Controllable PCM state machine user interface

Details Controllable PCM state machine user interface Controllable PCM state machine user interface

1992-12-09

1994-06-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 8515, H04L 1242

Patent

active

053253604

ABSTRACT:
A controllable physical connection management (PCM) state machine user interface is described for use in the physical layer controller of a station or concentrator capable of insertion into a data transmission network that operates substantially in accordance with the FDDI protocol. In one aspect of the invention, the interface permits the user to direct the PCM state machine to pause after entering a particular state during the initial connection management sequence. In another aspect of the invention, the interface permits a user to force a state transition by writing the desired new state into a state register. These user interface features allow the state transitions to be controlled by the user and therefore possibly changed. In a preferred embodiment, the user initiated state transition can occur while the PCM state machine is paused.

REFERENCES:
patent: 5031174 (1991-07-01), Natsume
patent: 5046182 (1991-09-01), Hamstra et al.
patent: 5182747 (1993-01-01), Frenzel, III et al.
Excerpt from an Advanced Micro Devices Databook.
MC68837-FDDI Elasticity Buffer and Link Manager Preliminary Specification.

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