Patton electronics ForeFront 6676, Руководство пользователя

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Introduction 19
Model 6676 6U CPCI Chassis Assembly User Guide 1 • Introduction
There is an alignment/ESD pin on the injector/ejector handle of boards (see figure 7 ).
Figure 7. Alignment/ESD pin on card handle
The alignment pin does the following:
• Ensures that the connectors are correctly aligned before they engage
• Provides solid/protected keying
• Provides board ESD contact
• Ensures that the EMC gasket is properly aligned (see “Electromagnetic compatibility (EMC)” on page 17)
• Ensures that when the board is inserted in the card guide, an integrated ESD clip discharges ESD from the
board to the right vertical rail chassis ground.
Hot-swap capability
Hot-swapping is the capability of removing and replacing components without turning off the system. Hot-
swap capability is becoming increasingly important in systems requiring continuous operation at some level.
Because boot times of many popular operating systems are long, the hot-swap capability is crucial for high-end
PC servers, and even more so for telecommunication systems, such as base stations, where board-level
exchanges must be made without any downtime. CompactPCI supports dynamic configuration to allow hot
removal/insertion of boards without interrupting backplane transactions or disturbing DC voltages in the
power system.
The hot-swap feature is implemented on the cPCI boards, not on the backplane. The backplane remains pas-
sive. Therefore, CompactPCI boards either are or are not hot-swappable.
Card handle
Alignment/ESD pin