host processor issues a diagnostic command to the multiplexer.