General DataComm Xedge 6000 Series Hardware Installation page 82

Switch Fabric and V6.2 Controllers
Table 3-4
XH/XS Switch Fabric Jumper Settings
Jumper
JP1
Table 3-5
(See )
JP2
JP3
(See Table 3-5 )
JP4
Table 3-5
(See )
Table 3-5
Setting Jumpers for XH/XP Mode
For XP Mode at 25 MHz
For XH Mode at 50 MHz
Special Considerations
• Setting Priority Mode (J2)
For normal operation, set JP2 to the upper position (High Mode) to ensure the high priority cells
are always sent before low priority cells. Be aware that if most of the traffic is high priority, the
low priority cells may never get delivered because there will always be high priority cells to
process. In this situation, set JP2 to the lower position (High/Low Mode) to ensure that cells in
both queues are processed alternately.
• Setting XH/XP Mode
Jumpers JP1, JP3 and JP4 are codependent. As shown in
operation) or 25 MHz with XP (XP emulation).
3-10
Position Setting Description
Upper 25 MHz Required for 25 MHz operation (XP emulation)
Lower 50 MHz Required for 50 MHz operation (Normal operation)
Upper High High priority cells have preference over low priority cells. Cells
Mode in the low priority queue are only sent when the high priority
queue is empty. (Normal operation)
Lower High/Low Low priority cells and high priority cells are equal.
Mode Both queues are examined alternately.
Upper XP Mode Sets fabric for XP emulation (25 MHz)
Lower XH Mode Sets fabric for XH operation (Normal)
Upper 50 MHz Required for 50 MHz operation (XH mode)
Lower 25 MHz Required for 25 MHz operation (XP emulation)
JP1 Position
Upper
Lower
Xedge 6000 Hardware
Installation & Setup Guide
Switch Fabric Setup
JP2 Position JP3 Position
Either position Upper
(See Table 3-4 )
Lower
, set 50 MHz with XH (normal
Table 3-5
JP4 Position
Lower
Upper
032R440-000
Issue 17