Multiplex communications – Wide area network – Packet switching
Patent
1989-10-30
1993-02-09
Richardson, Robert L.
Multiplex communications
Wide area network
Packet switching
370 941, 395275, G06F 1300
Patent
active
051858622
ABSTRACT:
An outbound frame state machine (OFSM) which generates data frames for transmission over a data link. The OFSM is microcode controlled and includes an outbound frame header buffer for containing information to be included in the header of the frame, a data buffer for storing data characters to be included in the data frame, a data generator register for providing special sequences of data characters, if required, and an outbound frame trace buffer for storing a trace log of all frames transmitted in the normal mode and to be used if the OFSM is operating in the simulated I/O mode or the diagnostic mode. In the normal mode of operation, the OFSM builds a data frame using header information from the frame heater bufferm and may include data from the data buffer, all as specified by control bits stored in a control register. The control register may also include a bit for causing special sequences to be transmitted. In the simulation mode, frames are built by the OFSM and then wrapped back to the channel to be processed like frames from a control unit. In the diagnostic mode, the OFSM inserts various characters into the outbound data bit stream to create possible error situations on the data link.
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patent: 4006465 (1977-02-01), Cross et al.
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patent: 4284953 (1981-08-01), Hepworth et al.
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Casper Daniel F.
Flanagan John R.
Gregg Thomas A.
Kalos Matthew J.
Liencres Bjorn O.
Gonzalez Floyd A.
International Business Machines Corp.
Richardson Robert L.
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