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Upgrades Using B4166 and B4168 CPUs B-11
B.4 B4168 Compatibility Switch
The B4168 CPU module has a switch that must be set if the module is
to be used with B4125 modules in the same QBB.
Figure B– 4 Setting the B4168 Switch
CPU Chip
Power
Converter
MR0489
S1 Switch
For use with B4168 or B4166 CPUs
For use with B4125 CPUs
Figure B–4 shows the location of the S1 switch that must be changed if the
module is to be in a QBB with a B4125 module.
As viewed here, the switch would be set to the left for 1224/1001 MHz speeds;
this is the default position. When set to the right, the switch allows the module
to operate with a B4125 module running at 731 MHz.