Method and system for selectively accessing multiplexed data tra

Details Method and system for selectively accessing multiplexed data tra Method and system for selectively accessing multiplexed data tra

1976-06-09

1977-11-22

Robinson, Thomas A.

H04J 314

Patent

active

040597296

ABSTRACT:
A method and system for accessing data in a time division multiplex communication network at the multiplexed level without disturbing the transmission of the data. A multiplexed data stream containing a predetermined pattern of framing signals and subscriber data from a plurality of subscriber channels is accessed directly by line accessing means located in the transmission path of the data stream. The line accessing means does not disturb the transmission of the multiplexed data stream, i.e., allows the multiplexed data stream to pass through the line accessing means, but provides a monitored data signal having the same data content as the multiplexed data stream, thereby essentially providing undisturbed direct access to the multiplexed data stream. A control signal designating one of the plurality of subscriber channels as the desired subscriber channel is generated, and framing signals in the multiplexed data stream are detected. The detected framing signals and the generated control signal are utilized to locate the designated one of the plurality of subscriber channels in the monitored multiplexed data stream for monitoring, testing or for use of the data contained in the located channel. Specifically, the located one of the plurality of subscriber channels is monitored so its data framing and content can be observed. For testing purposes, various codes such as a loopback code or a multipoint junction code may be inserted in the designated one of the plurality of subscriber channels in the multiplexed data stream without demultiplexing the data stream or otherwise disturbing the transmission of the stream. In this manner, loopbacks at various points in the system can be effected and test codes such as a pseudo-random code may be transmitted through the loopback and monitored for errors.

REFERENCES:
patent: 3796834 (1974-03-01), Kuhar, Jr.
patent: 3798635 (1974-03-01), Candiani
patent: 3920920 (1975-11-01), Lager et al.

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