IBM3229P2035
IBM Packet Routing Switch Serial Interface Converter
Advance
Figure 15: Path Selection
Switch_X_inService
SOP/DATA from X path
SOP/DATA from Y path
SOP/DATA from
Path Selection
Switch_Y_inService
-X_inService
-Y_inService
True
False
True
True
True
False
False
False
Status of the selector
Path X is selected
Path Y is selected
No path selected
No path selected
The attached microprocessor polls those bits to check the validity of the path selection.
Force path selection
0
1
0
1
1
Select X/Y
0 select X path
1 select Y path
Don’t care
X_/Y_inService is valid
Selection based on physical
wires
Status of the selector
Path X is selected
Path Y is selected
Use this scheme to force any path with the force bit to perform a switch-over at switch core level and to verify
that the X_/Y_inService lines operate properly.
Functional Description
Page 36 of 154
prssi.02.fm
March 1, 2001
IBM [ IBM ]
