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T-1 Line Diagnostic Multiplexer

IP.com Disclosure Number: IPCOM000038451D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Hinson, RF: AUTHOR [+3]

Abstract

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.

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T-1 Line Diagnostic Multiplexer

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. When the multiplexer senses no traffic on the T-1 attachment's 24 channels, the multiplexer switches the T-1 input line to a spare attachment. This allows diagnostics to run without service interruption. The attachment which is due for diagnostic testing is the attachment with the longest elapsed time from the last test performed on it. By switching over this line, the attachment with diagnostics due is now free to perform online diagnostics, while the attachment which was handling the freed line is now handling the line with traffic. For optimum performance, a spare attachment should be available at all times to ensure uninterrupted service. This way all attachments can be tested periodically, by switching their traffic o...