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Pin and socket connectors
29
Model 6276 User Guide
3 • System architecture
Rear-panel I/O transition boards may have active components in some applications. Power can be applied
either through the I/O pins from the front board, or from the normal power and ground pins defined as part of
the J1/P1 and J2/P2 connector pin assignments.
Pin and socket connectors
The connection between boards and backplane is through a two-piece, 2 mm connector. Backplanes use male
(pin) connectors and plug-in boards use female (socket) connectors. This pin and socket connector offers
greater reliability, particularly when subject to shock, vibration, or temperature variations.
These pin and socket connectors provide:
•
Faster propagation times
•
Reduced reflection at the bus/connector interface
•
Lower noise
•
Better impedance matching
•
Higher mechanical stability
The connector is a 235-pin device, arranged in 47 rows of 5 pins, with a total of 220 pins (15 pins are lost to
the keying area). The connector is shielded and devotes a large number of pins to ground. This reduces reflec-
tions, increases EMI immunity in noisy environments, and reduces ground bounce.
The fixed or male connector on the backplane is numbered P1-P5, starting at the bottom. The corresponding
female connectors are also numbered from the bottom up as follows:
•
6U cards—J1-J5 (see
figure 11
)
Figure 11. J1 through J5 connectors on the 6U card