Pattern injector

Details Pattern injector Pattern injector

1989-11-08

1991-12-10

Beausoliel, Robert W.

Excavating

371 151, 371 27, G06F 1100

Patent

active

050724479

ABSTRACT:
A pattern injector for testing stations in a data communications network and the physical link between them. The pattern injector replaces normal characters in a normal, unmodified stream with injection characters. The pattern injector includes a multiplexor that receives both a current normal character and the injection character as inputs and provides the injection character as its output upon receipt of a select signal. Selection logic responsive to mode selection inputs selectively provides the select signal to the multiplexor in response to the various programmable pattern injector modes. In the Off mode, no replacement of normal characters occurs. In the One-Shot mode, the n.sup.th normal character after detection of a preselected normal character in the unmodified stream is replaced with the injection character. In the Periodic mode, every n.sup.th normal character in the unmodified stream is replaced with the injection character. In the Continuous mode, all normal characters in the unmodified stream are replaced with the injection character.

REFERENCES:
patent: 4302843 (1981-11-01), Bauernfeind
patent: 4485467 (1984-11-01), Miles
patent: 4745603 (1988-05-01), Shedd
patent: 4775977 (1988-10-01), Dehara
patent: 4875209 (1989-10-01), Mathewes
patent: 4881229 (1989-11-01), Kaltbeitzel
Ross, Floyd E., "FDDI-an Overview", Digest of Papers, Computer Soc. Intl. Conf., Compcon '87, pp. 434-444.
FDDI Physical Layer Protocol (PHY) Sraft Proposed American National Standard, X3T9/85-39, Rev. 13, Aug. 22, 1986.
The SUPERNET.TM. Family for FDDI, Databook, Advanced Micro Devices, 1989.
SUPERNET.TM. for Fiber Distributed Data Interface, Articles, Advanced Micro Devices.

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