PCM pseudo code signalling user interface

Details PCM pseudo code signalling user interface PCM pseudo code signalling user interface

1992-12-09

1995-02-14

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 15, 3701101, H04J 302, H04L 1242

Patent

active

053901835

ABSTRACT:
A controllable physical connection management (PCM) pseudo code user interface is disclosed for use in the physical layer controller of a station or concentrator that is capable of insertion into a data transmission network that is capable of operating 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 the Next state after the transmission of any pseudo code signalling bit. In another aspect of the invention, the interface permits a user to load a hardware register with the pseudo code signalling information to be transmitted before the signalling begins. However, Complete control of the pseudo code signalling is retained by the user during the signalling process to permit midstream changes in the pseudo code sequence to protect against communications with unexpected neighboring port configurations and to permit custom pseudo code signalling sequences.

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

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