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Local Area Network Analyzer Disclosure Number: IPCOM000103818D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 4 page(s) / 81K

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Disclosed is a device which captures and analyzes frames on a LAN, such as a Token Ring network.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Local Area Network Analyzer

      Disclosed is a device which captures and analyzes frames on a
LAN, such as a Token Ring network.

      As shown in the figure, the device includes a PC with a custom
LAN Adapter 10 attaching the PC to the LAN.  The adapter includes a
module (PM1, microcode) for performing an add time stamp function, a
measure frame length function, and measure LAN utilization function.
Module PM*1 packages each frame into a number of common fields (i.e.,
standardized frame), which are forwarded to PM2 for processing,
compiling and storing on PM3.  The custom LAN adapter provides the
following functions:

1.  Standard LAN protocols to allow attachment to the LAN without
    disruption or loss of line availability.

2.  A time stamp for each received frame at the time the frame first
    enters the adapter from the LAN.

3.  Execution of appropriate portions of the real-time data reduction
    program in the personal computer machine language, or a machine
    language particular to the adapter.

4.  Measurement of LAN utilization with minimal interference with the
    execution of the adapter's portion of the real-time data
    reduction program.

          The real-time data reduction program consists of the
    following program modules and support programs:

1.  A standard multi-tasking operating system for personal computer.

    The operating system must be able to provide time-slices of
    outprocessing to allow three simultaneous activities, namely:  a)
    receiving frames from the custom LAN adapter and executing
    analysis modules PM1 and PM2;  b) writing to the personal
    computer DASD (if required by the particular analysis); and c)
    accommunicating over the standard LAN adapter to a remote
    management station.

2.  A standard full screen editor.

    The editor must allow the user to easily modify a copy of the
    ASCII master source code, and write and output file under a
    different name for subsequent processing by the interpreter...