Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-10-30
1991-09-10
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
3701054, H04L 700
Patent
active
050480626
ABSTRACT:
An apparatus and method for transmitting commands over a serial link having a switch intermediate a channel and a control unit wherein continuous sequences of idle characters (K.28.5) are sent over the link for maintaining character synchronization. Commands and response information is sent between ports of the switch and the channel and/or the control unit by modifying every other idle character to a modified idle character to which a command or response function has been assigned. In the modification, a selected number of the bits of the idle character are held invariant, and only those bits are varied which form data characters according to the rules of the 8B/10B encoding method. Code points for a total of 124 modified idle characters are disclosed to which a separate command or response may be assigned.
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Gregg Thomas A.
Skarshinski Leon
Chin Stephen
Gonzalez Floyd A.
International Business Machines Corp.
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