Serial Channel Extender Link With SELECT in and SELECT OUT Control Lines Configured for Assigning a Selected PRIORITY Sequence Position to the Serial Link
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
A serial channel extender has a bidirectional serial link and a component at one end of the link called the X box and a component at the other end of the link called the Y box. The X box is connected to the parallel bus like a control unit, and several conventional control units can also be connected to this part of the parallel bus. An extension of the parallel bus is connected to the Y box, and several control units are connected to the box extension. See IBM Technical Disclosure Bulletin 19, 3139-3143 (January 1977). The conventional parallel bus includes a pair of lines called Select Out and Select In that are connected to the control units in a (Image Omitted) way that establishes a priority sequence among the control units.